Dissertations / Theses on the topic 'Milk peptides'
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Wedholm, Anna. "Variation in milk protein composition and its importance for the quality of cheese milk /." Uppsala : Dept. of Food Science, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200813.pdf.
Full textEkeke, Nnenna Uloma. "Gastrointestinal hormonal responses to selective milk based diets." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317438.
Full textSipola, Marika. "Effects of milk products and milk protein-derived peptides on blood pressure and arterial function in rats." Helsinki : University of Helsinki, 2002. http://ethesis.helsinki.fi/julkaisut/laa/biola/vk/sipola/.
Full textThurgood, Andrew G. P. "NMR studies of the structure and dynamics of proteins and peptides." Thesis, University of East Anglia, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253623.
Full textAltmann, Karina [Verfasser]. "Generation, enrichment and characterization of bioactive oligosaccharides and peptides from milk / Karina Altmann." Bonn : Universitäts- und Landesbibliothek Bonn, 2016. http://d-nb.info/1103135198/34.
Full textAntonsson, Cecilia. "Mjölk, gluten och ADHD : En litteraturundersökning om mjölk och glutens påverkan hos barn med ADHD." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-31551.
Full textAttention Deficit Hyperactivity Disorder (ADHD) är en allt mer vanligt förekommande diagnos hos förskolebarn. Uppfattningen om att en anpassad kosthållning kan lindra symtomen hos barn med ADHD har växt sig starkare de senaste åren. Barn med ADHD lider ofta av en irriterad tarm som har en störd matspjälkningsfunktion, vilket kan leda till att näringsämnen bryts ner ofullständigt och resulterar i näringsbrister och frisättning av ämnen som kan påverka oss negativt.Syftet med rapporten är att sammanställa och belysa kunskapen om hur kosten kan påverka symtomen hos barn med ADHD, med särskild inriktning på påverkan från mjölkprotein och gluten. Samt att belysa vilken nytta skolverksamheten kan ha av dagens forskning inom ämnet.Rapporten är en sammanställning av de forskningsresultat som finns inom ämnet ADHD-anpassad kost där mjölkprotein och gluten utesluts.Majoriteten av barn med ADHD påvisar en minskade symtom om de får en anpassad kost utan mjölkprotein och gluten.Om förskolan skulle erbjuda barn med ADHD en anpassad kost är det realistiskt att anta att deras ADHD-symtom skulle kunna minska med ett ökat välbefinnande som följd.
Stefanutti, Erin. "ANGIOSTATIN LIKE PEPTIDES IN MILK: POTENTIAL DEVELOPMENT FOR DAIRY PRODUCTS CAPABLE OF CANCER PREVENTION." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/479.
Full textLiu, Yufang [Verfasser], and Monika [Gutachter] Pischetsrieder. "Identification and Quantification of Bioactive Peptides in Milk and Kefir / Yufang Liu ; Gutachter: Monika Pischetsrieder." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://nbn-resolving.de/urn:nbn:de:bvb:29-opus4-86084.
Full textLiu, Yufang Verfasser], and Monika [Gutachter] [Pischetsrieder. "Identification and Quantification of Bioactive Peptides in Milk and Kefir / Yufang Liu ; Gutachter: Monika Pischetsrieder." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1136473270/34.
Full textBillakanti, Jaganmohan. "Extraction of High-Value Minor Proteins from Milk." Thesis, University of Canterbury. Chemical and Process Engineering, 2009. http://hdl.handle.net/10092/3843.
Full textRouy, Emilien. "Activité de peptides issus d’hydrolysats de protéines de lait sur la physiologie des cellules osseuses." Thesis, Paris, AgroParisTech, 2013. http://www.theses.fr/2013AGPT0085.
Full textOsteoporosis is a disease mainly affecting women after menopause, characterized by a reduced bone mineralization and a deterioration of bone micro-architecture. The aim of this thesis is to identify a milk protein fraction able to stimulate bone formation. When added to a food product, this fraction could reduce bone loss. The first task of this project was to produce the milk protein fractions. Milk proteins (casein or whey proteins) were digested by enzymes and fractionated by filtration according to their molecular weight. The fractions obtained were then tested on primary cultures of bone cells. Some of the milk protein fractions tested were able to increase proliferation and differentiation of osteoblasts. Among these active fractions, the one obtained by digestion of casein by chymotrypsin followed by filtration through a 10 kDa filter have been selected to be tested on animals. This fraction is named CR10. To study the activity of CR10 in vivo, a protein-restricted mouse model has been developed. Our studies showed that a reduction of protein in the diet from 20% to 6% impaired bone formation when the diet was based on soy protein. When these protein-restricted mice ingested the CR10 fraction, no improvement of the BMD was reported, which means that the CR10 cannot exert its anabolic activity in vivo. However, if casein is given instead of soy or if PTH is injected to the mice, bone formation is increased. These results suggest that the CR10 is not a good candidate as an anabolic fraction. However, the positive effect of casein compared to soy could be exploited in future studies aimed at finding an osteoanabolic casein fraction
Wang, Shiping. "Peptides as amino acid sources for the synthesis of secreted proteins by mammary tissue explants and cultured mammary epithelial cells." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/39137.
Full textVilela, Regina Maria. "The influence of whey peptides and fenretinide on inflammation and apoptosis in immortalized wild type and mutant [delta]F508 CFTR human tracheal epithelial cells /." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102227.
Full textSales, Iana Rafaela Fernandes. "Avaliação in vitro do efeito imunomodulador do leite materno de camundongos infectados pelo Schistosoma mansoni." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16506.
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A alta prevalência de esquistossomose crônica em gestantes, bem como em mulheres em idade fértil, tem sido amplamente relatada. Esta condição materna é capaz de alterar a resposta imune do descendente em longo prazo. O presente estudo teve o objetivo de avaliar o efeito in vitro do leite materno de mães infectadas pelo Schistosoma mansoni em esplenócitos e caracterizar os peptídeos encontrados nesse leite. Para isso, camundongos fêmeas infectadas ou não, tiveram seu leite coletado no 12º dia após o parto. Os esplenócitos jovens (15 dias) e maduros (6 semanas) foram cultivados com o Leite de Mães Infectadas (LMI) e com Leite de Mães Não Infectadas (LMNI) na presença de estimulador policlonal. Além disso, foram utilizados controles experimentais: Células pulsadas na ausência (BASAL) e apenas com estimulador policlonal (MITÓGENO) e células cultivadas com LMNI adicionado de antígenos solúveis dos ovos do S.mansoni (LMNI+SEA). Posteriormente, os ensaios de citometria de fluxo foram realizados para dupla marcação: Linfócitos T (CD3+ ou CD4+) marcados com CD28, CD154, CTLA4, IL-10 ou FoxP3. Além disso, foram analisadas a expressão de CD80, CD86 e CD40 na superfície de Macrófagos (CD14) e Linfócitos B (CD45R), e ainda a expressão de IL-10 por esse último. Para a análise dos peptídeos presentes no leite materno, um gel unidimensional foi confeccionado e as bandas obtidas no LMI, LMNI+SEA e LMNI foram processados para análise por espectometria de massa. Além disso, foram realizadas análises de antígenos parasitários: SEA e SWAP (antígeno solúvel do verme adulto). Esplenócitos jovens pulsados apenas com o mitógeno apresentaram maior frequência de células CD3+CD28+ e CD45R+IL10+. A adição de LMNI manteve aumento CD3+CD28+ e levou a menor frequência de Tregs, com aumento na expressão de células CD45R+CD40+. Ao ser introduzido o SEA (LMNI+SEA) foi identificada uma menor frequência de células CD3+CD28+ e aumento na expressão de IL-10. O LMI proporcionou menor frequência de linfócitos CTLA4+ e FoxP3+, porém com produção de IL-10 e maior frequência de CD45R+/CD80+. Para os esplenócitos maduros, o LMNI e LMI levaram à menor frequência de células CD3+/CD28+ e maior CD3+/CTLA4+, respectivamente, com aumento sustentado de Treg. Contudo, o LMI diminui a presença de células B IL-10+. A adição do SEA ao LMNI manteve a diminuição de células CD3+CD28+, mas aumentou a frequência de células CD3+/CD154+. O leite de mães esquistossomóticas apresentou peptídeos relacionados à presença do S. mansoni e com variabilidade de função. Destacamos a natureza imunomodulatória dos peptídios aqui identificados (Interleucina 17F, Glutationa s Transferase) que podem atuar na imunidade, seja para antígenos do parasita ou heterólogos, no descendente previamente amamentado. Estes achados enfatizam o caráter dicotômico do leite materno: estimulador em células jovens e tolerogênico em células maduras. Esses achados são relevantes em áreas endêmicas para esquistossomose e reiteram a importância da identificação e caracterização de antígenos parasitários, bem como, uma avaliação do seu papel na interação parasito-hospedeiro no incio da vida.
