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Extracts of callus or cell suspension cultures from petioles of Ginkgo biloba catalyzed the production of (+)-gallocatechin (2,3-trans- 3,5,7,3',4',5'-hexahydroxy-flavan) from (+)-dihydromyricetin (5'-hydroxy-dihydroquercetin) along with the expected 3,4-cis-diol intermedi- ate, leucodelphinidin, in a NADPH-dependent double-step reductase reaction at pH 7.4. The latter diol, isolated from the above incubation mixture, produced (+)-gallocatechin in a NADPH-dependent reaction.
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Stafford et al. (1985) studied this question.
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