Abstract
This work is to extract flavonoids using ethanol refluxing method from the Kandelia candel leaves which are rich in flavonoids. Ethanol concentration, solid-liquid ratio, temperature and extraction time on the extraction rate were investigated by the single factor experiments. Box-Behnken design (BBD) based on response surface methodology (RSM) was adopted to optimize the parameters. The results showed the best extracting rate was more than 7.74%, when the extraction parameters were ethanol concentration 60%, extraction time 0.5 h and temperature 80°C.
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