Dissertations / Theses on the topic 'Tartaric acid'
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Xie, Wei. "Thermodynamic and structural studies of aqueous chelating agents and their metal complexes at various temperatures and pressures : diethylenetriaminepentaacetic acid (DTPA) and tartaric acid /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0030/MQ47491.pdf.
Full textMhatre, Bharat Suresh. "Super-enantiospecific Autocatalytic Decomposition of Tartaric Acid and Aspartic Acid on Cu Surfaces." Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/232.
Full textBasaran, Tolga Yener. "Ion Exchangers In The Recovery Of Tartaric Acid From Aqueous Solutions." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607367/index.pdf.
Full textpKa1, pKa1 <
pH <
pKa2, and pKa2 <
pH for weakly basic resin, and in the pH ranges pH <
pKa1, pKa1 <
pH <
pKa2 for strongly basic resin at each concentration. Results show that the pH of the solution is a more important parameter than the initial concentration that affects the ion exchange equilibrium. Also, Langmuir and Freundlich isotherms were plotted, and it was shown that they were in good agreement with the experimental data especially for the systems that are at low total ion concentrations.
Bakka, Thomas Aleksander. "Synthesis and Mechanistic Studies of Optically Active Tartaric Acid Based Surfactants." Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20995.
Full textLopez, Martinez Marco Antonio. "Studies of tartaric acid modified nickel supported catalysts for enantioselective hydrogenation reactions." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1491/.
Full textHayes, Monty. "Chiral and racemic calix[6]arenes and their self-assembly /." View online, 2008. http://ecommons.txstate.edu/bchemtad/5.
Full textWade, Charles. "Studies towards the total synthesis of isoavenaciolide and the development of the amino tartrate aldol reaction." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341816.
Full textJapu, Cristina. "Cyclic derivatives of D-glucose and tartaric acid as building blocks for renewable polyesters." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/284660.
Full textEn esta Tesis se han sintetizado mediante reacción de policondensación en masa tres series de copoliesteres aromáticos derivados del poli(etilen tereftalato) (PET), poli(butilen tereftalato) (PBT) y poli(hexametilen tereftalato) (PHT) en los que se han sustituido parcial o totalmente las unidades tereftalicas o las unidades oxialquilénicas por diácidos y dioles cíclicos y bicíclicos obtenidos por derivatización de monómeros de origen natural como son el ácido tartárico y la D-glucosa. También se han sintetizado mediante policondensación en masa y en disolución por vía enzimática una serie de copoliesteres alifáticos derivados del poli(butilen sebacato) en los que las unidades oxibutilénicas y sebácicas se han reemplazado por dioles y diácidos bicíclicos derivados de la D-glucosa. Todas las series se han caracterizado espectroscópicamente mediante FTIR y RMN en disolución. Mediante RMN de 1H se ha determinado la composición de los copolímeros. Por otro lado mediante RMN de 13C se ha estudiado la microestructura de los mismos. Dicho estudio reveló que todos los copolímeros eran al azar. Los pesos moleculares determinados mediante cromatografía de permeabilidad en gel y viscosimetría capilar resultaron ser aceptables, aunque en todos los casos disminuían a medida que aumentaba el contenido del monómero de origen renovable. Las propiedades térmicas se han evaluado mediante calorimetría diferencial de barrido (DSC) y análisis termogravimétrico. Se ha observado que la estabilidad térmica no se ve apenas afectada cuando la sustitución se realiza sobre la unidad oxialquilénica y que por otro lado desciende cuando es la unidad tereftálica la sustituida. Los nuevos copolímeros presentaron temperaturas de transición vítrea superiores, observándose que este aumento era superior en los copolímeros que incorporaban el diol o el diácido bicíclico derivado de la D-glucosa que en los que incorporaban el diol o el diácido monociclico derivado del ácido tartárico. Los copolimeros eran por lo general menos cristalinos, menos cristalizables y con temperaturas de fusión inferiores. La estructura cristalina de los mismos determinada mediante difracción de rayos-X era semejante a la de los homopolimeros PET, PBT y PHT. Se ha estudiado la degradabilidad hidrolitica y la biodegradabilidad de todos ellos mediante medidas de pérdida de peso, pesos moleculares, microscopía electrónica de barrido (SEM), observándose un aumento de ambas propiedades para los nuevos copolímeros.
Morello, Alessandro. "Influence of ph and temperature on metatartaric acid efficiency in white wine tartaric stabilization." Master's thesis, ISA/UL, 2012. http://hdl.handle.net/10400.5/8625.
