[Verification of the proteolytic and lipolytic activities of the microbial flora isolated from raw, refrigerated, type B milk. II. Psychrotrophic microorganisms].
The aim of this work was to evaluate the microbiological quality of raw type B milk, kept under refrigeration at 3 degrees C, for a period of 15 days. The milk was enumerated and isolated a total of 180 microorganisms, of which 80 were psychrotrophics. The ability of these microorganisms to produce lipolysis and/or proteolysis in the milk was evaluated. Concerning the microbiological analysis, the samples analyzed presented high values for total counting. The results from the initial counting were 2.7 x 10(4) UFC/ml for psychrotrophic, with a predominance of Gram negative bacilli, which were highly lipolytic and had proteolytic activities associated.
Silveira
I A
IA
Departamento de Ciencia de los Alimentos, Universidad Federal de Lavras, Minas Gerais, Brasil. ivana@ufla.br
Carvalho
E P
EP
Teixeira
D
D
Barrios
B E
BE
D000818:Animals; D001426:Bacterial Proteins / Q000032:analysis*; D001938:Brazil; D002417:Cattle; D003080:Cold Temperature; D015925:Cryopreservation; D010450:Endopeptidases / Q000032:analysis*; D005260:Female; D005516:Food Microbiology; D005519:Food Preservation; D006090:Gram-Negative Bacteria / Q000201:enzymology / Q000254:growth & development / Q000302:isolation & purification* / Q000502:physiology; D008049:Lipase / Q000032:analysis*; D008066:Lipolysis; D008892:Milk / Q000737:chemistry / Q000382:microbiology*; D012034:Refrigeration
D001426:Bacterial Proteins; D008049:Lipase; D010450:Endopeptidases