Type

Journal Article

Authors

Alan L. Kelly
Patrick F Fox
Thom Huppertz

Subjects

Biochemistry

Topics
food handling pressure lactalbumin milk proteins micelles caseins time factors lactoglobulins hydrogen ion concentration protein denaturation animals chemistry female cattle milk whey protein

High pressure treatment of bovine milk: effects on casein micelles and whey proteins. (2004)

Abstract Effects of high pressure (HP) on average casein micelle size and denaturation of alpha-lactalbumin (alpha-la) and beta-lactoglobulin (beta-lg) in raw skim bovine milk were studied over a range of conditions. Micelle size was not influenced by treatment at pressures <200 MPa, but treatment at 250 MPa increased micelle size by approximately 25%, while treatment at > or = 300 MPa irreversibly reduced it to approximately 50% of that in untreated milk. The increase in micelle size after treatment at 250 MPa was greater with increasing treatment time and temperature and milk pH. Treatment times > or = 2 min at 400 MPa resulted in similar levels of micelle disruption, but increasing milk pH to 7.0 partially stabilised micelles against HP-induced disruption. Denaturation of alpha-la did not occur < or = 400 MPa, whereas beta-lg was denatured at pressures >100 MPa. Denaturation of alpha-la and beta-lg increased with increasing pressure, treatment time and temperature and milk pH. The majority of denatured beta-lg was apparently associated with casein micelles. These effects of HP on casein micelles and whey proteins in milk may have significant implications for properties of products made from HP-treated milk.
Collections Ireland -> University College Cork -> PubMed

Full list of authors on original publication

Alan L. Kelly, Patrick F Fox, Thom Huppertz

Experts in our system

1
Alan L. Kelly
Teagasc
Total Publications: 63