The ability of 15 psychrotrophic strains to release fatty acids C-8:0 to C-20:1 from cream by GC/ MS and the substrate specificity of their lipases against selected triacylglycerols (TAG) were studied. The free fatty acids (FFAs) detected in the highest quantities were, in general, those of long (C-16; C-18) and intermediate (C-12; C-14) even-numbered carbon chain and unsaturated C-18:1 and C-18:2. The ability of lipolytic strains to release fatty acids from milk fat varies according to the bacterial genus, among species and even with the strain of a given species. TAG breakdown by psychrotrophs may occur in a greater or lesser extent, but type and amount of released FFAs are not easily predictable. Pseudomonas rhodesiae showed the highest hydrolytic resistance towards all tested fatty acid triglycerides.

Fatty acids released from cream by psychrotrophs isolated from bovine raw milk.

Decimo M;Brasca M;
2016

Abstract

The ability of 15 psychrotrophic strains to release fatty acids C-8:0 to C-20:1 from cream by GC/ MS and the substrate specificity of their lipases against selected triacylglycerols (TAG) were studied. The free fatty acids (FFAs) detected in the highest quantities were, in general, those of long (C-16; C-18) and intermediate (C-12; C-14) even-numbered carbon chain and unsaturated C-18:1 and C-18:2. The ability of lipolytic strains to release fatty acids from milk fat varies according to the bacterial genus, among species and even with the strain of a given species. TAG breakdown by psychrotrophs may occur in a greater or lesser extent, but type and amount of released FFAs are not easily predictable. Pseudomonas rhodesiae showed the highest hydrolytic resistance towards all tested fatty acid triglycerides.
2016
Istituto di Scienze delle Produzioni Alimentari - ISPA
psychrotrophs
milk
Free fatty acid
lipase
milk spoilage
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/323770
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