Full textThe sensitivity of metatartaric acid (MA) to high temperatures is the main limit for its actual use in enology. For this reason MA is generally used only for ready-to-drink wines that are stored for few months in bottle. The objective of this work was to obtain more information about the use of MA in order to prevent tartaric salts precipitation in wine by monitoring its effectiveness along the time. Tartaric stability was followed in a white wine during a ten-week experiment. 10 g/Hl of MA was added to wines with different five pH values, namely 3.0, 3.2, 3.5, 3.7 and 3.9 at room temperature (20°C), and to wines at original pH of 3.2 under three different temperatures commonly found in real storage conditions, precisely 12°C, 20°C and 35°C. To monitor tartaric stability we used a test based on the electrical conductivity developed by Boulton (1983). At the end of the experiment we found both a pH and a temperature effect. It was found a polynomial relation (R2 = 0,85) between tartaric stability and pH. The highest the pH, the highest the instability and the shortest the protection against tartrates precipitation. Furthermore, over 20°C we observed a rapid general decrease of MA effectiveness and that there was a linear relation (R2 = 0,99) between temperature and tartaric stability, so that we can affirm that the highest the temperature, the higher the wine instability; this is probably due to a faster MA hydrolysis. Metatartaric acid is surely able to prevent tartrates precipitation, but since in our experimental conditions it could not protect the wine for longer than one month, we would suggest extreme prudence about its use especially during long storage periods
Guadagnin, Hellen Costerano. "Corrosion resistance study of AA2524 anodized in sulphuric-tartaric acid and sealed with hybrid coatings." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-20072017-152947/.
Full textLigas de alumínio são muito utilizadas na indústria aeronáutica por serem materiais leves e altamente resistentes. Porém, essas ligas são particularmente sensíveis à corrosão localizada em meios que contêm cloretos, e precisam de sistemas robustos de proteção. Uma das metodologias de proteção consiste em anodização. A camada produzida aumenta a resistência à corrosão e também serve como sítio de ancoragem para aplicação de revestimentos orgânicos. A anodização crômica tem sido usualmente empregada na indústria aeronáutica. No entanto, como compostos contendo íons cromato são tóxicos para a saúde e para o meio-ambiente, tratamentos de superfície à base de cromo serão proibidos na indústria espacial em um futuro próximo. Anodização em banho de ácido sulfúrico-tartárico (TSA) é uma alternativa promissora e ambientalmente compatível, a qual já está sendo usada industrialmente com apropriada proteção à corrosão e adesão para pintura. Este estudo tem como objetivo propor um tratamento utilizando um revestimento híbrido sol-gel para melhorar a resistência à corrosão da liga AA2524 anodizada em TSA e que mantenha sua compatibilidade com revestimentos orgânicos. Para isso, camadas anodizadas de alumínio (CAA) foram produzidas em diferentes voltagens e protegidas por camada de híbrido sol-gel obtida pela hidrólise de tetraetilortosilano (TEOS) e glicidóxipropiltrimetóxisilano (GPTMS) em solução com alto teor de água e aplicada pela técnica de dip-coating. A avaliação da resistência à corrosão foi realizada através de espectroscopia de impedância eletroquímica (EIS) em NaCl 0,1 mol.L-1 e por exposição à câmara de névoa salina (norma ASTM B117-11). A morfologia da camada porosa foi investigada por MEV e a espectroscopia de emissão óptica por descarga luminescente (GDOES) foi empregada para avaliar a distribuição do híbrido sol-gel no interior dos poros da camada porosa. As caracterizações por MEV confirmaram que as propriedades da camada (distribuição dos poros, porosidade e espessura) são fortemente dependentes das condições de anodização, e a composição em profundidade obtida por GDOES mostrou que o revestimento híbrido penetrou nos poros da camada anodizada. As duas técnicas de caracterização mostraram uma cobertura ineficiente da camada sol-gel para as amostras anodizadas nas voltagens mais elevadas, provavelmente devido à deposição insuficiente do híbrido. Os testes de EIS com duração de até 1008 h (42 dias) mostraram que, independentemente da voltagem de anodização empregada, a camada anódica coberta com sol-gel ficou estável ocorrendo apenas pequenas evoluções dos diagramas com o tempo de imersão. Além do mais, as amostras protegidas com o revestimento híbrido apresentaram maiores valores de módulo de impedância em baixa frequência do que as amostras anodizadas em TSA e hidrotermicamente seladas (HTsed) usadas como referências. Essa tendência foi confirmada pelo ajuste com circuitos elétricos equivalentes (EEC) dos resultados de EIS que também mostrou que a aplicação do sol-gel híbrido torna mais difícil a penetração do eletrólito agressivo nos poros da camada anodizada quando comparada com as amostras HTSed, e indicou melhor desempenho anticorrosivo para a amostra anodizada em 16 V. Esses resultados foram confirmados pelos testes de névoa salina. A investigação do envelhecimento da solução de sol-gel mostrou pouca mudança na viscosidade da solução de hidrólise em duas semanas de testes e que os revestimentos híbridos aplicados a partir dessas soluções foram estáveis e promoveram boa proteção à corrosão para as amostras anodizadas em TSA, com melhora das propriedades anticorrosivas após 168 h de envelhecimento. Testes preliminares realizados com revestimento orgânico livre de solvente (epóxi) indicaram boa compatibilidade deste com o revestimento híbrido TEOS-GPTMS. O revestimento epóxi propiciou valores de módulo de impedância elevados e estáveis e também boa estabilidade após exposição à câmara de névoa salina quando aplicado sobre o revestimento híbrido aplicado sobre a liga 2524.
Lorenzo, Maria Ortega. "Complexities and dynamics of the enantioselective site in heterogeneous catalysis : tartaric acid and methylacetoacetate on Cu(110)." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366724.
Full textCoetzee, Zelmari. "Site and vintage response of malic and tartaric acid in Vitis vinifera L. cv’s Cabernet Sauvignon and Sauvignon blanc." Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85736.
