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Proteinase and phospholipase activities and development at different temperatures of yeasts isolated from bovine milk

Published online by Cambridge University Press:  27 July 2011

Priscilla A Melville ,
Nilson R Benites ,
Monica Ruz-Peres  and
Eugenio Yokoya
Priscilla A Melville*
Affiliation:
Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine and Zootechny, University of São Paulo, Brazil
Nilson R Benites
Affiliation:
Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine and Zootechny, University of São Paulo, Brazil
Monica Ruz-Peres
Affiliation:
Max Planck Veterinary Medicine Facility, Indaiatuba, São Paulo, Brazil
Eugenio Yokoya
Affiliation:
Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine and Zootechny, University of São Paulo, Brazil
*
*For correspondence; e-mail:[email protected]
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Abstract

The presence of yeasts in milk may cause physical and chemical changes limiting the durability and compromising the quality of the product. Moreover, milk and dairy products contaminated by yeasts may be a potential means of transmission of these microorganisms to man and animals causing several kinds of infections. This study aimed to determine whether different species of yeasts isolated from bovine raw milk had the ability to develop at 37°C and/or under refrigeration temperature. Proteinase and phospholipase activities resulting from these yeasts were also monitored at different temperatures. Five genera of yeasts (Aureobasidium sp., Candida spp., Geotrichum spp., Trichosporon spp. and Rhodotorula spp.) isolated from bovine raw milk samples were evaluated. All strains showed one or a combination of characteristics: growth at 37°C (99·09% of the strains), psychrotrophic behaviour (50·9%), proteinase production (16·81% of the strains at 37°C and 4·09% under refrigeration) and phospholipase production (36·36% of the isolates at 37°C and 10·9% under refrigeration), and all these factors may compromise the quality of the product. Proteinase production was similar for strains incubated at 37°C (16·81% of the isolates) and room temperature (17·27%) but there was less amount of phospholipase-producing strains at room temperature (15·45% of the isolates were positive) when compared with incubation at 37°C (36·36%). Enzymes production at 37°C by yeasts isolated from milk confirmed their pathogenic potential. The refrigeration temperature was found to be most efficient to inhibit enzymes production and consequently ensure better quality of milk. The viability of yeasts and the activity of their enzymes at different temperatures are worrying because this can compromise the quality of dairy products at all stages of production and/or storage, and represent a risk to the consumer.

Keywords

Yeastbovine milkproteinasephospholipasepsychrotrophsvirulence factor
Type
Research Article
Information
Journal of Dairy Research , Volume 78 , Issue 4 , November 2011 , pp. 385 - 390
Copyright
Copyright © Proprietors of Journal of Dairy Research 2011

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