1982
DOI: 10.1017/s0022029900022731
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Qualitative and quantitative determination of proteolysis in mastitic milks

Abstract: SUMMARYProteolytic activity in mastitic skim-milk was often 5–10 fold higher than in normal milk, its level being related to somatic cell count but not precisely correlated with it. In milks with the highest levels of activity plasmin accounted for about one third of the total proteinase. A further third was sedimented with the micellar fraction together with the plasmin, but unlike plasmin, was not inhibited by addition of soyabean trypsin inhibitor (SBTI). The final third remained in the serum phase.Polyacry… Show more

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Cited by 69 publications
(48 citation statements)
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“…The reduction in milk proteins might be due to a decreased absorption of amino acids in the gut and to a redirection of the use of amino acids toward immunoglobulins. Because of the increased proteolytic activity of the milk during mastitis (1,7,20,37), which is mainly due to increased plasmin activity, caseins are hydrolyzed. These changes in milk composition indicate serious damage to the blood-milk barrier with disruption of the tight junctions between mammary epithelial cells and paracellular leakage (43).…”
Section: Discussionmentioning
confidence: 99%
“…The reduction in milk proteins might be due to a decreased absorption of amino acids in the gut and to a redirection of the use of amino acids toward immunoglobulins. Because of the increased proteolytic activity of the milk during mastitis (1,7,20,37), which is mainly due to increased plasmin activity, caseins are hydrolyzed. These changes in milk composition indicate serious damage to the blood-milk barrier with disruption of the tight junctions between mammary epithelial cells and paracellular leakage (43).…”
Section: Discussionmentioning
confidence: 99%
“…Nevertheless, if the plasmin activity could reliably explain in part the variation of proteolysis, a significant measure of the proteolysis is attributed to the variation of SCC. This hypothesis was proposed more than 2 decades ago by De Rham and Andrews (1982) and confirmed recently by Moussaoui et al (2004).…”
Section: Evolution Of Ppc and Ph 46 Insoluble Peptidementioning
confidence: 70%
“…No leite com baixa CCS, pode-se observar uma taxa normal de ativação do plasminogênio para plasmina. No entanto, uma taxa acentuadamente maior ocorre em leites com alta CCS (DE RHAM & ANDREWS, 1982). KENNEDY & KELLY (1997) demonstraram que a atividade da plasmina no leite cru com 800.000 células mL -1 foi aproximadamente duas vezes maior que no leite com CCS menor que 150.000 células mL -1 .…”
Section: Introductionunclassified