Full textENGLISH ABSTRACT: Acids are one of the major components that originate largely from the berry, that are found in wine, and that influence the sensory perception. The presence of organic acids in adequate concentrations in the grape berry, of which tartaric- and malic acid are the main organic acids present, is important as this determines the potential of a must to produce a good and stable wine. The effect of temperature on the organic acid content of the must is widely discussed with higher temperatures in general being associated with lower quantities of organic acids present in the juice, and lower temperatures during ripening associated with higher quantities, specifically in the case of malic acid. Due to the topographical diversity of the Stellenbosch Wine of Origin district and the closeness of the ocean and the occurrence of sea breezes, the mesoclimate differs greatly over short distances. Sixteen sites, consisting of eight Sauvignon Blanc and Cabernet Sauvignon sites respectively, were selected from a broader terroir study site network. Three vintages with complete climatic datasets were selected for vintage comparisons. Climate in the study area was monitored on differing scales, and data from a weather station network, as well as from mesoclimatic dataloggers within the sites were available. The available data was firstly compared to determine the variability of the data, not only between the two climatic scales, but also between the sites. Different climate classification indices and parameters available in literature were thereafter compared and evaluated for the best representation in this area. The Huglin index was found to be a better representation regarding the thermal climatic indices. Due to the great differences between temperatures noted for the mesoclimatic loggers and the nearest automatic weather station, the use of mesoclimatic logger data was preferred, and is advised in future studies where this scale of data is available. Malic and tartaric acid has a definite synthesis period up until véraison, after which the content of tartaric acid remains constant in the berry and the content of malic acid decreases until harvest due to mainly respiration. The temperature data was therefore separated in a synthesis period from flowering to véraison, and a ripening period from véraison to harvest. In this study, clear differences were firstly seen in the climate as expected, not only between sites per vintage, but in addition between vintages and between vintages per site. The phenological differences between the sites could be largely attributed to the differences in temperature as phenology and temperature was found to be highly correlated in this study. Differences in the ripening parameters were noticed in addition to the contents of the organic acids between sites, although no definite contribution of temperature was shown to affect the contents of these compounds at either véraison or harvest. These differences may be attributed to other factors such as the soil water content and the canopy architecture. In addition, these factors all contribute in differing percentages to the differences found in the contents per site. It was found though that temperature can be used as an indicator of the organic acid content in the grape berry, considering that the temperature data is available on a mesoclimatic scale, separated in a synthesis and period of degradation, and the number of hours within the temperature thresholds are determined. Differences seen in the organic acid contents can however not only be attributed to the differences in topography and the temperature as discussed in this study.
AFRIKAANSE OPSOMMING: Sure is belangrike druifkomponente wat grootliks hul oorsprong in die korrel het, in die wyn voorkom, en die sensoriese persepsie van die wyn beïnvloed. Die voorkoms van organiese sure in genoegsame konsentrasies in die korrel, waarvan wynsteensuur en appelsuur die hoof organiese sure is, is belangrik aangesien dit die potensiaal van die sap om ʼn goeie en stabiele wyn te produseer, bepaal. Hoe temperatuur die inhoud van organiese sure in die druiwesap affekteer is gereeld onder bespreking, met hoër temperature in die algemeen geassosieer met ʼn laer inhoud van organiese sure, terwyl laer temperature geassosieer word met ʼn hoër inhoud van organiese sure in die sap, veral in die geval van appelsuur. As gevolg van die topografiese diversiteit van die Stellenbosch Wyn van Oorsprong distrik, asook die nabyheid van die oseaan met die gepaardgaande voorkoms van die seebries, verander die mesoklimaat aansienlik oor klein afstande in hierdie area. Vir die studie was sestien wingerde, wat bestaan het uit agt Sauvignon Blanc en agt Cabernet Sauvignon wingerde, geselekteer vanuit ʼn groter terroir studie. Verder was drie seisoene, met volledige klimaatsdatastelle, geselekteer vir die vergelyking van data tussen die seisoene. Klimaat was op verskillende skale binne die studie area gemonitor en data van ʼn weerstasie netwerk, sowel as van mesoklimaat dataversamelaars binne die wingerde, was beskikbaar. Die beskikbare datastelle was vergelyk, asook geëvalueer, om die mees verteenwoordigende datastel vir die area te bepaal. Met die oorweging van die termiese indekse was daar gevind dat die Huglin indeks beter verteenwoordigend van die area was. Verder, as gevolg van die groot verskille wat gevind is tussen die temperature gemeet met die mesoklimaat dataversamelaars en die naaste outomatiese weerstasie, was daar besluit dat die gebruik van die mesoklimaat data verkies is en is dit ook aan te beveel vir die gebruik in toekomstige navorsing indien die tipe data beskikbaar is. Wynsteen- en appelsuur het beide ʼn definitiewe sintese periode tot en met véraison, waarna die hoeveelheid wynsteensuur in die korrel relatief konstant bly en die hoeveelheid appelsuur afneem hoofsaaklik as gevolg van respirasie. Die temperatuur data was dus verdeel in ‘n periode van sintese vanaf blom tot en met véraison, en ʼn rypwordingsperiode vanaf véraison tot en met oes. In hierdie studie was daar eerstens groot verskille waargeneem in die klimaat soos wat daar verwag is. Hierdie verskille was nie net waargeneem as tussen die seisoene nie, maar ook tussen die wingerde binne ʼn seisoen. Die fenologiese veskille tussen die wingerde wat ook waargeneem is, kon hoofsaaklik aan die verskille in die temperatuur toegeskryf word en ʼn goeie korrelasie tussen temperatuur en fenologie is opgemerk. Merkwaardige verskille in die rypwordingsparameters, asook in die inhoud van die organiese sure, was waargeneem, alhoewel die bydrae van temperatuur op die inhoud van hierdie komponente by véraison of oes nie as definitief getoon is nie. Dit kan toegeskryf word aan die bydrae van ander faktore, soos byvoorbeeld die grondwaterinhoud en die lowerargitektuur, op die inhoud van hierdie komponente. Die addisionele faktore dra egter in verskillende persentasies by tot die verskille waargeneem tussen die wingerde.
