scholarly journals Kinetics of pepsin-induced hydrolysis and the coagulation of milk proteins

2022 ◽  
Author(s):  
Mengxiao Yang ◽  
Aiqian Ye ◽  
Zhi Yang ◽  
David W. Everett ◽  
Elliot Paul Gilbert ◽  
...  
Keyword(s):  
Milk Proteins ◽  
Kinetics Of

Tribo-rheology and kinetics of soymilk gelation with different types of milk proteins

2020 ◽  
Vol 311 ◽  
pp. 125961 ◽  
Author(s):  
Zhihua Pang ◽  
Ruolin Xu ◽  
Yang Zhu ◽  
Nidhi Bansal ◽  
Xinqi Liu
Keyword(s):  
Milk Proteins ◽  
Different Types ◽  
Kinetics Of

scholarly journals In vivo digestion of infant formula in piglets: protein digestion kinetics and release of bioactive peptides

2012 ◽  
Vol 108 (12) ◽  
pp. 2105-2114 ◽  
Author(s):  
Karima Bouzerzour ◽  
François Morgan ◽  
Isabelle Cuinet ◽  
Cécile Bonhomme ◽  
Julien Jardin ◽  
...  
Keyword(s):  
Infant Formula ◽  
Human Life ◽  
Milk Proteins ◽  
Protein Digestion ◽  
Sds Page ◽  
Newborn Child ◽  
Digestion Kinetics ◽  
Β Lactoglobulin ◽  
Kinetics Of

The first months of life correspond to a key period in human life where dramatic physiological changes (establishment of microbiota, development of the immune system, etc.) occur. In order to better control these changes it is necessary to understand the behaviour of food in the gastrointestinal tract of the newborn. Infant formula is the only food for the newborn when breast-feeding is impossible. The kinetics of digestion of milk proteins and the nature of the peptides liberated in the small intestine throughout infant formula digestion have never been extensively investigated so far and were therefore studied using the piglet as a model of the newborn child. Piglets were fed infant formula by an automatic delivery system during 28 d, and slaughtered 30, 90 and 210 min after the last meal. Contents of stomach, proximal and median jejunum and ileum were collected and characterised. The extent of β-lactoglobulin (β-lg), α-lactalbumin (α-la) and casein proteolysis was monitored by inhibition ELISA, SDS-PAGE, immunoblotting and MS. At 30 min after the last meal, caseins were shown to be extensively hydrolysed in the stomach. Nevertheless, peptides originating mainly from β-caseins (from 509 to 2510 Da) were identified in the jejunum and ileum of the piglets. β-Lg partially resisted gastric digestion but completely disappeared in the stomach after 210 min. α-La had a similar behaviour to that of β-lg. Two large peptides (4276 and 2674 Da) generated from β-lg were present in the ileum after 30 and 210 min and only one (2674 Da) after 90 min.

scholarly journals Ultra High Temperature Treatment, but Not Pasteurization, Affects the Postprandial Kinetics of Milk Proteins in Humans

2008 ◽  
Vol 138 (12) ◽  
pp. 2342-2347 ◽  
Author(s):  
Magali Lacroix ◽  
Cyriaque Bon ◽  
Cécile Bos ◽  
Joëlle Léonil ◽  
Robert Benamouzig ◽  
...  
Keyword(s):  
High Temperature ◽  
Milk Proteins ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Kinetics Of ◽  
Ultra High Temperature

Characterization and kinetics of gastric emptying of peptides derived from milk proteins in the preruminant calf

1992 ◽  
Vol 59 (4) ◽  
pp. 437-447 ◽  
Author(s):  
P. Scanff ◽  
M. Yvon ◽  
S. Thirouin ◽  
J.-P. Pelissffir
Keyword(s):  
Gastric Emptying ◽  
Skim Milk ◽  
Milk Proteins ◽  
Reversed Phase ◽  
Pancreatic Enzymes ◽  
Biologically Active ◽  
Empty Stomach ◽  
Kinetics Of

SummaryThe gastric emptying kinetics of peptides derived from milk protein were studied in vivo in preruminant calves by collecting and characterizing the whole effluent leaving the stomach for 12 h after ingestion of crude skim milk. Peptides were isolated by reversed-phase HPLC and identified. Particular attention was paid to biologically active peptides and to peptides that could be precursors of biologically active sequences. A gastrin inhibitor, the caseinomacropeptide, was emptied from the stomach only during the first 0·5 h of digestion and rapidly hydrolysed. Precursors of immunostimulatory peptides from αs1 - and β-caseins were emptied throughout digestion in the gastric effluent. A precursor of β-casomorphins (peptide 58–93 of β-casein) was emptied from the stomach 3·5 h after the meal when it was taken on an empty stomach. From this precursor, peptides that may be resistant to hydrolysis by intestinal peptidase were obtained after in vitro hydrolysis by pancreatic enzymes. A phosphopeptide (fragment 110–142 of αs1-casein) was also found in digesta after a few hours of digestion. When the meal was not taken on an empty stomach, these peptides were emptied in the first digesta at a low concentration. The potential activity of these peptides is discussed. The results support the hypothesis that active sequences could still be present in the gut after the action of pancreatic enzymes.

The heat treatment and the gelation are strong determinants of the kinetics of milk proteins digestion and of the peripheral availability of amino acids

2013 ◽  
Vol 136 (3-4) ◽  
pp. 1203-1212 ◽  
Author(s):  
Florence Barbé ◽  
Olivia Ménard ◽  
Yann Le Gouar ◽  
Caroline Buffière ◽  
Marie-Hélène Famelart ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Amino Acids ◽  
Milk Proteins ◽  
Kinetics Of

Kinetics of Heat Coagulation of Concentrated Milk Proteins at High Sucrose Contents

1996 ◽  
Vol 61 (6) ◽  
pp. 1207-1210 ◽  
Author(s):  
M.S. PAULETTI ◽  
E.L. CASTELAO ◽  
E. SEGURO
Keyword(s):  
Milk Proteins ◽  
Concentrated Milk ◽  
Kinetics Of ◽  
High Sucrose

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Irradiation behavior of pyrolytic silicon carbide

1983 ◽  
Vol 41 ◽  
pp. 72-73
Author(s):  
R. J. Lauf
Keyword(s):  
Silicon Carbide ◽  
Fission Products ◽  
Thermodynamics And Kinetics ◽  
Neutron Fluences ◽  
Fuel Particles ◽  
Sic Coatings ◽  
Irradiation Behavior ◽  
Kinetics Of ◽  
Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

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