Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-23T07:10:38.671Z Has data issue: false hasContentIssue false

324. The heat resistance of the bacteriophages of cheese starter with observations on the estimation of phage concentration

Published online by Cambridge University Press:  01 June 2009

Agnes A. Nichols
Affiliation:
National Institute for Research in Dairying, University of Reading
J. Z. Wolf
Affiliation:
National Institute for Research in Dairying, University of Reading

Extract

The heat resistance, in milk, of bacteriophages attacking strains of lactic streptococci isolated from cheese starters has been determined. Active phages did not usually survive a temperature of 75°C. for 7½ min. but many phages were not destroyed by heating for 50–60 min. at 65–67°C. and most survived at 70°C. for 10–15 min. The practical implications of these findings in the ‘sterilization’ of milk for starter making have been discussed. Growth in yeast dextrose broth was found to be superior to methylene blue reduction for the demonstration of residual phages after heating.

Type
Original Articles
Copyright
Copyright © Proprietors of Journal of Dairy Research 1945

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

(1)Mazé, P. (1938). C.R. Soc. Biol, Paris, 128, 859.Google Scholar
(2)Whitehead, H. R. & Hunter, G. J. E. (1939). J. Dairy Res. 10, 403.CrossRefGoogle Scholar
(3)Nelson, F. E., Harriman, L. A. & Hammer, B. W. (1939). Res. Bull. la agric. Exp. Sta. no. 256.Google Scholar
(4)Evans, A. C. (1934). Publ. Hlth Rep., Wash. 49, 1386.CrossRefGoogle Scholar
(5)Evans, A. C. & Sockrider, E. M. (1942). J. Bact. 44, 211.CrossRefGoogle Scholar
(6)Yakovlev, D. A. (1939). Mihrobiologiya (U.S.S.R.), 8, 932.Google Scholar
(7)Nichols, A. A. & Wolf, J. Z. (1944). J. Dairy Res. 13, 302.CrossRefGoogle Scholar
(8)Nichols, A. A. & Wolf, J. Z. (1945). J. Dairy Res. 14, 81.CrossRefGoogle Scholar