Gouteyron, Antoine. "Nouveaux monomères biosourcés à haute rigidité à destination des revêtements polyesters." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10266.
Full textPolyester binders are the main components of the coatings and materials used nowadays. They are obtained by the condensation of polyols, polyacids and monoacids. Evolving regulations (REACH) and the public being increasingly sensitive to the origin and impact of the products it consumes, petro based compounds substitution to renewable raw materials seems obvious. New polyesters, mainly composed of biobased monomers were therefore synthesized. The L-(+)-tartaric acid was mainly studied, this quad-functional monomer being barely used in materials chemistry, although available in large quantities and inexpensive. To characterize polyesters, various tests used in the industry have been established, the physicochemical characteristics may vary from one application to another. Different crosslinking mechanisms have also been explored to adapt polyesters constraints of resistance and drying. These mechanisms include the reaction between the hydrazide and methyl ketones, as well as the derivatives of Boron and hydroxyl at room temperature. The solubility of the synthesized polyesters was also studied in order to obtain a water soluble material capable of becoming insoluble after crosslinking and drying
Wu, Ruizhi. "Enzymatic and chemical synthesis of polyesters and polycarbonates derived from L-tartaric acid and synthesis of polycaprolactones initiated by cavitands." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0002972.
Full textJones, Lee. "An investigation into the effect of a chiral adsorbate on surface magnetism using spin-resolved electron spectroscopy : tartaric acid on Ni{110}." Thesis, University of Liverpool, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433770.
Full textReinicker, Aaron D. "High Throughput Study of the Structure Sensitive Decomposition of Tartaric and Aspartic Acid on Surfaces Vicinal to Cu(111) and Cu(100)." Research Showcase @ CMU, 2015. http://repository.cmu.edu/dissertations/572.
Full textKniel, Kalmia Elisabeth. "Evaluation of chemical treatments and ozone on the viability of Cryptosporidium parvum oocysts in fruit juices." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/27243.
Full textPh. D.
Eißmann, Diana. "Organische Linkermoleküle auf Basis natürlicher Hydroxycarbonsäuren zum Aufbau homochiraler poriger Festkörperstrukturen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2011. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-77001.
Full textButch, Christopher J. "The role of glyoxylic acid in the chemistry of the origin of life." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54263.
Full textOwens, Samuel Britt. "Transition metal complexes of bis(phosphorus) donor ligands derived from multifunctional diols synthesis, isomerization, cation binding, and catalysis /." Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2008p/owens.pdf.
Full textAdditional advisors: Houston Byrd, Chris Lawson, Sadanandan Velu, Charles Watkins. Description based on contents viewed Feb. 9, 2009; title from PDF t.p. Includes bibliographical references.
Jacquet, Antoine. "Capsules hélicoïdales d’oligoamides aromatiques : détecteurs moléculaires pour le dosage d’acides organiques du vin." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0921/document.
Full textSome relevant wine small molecular components can be selectively recognized by foldamer capsules – artificial oligomeric compounds able to fold into well-defined objects possessing an inner cavity. In recent years, selective and high affinity receptors for fructose, tartaric acid and malic acid have been reported. Here, a new methodology, using solid phase synthetic techniques, for the preparation of a gluconic acid receptor will be discussed. To transform these receptors into sensors, a fluorescent moiety has been incorporated in the binding site. A proof of concept has been achieved using a fluorescence titration of tartaric acid. Indeed, when the guest is encapsulated, a modification of the fluorescence emission is observed. Finally, these fluorescent receptors have been anchored to silica surfaces and pave the way to the development of mobile detection devices. Such sensors could be useful to the wine industry to ensure proper control of biological processes for example during fermentation
Simões, Madalena. "Estabilização tartárica em vinhos." Master's thesis, Universidade de Évora, 2014. http://hdl.handle.net/10174/13050.
Full textPoot, Thirza. "Tuned sustainable anodic coatings for reduced ice adhesion." Thesis, Linköpings universitet, Molekylär ytfysik och nanovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-158214.
Full textDuchêne, Eric. "Une exploration des possibilités génétiques pour l'adaptation de la vigne au changement climatique." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAJ059/document.
