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Heat Resistance of Bacillus subtilis Spores at Various Water Activities
Author(s) -
Härnulv B. G.,
Snygg B. G.
Publication year - 1972
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1972.tb03743.x
Subject(s) - bacillus subtilis , water activity , heat resistance , spore , glycerol , aqueous solution , chemistry , food science , microbiology and biotechnology , bacteria , biochemistry , biology , materials science , water content , organic chemistry , composite material , genetics , geotechnical engineering , engineering
S ummary : The heat resistance of spores of Bacillus subtilis was determined in water vapour and in aqueous solutions of NaCl, LiCl, glucose and glycerol at various water activities. In water vapour and in glycerol solutions, maximal resistance appeared at low, but not zero water activity. In NaCl and glucose solutions only small variations in heat resistance occurred with decreasing water activity although a small increase was observed at the highest concentrations tested. With increasing concentrations of LiCl, heat resistance at first decreased but increased at water activities below 0·5. The possible interaction of compounds controlling water activity and water activity per se on heat resistance is discussed.