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A thermoduric strain of Streptomyces albus, isolated from Cheddar cheese

Published online by Cambridge University Press:  01 June 2009

T. F. Fryer  and
M. Elisabeth Sharpe
T. F. Fryer
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
M. Elisabeth Sharpe
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
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Summary

A strain of Streptomyces albus, presumed to have originated in raw milk, was found in large numbers in a pair of experimental cheeses. The numbers of streptomyces in both cheeses remained constant over the 4-month period of sampling and a comparison of the numbers obtained from cheese dissolved in citrate with and without mechanical aid revealed no differences, suggesting that the streptomyces was present in the conidial state. The heat resistance of mycelium and of conidia was determined at 62·7 °C (145 °F) and 71·7 °C (161 °F). The mycelial cells showed no resistance to either temperature, there being 100% kill after 15 min at 62·7 °C and 17 sec at 71·7 °C. The conidia, however, were very much less affected after 2 h at 62·7 °C, and 3% remained viable even after 30 min at 71·7 °C. Although the strain was found to be proteolytic, lipolytic and saccharolytic, it appeared to be inactive in the cheese, being present in the conidial state.

Type
Original Articles
Information
Journal of Dairy Research , Volume 32 , Issue 1 , February 1965 , pp. 27 - 34
Copyright
Copyright © Proprietors of Journal of Dairy Research 1965

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