Full textThe effects of climate change have already been observed on the grapevine : advance of phenological stages, increase in the alcohol content of the wines, excessive decrease of their acidity. Breeding new varieties is one of the possible means of adaptation. I have characterized the phenotypic variability of 120 genotypes, offspring from crossings between Riesling (RI) and Gewurztraminer (GW)for (1) the developmental stages, described with heat sums (2) the ability to accumulate sugars in the berries (3) the parameters for acidity. The use of DNA molecular markers allowed the detection of quantitative trait loci (QTLs) for all the traits studied. The main conclusion is that the genetic variability for the parameters determining the acidity of the berries is the most promising for the adaptation of grapevine cultivation to climate change
SCHWARTZ, VERONIQUE. "Protection des cetones insaturees steroides en position 3 par des cetals tartriques." Nice, 1995. http://www.theses.fr/1995NICE4832.
Full textThomson, C. C. "Rootstock and canopy density effects on grape berry composition : organic acid composition, potassium content and pH." Lincoln University, 2006. http://hdl.handle.net/10182/772.
Full textRosa, Inês Feitinha Severino da Silva e. "O uso do poliaspartato de potássio na estabilização tartárica de vinhos." Master's thesis, Universidade de Évora, 2019. http://hdl.handle.net/10174/26199.
Full textLautrette, Guillaume. "Capsules hélicoïdales auto-organisées par repliement d’oligoamides aromatiques pour la reconnaissance moléculaire." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14850/document.
Full textMolecular recognition is one of the major challenges of supramolecular chemistry. Here, we present the design, synthesis and study of helical capsules properties self-organised by aromatic oligoamide folding. These receptors consist of oligomeric chains that fold into a helical conformation and comprise of a sequence of units which code for different diameters. Oligomeric folding defines a cavity which can recognize guests. The great modularity of the sequences has allowed a controlled evolution of foldamer structure resulting in the selective and predict recognition of biological substrates. The phenomenon of encapsulation was demonstrated in solution by NMR and CD spectroscopy and in the solid state by X-ray diffraction
Cito, Antonia Maria das Graças Lopes. "Rotas sinteticas exploratorias a partir do acido L-(+)-tartarico e D-manitol." [s.n.], 1994. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250182.
Full textTese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica
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Doutorado
Alberton, Elga Heloisa. "Influência de chalconas análogas, xantonas e monossacarídeos na glicemia em modelo experimental animal." Florianópolis, SC, 2007. http://repositorio.ufsc.br/xmlui/handle/123456789/89857.
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O objetivo deste trabalho foi estudar o efeito de chalconas análogas (derivadas do 3,4-metilenodióxi-benzaldeído, 2-naftaldeído ou xantoxilina), monossacarídeos (ácido glicônico e tartárico), extrato bruto etanólico da Polygala paniculata, fração acetato de etila (AcEt) da Polygala cyparissias (que contém xantonas), na glicemia de ratos normoglicêmicos, hiperglicêmicos e diabéticos induzidos com aloxano. Para a comparação da curva de tolerância à glicose dos compostos testados, foi realizada a curva de substâncias com efeito hipoglicemiante conhecido (insulina e tolbutamida). As glicemias foram determinadas pelo método da glicose-oxidase. As chalconas análogas foram administradas na dosagem de 5, 10 e 15 mg/kg em ratos hiperglicêmicos. As coletas de sangue foram realizadas nos tempos zero, 15, 30, 60, 120 e 180 minutos (curva de tolerância à glicose). Três séries de chalconas foram testadas, sendo que as chalconas derivadas do 3,4-metilenodióxi-benzaldeído (compostos 03, 04, 05, 07, 09 e 10) e naftaldeído (compostos 12, 13 e 14), apresentaram atividade hipoglicemiante, enquanto que as chalconas derivadas da xantoxilina não demonstraram qualquer efeito na glicemia, sugerindo assim, que substituintes na posição 3#e/ou 4# são essenciais para a atividade hipoglicêmica destes compostos. Os substituintes no anel A e B do núcleo das chalconas determina a potência e a eficiência na atividade hipoglicemiante destes novos compostos, quando comparados à insulina e à tolbutamida. O ácido glicônico foi administrado via oral nas dosagens de 25, 50, 100, 200, 400 e 800 mg/kg de peso corporal em ratos normoglicêmicos; hiperglicêmicos e diabéticos, via oral ou intraperitoneal. O ácido tartárico foi administrado nas dosagens de 100 mg/kg e 400 mg/kg via oral, em ratos normoglicêmicos e ratos hiperglicêmicos. As coletas de sangue de animais normoglicêmicos e diabéticos foram realizadas nos tempos zero, 1, 2 e 3 horas para o estudo da curva de doseresposta em função do tempo e nos tempos de zero, 15, 30, 60, 120 e 180 minutos para o estudo da curva de tolerância à glicose nos ratos hiperglicêmicos. Não houve mudança significativa nas glicemias de ratos normoglicêmicos tratados com ácido glicônico e ácido tartárico quando comparados com o tempo zero. Na curva de tolerância à glicose ocorreu aumento significativo na glicemia de animais tratados com ácido glicônico (400 mg/kg) nos tempos 15, 30, 60 e 120 minutos, e animais tratados com ácido tartárico (400 mg/kg) nos tempos 120 e 180 minutos. O ácido glicônico não alterou a glicemia de ratos diabéticos induzidos com aloxano. Estes resultados sugerem que o ácido glicônico