Production of (R)-epichlorohydrin from l,3-dichloro-2-propanol by two-step biocatalysis using haloalcohol dehalogenase and epoxide hydrolase in two-phase system

摘要

Recombinant Escherichia coli cells harbouring haloalcohol dehalogenase and epoxide hydrolase were successfully immobilized by adsorption onto perlite and used to prepare (R)-epichlorohydrin from 1,3-dichloro-2-propanol. by two-step biocatalysis in a specially designed reactor. Two-phase solution was used as the reaction system in order to improve the yield of epichlorohydrin. In the two-phase system containing 40% (v/v) cyclohexane, the yield of raeemic epichlorohydrin formed in the first step was 73%, and the yield of (R)-epichlorohydrin with enantiomeric excess (ee) >99% increased from 19.2% to 25.1% in the second step. Ultimately, the yield of (R)-epichlorohydrin reached 26.4% by optimization of the flow rate of air and amount of immobilized cells. To our knowledge, this was the first report on production of (R)-epichlorohydrin from l,3-dichloro-2-propanol by two-step biocatalysis using haloalcohol dehalogenase and epoxide hydrolase.