Auswahl der wissenschaftlichen Literatur zum Thema „Protéines sériques du lait“
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Zeitschriftenartikel zum Thema "Protéines sériques du lait":
BOICHARD, D., A. GOVIGNON-GION, H. LARROQUE, C. MAROTEAU, I. PALHIÈRE, G. TOSSER-KLOPP, R. RUPP, M. P. SANCHEZ und M. BROCHARD. „Déterminisme génétique de la composition en acides gras et protéines du lait des ruminants, et potentialités de sélection“. INRAE Productions Animales 27, Nr. 4 (21.10.2014): 283–98. http://dx.doi.org/10.20870/productions-animales.2014.27.4.3074.
Boughellout, H., L. Benatallah und M. N. Zidoune. „Protéines du lait camelin et allergie aux protéines du lait de vache“. Revue Française d'Allergologie 55, Nr. 3 (April 2015): 216. http://dx.doi.org/10.1016/j.reval.2015.02.014.
PÉLISSIER, J. P., und B. RIBADEAU-DUMAS. „Synthèse des protéines du lait“. Reproduction Nutrition Développement 26, Nr. 2B (1986): 563–71. http://dx.doi.org/10.1051/rnd:19860404.
TROCCON, J. L., und R. TOULLEC. „Aliments d’allaitement pour veaux d’élevage. Remplacement de la poudre de lait écrémé par d’autres sources protéiques“. INRAE Productions Animales 2, Nr. 2 (10.05.1989): 117–28. http://dx.doi.org/10.20870/productions-animales.1989.2.2.4406.
Boughellout, H., Y. Choiset, H. Rabesona, J. M. Chobert, T. Haertle und M. N. Zidoune. „Lait camelin : nouvelle source de protéines pour enfants allergiques aux protéines du lait de vache ?“ Revue Française d'Allergologie 56, Nr. 4 (Juni 2016): 344–48. http://dx.doi.org/10.1016/j.reval.2015.08.011.
Sawadogo, Gerrmain J., A. Abouna, H. Hamadama und A. Maikano. „Principaux minéraux, protéines totales et leurs fractions dans le sérum du zébu Choa du Cameroun septentrional“. Revue d’élevage et de médecine vétérinaire des pays tropicaux 44, Nr. 4 (01.04.1991): 459–62. http://dx.doi.org/10.19182/remvt.9153.
De Ménibus, A. C., T. Guiddir, C. Billard, P. Poncet, M. A. Selva, H. Sénéchal, Y. Chantran und A. Nemni. „Protéines de lait de vache cachées“. Revue Française d'Allergologie 60, Nr. 4 (Juni 2020): 323. http://dx.doi.org/10.1016/j.reval.2020.02.074.
GELÉ, M., S. MINERY, J. M. ASTRUC, P. BRUNSCHWIG, M. FERRAND-CALMELS, G. LAGRIFFOUL, H. LARROQUE et al. „Phénotypage et génotypage à grande échelle de la composition fine des laits dans les filières bovine, ovine et caprine“. INRAE Productions Animales 27, Nr. 4 (21.10.2014): 255–68. http://dx.doi.org/10.20870/productions-animales.2014.27.4.3072.
RULQUIN, H., R. VÉRITÉ, J. GUINARD-FLAMENT und P. M. PISULEWSKI. „Acides aminés digestibles dans l’intestin. Origines des variations chez les ruminants et répercussions sur les protéines du lait“. INRAE Productions Animales 14, Nr. 3 (16.06.2001): 201–10. http://dx.doi.org/10.20870/productions-animales.2001.14.3.3740.
Gameel, A. A., E. M. E. Abu Elzein, F. M. T. Housawi, A. Agib und A. O. Ibrahim. „Observations clinico-pathologiques de l’ecthyma contagieux chez des agneaux infectés naturellement en Arabie Saoudite“. Revue d’élevage et de médecine vétérinaire des pays tropicaux 48, Nr. 3 (01.03.1995): 233–35. http://dx.doi.org/10.19182/remvt.9446.
