Abstract: A new extracting technique for polyphenol from Chinese jujube was conducted using core of Gold mini jujube as raw material and catechol as standard sample.The content of polyphenol in core of Gold mini jujube had been measured by tartrate-Fe method.To optimize the conditions for the extraction of polyphenols from core of Gold mini jujube,extraction was studied by single factor and orthogonal experiment.Results showed that the successive order of factors affecting extraction was solid/liquid ratio＞pH＞extraction temperature＞extraction time.Thus,the feasible conditions for extraction of Gold mini jujube core polyphenol were determined to be alcohol concentration 80% of pH 3 at 50℃ for 12 h and the ratio of solid to liquid as 1∶30.The content of Gold mini jujube core polyphenol is 9.770 mg/g.This study provided a good-way for the exploitation and using of the by product of the Chinese jujube.

Key words: Chinese jujube, Polyphenol, Tartrate Fe method, Orthogonal experiment, Extraction process

CLC Number: 

• S665.1