Optimization of polyphenol extraction from green tea leaves (Camellia sinensis) using aqueous ethanol

This study is an evidence in order to extract the highest polyphenol from green tea leaves in aqueous ethanol conditions. The response surface methodology (RSM) was used to optimize the extraction conditions of polyphenol. Four factors that effect to the extraction process are the concentration of ethanol, the solvent-material ratio, the temperature and time of extraction.