Dissertationen zum Thema "Protéines sériques du lait":
Geagea, Hany. „Contrôle des phages dans le lactosérum : étude de leur protection par les protéines sériques et identification d'un déterminant génétique responsable de leur résistance thermique“. Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/28377.
The incorporation of whey protein concentrates (WPC) into cheese is a risky process due to the potential contamination with thermo-resistant phages of lactic acid bacteria (LAB). Furthermore, whey proteins can protect phages during heat treatment, thereby increasing the above risk. The objectives of this work were to understand this protective effect and to identify genetic determinant(s) responsible for the thermal resistance of lactococcal phages. First, the effect of pH and time of heating on the inactivation of lactococcal thermo-resistant phage P1532 (Sk1virus/936 group) was measured, at 95 ºC, in WPC and in three individual major whey components. The molecular structure changes of the tested proteins were also monitored by Fourier transform infrared (FTIR) spectroscopy. Phage inactivation results indicated that acidic conditions of WPC favor the destruction of dairy phages by heat treatment. Moreover, it revealed that the protective effect of whey proteins was pH and time dependent and was not restricted to one component. FTIR spectra suggest that the protection is related to protein molecular structures and to the level of protein aggregates. Then, to further investigate this protection, we used lactoferrin (LF) as a whey protein model as a result of its unique physicochemical properties. We combined FTIR and circular dichroism (CD) spectroscopies to monitor the structural conformational changes of LF. Phage inactivation results revealed a strong protective effect of LF on P1532 phage at pH 5 but none at pH 7. Spectroscopic analysis showed that LF was unfolded after heating at pH 7, while it preserved its tertiary and secondary structures when heated at pH 5. In sum, there is a direct correlation between the thermal stability of whey proteins and their ability to protect P1532 phage from heat treatment. The results obtained in this respect offer new tools to minimize the impact of the protective effect on lactococcal phages. In order understand the thermal resistance of LAB phages, we aimed to identify genetic determinant(s) responsible for the thermal resistance of lactococcal phages. After challenging CB14 heat-sensitive phage (Sk1virus/936 group) to low and high temperatures, two phages with increased thermal resistance were selected. Sequencing of their genome revealed a 120 bp deletion in the gene coding for the tape measure protein (TMP). The TMP protein sequences of mutant phages were compared with their homologues in other wild-type L. lactis phages with a wide diversity in heat stability. Comparative analysis of TMP proteins of other lactococcal phages identified the same deletions in the extremely heat-stable phages P680 and P1532. We propose that the TMP is, in part, responsible for the heat stability of the highly predominant lactococcal phages of the Sk1virus group. Identifying this genetic determinant for Sk1virus heat stability is a first step to understand the emergence of this group of thermostable phages, and may lead to improved control strategies in the cheese industry
Pichard, Patrick. „Effets des protéines de différents produits laitiers sur les concentrations sériques du cholestérol et des lipoprotéines chez le rat : valeur nutritionnelle de ces protéines laitières“. Paris 7, 1985. http://www.theses.fr/1985PA07F095.
Thill-Chardot, Valérie. „Étude de la dynamique de l'agrégation des micelles de caséines lors de l'acidification du lait : effet de la dénaturation thermique des protéines sériques“. Vandoeuvre-les-Nancy, INPL, 2004. http://www.theses.fr/2004INPL023N.
