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Pepsin-induced coagulation of casein micelles: Effect of whey proteins and heat treatment

journal contribution
posted on 2023-06-06, 20:05 authored by Mengxiao Yang, Aiqian Ye, Zhi YangZhi Yang, David EverettDavid Everett, Elliot Paul Gilbert, Harjinder Singh

 The effect of whey proteins and heat treatment (90 °C, 5 min) on pepsin-induced hydrolysis of κ-casein, and subsequent coagulation of casein micelles, was investigated at pH 6.3 and 6.0 using reverse-phase HPLC, oscillatory rheology, and confocal laser scanning microscopy. Whey proteins did not affect the hydrolysis of κ-casein but retarded the coagulation process. Heat treatment did not affect the hydrolysis kinetics in whey protein (WP)-free samples, but slightly impaired the hydrolysis rate in WP-containing samples. The coagulation process of WP-free samples was little affected by heat-treatment. However, compared with unheated WP-contained sample at the same pH, the coagulation process of the heated sample was retarded at pH 6.3 but enhanced at pH 6.0. The curd in heated samples with smaller pores had higher water holding capacity. This knowledge provides further understanding on the role of whey proteins and heat treatment on the coagulation mechanisms of milk under gastric conditions. 

Funding

MBIE Endeavour programme “Milks Mean More: Unlocking the potential of New Zealand's ruminant milks”

History

Rights statement

© 2022 Elsevier Ltd. All rights reserved

Publication date

2022-09-13

Project number

  • Non revenue

Language

  • English

Does this contain Māori information or data?

  • No

Publisher

Elsevier

Journal title

Food Chemistry

ISSN

0308-8146

Volume/issue number

402

Page numbers

134214

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