Optimization of Ultrahigh-Pressure Extraction of Polyphenolic Antioxidants from Green Tea by Response Surface Methodology

A new extraction technique, ultrahigh-pressure extraction, was used to obtain antioxidants from green tea. The response surface methodology was employed to optimize the extraction process. The effects of ethanol concentration ( x 1 , 33.2–66.8 %), pressure ( x 2 , 281.8–618.2 MPa), and liquid/solid...

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