Optimization of Extraction Technology and Properties of Polyphenols from Aronia melanocarpa and Study on Antioxidant Activity
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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