Using Ultrasound-Assisted Solvent Extraction of Phenolic Compounds from Curcuma aromatica Salisb. Rhizomes

Abstract

An effect of using ultrasound-assisted solvent extraction of phenolic compounds from Wan nang kham (Curcuma aromatica Salisb.) rhizomes was investigated. In the extraction process, 3 experimental parameters affected on extraction such as ethanol concentration, temperature extraction and time extraction were used to determine the optimum extraction condition of phenolic compounds from the sample.  The results suggested the optimum extraction condition was 50% (v/v) of ethanol concentration and ultrasonic extraction at 30 ºC for 120 min. This condition gave the crude extract yield of 23.50% on dry basis and the highest total phenolic contents of 120.83 µg GAE/g dry weight. The antioxidant activities of crude extract from the optimum extraction condition was further investigated by the 1,1-diphenyl-2-picrylhydrazyl (DPPH). The results revealed the crude extract exhibited relatively high antioxidant activities with IC₅₀ values of 7,945.32 µg/mL based on crude extract.