Xylitol and riboflavin accumulation in xylose-grown cultures of Pichia guilliermondii |
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Authors: | T D Leathers S C Gupta |
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Institution: | (1) Biopolymer Research Unit, National Center for Agricultural Utilization Research (NCAUR), Agricultural Research Service, U. S. Department of Agriculture, Peoria, IL 61604, USA, US |
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Abstract: | Seven strains of Pichia guilliermondii (Candida guilliermondii, asexual state) from diverse isolation sources were examined for the production of xylitol and riboflavin in xylose-grown
cultures. Under the conditions tested, all strains produced xylitol from xylose; conversion efficiencies varied, on a strain-specific
basis, from 7% to 36% of the initial substrate. Four of seven strains metabolized xylitol immediately as xylose levels became
depleted. The remaining three strains metabolized xylitol slowly and incompletely. Surprisingly, utilization of xylitol showed
an apparent relationship with riboflavin production. Strains that readily metabolized xylitol produced at least threefold
greater levels of riboflavin than did strains that used xylitol slowly. Moreover, riboflavin accumulation took place during
xylitol consumption. P. guilliermondii strains that produced the highest levels of riboflavin on xylose produced significantly less riboflavin when grown on glucose
or directly on xylitol.
Received: 24 April 1996 / Received revision: 29 July 1996 / Accepted: 24 August 1996 |
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