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The temperature profiles of growth, thermal death and ethanol tolerance of the xylose‐fermenting yeast Candida shehatae
Author(s) -
Lucas Candida,
Van Uden N.
Publication year - 1985
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.3620250822
Subject(s) - yeast , xylose , fermentation , ethanol , arrhenius plot , arrhenius equation , chemistry , growth rate , thermodynamics , activation energy , ethanol fuel , botany , food science , biochemistry , biology , organic chemistry , physics , mathematics , geometry
The temperature profile of growth and thermal death of the xylose‐fermenting yeast Candida shehatae was dissociative. The Arrhenius plot of growth lacked a descending supraoptimal branch and the specific growth rate at the maximum temperature for growth (around 31°C) was not significantly different from its values at the other temperatures studied (down to 20°C). Ethanol enhanced thermal death by increasing its entropy of activation (entropy coefficient 16.1 entropy units mol −1 ) −1 ). The temperature profile of ethanol tolerance with respect to growth displayed a temperature plateau (10–17.5°C) of maximum ethanol tolerance (limit 6% v/v of ethanol) while the toxic effects of ethanol increased on either side of the plateau depressing the maximum temperature for growth from 31 to 17.5°C and increasing the minimum temperature for growth from 2.5 to 10°C.