e o tartárico não atuam como secretagogo de insulina e não possuem ação insulinomimética. O EBEtOH da P. paniculata foi administrado nas dosagens de 400, 800 e 1200 mg/kg em ratos diabéticos e hiperglicêmicos. A fração AcEt da P. cyparissias foi administrada na dosagem de 800 mg/kg em ratos diabéticos e hiperglicêmicos. A P. paniculata (EBEtOH) não alterou significativamente a glicemia de ratos diabéticos induzidos com aloxano e também a curva de tolerância à glicose nas dosagens testadas. A P. cyparissias (AcEt) não reduziu a glicemia de ratos diabéticos, mas promoveu diminuição significativa da glicemia nos tempos de 15 e 30 minutos, quando comparados ao controle hiperglicêmico. Assim, a fração rica em xantonas da P. cyparissias demonstrou potencial atividade hipoglicemiante, enquanto que a P. paniculata (EBEtOH) não demonstrou nenhuma ação anti-hiperglicêmica, anti-diabética ou insulinomimética nestes testes realizados. The objective of this investigation was to study the effect of chalcone analogues (derived from 3,4-methylenedioxy-benzaldehyde, 2-naphthaldehyde or xanthoxylin), monosaccharides (gluconic and tartaric acids), the crude ethanolic extract of Polygala paniculata, and the ethyl acetate fraction (EtAc) of Polygala cyparissias (that contains xanthones) on glycemia in normoglycemic rats, hyperglycaemic rats, and in alloxan-induced diabetic rats. The glucose tolerance curve of the compounds being tested was compared with a curve obtained using substances with a known hypoglycaemic effect (insulin and tolbutamida). Glycemia was determined by the glucose-oxidase method. The chalcone analogues were administered at doses of 5, 10 and 15 mg/kg in hyperglycaemic rats. Blood was collected at time zero and at 15, 30, 60, 120 and 180 minutes (glucose tolerance curve). Three series of chalcones were tested, those derived from 3,4-methylenedioxy-benzaldehyde (compounds 03, 04, 05, 07, 09 and 10) and naphthaldehyde (compounds 12, 13 and 14) that presented hypoglycaemic activity, and chalcones derived from xanthoxylin, which did not present any effect on glycemia, suggesting that substituents in the 3# and/or 4# positions are essential for the hypoglycaemic activity of these compounds. Substituents in the A and B ring of the nucleus of the chalcones determine the potency and efficiency in hypoglycaemic activity of these new compounds compared to insulin and tolbutamide. Gluconic acid was administered by oral route at doses of 25, 50, 100, 200, 400 and 800 mg/kg body weight in normoglycemic rats, and via oral or intraperitoneal route in hyperglycaemic and diabetic rats. Tartaric acid was administered at oses of 100 mg/kg and 400 mg/kg via oral route in normoglycemic and hyperglycaemic rats. Blood was collected from normal and diabetic animals at time zero, and then at 1, 2 and 3 hours to construct a dose-response curve as a function of time, and at time zero, then at 15, 30, 60, 120 and 180 minutes to produce a glucose tolerance curve in hyperglycaemic rats. There was no significant change in the glycemia of normoglycemic rats treated with gluconic acid and tartaric acid compared to time zero. In the glucose tolerance curve for animals treated with gluconic acid (400 mg/kg) there was a significant increase in glycemia at 15, 30, 60 and 120 minutes, while in animals treated with tartaric acid (400 mg/kg) this was present at 120 and 180 minutes. Gluconic acid did not change the glycemia in alloxan-induced diabetic rats. These results suggest that gluconic and tartaric acids do not act as insulin secretagogues and do not possess an insulinomimetic action. The EBEtOH of P. paniculata was administered at doses of 400, 800 and 1200 mg/kg in diabetic and hyperglycaemic rats. The EtAc fraction of P. cyparissias was administered at a dose of 800 mg/kg in diabetic and hyperglycaemic rats. P. paniculata (EBEtOH) did not significantly alter glycemia in alloxan-induced diabetic rats nor did it affect the glucose tolerance curve at the doses tested. P. cyparissias (EtAc) did not reduce glycemia in diabetic rats, although it did cause a significant decrease in glycemia at 15 and 30 minutes when compared to the hyperglycaemic control. In summary, the xanthones-rich fraction of P. cyparissias exhibited potential hypoglycaemic activity, while P. paniculata (EBEtOH) did not present any antihyperglycaemic, anti-diabetic or insulinomimetic action in the tests.
DeBolt, Seth. "Tartaric acid biosynthesis in plants." 2006. http://hdl.handle.net/2440/57333.
Full textTo summarise, research presented in this thesis extends the understanding of grape berry metabolism by characterising dual metabolic fates for AA. Moreover, the success of combining transcriptional and metabolic profiling towards targeting a specific pathway in non-model plants was demonstrated. The key result of this research was the discovery of L-idonate dehydrogenase, which acts to oxidise L-idonate in the tartaric acid synthetic pathway. Furthermore a grape transketolase capable of carrying out a second step in the pathway was isolated and part characterised. Finally, these data present results of relevance to the applied practice of viticulture, because they reveal a differential impact of light on specific organic acids, relative to others.
http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1241843
Thesis (Ph.D.) -- University of Adelaide, School of Agriculture and Wine, 2006
Lin, Fu-Ming, and 林福明. "Preparation and application of chitosan-oxalic acid and chitosan-tartaric acid gel beads." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/45142740967566788041.
