The sample powder (1.0 g) was respectively suspended in 50 mL of ethyl acetate(polarity = 4.30), 90% (v/v) aqueous ethanol (polarity = 4.89), 90%(v/v) aqueous methanol (polarity = 6.69), 50% (v/v) aqueous ethanol(polarity = 7.25), 50% (v/v) aqueous methanol (polarity = 8.40), or distilled water (polarity = 10.20) and sonicated at 40◦C for 30 min with ultrasonic cleaner under its whole power altitude model (100 KHz, 300 W). The suspension was subjected to centrifugation at 2500 × g for 10 min. The super-natant was collected and the residue was re-extracted by repeatingthe procedure mentioned above