ABSTRACT
Objective To research the extraction conditions of cinnamon polyphenols with defatted cinnamon bark powder. Methods Cinnamon bark powder was extracted by supercritical carbon dioxide extraction to de-fat firstly and then the effects of extraction time, ethanol concentration, ratio of feed to liquid, and extraction temperature on the extraction ratio of polyphenols were investigated in detail. Results The result shows that the optimum extraction conditions of cinnamon polyphenols from the defatted cinnamon bark powder are: extraction time 2 h, ethanol concentration 55%, feed liquid ratio 1:8, and temperature 60 ℃. Under the above conditions, the extracted ratio of the polyphenols from the defatted cinnamon bark powder went up to 106.4 mg/g and the yield of cinnamon bark extract went up to 20.7%. The content of polyphenols in the dry extract was 51.4%, which was much higher than that from the original cinnamon powder while the content of coumarin of the extract was 104 μg/g. Conclusion The defatting of cinnamon powder by supercritical carbon dioxide extraction in advance can greatly increase the yield of cinnamon polyphenols and reduce the content of coumarin in the cinnamon bark extract.