STUDY ON OPTIMAL CONDITIONS FOR POLYPHENOL EXTRACTION AND POWDER PRODUCTION FROM LEAVES OF Sphagneticola trilobata (L.) Pruski

Abstract

This study aimed to investigate the optimal conditions for extracting polyphenols from the leaves of Sphagneticola trilobata (L.) Pruski and to propose a production process for polyphenol-rich powder. The factors examined included solvent type, ethanol concentration, raw material-to-solvent ratio, extraction temperature, extraction time, particle size and solvent pH. The results indicated that the optimal extraction conditions were 50% ethanol, pH 6.3, a raw material-to-solvent ratio of 1:50 (w/v), extraction temperature of 70°C, extraction time of 30 minutes and particle size of 0.125 mm. Under these conditions, the polyphenol content reached 36.139 ± 0.378 mg GAE/g with a recovery efficiency of 74.94%. The resulting powder exhibited good solubility, uniform green color and characteristic aroma, with a polyphenol recovery efficiency of 68.70%.