Extraction and Purification of EGCG(Epigallocatechin Gallate) from Green Tea

녹차로부터 EGCG(Epigallocatechin Gallate)의 추출 및 정제

  • Published : 1999.10.01

Abstract

A green tea used in this experiment was cultivated at Bosung (Chonnam) and purchased from a domestic market. The extract at 5$0^{\circ}C$ water from the powder of green tea partitioned with chloroform and ethyl acetate. The resulting solution was further purified with a chromatographic column (4.6$\times$250 mm, 15${\mu}{\textrm}{m}$, Lichrospher 100RP-18). Finally separation was achieved on a $\mu$-Bondapak $C_18$(3.9$\times$300mm, 10${\mu}{\textrm}{m}$) column. The elution order of the catechin compounds contained in the green tea was EGC(Epigallocatechin, C(catechin), EC(Epicatechin), EGCG(Epigallocatechin Gallate) and ECG(Epicatechin Gallate). From the experimental results the mobile phase for isolating EGCG from the extract consisted of 0.1% acetic acid in water/acetonitrile, 87/13%(v/v). The flow rate of mobile phase was 1.0 $m\ell$/min, and UV wavelength was fixed at 280 nm. 121.3 mg of EGCG, higher than 98% of purity, was obtained from 5 g of dry green tea.

실험에 사용된 녹차는 전남 보성에서 재배된 것으로 국내시장에서 구입하였다. 녹차 5g을 순수한 물 5$0^{\circ}C$에서 추출한 후 클로로포름과 에틸아세테이트로 분배하였다. 추출액을 크로마토그래픽 컬럼 (4.6$\times$250 mm, 15$\mu\textrm{m}$, Lichrospher 100RP-18)을 이용하여 정제하였다. 정제된 추출액으로부터 $\mu$-Bondapak $C_18$(3.9$\times$300mm, 10$\mu\textrm{m}$) 컬럼을 이용하여 녹차에 포함된 카테킨 화합물을 분리하였으며, EGC(Epigallocatechin, C(catechin), EC(Epicatechin), EGCG(Epigallocatechin Gallate) and ECG(Epicatechin Gallate)의 순으로 용출되었다. 본 연구의 결과로서는 목적물질인 EGCG를 분리하기 위해 이동상의 조성은 0.1%의 아세트산이 포함된 물/아세토나이트릴, 87/13 %(v/v)이었다. 유량은 1.0 $m\ell$/min, UV 검지기는 280nm로 고정하였다. 위의 실험조건으로 5g의 전남 보성산 녹차로부터 순도 98% 이상의 121.3mg EGCG를 얻을 수 있었다.

Keywords

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