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- W2066060904 abstract "Xylitol is a well-known sugar substitute with low-calorie and anti-cariogenic characteristics. An effort of biological production of xylitol from xylose was made in repeated fed-batch and cell-recycle fermentations of recombinant Saccharomyces cerevisiae BJ3505/δXR harboring the xylose reductase gene from Pichia stipitis. Batch fermentation with 20 g/l xylose and 18 g/l glucose resulted in 9.52 g/l dry cell mass, 20.1 g/l xylitol concentration and approximately 100% conversion yield. Repeated fed-batch operation to remove 10% of culture broth and to supplement an equal volume of 200 g/l xylose was designed to improve xylitol production. In spite of a sudden drop of cell concentration, an increase in dry cell mass led to high accumulation of xylitol at 48.7 g/l. To overcome loss of xylitol-producing biocatalysts in repeated fed-batch fermentation, cell-recycle equipment of hollow fiber membrane was implemented into a xylitol production system. Cell-recycle operation maintained concentration of the recombinant cells high inside a bioreactor. Final dry cell mass of 22.0 g/l, 116 g/l xylitol concentration, 2.34 g/l h overall xylitol productivity were obtained in cell-recycle fermentation supplemented with xylose and yeast extract solution, which were equivalent to 2.3-, 5.8- and 3.8-fold increases compared with the corresponding values of batch-type xylitol production parameters." @default.
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- W2066060904 date "2004-12-01" @default.
- W2066060904 modified "2023-10-16" @default.
- W2066060904 title "Production of xylitol by recombinant Saccharomyces cerevisiae containing xylose reductase gene in repeated fed-batch and cell-recycle fermentations" @default.
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- W2066060904 doi "https://doi.org/10.1016/j.enzmictec.2004.08.006" @default.
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