Extraction of tannins from Galla Chinensis / 中成药

AIM:To optimize the extraction process of tannins from Galla Chinensis. METHODS: Using of HPLC to assay tannins hydrolysis, gallic acid as the content index was analyzed by HPLC, the optimum extraction condition consisted of extraction temperature, the size of material, the solvent extraction times and the extraction time by orthogonal test design. RESULTS: The best condition of extraction process was 10 times the volume of water, extracted three times, 9 hours each time. CONCLUSION: The optimized process is feasible for the extraction of tannins.