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Thermostability of Proteases and Lipases from a Number of Species of Psychrotrophic Bacteria of Dairy Origin
Author(s) -
GRIFFITHS M. W.,
PHILLIPS J. D.,
MUIR D. D.
Publication year - 1981
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.1365-2672.1981.tb00894.x
Subject(s) - proteases , thermostability , psychrotrophic bacteria , bacteria , food science , mesophile , enzyme , lipase , heat resistance , chemistry , microbiology and biotechnology , biology , biochemistry , shelf life , materials science , genetics , composite material
Proteases and lipases from a number of different species of psychrotrophic bacteria isolated from dairy products are resistant to heat treatments of 77°C for a holding time of 17 s and 140°C for a holding time of 5s. A further treatment combining the 77°C for 17 s heating process with a heat treatment involving a temperature of 55°C for 1 h was also examined. The proteases and, to a lesser extent, the lipases were also resistant to the treatments in combination. The resistance of proteases and lipases to inactivation by a treatment of 55°C for 1 h varied between and within species. Therefore, this treatment may not have a widespread practical application.