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Production of xylitol from Candida tropicalis by using an oxidation-reduction potential-stat controlled fermentation
Dey-Chyi Sheu1, Kow-Jen Duan, Shiuan-Ru Jou
1Department of Bioengineering, Tatung University, Taipei 104, Taiwan. dcsheu@ttu.edu.tw
Abstract:
An on-line device, ORP (oxidation-reduction potential)-stat, was used to control glucose-feeding for enhancing xylitol conversion from D-xylose during an oxygen-limited fermentation by Candida tropicalis. The fermentation was carried out in a 5 l jar fermenter. After glucose in the medium was depleted, a switching to a limited aeration and feeding glucose controlled by ORP-stat was performed. The maximum xylitol yield was obtained under a condition at an ORP of -180 mV and at an aeration rate of 0.2 l min(-1).
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