Understanding mechanisms of acidic milk gelation implies the knowledge of casein micelles aggregation and of the different steps leading to gel formation. Small angle static light scattering and diffusing wave spectroscopy (DWS), which is based on light scattering in turbid medium, were used in this study. Static light scattering measurements permitted to follow micelles aggregation steps in diluted media and to calculate the fractal dimension of acidic aggreptes formed. Results showed the formation of four successive particle populations. The first population corresponds to casein micelles and the others populations correspond to casein aggregates with increasing size. The fractal dimension value, determined from double logarithmic plots of intensity versus scattering wave vector (q) resulted in value around 1. 8, which reflects a diffusion limited cluster aggregation mechanisms (DLCA). By static light scattering, casein/whey proteins ratio and heat treatment of milk were shown to influence the growth kinetics of aggregates, but only heat treatment of milk modified fractal dimension leading to more porous aggregates. The DWS results showed that acid gelation of unheated milk occurred via a single-stage aggregation. The aggregation pH was measured at pH 4. 9 and the gelation pH was estimated at pH 4. 8
Najib, Mustapha. „Étude du procédé de fabrication et caractérisation des interactions moléculaires lors de la fabrication de la Qishta et évaluation de la stabilité du produit alimentaire“. Electronic Thesis or Diss., Université de Lille (2018-2021), 2020. http://www.theses.fr/2020LILUR057.
Qishta is a Lebanese dairy product obtained by heating whole milk for 2 to 3 hours in an open shallow vessel. During the process, milk is added to readjust its level and compensate the amount of evaporated water. The process consists of harvesting the coagulum formed at the milk surface. Our findings showed that these aggregates result from the denaturation of milk proteins and their interactions with the fat globules. This work has demonstrated that Qishta has almost the same amount of proteins and fat estimated at 12% and therefore the product has a composition similar to that of Ricotta cheese made from whole milk. The characterisation of Qishta using mass spectrometry has allowed to determine and quantify the proteins present in Qishta. These analyses have demonstrated also the presence of “Cross links” between proteins which are involved in the Qishta coagulum formation. Lanthionine and lysinoalanine were identified as neoformed amino acids during the heat treatment. These amino acids are involved in the cross links formed during the heat treatment of milk. These amino acids will establish covalent bonds between the proteins of Qishta coagulum. The confocal laser scanning microscopy analyses of Qishta samples previously treated with Fast Green and Nile red dyes have allowed to highlight the protein-fat interactions considered as the source of coagulum formation.Our findings showed the significant effect of the fat amount present in the initial milk on the process and the yield of Qishta. Increasing the amount of milk fat leads to an increase in the Qishta yield. A milk with 3.2% of fat has given the maximum yield. However, the use of skim milk in the production did not nor lead to any coagulum formation.The effect of ageing during Qishta storage for 20 days at 4 ℃ on the fat oxidation and therefore on the Qishta shelf life has been realized. The results of the primary and secondary indicators of oxidation analyses have showed the fat present in Qishta was not oxidized during the study period.In addition, the emission spectra of tryptophan, riboflavin and the excitation spectra of vitamin A were directly recorded using frontal fluorescence on Qishta stored at 4 ° C for 20 days.The analysis of these spectra by multidimensional statistical tools such as principal component analysis and discriminant factor analysis has allowed to significantly differentiate Qishta samples. Indeed, these analyses have allowed to significantly distinguish between the samples and subsequently predict their shelf life of the product
Tremblay-Marchand, Daniel. „Évaluation de l'impact de différents paramètres opératoires sur la performance de la membrane céramique à gradient de perméabilité pour la séparation des protéines sériques du lait par microfiltration“. Master's thesis, Université Laval, 2016. http://hdl.handle.net/20.500.11794/26669.
