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SEPARATION OF THEAFLAVINS OF BLACK TEA. HIGH-SPEED COUNTERCURRENT CHROMATOGRAPHY VS. SEPHADEX LH-20 GEL COLUMN CHROMATOGRAPHY

Authors: Qizhen Du; Heyuan Jiang; Yoichiro Ito;

SEPARATION OF THEAFLAVINS OF BLACK TEA. HIGH-SPEED COUNTERCURRENT CHROMATOGRAPHY VS. SEPHADEX LH-20 GEL COLUMN CHROMATOGRAPHY

Abstract

Performance of two chromatographic techniques, high-speed countercurrent chromatography (HSCCC) and conventional Sephadex LH-20 gel column chromatography (GLC), was compared in the separation of theaflavins from the extract of 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 eluting the lower aqueous phase at 2 mL/min at 800 rpm where 200 mg of the sample was resolved into three peaks corresponding to theaflavin, theaflavin-3,3'-gallate, and a mixture of theaflavin-3-gallate and theaflavin-3'-gallate in 4.1 hrs. Although, Sephadex column chromatography yielded a similar separation for 100 mg of the same sample, it required a much longer elution time of 21 hrs.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
16
Average
Top 10%
Average
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