추출조건에 따른 옻나무 부위별 Phenolics 함량

Abstract

This study investigated changes in phenolic contents of different parts of Rhus verniciflua Stokes (RV) according to extraction conditions. Bark and xylem parts of RV were extracted at 80, 100, 120, 140, and 160°C for 1, 3, and 5 h, respectively. Major phenolic compounds (gallic acid, protocatechuic acid, fustin, fisetin, sulfuretin, and butein) of RV were analyzed. The gallic acid, fisetin, sulfuretin, and butein contents significantly increased as extraction temperature increased. Protocatechuic acid and fustin contents increased as increasing extraction temperature to 120°C and decreased afterward. The gallic acid, protocatechuic acid, and butein contents of bark were higher than those of xylem extracts. The optimal extraction conditions of gallic acid, protocatechuic acid, fustin, fisetin, sulfuretin, and butein were 160°C/3 h (380.22 mg%), 120°C/1 h (9.25 mg%), 100°C/3 h (206.97 mg%), 140°C/5 h (93.84 mg%), 140°C/5 h (16.07 mg%) and 160°C/5 h (1.49 mg%), respectively. These results suggest that the optimum extraction temperature and time considering RV extraction yield and cost are 140°C and 3 h, respectively.