Full text明志科技大學
化學工程研究所
99
Chitosan-oxalate (CO) and chitosan-tartrate (CT) adsorbents, prepared by freeze-dried and oven-dried, were used for treatment of Cu(II) ion from aqueous solution. The effects of the initial pH value of the solution, contact time, temperature and the initial Cu(II) ion concentration on the adsorption of Cu(II) ion were investigated. The characterization of CO and CT adsorbents were investigated by IR, XRD and TGA. The maximum adsorption amount was observed at pH 5 for both CO and CT adsorbents. The adsorption isotherms were better fitted by the Langmuir equation. The maximum theoretical Cu(II) ion adsorption capacities of CO and CT adsorbents prepared by freeze-dried were 227.27 mg/g and 175.44 mg/g respectively. The adsorption kinetics were well described by the pseudo-second order equation, indicating that chemical adsorption is the rate-limiting step for the CO and CT adsorbents. The negative values of gibbs free energy of adsorption indicated the spontaneous adsorption of Cu(II) ion on the CO and CT adsorbents, while the positive enthalpy change indicated an endothermic adsorption process.
Usui, Fusao. "Interaction of sodium bicarbonate with tartaric acid under compressed condition." 1985. http://catalog.hathitrust.org/api/volumes/oclc/12728166.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 110-112).
Ranzenigo, Anna. "Synthesis of hydroxylated indolizidines and diamino suberic acid derivatives: use of tartaric acid and other approaches." Doctoral thesis, 2022. http://hdl.handle.net/2158/1286510.
Full textDhamaniya, Sunil. "Synthesis and characterization of polyesters based on tartaric acid deriv atives." Thesis, 2012. http://localhost:8080/xmlui/handle/12345678/3153.
Full textChandrakumar, A. "Synthesis And Applications Of 1,4-Diketones And Y-Oxobutyramides Derived From Tartaric Acid." Thesis, 2008. https://etd.iisc.ac.in/handle/2005/839.
Full textChandrakumar, A. "Synthesis And Applications Of 1,4-Diketones And Y-Oxobutyramides Derived From Tartaric Acid." Thesis, 2008. http://hdl.handle.net/2005/839.
Full textChuang, Ya-ling, and 莊雅玲. "Electrochemical polymerization of aniline on Au(111) and Au(100) in camphor-sulfonic acid and tartaric acid." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/50695091619108506870.
Full text國立中央大學
化學研究所
99
In situ scanning tunneling microscopy (STM) and cyclic voltammetry (CV) have been used to explore the adsorption and electropolymerization of aniline on ordered Au(111) and Au(100) electrodes in 0.1 M organic acid of D-(+)- or L-(-)-camphor-sulphonic acid or D-(-)- and L-(+)-tartaric acid (TA). Molecular resolution STM imaging revealed aniline molecules were arranged differently in D-(+)- and L-(-)-camphor-sulphonic acid. The coverages and structures of aniline and coadsorbed anions could vary with the potential of gold electrodes. D-(+)- and L-(-)-camphor-sulphonic acid were able to induce 3-D helical molecular conformations of polyaniline at E > 0.95 V. On the other hand, different structures were obtained on Au(111) and Au(100) surfaces in electrolyte solutions containing aniline and D-(+)- or L-(-)-tartaric acid. Electropolymerization aniline also produced polyaniline wires with helix-like shape, which could be induced by the coadsorbed D-(-)- and L-(+)-tartaric acids. Interestingly, aniline molecules were organized differently on Au(100) electrode in D-(-)- and L-(+)-tartaric acids. Polyaniline grew linearly along the √10 direction in D-(-)- tartaric acid, followed by re-configuration into helix-like shape as oxidation of aniline continued. My studies show that chiral dopants of organic acids for polyaniline could induce specific conformational on Au(111) and Au(100) electrode surfaces. STM imaging has unveiled helical-shaped polyaniline chain in the presence of D- and L-organic acid, which could yield some fundamental insights into its potential applications in fabrication of chemical and biological sensors, chiral catalysis, pharmaceutics, and enantioselective separation.
"Studies towards metal-complex catalyzed epoxidation." 2013. http://library.cuhk.edu.hk/record=b5884494.
Full textThesis (M.Phil.)--Chinese University of Hong Kong, 2013.
Includes bibliographical references (leaves 81-89).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts also in Chinese.
Santagata, Nancy Marie. "Stereochemical effects on the organizational and electronic structure of the tartaric acid/Ag(111) system." 2009. http://www.lib.ncsu.edu/theses/available/etd-05272009-113006/unrestricted/etd.pdf.
Full textBali, Amit K. "Alkynones Derived from Tartaric Acid : Efficient Building Blocks for the Synthesis of Macrolactone Natural Products." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3790.
Full textBali, Amit K. "Alkynones Derived from Tartaric Acid : Efficient Building Blocks for the Synthesis of Macrolactone Natural Products." Thesis, 2017. http://etd.iisc.ernet.in/2005/3790.
Full textMelino, Vanessa Jane. "Ascorbate metabolism in grape berries during development." Thesis, 2010. http://hdl.handle.net/2440/68714.
