Abstract
An effective method for production of L-tryptophan from hair acid hydrolysis wastewater (HHW) containing L-serine was developed by recombinant tryptophan synthase. This study provides us with an alternative HHW utilization strategy. Tryptophan synthase could efficiently convert L-serine contained in HHW to L-tryptophan at pH 8.0, 40°C and Tween-80 of 0.04%. The enzyme also showed high tolerance to ammonium chloride, a component in HHW. In a scale up study, L-serine conversion rate reach 95.1% with a final L-tryptophan concentration of 33.2 g l(-1).
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