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• W3124763733 abstract "Abstract Background Xylitol is a five-carbon sugar alcohol that has numerous beneficial health properties. It has almost the same sweetness as sucrose but has lower energy value compared to the sucrose. Metabolism of xylitol is insulin independent and thus it is an ideal sweetener for diabetics. It is widely used in food products, oral and personal care, and animal nutrition as well. Here we present a two-stage strategy to produce bio-xylitol from d -xylose using a recombinant Pichia pastoris expressing a heterologous xylose reductase gene. The recombinant P. pastoris cells were first generated by a low-cost, standard procedure. The cells were then used as a catalyst to make the bio-xylitol from d -xylose. Results Pichia pastoris expressing XYL1 from P. stipitis and gdh from B. subtilis demonstrated that the biotransformation was very efficient with as high as 80% (w/w) conversion within two hours. The whole cells could be re-used for multiple rounds of catalysis without loss of activity. Also, the cells could directly transform d -xylose in a non-detoxified hemicelluloses hydrolysate to xylitol at 70% (w/w) yield. Conclusions We demonstrated here that the recombinant P. pastoris expressing xylose reductase could transform d -xylose, either in pure form or in crude hemicelluloses hydrolysate, to bio-xylitol very efficiently. This biocatalytic reaction happened without the external addition of any NAD(P)H, NAD(P) + , and auxiliary substrate as an electron donor. Our experimental design & findings reported here are not limited to the conversion of d -xylose to xylitol only but can be used with other many oxidoreductase reactions also, such as ketone reductases/alcohol dehydrogenases and amino acid dehydrogenases, which are widely used for the synthesis of high-value chemicals and pharmaceutical intermediates." @default.
• W3124763733 created "2021-02-01" @default.
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• W3124763733 date "2021-02-22" @default.
• W3124763733 modified "2023-10-16" @default.
• W3124763733 title "Production of bio-xylitol from d-xylose by an engineered Pichia pastoris expressing a recombinant xylose reductase did not require any auxiliary substrate as electron donor" @default.
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• W3124763733 doi "https://doi.org/10.1186/s12934-021-01534-1" @default.
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