Phenolic acids were analyzed according to validated methods with slight modifications in HPLC elution conditions. They were
analyzed in an HPLC chromatograph system (Perkin Elmer, Flexar, USA) equipped with Diode Array Detector (DAD) and a reversedphase C18 column (Perkin Elmer ODS-2, 5 lm, 250 mm _4.6 mm)