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Extracts of cell suspension cultures from Douglas fir (Pseudotsuga menziesii) needles catalyzed the production of (+)-catechin (2,3-trans flavan-3-o1) from the 2,3-trans-flavan,3,4-cis-diol (leucocyanidin) in a NADPH-dependent reductase reaction at pH 7.4. Catechin was also produced, along with the 3,4-cis-diol, in a double step reduction from (+)-dihydroquercetin. It was necessary to eliminate any thiol such as 2-mercaptoethanol or dithiothreitol from the extract or assay mixture because these thiols apparently formed thioethers with the 3,4-diols.
Stafford et al. (Sat,) studied this question.
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