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Contribution of casein micelle size and proteolysis on protein distribution and sediment formation in UHT milk during storage

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Formation of sediment in ultra-high temperature (UHT) treated milk has recently been associated with native casein (CN) micelle size and protein composition. This study investigates changes in the protein composition in sub-fractions of UHT treated milk, including sediment, during storage at 40 °C for up to 6 months of milk prepared from milk with either small or large CN micelles. The proteins in sediment were mainly αS1-CN and β-CN and low levels of β-lactoglobulin. The increase of CNs in the soluble phase caused by processing was higher for milk with large native CN micelles. The level of C-terminal derived κ-CN peptides was positively correlated to the level of sediment in the milk. This indicates higher level of removal of κ-CN from the CN micelle with large native size may destabilise the CN micelles causing formation of sediment during storage.

Original languageEnglish
Article number104980
JournalInternational Dairy Journal
Number of pages13
Publication statusPublished - Jun 2021

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