The high prevalence of chronic schistosomiasis in pregnant women and women of childbearing age has been widely reported. Breastfeeding by mothers with schistosomiasis is capable of altering the long term immune response of offspring. The aim of this study was to undertake an in vitro analysis of the effect of breast milk of mothers with schistosomiasis on young and mature splenocytes and characterize the proteomics in this milk. The milk of female mice infected with Schistosoma mansoni and non-infected female mice was collected on the 12th day postpartum. Young (15 days) and mature (6 weeks) splenocytes were cultivated (24hs) with mitogen (CONTROL), added to the Milk of Infected Mothers (MIM), Milk of Non-Infected Mothers (MNIM) or Milk of Non-Infected Mothers with the addition of soluble egg antigens of parasites (MNIM+SEA), as well as those without in vitro stimulus (BASAL). Double cell labeling was performed for flow cytometry: T Lymphocytes (CD3+ or CD4+) marked with CD28, CD154, CTLA4, IL-10 or FoxP3; Macrophages (CD14) and B Lymphocytes (CD45R) marked with CD80, CD86 or CD40 on the surface and the expression of IL-10 by CD45R+ cells. For analysis of proteomics a one-dimensional gel was made and the bands obtained from MIM, MNIM, MNIM + SEA, were processed for analysis by mass spectrometry. Additionally, the parasite antigens SEA and SWAP (soluble adult worm antigen preparation) were included in the analysis. Young splenocytes pulsed only with mitogen had the greatest CD3+CD28+ and CD45R+IL10+ cell frequency. The addition of MNIM maintained an increase of CD3+CD28+ and produced the lowest frequency of Tregs, with an increase in the expression of CD45R+CD40+ cells. The introduction of SEA (MNIM+SEA) resulted in reduced CD3+CD28+ cell frequency and increased IL-10 expression. MIM resulted in reduced CTLA4+ and FoxP3+ lymphocyte frequency, although there was some IL-10 production and greater CD45R+/CD80+ frequency. MNIM and MIM resulted in the lowest frequency of CD3+/CD28+ and CD3+/CTLA4+ cell frequency, respectively, for mature splenocytes, with a sustained increase of Treg. However, MIM reduced the presence of B IL-10+ cells. The addition of SEA to MNIM maintained a reduction in CD3+CD28+ cells, but increased the frequency of CD3+/CD154+ cells. The breast milk of mothers with schistosomiasis presented peptides related to the presence of S. mansoni and variability of function. The immunomodulatory nature of the peptides identified in the present study (Interleukin 17F, Glutathione-S-Transferase) should be noted, as these can act in the immune process of breastfed offspring, whether for parasite antigens or heterologous antigens. These findings emphasized the dichotomous character of breast milk, which functions as a stimulator in young cells and is tolerogenic in mature cells, yet is capable of improving LB activation. These findings are relevant for areas in which schistosomiasis is endemic and emphasize the importance of the identification and characterization of parasite antigens and the evaluation of their role in parasite-host interaction in the early stages of life, in order to obtain a better understanding of immunoregulatory events.
Salles, Sara Salomão. "Prospecção in silico de novos peptídeos antimicrobianos a partir de fragmentos proteolíticos de leite bovino." Universidade Federal de Juiz de Fora, 2012. https://repositorio.ufjf.br/jspui/handle/ufjf/1723.
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A melhoria da qualidade da alimentação pode desempenhar efeitos fisiológicos benéficos e reduzir o risco a certas doenças. O leite contribui para a ingestão recomendada de nutrientes e promove a saúde através de seus componentes biologicamente ativos que a ele agregam inúmeras funcionalidades além da nutrição. A busca por novos antibióticos de amplo espectro de ação tem aumentado nas últimas décadas devido ao número crescente de bactérias resistentes aos antibióticos convencionais. Neste sentido, as proteínas do leite bovino, após fragmentação, podem ser promissoras fontes de peptídeos antimicrobianos (PAMs), que ficam inativos quando internalizados em uma sequência protéica maior e podem ser liberados a partir de enzimas digestivas durante o trânsito gastrointestinal. Neste trabalho, sequências protéicas provenientes do leite foram obtidas em banco de dados e sumariamente clivadas in silico por enzimas gastrointestinais (pepsina, tripsina e quimotripsina). Esta clivagem virtual disponibilizou inúmeros peptídeos que foram analisados e selecionados com relação a inúmeras características inerentes à AMPs, tais como tamanho, carga, composição, hidrofobicidade, momento hidrofóbico e estruturação. Cinco peptídeos (lactof01, lactof02, A_lacto01, serumA01 e serumA02) foram selecionados e tiveram sua estrutura tridimensional construída teoricamente por meio de modelagem molecular por homologia sendo estas validadas através de servidores web. Estes peptídeos foram sintetizados manualmente e testados in vitro contra microrganismos Gram-positivos (Staphylococcus aureus) e Gram-negativos (Escherichia coli e Klebsiella pneumoniae). Os peptídeos exibiram baixa atividade antimicrobiana. Entretanto foi verificado que lactof02 foi o mais ativo contra Gram-negativas e A_lact01 foi o mais ativo contra Gram-positivas. Os ensaios hemolíticos indicaram que os peptídeos apresentaram atividade hemolítica variável. Através da análise dos testes in vitro foi possível verificar que a hidrofobicidade global e intrínseca dos peptídeos pode ter sido determinante na modulação da atividade antimicrobiana e hemolítica.
The nutrition quality improvement may play beneficial physiological effects and also reduce the risk of certain diseases. Milk contributes to the recommended nutrients intake and could promote health through its biologically active components, adding many features to nutrition. Otherwise, the search for a new broad-spectrum antibiotic action has increased in last decades due to to the increased number of bacteria resistant to conventional antibiotics. In this view, bovine milk proteins are promising antimicrobial peptides (AMPs) sources, which are inactive when are located inside of a large protein sequence and could be released by digestive enzymes during gastrointestinal transit. Here, those peptide sequences were obtained from free databases and summarily cleaved by gastrointestinal enzymes (pepsin, trypsin and chymotrypsin). This virtual cleavage provided a wide number of peptides that were analyzed and selected according to the inherent AMPs properties, such as size, charge, composition, hydrophobicity, hydrophobic moment and structuring. Five peptides (lactof01, lactof02, A_lacto01, serumA01 e serumA02) were selected, being their three-dimensional struture construted by homology modeling and validated through web servers. These peptides were synthesized and in vitro tested against Gram-positives (Staphylococcus aureus) and Gram-negatives (Escherichia coli e Klebsiella pneumoniae) microorganims. The peptides exhibited low antimicrobial activity. Nevertheless it was found that lactof02 was the most active against Gramnegatives and A_lact01 was the most active against Gram-positives. The hemolytic assays indicated that the peptides showed variable hemolytic activity. Through in vitro analisys of tests it was possible to verify that global and intrinsic peptides hydrophobicity seems to be crucial for modulation of antimicrobial and hemolytic activities.
