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  • Title: Proteolysis during storage of UHT milk: differences between whole and skim milk.
    Author: López-Fandiño R, Olano A, Corzo N, Ramos M.
    Journal: J Dairy Res; 1993 Aug; 60(3):339-47. PubMed ID: 8376632.
    Abstract:
    Proteolysis during storage of UHT skim and whole milks processed by either direct or indirect systems has been studied. All the proteolysis indices determined (measurement of free amino groups, PAGE of caseins and PAGE and reversed-phase HPLC of the fraction soluble at pH 4.6) revealed greater proteolytic degradation during storage of skim milks compared with that of whole milks subjected to the same UHT treatments. Increased activities of both native milk proteinase and proteinases of bacterial origin were observed in skim UHT milks. The different behaviour of UHT skim and whole milks on storage would have to be taken into account in establishing the process conditions.
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