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Screening of Milk and Milk Products for Thermonuclease
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.tb10427.x
Subject(s) - raw milk , enterotoxin , cereus , food science , cow milk , contamination , milk products , biology , chemistry , veterinary medicine , bacillus cereus , medicine , bacteria , escherichia coli , biochemistry , ecology , genetics , gene
Out of 208 samples of dairy products, 17.8% contained thermonuclease. Staphylococcal TNase (6‐49 μg/100 mL or g) was detected in 14.4% samples that also contained TNase positive S. aureus and their enterotoxins. Enterotoxin A was recorded most frequently. Incidence of TNase was maximum (30.4%) in raw cow's milk followed by nonfat dry cow's milk (25.9%) and Kulfli (25.0%). The most frequent contaminants in the seven nonstaphylococcal TNase positive samples (6 – 16 μg per 100 mL org) were TNase‐positive enterococci. TNase‐positive B. cereus was recovered from a TNase‐positive sweetened condensed milk sample. Unidentifiable TNase producing molds were detected in three TNase‐positive samples.