Danielsson, Niemi Liza. "Host ligands and oral bacterial adhesion studies on phosphorylated polypeptides and gp-340 in saliva and milk /." Doctoral thesis, Umeå : Umeå university, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-32894.
Full textYan, Li. "Mechanism of milk peptide growth factor." Thesis, University of Liverpool, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398580.
Full textMorato, Priscila Neder. "The effect of consuming whey proteins, their component peptides and amino acids on glucose transporters in rat muscle = Efeito do consumo das proteínas do soro do leite, componentes peptídicos e aminoácidos nos transportadores de glicose em músculos de ratos." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/254506.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos
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Resumo: As proteínas do soro do leite apresentam propriedades nutricionais e funcionais que influenciam a modulação de funções bioquímicas e fisiológicas.Estudos têm demonstrado que as proteínas do soro do leite (PSL), principalmente na forma hidrolisada (PSLH) possuem a capacidade de aumentar os níveis de glicogênio muscular. Considerando que a captação de glicose pela célula do músculo esquelético relaciona-se diretamente à atividade de proteínas transportadoras de glicose, este estudo se propôs realizar dois experimentos para conhecer os efeitos da PSL e da PSLH e de alguns dos seus produtos de hidrólise nos transportadores de glicose em músculos de ratos. No experimento 1, o objetivo foi verificar se o consumo de PSL e PSLH modulam a concentração de transportadores de glicose GLUT-1 e GLUT-4 na membrana plasmática (MP) de células musculares de animais sedentários e exercitados. Foram utilizados 48 ratos Wistar machos divididos em dois grupos: sedentários e exercitados, e cada um desses subdivididos em outros três, de acordo com a dieta, totalizando 6 grupos (n=8 por grupo). Os animais foram mantidos por 9 dias recebendo as dietas experimentais baseadas na AIN-93G, com as seguintes fontes protéicas: caseína (CAS), utilizada como controle, proteína do soro do leite (PSL), proteína do soro do leite hidrolisada (PSLH), e o animais exercitados foram submetidos a uma única sessão de exercício a 15m/min durante 60min um dia anterior ao sacrifício. Após o período experimental os animais foram sacrificados, os transportadores de glicose no músculo, GLUT-1 e GLUT-4, foram analisados por western blot. Adicionalmente, glicogênio, aminoácidos livres plasmáticos, insulina e indicadores bioquímicos de saúde foram determinados por métodos padrões. O consumo de PSLH elevou significativamente as concentrações de GLUT-4 na MP e de glicogênio, enquanto GLUT-1, insulina e os indicadores de saúde não apresentaram alterações. Baseado nas evidências do experimento 1, de que o consumo de PSLH eleva os estoques de glicogênio muscular e que também aumenta a concentração do transportador de glicose GLUT-4 na membrana plasmática, o experimento 2 teve como objetivo identificar quais componentes da PSLH poderiam modular a translocação do transportador de glicose GLUT-4 para a MP em músculo esquelético. Foram utilizados 49 ratos Wistar machos divididos em 7 grupos (n=7), que receberam soluções orais de glicose 30% mais 0,55 g/kg de peso corpóreo os seguintes componentes da PSLH: a) glicose (controle); b) PSLH; c) L-isoleucina; d) L-leucina; e) L-leucina mais L-isoleucina; f) peptídeo Lisoleucil- L-leucina; g) peptídeo L-leucil-L-isoleucina. Após receberem as soluções, os animais foram sacrificados, o transportador de glicose GLUT-4 no músculo foi analisado por western blot. Também foram analisados glicogênio, glicemia, insulina, aminoácidos livres plasmáticos e musculares, e indicadores bioquímicos de saúde por métodos clássicos. Entre os componentes testados da PSLH, o peptídeo leucil-isoleucina e o aminoácido isoleucina se mostraram mais eficientes em translocar GLUT-4 para a MP, favorecendo a captação de glicose pelo músculo esquelético. Os resultados obtidos nos experimentos indicam que o consumo da PSLH e de seus componentes ao aumentarem a translocação de GLUT-4 para a membrana plasmática, poderiam auxiliar no tratamento ou prevenção do diabetes do tipo II
Abstract: The milk whey proteins (WP) exhibit nutritional and functional properties which result in the modulation of the biochemical and physiological functions. Studies have shown that the WP, especially those in the hydrolyzed form (WPH),has the capacity to increase muscle glycogen levels. Considering that glucose uptake by the skeletal muscle cell is directly related to the activity of the glucose transporter proteins, the present study proposed to carry out two experiments to determine the effects of WP and WPH and of some of their hydrolysis products on the glucose transporters in rat muscles. The objective of experiment 1 was to verify if the consumption of WP and WPH are able to modulate the concentration of the glucose transporters GLUT-1 and GLUT-4 in the plasma membrane (PM) of muscle cells in sedentary and exercised animals. Forty-eight male Wistar rats were used, divided into sedentary and exercised groups, each of which was sub-divided into three sub-groups according to the diet, giving a total of 6 groups (n=8 per group). The animals were maintained for 9 days on experimental diets based on AIN-93G with the following protein sources: casein (CAS) used as the control, whey protein (WP) and whey protein hydrolysate (WPH). The exercised animals were submitted to a single exercise session for 60 min at 15m/min one day prior to euthanasia. After the experimental period, the animals were euthanized, and the muscle glucose transporters GLUT-1 and GLUT-4 analyzed by western blot. In addition, glycogen, free plasma amino acids, insulin and the biochemical health indicators were analyzed by standard techniques. The consumption of WPH significantly increased the concentrations of GLUT-4 in the PM and of glycogen, whereas GLUT-1, insulin and the health indicators remained unaltered. Based on evidence from experiment 1 that the consumption of WPH raised the muscle glycogen reserves and also the concentration of the glucose transporter GLUT-4 in the plasma membrane, the second experiment was designed to identify which WPH components could modulate translocation of the glucose transporter GLUT-4 to the PM in the skeletal muscle of the animals. Forty-nine male Wistar rats were used, divided into 7 groups (n=7), who were orally fed 30% glucose solutions plus 0.55 g/kg of body weight of the following WPH components: a) glucose (control); b) WPH; c) L-isoleucine; d) L-leucine; e) L-leucine plus L-isoleucine (50:50 mixture of both amino acids); f) L-isoleucyl-L-leucine peptide or g) L-leucyl-L-isoleucine peptide. After receiving the solutions, the animals were euthanized and the GLUT-4 determined by western blot. Glycogen, glycemia, insulin, free plasma and muscle amino acids, and the biochemical health indicators were also analyzed by classical methods. Of the WPH components tested, the peptide L-leucyl-L-isoleucine and the amino acid L-isoleucine were shown to be more efficient in translocating GLUT-4 to the PM, favoring the capture of glucose by the skeletal muscle. The results obtained from these experiments indicated that the consumption of WPH and its components increased GLUT-4 translocation to the plasma membrane, and could aid in the treatment and prevention of type ll diabetes
Doutorado
Nutrição Experimental e Aplicada à Tecnologia de Alimentos
Doutora em Alimentos e Nutrição
Frochot, Céline. "Étude d'un décapeptide à activité de type benzodiazépine issu d'une protéine du lait bovin." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL104N.
Full textSuda, Susanne. "Atrial natriuretic peptide in mild to moderate chronic renal failure /." [S.l : s.n.], 1987. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Full textMercer, Eric Alexander John. "Expression, characterisation and structural analysis of the putative slow voltage-dependent potassium channel minK." Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243623.
