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Adherence of psychrotrophic bacteria to dairy equipment surfaces

Published online by Cambridge University Press:  01 June 2009

Beatriz Suárez ,
Carlos M. Ferreirós  and
Maria-Teresa Criado
Beatriz Suárez
Affiliation:
Centro de Investigacions Agrarias de Mabegondo, Apartado 10, 1580 La Coruña, España
Carlos M. Ferreirós
Affiliation:
Departamento de Microbiologia, Facultad de Farmacia, Universidad de Santiago, 15706 Santiago de Compostela, España
Maria-Teresa Criado
Affiliation:
Departamento de Microbiologia, Facultad de Farmacia, Universidad de Santiago, 15706 Santiago de Compostela, España
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Summary

Psychrotrophic bacteria isolated from raw milk were tested for their ability to adhere to steel, two types of rubber, and glass, materials employed in the construction of milking equipment. The adherence assays were carried out by exposure of the materials to radioactively labelled bacteria in both a buffering solution (Ringer's) and milk. The degree of adherence of Gram-positive bacteria was lower (P < 0·001) than that of Gram-negative bacteria. Glass was the material least prone to bacterial adherence (P < 0·001); there were no significant differences between the other three materials. Milk was found to inhibit adhesion significantly (P < 0·05), this inhibition being more evident with the most adherent bacteria. There was no statistically significant correlation between bacterial surface hydrophobicity and adherence. Our results suggest that intrinsic bacterial adherence cannot be considered a relevant factor in the contamination of milking equipment.

Type
Original Articles
Information
Journal of Dairy Research , Volume 59 , Issue 3 , August 1992 , pp. 381 - 388
Copyright
Copyright © Proprietors of Journal of Dairy Research 1992

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