Plasmin activity and proteose-peptone content of individual milks
- 31 July 1985
- journal article
- research article
- Published by Cambridge University Press (CUP) in Journal of Dairy Research
- Vol. 52 (3), 369-378
- https://doi.org/10.1017/s0022029900024274
Abstract
SUMMARY: The variation in plasmin activity and proteose-peptone (PP) content in milks from 81 cows of four breeds was statistically analysed. Plasmin activity increased with parity and stage of lactation and differed between breeds, but the breed effect was removed when adjustment was made for differences in milk casein content. The negative correlation found between plasmin activity and casein content seemed to be expressed only under assay conditions and was thus probably an artefact. The linear regressions of proteose-peptones in fresh (PP) and cold-stored milks (ΔPP) on plasmin activity were highly significant (P< 0·001). However, the variation in plasmin activity explained only 38 and 33%, respectively, of the variation in PP and ΔPP. At apparent zero plasmin activity, PP and ΔPP were significantly different from zero (P< 0·001) and the intercepts represented 77 and 46%, respectively, of the averages. PP and ΔPP were significantly higher in milks containing the BB genotype of ²-lactoglobulin than in milks with the AA genotype.This publication has 27 references indexed in Scilit:
- Human endothelial cells contain one type of plasminogen activatorFEBS Letters, 1984
- Proteolysis of caseins and the proteose-peptone fraction of bovine milkJournal of Dairy Research, 1983
- Qualitative and quantitative determination of proteolysis in mastitic milksJournal of Dairy Research, 1982
- Casein compositional studies: II. The effect of secretory disturbance on casein composition in freshly drawn and aged bovine milksJournal of Dairy Research, 1981
- Casein compositional studies: 1. The composition of casein from Friesian herd milksJournal of Dairy Research, 1980
- Mammary plasminogen activator: correlation with involution, hormonal modulation and comparison between normal and neoplastic tissueCell, 1979
- The formation and structure of some proteose-peptone componentsJournal of Dairy Research, 1979
- Effect of proteose-peptone on the heat gelation of whey protein isolatesJournal of Dairy Research, 1979
- Formation of γ1-A2, γ2-A2 AND γ3-A caseins by In vitro proteolysis of β-CASEIN A2 with bovine plasminInternational Journal of Biochemistry, 1977
- The composition of whole casein from the milk of Ayrshire cowsJournal of Dairy Research, 1977