Full textAbd, el-Baky Hassan Mohamed Abd el-Aziz [Verfasser]. "Milk clotting using peptidases of basidiomycetes / Hassan Mohamed Abd El-Aziz Abd El-Baky." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2011. http://d-nb.info/1017333874/34.
Full textStoeckel, Marina [Verfasser]. "Shelf-stable milk products: Impact of bacterial spores, peptidases from Pseudomonas, and plasmin / Marina Stoeckel." München : Verlag Dr. Hut, 2017. http://d-nb.info/1137023791/34.
Full textBEZERRA, Vilma Sobral. "Caracterização e atividade biológica de peptídeos obtidos pela hidrólise enzimática de caseína do leite de cabra Moxotó (Capra hircus Linnaeus, 1758)." Universidade Federal Rural de Pernambuco, 2011. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/4608.
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Dairy proteins have bioactive peptides production great potential, however, their bioactivity is achieved only after enzymatic hydrolysis, which produces substances beneficial to health when incorporated into food or pharmaceuticals. Among them, casein has been used for this purpose. This study aims to determine peptide profile and amino acid sequence of bioactive peptides derived from Moxotó goat milk casein hydrolysis, using proteolytic enzymes such as trypsin, pepsin, papain and a protease extracted from Penicillium aurantiogriseum URM 4622. Enzymatic hydrolysis was performed using a statistical experimental design, which independent variables were pH, enzyme substrate (E: S), temperature and reaction time in Moxotó goat milk casein hydrolysis. Hydrolysis products were visualized in SDS-PAGE electrophoresis. Hydrolysates subjected to ultrafiltration (cut off 3000Da) were used to determine biological properties. Antioxidant activity was evaluated by ABTS + [2,2 '-Azin-bis (3-ethylbenzothiazoline) 6-sulfonic acid] method, using the pool of peptides (permeate <3000Da; retentate >3000Da). Antimicrobial activity was determined by the Clinical and Laboratory Standards Institute. Binding through the zinc solubility of zinc in the sample by Mass Spectrometry Inductively Coupled Plasma. Peptide profile and amino acid sequences were determined by mass spectrometry MALDI-TOF-MS/MS. The best hydrolysis degree (38.27%) was obtained with pepsin enzyme pH 3.0, 1:100 E: S, temperature of 40°C and 5 hours time reaction. However, a high hydrolysis degree precluded the use of these hydrolysates for bioactive peptides obtention. Casein tryptic hydrolysates demonstrated antioxidant activity up to 3242.3 μmol.L-1TROLOX/mg peptide in retentate (> 3000Da). By papain use, we obtained an activity up to 2329.6 μmol.L-1TROLOX /mg of peptide in permeate (<3000Da). The peptides produced by P. auratiogriseum protease action showed activity from 843.17 to 2587.30 μmol.L-1of Trolox / mg of 10 and 29% peptides hydrolysates, respectively, which were compatible with natural antioxidants, such as C vitamin and α-tocopherol. Goat casein tryptic hydrolysates demonstrated antimicrobial activity against Enterococcus faecalis ATCC 6057, Escherichia coli ATCC 2508, Klebisiela pneumoniae ATCC 29665, Bacillus subtilis ATCC 6633. Casein hydrolysates showed IC50 of 4.46 mg/g for zinc binding. Mass spectrometry MALDI TOF MS\MS allowed the visualization of caprine casein peptides in permeate (<3000Da), ranging from 568 to 2923 Da. It also showed LLYQEPVLGPV and HPINHQGLSPEVPNENLLR amino acids sequences for αs1 and β-casein, respectively, from casein tryptic hydrolysates; LLYQEPVLGPV sequences of β-casein, the NPWDQVK αs2 NENLL-casein and-casein in the αS1 casein hydrolysates by papain use; LLYQEPVLGPVRGPFPI β-casein sequence from casein hydrolysates obtained by the use of P. aurantiogriseum URM 4622 protease. The casein hydrolysates bioactive properties are referent to the prevalence of hydrophobic amino acids, which possibility of their use as bioactive peptides.
Proteínas lácteas apresentam grande potencial na produção de peptídeos bioativos. A caseína se destaca na produção de bioativos. Entretanto, a sua bioatividade só é conseguida após hidrólise enzimática, ao qual se produz substâncias benéficas à saúde quando incorporados em alimentos ou produtos farmacêuticos. O objetivo deste trabalho foi o de caracterizar e a avaliar atividades biológicas e determinando o perfil peptídico e a sequência de aminoácidos dos peptídeos bioativos obtidos a partir de hidrólise da caseína do leite de cabra Moxotó, usando enzimas proteolíticas tripsina, pepsina, papaína e protease extraída de Penicillium aurantiogriseum URM 4622. A hidrólise enzimática foi realizada através de planejamento experimental estatístico, os quais as variáveis independentes foram pH, relação enzima substrato (E:S), temperatura e tempo de reação na hidrólise da caseína do leite de cabra Moxotó. Os produtos de hidrólise foram visualizados em eletroforese SDS‑PAGE. Os hidrolisados submetidos à ultrafiltração (Cut off 3000Da) foram utilizados para determição das propriedades biológicas. A atividade antioxidante foi avaliada no pool de peptídeos, permeado (<3000Da) e retentado (>3000Da) usando-se o método ABTS+ [2,2’-azino-bis (3-etilbenzotiazolin) 6-ácido sulfônico]. A atividade antimicrobiana foi determinada pelo método do Clinical and Laboratory Standards Institute. O carreamento de zinco através da solubilidade do zinco na amostra através da Espectrometria de Massa em Plasma Indutivamente Acoplado. O perfil peptídico e as sequências de aminoácidos foram determinados por espectrometria de massa MALDI-TOF-MS/MS. O melhor grau de hidrólise (38,27%) foi obtido com a enzima pepsina usando pH 3,0, E:S de 1:100, 40ºC e 5 horas de reação. Entretanto, um alto grau de hidrólise impossibilitou o uso desses hidrolisados para obtenção de peptídeos bioativos. Os hidrolisados trípicos da caseína mostraram atividade antioxidante de até 3.242,3μmol.L-1TROLOX/mg de peptídeo no retentado (>3000Da). Com o uso da papaína, obteve-se uma atividade de até 2.329,6μmol.L-1TROLOX/mg de peptídeo no permeado (<3000Da). Os peptídeos produzidos pela ação da protease produzida por P. auratiogriseum apresentaram atividade de 843,17 a 2.587,30μmol.L-1de TROLOX/mg de peptídeos para os hidrolisados com 10 e 29% respectivamente, os quais foram compatíveis a antioxidantes naturais, como a vitamina C e α-tocoferol. Os hidrolisados trípticos da caseína caprina apresentaram atividade antimicrobiana frente a Enterococcus faecalis ATCC 6057, Escherichia coli ATCC 2508, Klebisiela pneumoniae ATCC 29665, Bacillus subtilis ATCC 6633. Os hidrolisados de caseína mostraram IC50 de 4,46mg/g para carreamento de zinco. A espectrometria de massa MALDI TOF MS permitiu visualizar os peptídeos no permeado (<3000Da) da caseína caprina, na faixa de 568 a 2.923 Da. Mostraram as sequências LLYQEPVLGPV e HPINHQGLSPEVPNENLLR e da β- e αs1-caseina para hidrolisados trípticos da caseína; as sequências LLYQEPVLGPV da β-caseína, NPWDQVK da αs2-caseina e NENLL da αS1-caseína nos hidrolisados da caseína com o uso da papaína e a sequência LLYQEPVLGPVRGPFPI da β-caseina no hidrolisado da caseína com o uso da protease produzida por P. aurantiogriseum URM 4622. As propriedades bioativas dos hidrolisados da caseína referem-se à prevalência de aminoácidos hidrofóbicos, o que possibilita o uso destes como peptídeos bioativos.
