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Effect of Vacuum Concentration on Survival and Behavior of S. aureus 234
Author(s) -
BATISH V.K.,
NATARAJ B.,
GROVER SUNITA
Publication year - 1990
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.1365-2621.1990.tb06073.x
Subject(s) - staphylococcus aureus , anaerobic exercise , agar , population , coagulase , hemolysis , microbiology and biotechnology , mannitol , chemistry , food science , sterilization (economics) , biology , biochemistry , staphylococcus , bacteria , medicine , immunology , physiology , genetics , environmental health , economics , monetary economics , foreign exchange market , foreign exchange
Staphylococcus aureus 234 population was reduced from 18 × 10 5 cfu/mL to 31 × 10 4 cfu/mL after 1:3 vacuum concentration of cow's milk. However, the corresponding figures during concentration of buffalo milk were 20 × 10 5 cfu/mL and 109 × 10 4 cfu/mL. The ability to produce enterotoxin B was completely lost in all the five variants (survivors) examined. However, coagulase and Thermonuclease (TNase) activities were only slightly decreased as compared to those of the parent strain. The egg yolk clearing by some variants on Baird Parker agar was delayed by 24 hrs and the colonies were of diffused type. The other activities like phosphatase, gelatin liquefaction, aerobic and anaerobic glucose and mannitol utilization, and hemolysis were not affected in the survivors.