Hydrogen Peroxide → 3,4,6-Trihydroxy-8-((2R,3R)-3,5,7-trihydroxychroman-2-yl)-1-((2R,3S)-3,5,7-trihydroxychroman-2-yl)-5H-benzo[7]annulen-5-one

Participants

Reaction Steps

C (catechin) (0.8 g) and EGC (0.8 g) were dissolved in a mixture of acetone-pH 5.0 phosphate citrate buffer (1:10, v/v, 50 mL), which contained 4 mg horseradish peroxidase. While being stirred, 2.0 mL of 3.13% H2O2 was added four times during 45 minutes. The reaction mixture was extracted by ethyl acetate (50 mL×3). After concentration, the residue was subjected to Sephadex LH 20 column eluted with acetone-water solvent system (45%). 120 mg neotheaflavin was obtained.

Provenance & Evidence