Full textThesis (Ph.D.) -- University of Adelaide, School of Agriculture, Food and Wine, 2010
Metri, Prashant K. "β-Keto Phoshonates from Tartaric Acid in the Total Synthesis of (+)-4-epi-gabosine A, (+)-dihydrokawain-5-ol, (-)-bengamide E and indetification of MPK-09 : A Small Molecule that Restores the Wild type Function of Mutant p53." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/4101.
Full textAmbardekar, Amogh. "Modifications in visco-elasticity of gluten diacteyl tartaric acid ester of monoglyceride (DATEM), ascorbic acid, urea and dithiothreitol and its effects on mixing and baking properties in commercial wheat flours." 2009. http://digital.library.okstate.edu/etd/Ambardekar_okstate_0664D_10538.pdf.
Full textStern, Ben, Carl P. Heron, T. Tellefsen, and M. Serpico. "New investigations into the Uluburun resin cargo." 2008. http://hdl.handle.net/10454/4797.
Full textBuckler, Joshua Neil Victor Timshell. "Stereoselective Syntheses of Certain Natural Products and their Analogues from Chiral-pool and Enzymatically-derived Building Blocks." Phd thesis, 2017. http://hdl.handle.net/1885/146534.
Full textSingh, Piyal. "Stereoselective synthesis of functionalized allenes, total synthesis of monticolides A and B, and towards the total synthesis of tulearin C." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5551.
Full textSá, Maria Manuela Gonçalves de. "Estratégias enológicas na gestão do processo de vinificação e estabilização." Master's thesis, 2020. http://hdl.handle.net/1822/72436.
Full textO presente trabalho foi elaborado no âmbito da dissertação de Mestrado em Tecnologia e Ciência Alimentar nas Caves Campelo S.A., e teve como principal objetivo acompanhar o processo completo de vinificação em vinhos verdes, nomeadamente das castas Alvarinho, Loureiro e Arinto. Pretendeu-se avaliar diferentes métodos de filtração e diferentes estabilizantes tartáricos de modo a obter os resultados mais benéficos para a empresa, efetuando-se ensaios de filtração e de estabilização tartárica. No primeiro caso, analisaram-se os parâmetros físico-químicos e por consequente a medição da turbidez no vinho não filtrado, procedendo-se em análise comparativa dos valores de turbidez e dos parâmetros FQ com os outros dois métodos em estudo, filtração por placas e por terras. Sendo a presença de cristais um dos fatores de rejeição do vinho por parte do consumidor, os ensaios de estabilização tartárica centraram-se na adição de ácido metatartárico e de carboximetilcelulose (CMC), analisando o efeito de cada um deles e o impacto nos parâmetros físico-químicos e sensoriais. Paralelamente à medição da condutividade elétrica (teste minicontacto) da CMC e do ácido metatartárico realizou-se um teste frio, no qual se monitorizaram os resultados durante trinta dias. A análise sensorial é um dos pontos cruciais quer na produção quer na sua aceitação do vinho. Para o efeito, as amostras foram provadas por um painel de cinco provadores. Os resultados obtidos permitiram concluir que os métodos de filtração testados conferem resultados satisfatórios surgindo, porém, alterações em determinados parâmetros físico-químicos. É possível inferir que a CMC e o ácido metatartárico previnem a precipitação tartárica, no entanto, o ácido metatartárico apresenta resultados mais vantajosos nas três castas. A adição dos estabilizantes tartáricos não evidenciou diferenças significativas nos parâmetros físico-químicos. A nível sensorial é possível verificar que cada casta apresenta um comportamento distinto face aos diferentes métodos de filtração/adição dos estabilizantes tartáricos.
The present work was carried out in the form of a curricular internship at Caves Campelo S.A. and its main objective was to follow the complete vinification process of vinhos verdes, namely Alvarinho, Loureiro and Arinto. The goal was to evaluate diferente filtration methods and different tartaric stabilizers in order to ascertain which one would yield the most beneficial results for the company. Accordingly, triplicate filtration and tartaric stabilization tests were performed. In the first case, the physicochemical parameters were analyzed, turbidity was measured in unfiltered wine and a comparative analysis of turbidity and CF parameters was conducted through plate filtration and Diatomaceous earth. Considering the presence of crystals is one of the factors of wine rejection by the consumer, the tartaric stabilization tests focused on the addition of metatartaric acid and carboxymethylcellulose (CMC), analyzing their effect and impact on the physical and chemical and sensory parameters. In parallel with the electrical conductivity (mini-contact test) measurement of CMC and metatartaric acid, a cold test was performed and the results were monitored for a period of thirty days. Sensory analysis of wines is one of the crucial points in both wine production and acceptance. To this purpose, the samples were tested by a panel of five tasters and the descriptive characteristics were evaluated on a radar diagram and the final evaluations on a bar graph. The results allow to conclude that plate filtration provides better wine clarification, although some alterations in certain physicochemical parameters may occur. It could also be inferred that CMC and metatartaric acid prevent tartaric precipitation. However, metatartaric acid shows more advantageous results in the three varieties tested. The addition of tartaric stabilizers revealed no significant differences in physicochemical parameters. At the sensory level, it can be concluded that each wine variety reacts differently to the filtration/addition methods of tartaric stabilize.
Kumar, S. Mothish. "Total Synthesis of Bio-active Natural Products Gabosines, Crassalactone C, Anamarine and Iriomoteolide 3a." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/2960.
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