BELIN, VINCENT. "Etude des mecanismes de synchronisation et de recrutement des cellules ocytocinergiques chez la ratte allaitante." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13097.
Full textBader, Lange Miranda Lu. "IN VIVO OXIDATIVE STRESS IN ALZHEIMER DISEASE BRAIN AND A MOUSE MODEL THEREOF: EFFECTS OF LIPID ASYMMETRY AND THE SINGLE METHIONINE RESIDUE OF AMYLOID-β PEPTIDE." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/117.
Full textHumbert, Gérard. "La protéase alcaline (plasmine) du lait : Dosage, purification et implications en technologie laitière." Nancy 1, 1986. http://www.theses.fr/1986NAN10382.
Full textBram, Jéssyka Maria de França Monezi. "Biomarcadores em líquor e em leucócitos no transtorno depressivo maior, comprometimento cognitivo leve e doença de Alzheimer." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/5/5142/tde-28072017-134924/.
Full textThe accelerated aging process has brought not only changes in the demographic profile, but also in the epidemiological profile of the population. Among the health problems found in the elderly, mental disorders are worth mentioning, since they affect about a third of this population, being the depressive disorders and dementia the most prevalent mental health problems. Major depressive disorder (MDD), as well as mild cognitive impairment (MCI), have been associated with higher levels of cognitive symptoms and increased risk of developing dementia, especially Alzheimer\'s disease (AD). Therefore, it is important to identify individuals at greater risk for the development of AD in order to provide treatment at early stages of the disease process. In this way, this study aimed to compare the biological markers involved in the amyloid cascade under the clinical conditions TDM, CCL, DA and healthy controls expressed in leukocytes and CSF. We determined the protein expression of ADAM10, BACE1 and PSEN1 and A? peptides in leucocytes and CSF using the Western Blotting, ELISA and Luminex methods. When analyzing the expression of the secretases and the A? peptide in leukocytes, we did not observe statistically significant differences between the groups, except for the expression of the PSEN1 protein, which presented lower levels in AD in relation to MDD. In relation to CSF, we observed a significant reduction of the Abeta peptide in AD when compared to MCI, TDM and also to healthy controls, but no differences in expression of this peptide were observed between MCI, MDD and healthy controls. These results suggest that the leukocytes, although expressing the key components and the enzymatic machinery necessary for the proteolytic processing of the amyloid precursor protein (APP), may not represent an adequate biological matrix for studies addessing the amyloid cascade. In addition, results obtained in CSF samples, according to the analyzed series, reinforce the literature data that establish the reduction of A? peptide concentration in CSF as a biomarker of AD, without detecting alterations in the other groups studied. Our (negative) results in relation to the expression of APP-secretases in CDescriptors: MSF add data to this still controversial domain of the literature. Therefore, more studies should be done so that we can better understand the pathways related to the development of AD
El, Bari Nezha. "Étude de l'antigénicité de la caséine B et de ses produits de dégradation : Mise au point du dosage de la caséine B dans le lait par immunonéphélémétrie à supports microparticulaires." Nancy 1, 1989. http://www.theses.fr/1989NAN10055.
Full textWang, Li-Jie, and 王儷潔. "Production of Hydrophobic Peptides from Goat Milk." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/py7fvx.
Full text國立宜蘭大學
生物技術與動物科學系動物科學碩士班
102
Proline-rich peptides (PRP), with specific proline sequence and high amount of hydrophobic amino acids, hase been shown to interfere with β-amyloid (Aβ) hydrophobic aggregation, lower blood pressure and cholesterol, etc. To produce hydrophobic peptides, the amino acid sequences of common food proteins such as casein, whey protein, soy protein and ovalbumin, were searched and compared. β casein was found to have the highest amount of PRP, and goat milk contains more β casein than cow milk does. Therefore, goat milk casein was selected for PRP production. Casein from rennet coagulation was hydrolyzed with trypsin with the result that the hydrophobic peptide aggregated affecting the efficiency of hydrolysis. Further treatment with prior stretching of casein at high temperature did not improve the hydrolysis efficiency. Since casein exists as micelle which composed of more than ten thousands casein molecules, it is resonable that dissociation of the casein micelles might enhance the enzymatic hydrolysis. Addition of 30 mM EDTA or 200 mM citric acid, as well as application of ultrasound (20 kHz 50 W) could dissociate the casein micelle, while increasing pH was not effective. The micelle dissociated casein was subjected to trypsin hydrolysis, and the results confirmed the improved efficiency, with the ultrasound treatment the best. Previously, monoclonal antibody (mAb) against spicific PRP sequence was generated in our laboratory. The mAb was used to detect the casein hydrolysate, and the molecular weight was below 6.5 kDa. The PRP was further extracted with different concentration of methanol or ethanol to increase the hydrophobicity. Amino acid analysis of the ethanol extracted PRP showed 59.46% of hydrophobic amino acids, with 17.91% Proline. This research demonstrated that trypsin digestion of goat milk casein could produce high amount of hydrophobic proline-rich peptides.
Elfahri, Khaled. "Anticarcinogenic Peptides Released from Milk Proteins by Lactobacillus Strains." Thesis, 2018. https://vuir.vu.edu.au/36844/.
Full textElfahri, Khaled. "Release of bioactive peptides from milk proteins by lactobacillus species." Thesis, 2012. https://vuir.vu.edu.au/21473/.
Full textChen, Tai-Jung, and 陳臺榕. "Isolation and Identification of Bioactive Peptides of Whey from Fermented Milk." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/73348338110129158220.
Full text國立臺灣海洋大學
食品科學系
92
二、英文摘要 The commercial whole and skim milk powder was fermented with mixed two lactic acid bacteria (AB) and addition of Protease F at 430C for 5 hrs. The effect of whey from lactic acid bacteria fermented milk on Inhibitory activity against angiotensin I-converting enzyme and antihypertensive effect were investigated. When lactic acid bacteria and Protease F was added then fermented 5 hrs, the peptide content of whey increased from 2.1 to 32.8 mg/g and the IC50 value decreased from 0.708 to 0.266 mg/ml. After 15 days to stroage at 80C, the IC50 value decreased from 0.266 to 0.147 mg/ml. The whey was fractionated by gel filtration using Sephadex G-15 column. The fractionated product of peptide with molecular weight 534 - 364 Da and below than 100 Da showed the highest inhibitory efficiency ratio (IER) being 1329 and 1384 %/ mg/ml, respectively. The whey (contained 0.5% (w/v) NaCl) as drinks was administrated to spontaneously hypertensive rat (SHR) for 8 weeks. After 4 weeks oral administration of whey , the systolic blood pressure (SBP) was significantly lower than water group (contained 0.5% (w/v) NaCl) .The average SBP decreased 15.9 mmHg after 8 weeks oral administration.
Fatah, Bashir Ahtesh. "Anti-hypertensive (Angiotensin converting enzyme-inhibitory) peptides released from milk proteins by proteolytic microorganisms and enzymes." Thesis, 2016. https://vuir.vu.edu.au/32314/.
Full textHo, Chin-Han, and 何金翰. "Identification, isolation and bioactivity of short peptides in mammary gland secretion of dairy cows after milk stasis." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/98994955293997066333.
