Abstract: EGCG was effectively extracted from homogenates of fresh old age tealeaves by pulping and negative pressure-cavitation homogenous solid-liquid phase combined extraction technology. The extracting craftwork was compared with the traditional extraction of the old age tealeaves. The results showed that the fresh old age tealeaves were boiled to kill the enzymes firstly, the optimum combination extracting craftwork was as followed:the homogenate extract times was 1 min at normal temperature, the ratio of liquid to material was 1:10, then the homogenate filter residue was extracted by negative pressure-cavitation homogenous solidliquid phase. The EGCG content of the combined extraction was 502.85 mg. The combined craftwork with the fresh old age tealeaves was superior traditional extraction with dry ones.

Key words: EGCG, pulping, negative pressure-cavitation homogenous solid-liquid phase, extraction