Aronia melanocarpa is rich in polyphenols,which have various biological activities.Extracting polyphenols from it can be applied in food processing.By ultrasonic-assisted extraction of polyphenols from Aronia melanocarpa,three significant factors were determined by single factor test,which were solid-liquid ratio,temperature and pH.The optimized extraction process was obtained by response surface test,and the antioxidant capacity of polyphenols was further studied.The optimal extraction process was as follows:solid-liquid ratio 1∶53(g/mL),temperature 34 ℃,pH 6,and extraction time 25 min,and polyphenol yield was 0.84 mg/g.The scavenging rates of the polyphenols of Aronia melanocarpa on the free radicals of 1,1-diphenyl-2-trinitrophenylhydrazine(DPPH),2,2'-hydrazine bis(3-ethyl Benzothiazole line-6-sulfonic acid)diamine salt(ABTS)and hydroxyl radical were 97.59％,89.41％and 81.56％,respectively,indicating that the polyphenols of Aronia melanocarpa had good antioxidant properties.
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