Full text國立中興大學
動物科學系所
95
Peptides released from casein by trypsin, pepsin, or Lactobacillus hydrolysis exhibit immunostimulatory, antihypertension, antimicrobial and opioid-like functions. Milking cessation induces within-gland protease activities and casein hydrolysis. As a consequence, the present study was proposed to isolate and characterize immunomodulatory peptides from dry secretion of dairy cows. Mammary dry secretions were collected from Holstein cows at weeks 0, 1, 2, and 3 after drying off, using regular milk (2-3 month postcalving) as a control. Whey protein and proteose peptones were prepared by defatting and ultracentrifugation. Bradford-protein quantitation, electrophoretic separation, and casein immunoblotting were applied to analyze compositional changes of mammary secretions after drying off. Mammary dry secretions (week 1 after drying off) and regular milk were ultrafiltrated through 10 kDa size exclusion membranes and the 10 kDa permeates were assayed for their immunomodulatory effects using phorbol 12-myristate 13-acetate (PMA)-stimulated chemiluminescence of bovine blood polymorphonuclear leukocyte (PMN). Reversed-phase highperformance liquid chromatography (RP-HPLC), matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF) and liquid chromatography-electrospray ionization/tandem mass spectrometry (LC-ESI/MS/MS) were used in further separation and characterization of mass and sequence. Results showed that total protein concentration of mammary secretions were positively correlated (r2 = 0.99) to weeks after milk stasis, and it was significantly greater (P < 0.001) than that of regular milk except for week 0. Conversely, concentration and proportion of casein in mammary secretions were negatively correlated (r2 = 1 and 0.88, respectively) with weeks after drying off, they were significantly lower (P < 0.05 and P < 0.001, respectively ) than those of regular milk except for week 0. Electrophoretic results indicate that contents of α-lactalbumin, β-lactoglobulin and soluble casein of mammary secretions decreased, while contents of lactoferrin, BSA and IgG increased after drying off. Densitometeric scanning results suggest that the proportion of proteose peptones of mammary secretions after drying off was greater than that of regular milk (2.60%) and peaked at week 1 (15.78%). Western blot using anti-casein antibody showed that casein-derived peptides increase prominently and peaked at week 1 after drying off. Bioactivity studies showed that 10 kDa permeates of mammary dry secretions significant by (P < 0.05) inhibited the response of PMN to PMA. RP-HPLC separation resolved the 10 kDa permeates of both mammary dry secretions and regular milk into three fractions, according to MALDI-TOF, fraction 1 of mammary dry secretions and regular milk contains 1764.17 Da and 1337.76 Da as the major component of respectively, and fraction 3 contains 1046.60 Da as the major component of both mammary dry secretions and regular milk. Peptide sequencing by LC-ESI/MS/MS revealed 236 types of β-casein-derived sequences and 4 types of β-LG-derived sequences in 10 kDa permeates of mammary dry secretions. Meanwhile for regular milk, 64 types of sequences are derived from β-casein, 5 types of sequences are derived from β-LG and 2 types of peptides derived from BSA. There are 4 identified sequences in mammary dry secretions match with known bioactive peptides, including β-casein f60-68 and f191-209 with antihypertensive bioactivity, β-casein f193-202 with antihypertensive and immunomodulatry bioactivity, and β-casein f193-209 with antihypertensive, immunomodulatry and antimicrobial bioactivity. However, none of the sequences identified in the 10 kDa permeates of regular milk matches with any known bioactive peptides. Extensive database searching suggested still some sequences are different from know bioactive peptides by merely 1 to 2 amino residues, such as β-casein f60-68 of mammary dry secrtions and β-casein f60-67 of regular milk, similar to opioid-like peptides β-CN f60-70 (mainly f60-66 and f60-70), and β-casein f1-24 of mammary dry secretions, similar to caseinophosphopeptide β-casein (f1-25) with 4 phosphoserin. This study clearly shows that milk protein hydrolysis in mammary gland of cows after drying off released many potential bioactive peptides, which may directly involve in mammary tissue involution and remodeling or, alternatively, through resorption, exert systemic effects to facilitate drying up procedure. Further studies are warranted to explore the fate and function of respective peptides.
Elawadli, Inas. "Investigations into the Effects of Lactobacilli on Murine Dendritic Cells." Thesis, 2012. http://hdl.handle.net/10214/3908.
Full textГолдаєвич, Тетяна Василівна, and Tetiana Vasylivna Holdaievych. "Виділення біоактивних фосфосеринових пептидів з білків молока." Master's thesis, 2020. http://elartu.tntu.edu.ua/handle/lib/33667.
Full textQualification work consists of an introductory part, main, conclusions and proposals for production, a list of references and appendices. The total volume of work contains 72 pages, 10 tables and 12 figures. The list of used literature consists of 70 items, including 25 foreign ones.Research on education and qualification level of Master in the specialty 181 «Food technology» Ternopil National Technical University named Ivan Pulyuy, Ternopil, 2020. The work established optimal pH conditions, the ratio of enzyme preparation and substrate, the concentration of pancreatin to obtain bioactive phosphoserine peptides from milk proteins. Methods for determining protein concentration, titratable acidity, pH, electrophoresis and gel filtration were used.
Анотація Вступ Мета і завдання роботи 1. Огляд літератури 1.1. Пептиди та їх значення 1.1.1. Поняття про пептиди 1.1.2. Хімічний синтез пептидів 1.1.3. Природні пептиди та їх значення 1.2. Отримання білкових гідролізатів 1.2.1. Загальні відомості про білкові гідролізати 1.2.2. Методи гідролізу білків 1.2.3. Додавання білкових гідролізатів у продукти харчування 1.2.4. Використання продуктів на основі гідролізату молочного білка при харчовій алергії дітей раннього віку 1.3. Отримання природніх біоактивних пептидів шляхом протеолізу білків молока 1.3.1. Білковий склад молока. Біологічні функції білків молока 1.3.2. Отримання біоактивних пептидів казеїну та сироваткових білків молока 1.3.3. Казоморфіни і казок сини – агоністик й антагоністи оплатних рецепторів 1.3.4. Казокініни – пептиди з антигіпертензивною активністю 1.3.5. Антитромботичні пептиди казеїнового походження 1.3.6. Імуномодуляторні пептиди 1.3.7. Лакторфіни – пептиди з опіоїдною дією 1.3.8. Вплив казеїнових фосфосеринових пептидів на засвоєння міренальних речовин 2. Матеріали і методи досліджень 2.1. Матеріали та реактиви 2.2. Визначення кислотності титрованої 2.3. Визначення pH 2.4. Визначення концентрації білків 2.5. Електрофорез у ПАГ 2.6. Гель-фільтрація 3. Результати власних досліджень та їх обговорення 3.2. Встановлення значення pH для протеолізу фосфосеринових пептидів 3.3. Визначення оптимальних концентрацій ферментного препарату для отримання фосфосеринових пептидів 4. Охорона праці та безпека в надзвичайних ситуаціях 4.1. Охорона праці 4.2. Безпека в надзвичайних ситуаціях Висновки Список використаної літератури Додатки Апробація результатів магістерської роботи
Кутянська, Наталія Степанівна, and Nataliia Kutianska. "Отримання природних біоактивних пептидів з β-казеїну молока з проектуванням цеху з виробництва масла вершкового з переробкою маслянки та знежиреного молока." Master's thesis, 2021. http://elartu.tntu.edu.ua/handle/lib/36886.
