Changes of Total Polyphenol Content and Antioxidant Activity of Aster scaber Thunb Extracts with Different Microwave-Assisted Extraction Conditions

마이크로웨이브 추출조건에 따른 참취 추출물의 총 폴리페놀 함량 및 항산화작용의 변화

  • Published : 2004.03.01

Abstract

This study was conducted in order to compare reflux extraction(RE) and microwave-assisted extraction(MAE) in extraction efficiency and establish optimum microwave extraction conditions in obtaining Aster scaber Thunb extracts. Extraction time was reduced considerably in MAE. When 70% methanol, 50% methanol, 70% ethanol, or 50% ethanol was used, no difference was found in the amount of soluble solid and total phenol between MAE and RE. The optimum microwave-assisted extraction conditions for Aster scaber Thunb were achieved by 120-150 watts of microwave energy and 4∼8 minutes of extraction time. No significant changes were found in antioxidant activity using DPPH scavenging method over the variation of microwave power or extraction time. The use of diluted methanol or ethanol improved soluble solid content(30.8%), total polyphenol content(2.9%) and antioxidant activity(69% ).

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