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Incidence of Enterococcal Thermonuclease in Milk and Milk Products
Author(s) -
BATISH V. K.,
CHANDER HARISH,
RANGANATHAN B.
Publication year - 1984
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1984.tb12856.x
Subject(s) - deoxyribonuclease , staphylococcus aureus , biology , incidence (geometry) , microbiology and biotechnology , enterococcus , enterotoxin , food science , bacteria , escherichia coli , genetics , dna , antibiotics , mathematics , geometry , gene
Out of 728 enterococcal isolates recovered from 208 samples of milk and milk products, 216 isolates (29.7%) produced deoxyribonuclease (DNase), but among them only 31 (4.3%) were capable of exhibiting thermonuclease (TNase) activity. The incidence of DNase positive enterococci was maximum (63.4%) in Kulfi mix, but the number of thermonuclease positive enterococci was maximum (9.6%) in nonfat dry cow's milk. DNase positive enterococci were encountered in 78 (37.5%) samples, whereas only 22 (10.6%) of the samples showed the presence of thermonuclease producing enterococci. Although 30 samples (14.4%) contained staphylococcal TNase, thermonuclease of nonstaphyloccal origin was actually detected in 7 such samples. The latter, however, did not contain either Staphylococcus aureus or their enterotoxins.