La microfiltration (MF) est un procédé membranaire permettant de séparer les micelles de caséines (CN) des protéines sériques (PS) du lait grâce à des pores ayant un diamètre de 0,1 μm. Le rétentat obtenu est enrichi en CN, tandis que le perméat contient des PS sous forme native. La membrane céramique à gradient de perméabilité (GP) a été développée récemment dans le but de réduire l’encrassement à long terme, ce qui permet des flux de perméation élevés et une meilleure séparation des protéines. À ce jour, les conditions opératoires les plus efficientes pour réaliser la MF du lait n’ont pas été déterminées pour ce type de membrane. L’objectif de cette étude était donc de caractériser l’effet de différentes pressions transmembranaires (PTM), différents facteurs de concentration volumique (FCV) et de la diafiltration (DF) sur l’efficience du procédé. Un bilan de matière a été réalisé à la suite du dosage des solides totaux, ainsi que de l’azote total, non caséique et non protéique. La consommation énergétique du système de MF a également été mesurée in situ. Les résultats obtenus démontrent qu’un FCV de 1,5X permet d’obtenir la meilleure séparation des protéines, tout en ayant un flux de perméation plus élevé et une plus faible consommation énergétique. Lorsque le FCV est plus élevé, les pertes totales de CN dans le perméat et la consommation énergétique deviennent plus importantes, ce qui réduit la rentabilité du procédé. Les étapes de DF réduisent l’efficience du procédé en augmentant la durée de filtration et la quantité de perméat généré de façon considérable, sans permettre d’obtenir une quantité satisfaisante de PS supplémentaires dans le perméat. Les résultats obtenus pourront bénéficier aux transformateurs laitiers lors de la prise de décision quant à la pertinence d’effectuer la MF du lait avec la membrane céramique GP.
Microfiltration (MF) is a membrane process used to separate casein (CN) micelles from serum proteins (SP) of milk using 0.1 μm pore diameter membranes. The resulting retentate is enriched in CN, while the permeate contains native SP. The graded permeability (GP) ceramic membrane has been recently developed to reduce long-term fouling, which improves permeation flux and protein separation. To date, the most efficient operating conditions to achieve MF of milk have not been determined for this type of membrane. The objective of this study was to characterize the effect of different transmembrane pressures (TMP), volumetric concentration factors (VCF) and diafiltration (DF) on the process efficiency. Mass balance measurements were carried out following the determination of total solids, total nitrogen, non-casein nitrogen and non-protein nitrogen. The in situ energy consumption of the MF system was also measured. Results obtained showed that a VCF of 1.5X provided the best separation of proteins, while allowing the highest permeation flux and the lowest energy consumption. When the VCF was higher, the total losses of CN in the permeate increased, as well as energy consumption, which reduces the process profitability. DF steps reduced the process efficiency by increasing the filtration time and the amount of permeate generated, without increasing significantly the transmission of additional SP in the permeate. Results will benefit dairy processors in decision making about the potential of MF of skim milk with GP membrane.
Ellouze, Maroua. „Les propriétés émulsifiantes du lait de chamelle et de ses fractions protéiques : étude physico-chimique et biochimique“. Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAC052.
The emulsifying and interfacial properties of camel milk proteins were studied alone, in mixture or in their natural environment (in serum whey, as caseinates or directly in camel milk). The impact of certain physico-chemical conditions was studied, the impact of pH, heat treatment, concentration and homogenization at high pressures. This study was carried out in parallel on cow's milk, under identical conditions. The main results suggest that camel milk is more emulsifying than cow's milk regardless of the processing temperature, however, the stability of emulsions prepared by cow's milk is more important. The homogenizing effect at high pressures allows very stable emulsions compared to cow's milk. The effect of pH and temperature on the caseinic and serum fractions of camel milk is very significant on their behaviour at the oil-water interface and their ability to create emulsions. The coating of oil droplets by sodium caseinates protein of camel milk increases with incrising pH (from 3.0 to 9.0) regardless of the heat treatment (between 25°C and 95°C). This behaviour is the result of denaturation and loss of the micellar structure of sodium caseins at the oil-water interface, thus facilitating their adhesions and adsorption at the interface. However, the whey fraction of camel milk expressed significant emulsifying activity at acid pH as opposed to the sodium caseinate fraction and better emulsifying stability of the created oil droplets. Camel milk whey proteins are found to be less sensitive to the effect of temperature in emulsion creation than bovine milk whey (richer in β-lactoglobulin which are more sensitive to heat treatment). These aspects are due to the small molecular size of serum proteins relative to casein size, which allows them to adsorb quickly and efficiently at the interface of oil droplets and form a stable viscoelastic film all around which suggest that camel milk is more emulsifying active than cow's milk regardless of the processing temperature, however, the