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PASTEURISED MILK. I. PRELIMINARY RESULTS OF A SURVEY OF PLANTS IN THE MIDLANDS
Author(s) -
Provan A. L.,
Rowlands A.
Publication year - 1939
Publication title -
proceedings of the society of agricultural bacteriologists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0370-1786
DOI - 10.1111/j.1365-2672.1939.tb03908.x
Subject(s) - pasteurization , raw milk , contamination , biology , food science , veterinary medicine , zoology , medicine , ecology
Summary The results of the bacteriological examination of 500 samples of pasteurised milk taken by surprise at monthly intervals from 41 plants in the Midlands are reviewed. Of the samples examined 7·2% had a colony count at 37° C. in excess of 100,000 per ml. and did not comply with the official standard, 3% had a colony count at 63° C. in excess of 100,000 per ml., 26·4% contained coliform organisms in 1 ml. or less, and the phosphatase test gave evidence that 8·8% were inefficiently pasteurised. The investigation showed that the phosphatase test was reliable in detecting faults of pasteurisation and the coliform test provided evidence of plant contamination. The colony count at 37° C. was not as reliable as these two tests for detecting faults in plant management, the result being influenced by the number of heat‐resistant organisms in the raw milk.