Enzyme-Modified Particles for Selective Biocatalytic Hydrogenation by Hydrogen-Driven NADH Recycling.

ABSTRACT: We describe a new approach to selective H₂-driven hydrogenation that exploits a sequence of enzymes immobilised on carbon particles. We used a catalyst system that comprised alcohol dehydrogenase, hydrogenase and an NAD⁺ reductase on carbon black to demonstrate a greater than 98 % conversion of acetophenone to phenylethanol. Oxidation of H₂ by the hydrogenase provides electrons through the carbon for NAD⁺ reduction to recycle the NADH cofactor required by the alcohol dehydrogenase. This biocatalytic system operates over the pH range 6-8 or in un-buffered water, and can function at low concentrations of the cofactor (10 μm NAD⁺) and at H₂ partial pressures below 1 bar. Total turnover numbers >130 000 during acetophenone reduc

SUBMITTER: Reeve HA 

PROVIDER: S-EPMC4648031 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature