Determinación cuantitativa de proteasas de bacterias psicrotróficas aisladas de leche cruda

Ana Karina Carrascal Camacho; Bernardo Clavijo; Katherine Márquez; Ing. Balkys E. Quevedo MSC; Edna Patricia Tascón Peñaranda

doi:10.22490/24629448.368

Vol. 5 No. 7 (2007)

Published 2007-06-15

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Quantitative Determination of Proteases of Isolated Psychotropic Bacteria in Raw Milk

DOI: https://doi.org/10.22490/24629448.368

Ana Karina Carrascal Camacho Laboratorio de Microbiología de Alimentos. Departamento de Microbiología, Facultad de Ciencias. Pontificia Universidad Javeriana

Bernardo Clavijo Laboratorio de Microbiología de Alimentos. Departamento de Microbiología, Facultad de Ciencias. Pontificia Universidad Javeriana

Katherine Márquez Laboratorio de Microbiología de Alimentos. Departamento de Microbiología, Facultad de Ciencias. Pontificia Universidad Javeriana

Ing. Balkys E. Quevedo MSC Laboratorio de Microbiología de Alimentos. Departamento de Microbiología, Facultad de Ciencias. Pontificia Universidad Javeriana

Edna Patricia Tascón Peñaranda Laboratorio de Microbiología de Alimentos. Departamento de Microbiología, Facultad de Ciencias. Pontificia Universidad Javeriana

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Abstract
References

The general use of refrigeration on raw milk has contributed to maintenain its quality, but has induced the selection of psychotropic bacteria which during its growth produces heat-resistant enzymes responsible, in part, for the deterioration of long-life products. This study was designed for the quantification of proteolytic activity in six microorganisms that correspond to Pseudomonas fluorescens R12 y R13, Pseudomonas putida R20, Micrococcus luteus R16, Bacillus circulans R5 y Serratia liquefasciens R4, isolated and characterized of raw milk.

The strains were cultured in milk broth 11% for kinetics profile and the experimental data was adjusted to the Baranyi Model. This Model guaranteed a suitable description of _máx, td y Log UFC. Pseudomonas putida R20 showed the best growing profile with _máx = 0,1066h-1 and td = 6,5023h. Proteolytic activity was determined according to Hübner and it was established that Bacillus circulans R5, in a temperature of 5ºC, produced at the 4th fermentation hour the largest amount of proteases (3,618UP/mL) with the rest of the used strains. Finally, it was established that the temperature with the largest proteolytic activity was 5ºC and, as it increases, it causes a considerable decrease in protease production.

keywords: Baranyi model, proteases, proteolytic activity, psychotropic microorganism.

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Carrascal Camacho, A. K., Clavijo, B., Márquez, K., Quevedo MSC, I. B. E., & Tascón Peñaranda, E. P. (2007). Quantitative Determination of Proteases of Isolated Psychotropic Bacteria in Raw Milk. NOVA Biomedical Sciences Journal, 5(7), 14-24. https://doi.org/10.22490/24629448.368

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Quantitative Determination of Proteases of Isolated Psychotropic Bacteria in Raw Milk

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