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Psychrotrophic flora of raw milk: resistance to several common disinfectants

Published online by Cambridge University Press:  01 June 2009

Beatriz Suárez  and
Carlos M. Ferreirós
Beatriz Suárez
Affiliation:
Centro de Investigaciones Agrarias de Mabegondo, Apartado 10, 15080 La Coruña, Spain
Carlos M. Ferreirós
Affiliation:
Departamento de Microbiología, Facultad de Farmacia, Universidad de Santiago, Spain
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Summary

The psychrotrophic bacterial flora of milk was examined after aseptic hand milking. A total of 409 strains were tentatively characterized and classified into 17 groups by a reduced set of tests and cluster analysis. Lipolytic organisms (53·7%) exceeded proteolytic organisms (29·6%), and a reported predominance of oxidase-positive organisms (54·5%) was not found. Gram-negatives were mainly Entero-bacteriaceae, Flavobacterium, Acinetobacter and Pseudomonas. In the Gram-positive groups Micrococcaceae were the most abundant (44·4%) followed by coryneforms (16·3%). Only two of seven commonly used disinfectants acted differently with Gram-positive and Gram-negative organisms (P < 0·01), although in general Gram-positives were more resistant than Gram-negatives.

Type
Original articles
Information
Journal of Dairy Research , Volume 58 , Issue 1 , February 1991 , pp. 127 - 136
Copyright
Copyright © Proprietors of Journal of Dairy Research 1991

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