We can locate the loss of CO2 and C2H2O in MS2 spectra from EC/C to A ring and B ring,respectively.

Detemination of epicatechin,rutin and quercetin in buckwheat by capillary electrophoresis with electrochemical detection;

Determination of Catechin and Epicatechin in NianMoKuiYang Buccal Tablet by HPLC;

Studies on the Contents of Catechin and Epicatechin in Catechu by HPLC;

Determination of (+)-catechin and (-)-epicatechin of Futongshui by RP-HPLC;

Determination of(+)-catechin and(-)-epicatechin and berberine hydrochloride in Wangying Capsule by RP-HPLC;

On the basis of chemical and spectral analysis,the compoundⅠwas identified as(-)-epicatechin belongs to flavan-3-ol.

Results: Four polyphones compounds were isolated as protocatechuic aldehyde(Ⅰ),protocatechuic acid(Ⅱ),daucosterol(Ⅲ) and(-)-epicatichin(Ⅳ).

Objective: To study the optimum process of(-)-epicatechin purification by HPD-100 macro-porous adsorption resin.

Methods The orthogonal test was used,in which the output of (-)-epicatechin was regarded as th e examining target and the influence of three factors in the extraction of effective substance were studied.

Tea catechin is a high effective and low toxic scavenger of free radical and has various pharmacological and healthy functions Its absorption,distribution,biologic transformation and excretion were summarized in this paper,so as to provide some theoretical reference for further study of tea catechi