Optimization of microwave-assisted extraction on polyphenol metabolite from <i>Eleutherine bulbosa</i> (Mill.) urb. bulbs using response surface methodology.

Therefore, for the highest rate of polyphenol extraction, the ideal balance between the extraction time and the ethanol concentration should be sought because the quadratic and linear effects were highly significant ( P < 0.01) and increased the TPC yield for all microwave powers and extraction times, the ethanol concentration primarily influenced the response of TPC value.

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