Full textin this qualification work the plan of shop on production is projected: 200-300 слів butter (whipping method) with a capacity of 35 t per shift of whole milk with fat content of 3,6%. It contains: introduction, an explanatory note, а graphic, research part and а section on labor protection and safety in emergencies. The introduction describes the characteristics of butter, its benefits and properties. The calculation-explanatory note illustrates technological schemes and describes technologies, calculations of raw materials, finished products, selection and calculation of technological equipment, calculation of production areas required for the production of butter. The scheme of technological production of skimmed pasteurized milk, butter with fat content of 72.5% and 70%, fresh buttermilk and buttermilk drink (dietary) is provided. The technological equipment is selected in accordance with the amount of processing raw materials, taking into account the requirements of the instructions for determining the production capacity of the dairy industry. The graphic sheets show the scheme of directions of raw material processing, the plan of the shop for butter production, the hardware-technological scheme, production processes organization graph and the transversal cross section of the production shop. The research part describes the structure and properties of caseins, namely β-casein, and methods and research methods of caseins. The section on labor protection and safety in emergencies describes the ways in which the employer interacts with the employee and provides safe working conditions for all subordinates in compliance with all requirements and fire safety
АНОТАЦІЯ ВСТУП 1 ТЕХНІКО-ЕКОНОМІЧНЕ ОБҐРУНТУВАННЯ 2 ТЕХНОЛОГІЧНА ЧАСТИНА 2.1 Технологічні розрахунки виробництва запроєктованого асортименту 2.1.1 Вихідні дані та схема переробки сировини 2.1.2 Сировинно-продуктовий розрахунок 2.2 Вибір та обґрунтування технологічних процесів і режимів виробництва 2.2.1 Вимоги до сировини та характеристика загальних операцій виробництва молочних продуктів 2.3 Забезпечення технологічного процесу виробництва запроєктованого асортименту 2.3.1 Підбір технологічного обладнання 2.3.2 Розрахунок площ виробничих і допоміжних приміщень 3 НАУКОВО-ДОСЛІДНА ЧАСТИНА 3.1 Аналітичний огляд літературних джерел 3.1.1 Загальне уявлення про казеїн 3.2.2 Будова і властивості β-казеїну 3.2 Мета, об’єкт, предмет та методи дослідження 3.3 Результати досліджень 3.3.1 Гомогенний β-казеїновий субстрат з казеїнових міцел 3.3.2 Отримання активної низькомолекулярної фракції пептидів з продуктів гідролізу β-казеїну 4 ОХОРОНА ПРАЦІ ТА БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ 4.1 Охорона праці 4.2 Безпека в надзвичайних ситуаціях ВИСНОВКИ СПИСОК ВИКОРИСТАНИХ ЛІТЕРАТУРНИХ ДЖЕРЕЛ
Берекета, Віта Петрівна, and Bereketa V. P. "Гідроліз протеїнів сироватки молока протеазами тваринного походження." Master's thesis, 2019. http://elartu.tntu.edu.ua/handle/lib/30086.
Full textБерекета В.П. Гідроліз протеїнів сироватки молока протеазами тваринного походження. 181 «Харчові технології» – Тернопільський національний технічний університет імені Івана Пулюя. – Тернопіль, 2019. В ході виконання дипломної роботи було проведено гідроліз протеїнів сироватки молока протеазами тваринного походження, а саме трипсином, хімотрипсином, панкреатином. Було порівняно динаміку гідролізу концентрату сироваткових білків за дії різних протеолітичних препаратів. Виявлено, що найбільшою протеолітичною активністю, серед використаних в досліді препаратів, володіє хімотрипсин. Проведено електрофоретичний аналіз фракційного складу протеїнів, завдяки якому представлений типовий поділ білкових фракцій сироватки молока. Визначено молекулярно-масовий розподіл отриманих поліпептидів і пептидів під час гідролізу в кожному секторі хроматограми завдяки проведенню гель-фільтрації реакційної суміші на сефадексі G-50. Проведено електрофорез в ПААГ протеїнових фракцій концентрату сироваткових білків для визначення фракційного складу проб, які брали на встановлених етапах гідролізу (0 хв, 60 хв, 120 хв і 180 хв). Також розраховано залишкову кількість нерозщепленого β-лактоглобуліну і α-лактальбуміну після 120 хвилин гідролізу. Ключові слова: ГІДРОЛІЗ БІЛКІВ, ЕЛЕКТРОФОРЕЗ, ГЕЛЬ-ФІЛЬТРАЦІЯ, ГІДРОЛІЗАТИ ПРОТЕЇНІВ СИРОВАТКИ МОЛОКА, БІОЛОГІЧНО АКТИВНІ ПЕПТИДИ.
Bereketa V.P. Lactoserum proteins hydrolysis by proteases of animal origin. 181«Food technology»– Ternopil Ivan Puluj National Technical University. – Ternopil, 2019. During the course of diploma milk whey protein`s hydrolys was conducted with proteases of animal origin, namely trypsin, chymotrypsin, pancreatin. The dynamics of hydrolysis of whey protein concentrate by the action of various proteolytic drugs was compared. Chymotrypsin was found to have the highest proteolytic activity among the drugs used in the experiment. The electrophoretic analysis of the fractional composition of proteins was carried out, by which a typical separation of the protein fractions of milk whey was presented. The molecular weight distribution of the resulting polypeptides and peptides during hydrolysis in each sector of the chromatogram was determined by gel filtration of the reaction mixture on Sephadex G-50. Conducted electrophoresis in PAАG protein fractions of whey protein concentrate to determine the fractional composition of samples taken at the established stages of hydrolysis (0 min, 60 min, 120 min and 180 min). Also, the residual amount of unbranched βlactoglobulin and α-lactalbumin after 120 minutes of hydrolysis was calculated. Keywords: PROTEIN HYDROLYSIS, ELECTROPHORESIS, GEL FILTRATION, MILK PROTEIN WHEY PROTEIN HYDROLYSATES, BIOLOGICALLY ACTIVE PEPTIDES.
Реферат……… Вступ…… Мета і завдання роботи…….. Розділ 1. Огляд літератури……… 1.1. Загальна характеристика білків сироватки молока….. 1.2. Використання протеїнів сироватки в харчових технологіях… 1.3. Гідролізати білків сироватки……… 1.4. Біологічно активні пептиди білків сироватки………. Розділ 2. Матеріал і методи досліджень……........ 2.1. Характеристика концентрату сироваткових білків ….. 2.2. Визначення концентрації білків спектрофотометричним методом.. 2.3. Визначення протеолітичної активності спектрофотометричним методом…………… 2.4. Гель-фільтрація……..... 2.5. Електрофорез………..... Розділ 3. Власні дослідження…… 3.1. Результати досліджень продуктів протеолізу концентрату сироваткових білків…….. 3.1.1. Порівняння динаміки протеолізу концентрату сироваткових білків за дії різних протеолітичних препаратів…… 3.1.2. Гель-фільтрація продуктів протеолізу концентрату сироваткових білків на сефадексі G-50…….. 3.1.3. Електрофорез в поліакриламідному гелі протеїнових фракцій концентрату сироваткових білків…….... 3.2. Обговорення результатів протеолізу концентрату сироваткових білків…… Розділ 4. Обґрунтування економічної ефективності виробництва гідролізатів сироваткових білків………… Розділ 5. Охорона праці…………. 5.1. Відповідальність посадових осіб і працівників за порушення законодавства про охорону праці……………. 5.2. Основні положення державного соціального страхування від нещасного випадку на виробництві та професійного захворювання…… Розділ 6. Безпека в надзвичайних ситуаціях………… Розділ 7. Екологія………… Висновки і пропозиції виробництву……. Список використаної літератури ………. Апробація результатів магістерської роботи…
Wu, Ling-Tsai, and 吳鈴彩. "Establishment of an optimal pasteurization condition of fresh milk by the peptide content from protein hydrolysis in vitro." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/41773484110993331486.
