Study on Ultrasonic-assisted Distilled Liquor Extraction of Polyphenols from Grape Pomace Powder
Grape pomace contains a large number of polyphenols,which have rich nutritional value and utilization value,but currently the extraction of its polyphenols is rarely studied and chemical solvents are mostly used,and the application range of extracts is limited.In this paper,distilled liquor was used for extraction instead of traditional water and organic solvent,and was combined with ultrasonic-assisted method to extract polyphenols from grape pomace powder,the effects of distilled liquor alcohol content,solid-liquid ratio,ultrasonic time and ultrasonic temperature on the extraction of polyphenols were discussed,and the optimal process parameters for extracting grape pomace powder were determined by response surface experiments:distilled liquor alcohol content 45％vol,solid-liquid ratio 1∶23 g/mL,ultrasonic time 30 min,ultrasonic temperature 70 ℃.The content of polyphenols in grape Opomace powder extracted under these conditions was 11.33 mg/g,which not only efficiently extracted polyphenols from grape pomace,but also greatly improved the safety of polyphenols.
grapepomaceextraction of polyphenolsultrasonicdistilled liquor
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