| 摘要 |
Epigallocatechin gallate (EGCG) is obtained by subjecting a green tea extract to chromatography on a macroporous polar resin; eluting EGCG from the resin with a polar elution solvent; optionally concentrating the eluate; optionally regenerating the resin by desorbing the remaining catechins; and optionally concentrating the desorbed catechins. The invention relates to a green tea fraction comprising at least 91.7 weight-% of (-)-epigallocatechin gallate (EGCG) and from 0 to 3.15 weight-% of EC. The green tea fraction may preferably also contain from 0 to 3.1 weight-% of catechin, from 0.2 to 1.52 weight-% of GCG, from 0.38 to 4.62 weight-% of ECG and/or from 0 to 1.43 weight-% of caffeine. The present invention is also directed to a health care preparation comprising (-)-epigallocatechin gallate (EGCG) whereby the EGCG is a green tea fraction containing at least 75% of EGCG, calculated based on the total amount of catechins present in the preparation.
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