Gastric digestion of milk protein ingredients: Study using an in vitro dynamic model

Journal of Dairy Science
Xin WangHarjinder Singh

Abstract

The coagulation behavior and the kinetics of protein hydrolysis of skim milk powder, milk protein concentrate (MPC), calcium-depleted MPC, sodium caseinate, whey protein isolate (WPI), and heated (90°C, 20 min) WPI under gastric conditions were examined using an advanced dynamic digestion model (i.e., a human gastric simulator). During gastric digestion, these protein ingredients exhibited various pH profiles as a function of the digestion time. Skim milk powder and MPC, which contained casein micelles, formed cohesive, ball-like curds with a dense structure after 10 min of digestion; these curds did not disintegrate over 220 min of digestion. Partly calcium-depleted MPC and sodium caseinate, which lacked an intact casein micellar structure, formed curds at approximately 40 min, and a loose, fragmented curd structure was observed after 220 min of digestion. In contrast, no curds were formed in either WPI or heated WPI after 220 min of digestion. In addition, the hydrolysis rates and the compositions of the digesta released from the human gastric simulator were different for the various protein ingredients, as detected by sodium dodecyl sulfate-PAGE. Skim milk powder and MPC exhibited slower hydrolysis rates than calcium-deplete...Continue Reading

References

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Citations

Aug 23, 2019·Critical Reviews in Food Science and Nutrition·Glenn A A van LieshoutKasper A Hettinga
Sep 29, 2020·The Proceedings of the Nutrition Society·Paul A M SmeetsMorwarid Mayar
Nov 4, 2020·Pediatric Allergy and Immunology : Official Publication of the European Society of Pediatric Allergy and Immunology·Michihiro NaitoHidehiko Izumi
Dec 19, 2020·Comprehensive Reviews in Food Science and Food Safety·Cristian DimaSeid Mahdi Jafari
Dec 15, 2020·Journal of Dairy Science·Debashree RoyHarjinder Singh
Oct 27, 2020·Frontiers in Chemistry·Alejandra Acevedo-FaniHarjinder Singh
May 3, 2021·Clinical Nutrition : Official Journal of the European Society of Parenteral and Enteral Nutrition·Nick GoelenJan Tack

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