Abstract
To make the previously developed biosynthesis of L-2-aminobutyric acid (L-ABA) more suitable for the industrial-scale production. A recyclable biotransformation system was developed based on immobilized enzyme technology. The conversion yield of L-threonine (at 90 g l(-1)) reached 99.9 % and the theoretical yield of L-ABA reached more than 90 % using the optimized biotransformation system by the individual immobilization of threonine deaminase and the co-immobilization of L leucine dehydrogenase and formate dehydrogenase. 90 g L-threonine l(-1) was converted to 73.9 g L-ABA l(-1) >95 % theoretical yield, within 120-145 min in 30 batch transformation experiments. The recyclable biotransformation system is promising to fulfill industrial requirements for L-ABA production.
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