Determination of 4-Allyl Resorcinol and Chavibetol from Piper betle Leaves by Subcritical Water Extraction Combined with High-Performance Liquid Chromatography

A method has been developed for the determination of 4-allyl resorcinol and chavibetol from Piper betle leaves using subcritical water extraction combined with high-performance liquid chromatography. Several important parameters, such as effect of extraction temperature, solvent, particle size, flow rate and duration time of extraction were comprehensively optimized. The method showed good linearity in the range of 0.2-30 mu g/mL, good correlation coefficients 0.9999 for all studies, acceptable reproducibility (RSD 0.16-5.43, n = 3), low limit of detection (0.1 mu g/mL), satisfactory average recoveries of (92.22 to 111.05 %) from subcritical extraction with water with RSDs of 0.31 to 7.96 % whereas, the average recoveries from subcritical extraction with methanol-water ranged from (96.58 to 110.72) with RSDs of 0.79 to 8.09 %. The method exhibit high extraction yield in range of (1.51 to 34.64 % w/w) obtained from subcritical extraction with water whereas for subcritical extraction with methanol-water the yield obtained in range of (2.08 to 9.06 % w/w). It was found that subcritical extraction with water offered improved extraction efficiency in extraction of the target compounds compared to subcritical extraction with methanol-water.