stability of emulsions prepared by cow's milk is found to be more important. The homogenizing effect at high pressures allows very stable emulsions compared to cow's milk. The main factor governing the stability of camel milk α-lactalbumin emulsions is its conformational flexibility at the oil-water interface. Structural rearrangements of camel milk α-lactalbumin as well as electrostatic repulsions between oil droplets stabilized by these proteins are the two key factors to explain the effect of pH variation and heat treatment. The surface properties of α-lactalbumin from camel milk are significantly improved after high heat treatments (95°C) which maintain potential emulsifying properties. As for the purified β-casein, its emulsifying activity is more important for camel milk than cow's milk. A micellar structure of caseins is formed from the critical micellar concentration (CMC) which maintains a compact structure close to pH 6.0 and is released at alkaline pH where electrostatic forces are at their highest. This induced a high stability of emulsions at pH 9.0 as well as a better emulsifying activity of β-caseins. The rheological behaviour of emulsions is non-Newtonian where viscosity is higher at low shear rates which depends strongly on the applied pH. Thus, stabilized emulsions at acid pH are the most viscous regardless of the heat treatment temperature applied for most of the studied fractions. This is mainly due to hydrophobic interactions between proteins of the different fractions and to high cohesion forces between larger droplets. However, the viscosity of emulsions stabilized by the protein fractions of cow's milk is often more viscous than camel milk as a result of their higher emulsifying stability. (...)
Granger-Delacroix, Manon. „Microfiltration tangentielle de lait écrémé : Impact des prétraitements du lait et de la conduite de la diafiltration sur les performances de la séparation et la qualité des fractions“. Thesis, Rennes, Agrocampus Ouest, 2020. http://www.theses.fr/2020NSARB338.
Crossflow microfiltration of skimmed milk using 0.1 µm pore size is commonly used in dairy industry to separate casein micelles from serum proteins. However, the design and the conduct of this operation are not optimized. The objective of this thesis is to provide knowledge to improve the performance of 0.1µm-microfiltration skimmed milk. We considered both the characteristics of skimmed milk to be microfiltered and the operating conditions of the operation. This work shows that the duration of cold-storage and the method for microbiological stabilization performed prior microfiltration impact the performance of the operation. The decrease of performance (transmembrane pressure, serum protein recovery)is attributed to the cumulative effect of bacteria/bacterial fragments and modifications of serum proteins (denaturation and aggregation). Performance of microfiltration using polymeric membrane are considerably improved (increase of permeation flux and transmission of serum proteins) using diafiltration mode with reverse osmosis water realized on concentrated retentate and with low transmembrane pressure. The modifications observed can be explained by changes on the properties of the fluid (viscosity) and of the deposit of casein micelles accumulated at the membrane (swelling). These results and the analyses of composition and functionalities of fractions obtained with ceramic and polymeric membranes highlight the real necessity, in the futur, of multi-objective optimization of skimmed milk microfiltration
Kharlamova, Anna. „Texturization of dairy protein systems with whey protein isolate aggregates“. Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1029/document.
The proteins of milk can be divided into whey proteins and caseins. Whey proteins are compact globular proteins that are found in the aqueous phase of milk. They are well-known for their exceptional functional properties. Upon heating, individual whey proteins denature and aggregate, forming aggregates of different morphologies and sizes, such as strands, fractal aggregates, microgels and fibrillar aggregates, depending on the heating conditions. On the other hand, the caseins in milk are organized in complex protein units with a diameter of 100-200 nm called casein micelles stabilized by colloidal calcium phosphate (CCP).The current work is an endeavor to understand how whey protein aggregates might be used in mixtures with other dairy proteins, such as casein micelles, in order to get a particular texture in a dairy product. We first extended the understanding of so-called “cold gelation” of pure WPI aggregates induced by calcium and acidification and then studied how the aggregates work in more complex mixtures of proteins and minerals. Interestingly, addition of small amounts of fractal aggregates to suspensions of casein micelles has been demonstrated to decrease the critical gelation temperature, increase the elastic modulus and decrease the syneresis of the gels.The aggregates are to be used to modify the viscosity of dairy products, as a gelling agent and for protein enrichment. The properties of strands, fractal aggregates and microgels have been studied and compared. WPI aggregates might be considered as “clean label” texturizing ingredients that do not require approval from the European Food Safety Authority (EFSA)
Karam, Marie-Céleste. „Réhydratation des protéines laitières dans un milieu complexe : influence de l'état d'hydratation sur les propriétés texturales des gels acides“. Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0132/document.