Full text東海大學
畜產與生物科技學系
93
Milk is a highly nutritious food, and must be pasteurized to destroy all the pathogenic and microorganisms in order to extend shelf life. However, the different pasteurization conditions could induce physicochemical changes in milk. This study was intended to establish an optimal pasteurization condition of milk using response surface methodology by the peptide content from protein hydrolysis in vitro. The first factor temperature (X1) and the second factor holding time (X2) of response surface were located through preliminary study. Then X1 and X2 were used as the center point of central composite rotatable design in order to establish an optimal pasteurization condition of fresh milk. The physicochemical properties of fresh milk processed from the optimal pasteurization condition were then compared with market milk. Results suggested that temperature (X1) of 81℃ and holding time (X2) of 20 seconds, were used as center point for central composite rotatable design. Fresh milk pasteurized by 81℃ for 20 seconds had the highest peptide content. The alkaline phosphatase and lactoperoxidase activity tests were negative of fresh milk pasteurized by 81℃ for 20 seconds. The L*, b* value and titratable acidity of fresh milk pasteurized by 81℃ for 20 seconds were significantly lower (P<0.05) than market milk. In addition, pH value, available lysine content, undenatured whey protein content and peptide content were significantly (P<0.05) higher than market milk. The electrophoresis showed that fresh milk pasteurized by 81℃ for 20 seconds had more undenatured whey protein than market milk. The overall acceptability of fresh milk pasteurized by 81℃ for 20 seconds in sensory evaluation was among different market milk. Therefore, temperature of 81℃ and holding time of 20 seconds was the optimal pasteurization condition of fresh milk.
CHEN, CHIA-LING, and 陳佳伶. "The Study of Goat Milk-Derived Proline-Rich Peptide in Promoting Neural Plasticity and Its RAGE-binding Ability." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7mcyz3.
Full textTorres, D. "Gelificação térmica de hidrolisados enzimáticos de proteínas do soro de leite bovino : comportamento de sistemas aquosos mistos péptidos-polissacarídeos." Master's thesis, 2005. http://hdl.handle.net/1822/4234.
Full textDe acordo com as estimativas mais recentes produzem-se mundialmente cerca de 286 milhares de toneladas de soro de leite por dia. O soro produzido diariamente pode providenciar, em média, 2,4 milhares de toneladas de proteínas que, potencialmente, podem satisfazer as necessidades proteicas diárias a cerca de 35 milhões de pessoas. Durante muito tempo o soro foi encarado como um resíduo industrial ou produto com valor comercial residual. Só nas três últimas décadas foram desenvolvidos processos de separação que permitem obter ingredientes alimentares com alto teor proteico a partir do soro de leite. As proteínas do soro de leite bovino estão entre as mais equilibradas fontes de aminoácidos da dieta humana; para além disso, foram já descritas muitas actividades biológicas, essenciais para o desenvolvimento harmonioso da cria, com repercussões benéficas também no ser humano. Muitas dessas propriedades estão encriptadas nas moléculas proteicas manifestando-se após proteólise que pode ocorrer durante o processo de digestão ou durante o processamento enzimático e/ou fermentativo. A tripsina, enzima seleccionada para o trabalho desenvolvido, revela-se uma enzima interessante para a libertação de péptidos bioactivos, dada a sua especificidade, mas também para o aumento da digestibilidade e diminuição da alergenicidade das proteínas do soro de leite bovino (capítulo 1). As proteínas do soro podem ser usadas numa grande variedade de aplicações na indústria alimentar. Uma das funcionalidades das proteínas resulta da capacidade que possuem de responder a alterações ambientais alterando a sua conformação nativa e, por agregação, formar redes elásticas tridimensionais – gelificação. Os géis conferem estrutura, textura e estabilidade aos alimentos; possibilitam, ainda, a retenção de grandes quantidades de água e outras pequenas moléculas dentro da matriz alimentar (capítulo 2). No capítulo 3 do trabalho que se apresenta, estudaram-se as alterações do comportamento reológico (a baixa deformação) que ocorrem durante o processo de gelificação por aquecimento de suspensões de proteínas de soro, a pH neutro e força iónica de 220 mM. As propriedades reológicas dos géis finais foram estudadas em função da concentração de proteínas e do grau de hidrólise enzimática a que, previamente, as proteínas do soro de leite foram sujeitas. O aumento do grau de hidrólise reduz drasticamente a capacidade de gelificação das proteínas do soro e, ao contrário da variação da concentração, altera o balanço de forças que suportam a estrutura tridimensional do gel, provavelmente, diminuindo a contribuição das ligações covalentes e hidrofóbicas e aumentando a contribuição das pontes de hidrogénio. No capítulo 4, estudaram-se as alterações do comportamento reológico que ocorrem durante o processo de gelificação por aquecimento de sistemas mistos de proteínas de soro (nativas ou hidrolisadas) e polissacarídeos neutros (galactomananos), a pH neutro e força iónica de 220 mM. Para os vários sistemas estudados, as propriedades reológicas dos géis finais foram estudadas em função da concentração de polissacarídeos. Recorrendo a técnicas microscópicas (microscopia óptica e microscopia confocal de varrimento laser), verificou-se que, da incompatibilidade termodinâmica entre os dois tipos de biopolímeros, resultou uma separação de fases do tipo segregativo. Este fenómeno, por ser simultâneo ao processo de gelificação, condiciona fortemente as propriedades reológicas dos géis, pois, se por um lado favorece a concentração da fase proteica gelificante, por outro, diminui a conectividade dessa mesma fase. A quantificação da massa de água (e solutos), excluída durante o processo de gelificação (sinérese), permitiu verificar que a presença de polissacarídeos diminui a severidade do fenómeno.
Accordingly to the last estimates, the daily production of milk whey is about 286 thousand tons. The produced whey can provide 2.4 thousand tons of proteins that, potentially, can assure the daily protein requirements of about 35 million people. In the past, whey was looked upon as an industrial residue or a low value product. Only in the last three decades separation processes were developed that allow the production of food ingredients with high protein content from milk whey. Proteins from bovine milk whey are between the more equilibrated human dietary sources of amino acids; they have been described as possessing many essential biological activities which are important for the harmonious development of the calf and have also beneficial repercussions for humans. Many of these bioactivities are encrypted in the native protein molecules and are only revealed after proteolysis during the natural digestion process or during enzymatic and/or fermentative treatments. For this work, trypsin was selected to hydrolyse whey proteins since, due to its specificity, trypsin is an interesting enzyme for the liberation of bioactive peptides and, also, for the improvement of protein digestibility and for decreasing protein allergenicity (chapter 1). Whey proteins can be used for a wide range of industrial food applications. One of proteins functionalities results from their capacity to respond to changes in their physicochemical environment by modifying their native conformation and forming, after aggregation, tridimensional elastic networks – gelling. Gels confer structure, texture and stability to food products; they also allow the retention of large quantities of water and other small molecules inside the food matrix (chapter 2). In the 3rd chapter of the present work, the changes in the rheological behaviour during the heat-induced gelling process of whey protein dispersions were studied by small deformation rheology (neutral pH and ionic force 220 mM). The rheological properties of the final gels were studied as a function of protein concentration and as a function of the degree of enzymatic hydrolysis. Hydrolysis reduces dramatically the gelling ability of whey proteins and alters the balance of the different forces that sustain the elastic network, probably, increasing the proportion of hydrogen bonds and decreasing the proportion of covalent and hydrophobic interactions. In the 4th chapter, the changes in the rheological behaviour during the heat-induced gelling process of mixed systems of whey proteins (native or hydrolysed) and neutral polysaccharides (galactomannans) were studied at neutral pH and ionic force 220 mM. The rheological properties of final gels were studied as a function of polysaccharide concentration. Using microscopic techniques (optical microscopy and confocal laser scanning microscopy), thermodynamic incompatibility between the two polymers, inducing segregative phase separation, was observed. When phase separation and gelling processes occur simultaneously the rheological properties of mixed gels are greatly influenced because phase separation favour the protein gelling phase concentration but, at the same time, decreases its connectivity. The quantification of the water (and solutes) excluded during the gelling process (syneresis) permits to verify that, when polysaccharide is present during the gelling process, syneresis is less severe.
Fundação para a Ciência e a Tecnologia (FCT) - Projecto (POCTI/QUI/36452/2000) - Instituto de Ciências e Tecnologia Agrárias e Agro-Alimentares.