Study on optimization of extraction of polyphenols from shell of wild apricot by response burface methodology and its characterization

The shell of wild apricot were used as the raw material to extract polyphenols by flash-extraction,based on single factor experiments,extraction condition was optimized by response surface methodology. The results showed that the optimum conditions of extraction of the polyphenols from shell of wild apricot were as follows:63% ethanol concentration,4.2 min extraction time,23 ∶1 liquid/material ratio and 61 ℃ extraction temperature. Under this condition,the maximal content of polyphenols was up to 736.87 mg(GAE)/100 g. The results showed that the extracts contained the typical groups of polyphenols and it was stable under 240 ℃and occured of pyrolysis reaction in the temperature range of 240~580 ℃.