Separation of theaflavins of black tea. High-speed countercurrent chromatography vs. sephadex LH-20 gel column chromatography

Performance of two chromatographic techniques, high-speed countercurrent ch romatography (HSCCC) and conventional Sephadex LH-20 gel column chromatogra phy (GLC), was compared in the separation of theaflavins from the extract o f black tea leaves. The HSCCC run was carried out with a two-phase solvent system composed of hexane/ethyl acetate/methanol/water (1:3:1:6, v/v) by el uting the lower aqueous phase at 2 mL/min at 800 rpm where 200 mg of the sa mple was resolved into three peaks corresponding to theaflavin, theaflavin- 3,3'-gallate, and a mixture of theaflavin-3-gallate and theaflavin-3'-galla te in 4.1 hrs. Although, Sephadex column chromatography yielded a similar s eparation for 100 mg of the same sample, it required a much longer elution time of 21 hrs.