Effect of xylitol and trehalose on dry resistance of yeasts |
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| Authors: | I Krallish H Jeppsson A Rapoport B Hahn-Hägerdal |
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| Institution: | (1) Institute of Microbiology and Biotechnology, Latvian University, LV-1586, Riga, Latvia, LV;(2) Department of Applied Microbiology, Centre for Chemistry and Chemical Engineering, Lund Institute of Technology/Lund University, P. O. Box 124, S-221 00 Lund, Sweden Fax: + 46 46 2224203 e-mail: Barbel.Hahn-Hagerdal@tmb.lth.se, SE |
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| Abstract: | The effects of dehydration/rehydration on two strains of Saccharomyces cerevisiae: S600, a metabolically engineered xylose-utilising strain, and H158, the non-xylose-utilising host strain; and on the naturally
xylose-utilising yeast Pachysolen tannophilus CBS 4044, were compared after glucose and xylose utilisation respectively. The yeast strains differed in their ability to
excrete and accumulate intracellular xylitol. A high intracellular xylitol content before and after dehydration coincided
with a higher viability after a dehydration/rehydration cycle. The intracellular trehalose content increased during dehydration
in all three yeast strains, but this did not correspond to enhanced cell viability after dehydration/rehydration. The results
are discussed in relation to the ability of xylitol and trehalose to structure water.
Received: 9 July 1996 / Received revision: 29 October 1996 / Accepted: 2 November 1996 |
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