The influence of hexoses addition on the fermentation of d-xylose in Debaryomyces hansenii under continuous cultivation.

Abstract:

:The effect of hexoses (glucose and galactose) addition to the feed xylose mineral medium of Debaryomyces hansenii chemostat cultures grown at a constant dilution rate of 0.055 h(-1) was studied. Xylitol was the major product detected amongst all tested conditions. The maximal values for xylitol yield and volumetric productivity (0.56 gg(-1) xylose and 0.21 gl(-1)h(-1), respectively) were obtained for a glucose/xylose feeding ratio of 10%, showing that the addition of small amounts of glucose, but not galactose, enhanced the xylitol production. A xylitol yield increase of 30%, compared with the sole xylose-containing feed medium, was observed. It was found that the oxygen requirement for D. hansenii growth is lower under glucose compared with xylose. Ethanol and glycerol were only produced for glucose/xylose feeding ratio above 30%. The byproducts accumulation was correlated with glucose metabolism, because a direct relationship between the increase of ethanol (and glycerol) concentration and the increase of glucose in the feed medium was found.

journal_name

Enzyme Microb Technol

authors

Tavares JM,Duarte LC,Amaral-Collaço MT,Gírio FM

doi

10.1016/s0141-0229(00)00166-6

keywords:

subject

Has Abstract

pub_date

2000-06-01 00:00:00

pages

743-747

issue

9-10

eissn

0141-0229

issn

1879-0909

pii

S0141022900001666

journal_volume

26

pub_type

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