The main objectives of this work were to elucidate the rehydration mechanism of the two major milk proteins (micellar casein and whey protein) into a complex and opaque medium such as milk and to assess the influence of hydration state (defined as a function of rehydration length after 5,120,180,240,300, 480, 900 and 1440 minutes of rehydration) on the rheological, textural, physical properties and microstructure of the obtained acid milk gels. Whereas, micellar casein presented a long rehydration process into milk characterized by three stages: a wetting, swelling and dispersion phase, whey protein displayed a quick rehydration process characterized by an overlapping of wetting and dispersion phase. Furthermore, an extended rehydration time of micellar casein powder into the milk base was associated with a postponed onset of gelation and enhanced physical, textural as well as rheological properties of the obtained acid milk gels characterized by increases in gel firmness, strength, and decreases in syneresis susceptibility and grains formation. In contrast, acid milk gels prepared with whey protein powder exhibited comparable overall textural properties regardless the different rehydration times. Nevertheless, denaturation of whey protein powder (by dry heating) was associated with a deterioration of the textural properties of the acid milk gels. Finally, acid gels prepared with whey proteins displayed better overall textural quality than those prepared with micellar casein (except for grains formation)
Daynes, Aurélien. „Dosage de protéines sériques par la méthode d'agglutination magnétique“. Paris 6, 2013. http://www.theses.fr/2013PA066307.
In vitro diagnostic is now a major actor in the domain of healthcare. There is a need for quick assays able to detect low concentrations of biomarker. Magnetic agglutination assay have been developed in that purpose. Antibodies grafted on superparamagnetic particles allow the formation of aggregates in a few minutes, thanks to the application of a magnetic field. Aggregates are generally observed by a turbidimetric method. First part of that work consisted in understanding the phenomena observed by turbidimetry. An agglutination model was developed, allowing predicting the number of aggregates formed, depending on the biomarker concentration. The model was confronted to experimental results. Experiments showed the effect of the way magnetic field was applied on aggregation, especially when important quantities of analyte were used. Concentrations around one picomolar were detected in less than one minute. In order to detect lower concentrations, an individual detection method, relying on the principles of flow cytometry, was then used. Decreasing of the background noise allowed reaching limits of detection of tens to hundreds of femtomolars. Parameters important to the assay, especially the size of the particles and the intensity of the magnetic field, were studied. This work make possible to detect a large variety of proteins, using the magnetic agglutination technique
Bücher zum Thema "Protéines sériques du lait":
Jouan, Pierre. Lactoprotéines et lactopeptides: Propriétés biologiques. Paris: Institut national de la recherche agronomique, 2002.
Arilait. Structure et technofonctions des protéines du lait natives ou modifiées. Tech.& Doc./Lavoisier, 1997.
Buchteile zum Thema "Protéines sériques du lait":
Kratochvil, L., M. Kasýk und K. Zadražil. „Les Possibilit’s D’Influencer la Teneur du Lait en Protéines par L’Alimentation“. In MILK the vital force, 145. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3733-8_121.
Caquet, René. „Protéines sériques (électrophorèse)“. In Guide infirmier des examens de laboratoire, 272–74. Elsevier, 2008. http://dx.doi.org/10.1016/b978-2-294-70220-4.50133-8.
Caquet, René. „Protéines sériques (électrophorèse)“. In 250 examens de laboratoire, 306–7. Elsevier, 2010. http://dx.doi.org/10.1016/b978-2-294-71033-9.50172-2.