In order to explore the extraction and structure of tea polyphenols from camellia sinensis leaves,single factor and orthogonal ex-perimental design were used to optimize the extraction conditions,and identify the structure of the extract.The experimental results showed that the extraction yield of polyphenols from leaves could reach 243 mg/g under the process conditions of 70%ethanol concentration,extraction temperature of 60℃,extraction time of 100 min,and liquid/material ratio of 60 mL/g.Furthermore,the phenolic hydroxyl stretching vibration at 3276 cm-1 and the carbonyl stretching vibration at 1686 cm-1 were detected by FTIR to identify the structure of tea polyphenols.
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