AnalysisofphenolicacidsbyHPLC Phenolic acid of extract was measured using HPLC analysis system (E2695, Waters Co., Mass., U.S.A.) according to the method of Abdel-Aal and Rabalski (2008). A supelcosil LC 18 column (25 cm × 4.6 mm, Supelco Co., Pa., U.S.A.) was used at 25 ◦C. The separated phenolic acids were detected at 3 wavelenths (260, 270, and 320 nm) with photodiode array detector (PDA, waters 2998, Waters Co.). Protocatechuic acid and ρ-hydrobenzoic acid were detected at a wavelength of 260 nm, gallic acid, vanillic acid, and syringic acid at 270 nm, and ρ-coumaric acid, ferulic acid, and sinapic acid at 320 nm. The mobile phase consisted of 6% formic acid (solvent A) and acetonitrile (solvent B). The flow rate was kept at 1 mL/min for total running time of 60 min, and the gradient program was as follows; 100% A to 82% A at 0 to 35 min, 82% A at 35 to 40 min, 82% A to 100% A at 40 to 42 min, 100% A at 42 to 60 min.