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Behaviour of Streptococcus lactis in heat treated (80 °C for 30 min) or sterilized cow's and ewe's milk

Published online by Cambridge University Press:  01 June 2009

Francisco J. Chavarri ,
Jose A. Nuñez  and
Manuel Nuñez
Francisco J. Chavarri
Affiliation:
Departamento de Bioquímica y Microbiología, CRIDA 06, I.N.I.A., Apartado 8111, Madrid, Spain
Jose A. Nuñez
Affiliation:
Departamento de Bioquímica y Microbiología, CRIDA 06, I.N.I.A., Apartado 8111, Madrid, Spain
Manuel Nuñez
Affiliation:
Departamento de Bioquímica y Microbiología, CRIDA 06, I.N.I.A., Apartado 8111, Madrid, Spain
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Summary

Generation times and acid production after 6 and 24 h by 20 strains of Streptococcus lactis of dairy origin were determined in heat treated (80 °C for 30 min) and sterilized cow's and ewe's milk. Ewe's milk enhanced growth of the streptococci, with significantly (P < 0·001) shorter generation times and higher acid production after 6 h incubation than cow's milk, probably due to its higher vitamin content. The stronger buffer capacity of ewe's milk allowed a higher (P < 0·001) acid production after 24 h than cow's milk. A stimulatory effect of sterilization on generation time and acid production after 24 h was observed in cow's milk. However, the heat treated ewe's milk was shown to be a better substrate than sterilized ewe's milk for Str. lactis.

Type
Original Articles
Information
Journal of Dairy Research , Volume 50 , Issue 3 , August 1983 , pp. 357 - 363
Copyright
Copyright © Proprietors of Journal of Dairy Research 1983

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