The method of enzyme hydrolysis was used to make onionskin,then the approach of ethanol immersion extraction was used to extract flavonoid compounds of onion.Some factors of enzyme hydrolysis were studied to find out an optimum condition of the extraction.The results indicate that the optimum condition for the enzyme hydrolysis was at 45℃,pH 6~7,and 2.5‰ of enzyme dosage with 60 minutes extraction.
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