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Prediction of Optimal Microwave-Assisted Extraction Conditions for Functional Properties from Fluid Cheonggukjang Extracts

액상청국장 추출물의 기능성에 대한 마이크로웨이브 최적 추출조건 예측

  • Published : 2007.11.30

Abstract

Response surface methodology (RSM) was employed to optimize extraction conditions in order to find the maximal functional properties of fluid Cheonggukjang. Based on central composite design, a study plan was established with variations of microwave power, ethanol concentration, and extraction time. Regression analysis was applied to obtain a mathematical model. The maximum inhibitory of tyrosinase activity was found as 26.75% at the conditions of 30.56W microwave power, 2.40 g/mL of ratio of solvent to sample content and 10.00 min extraction time, respectively. The maximum superoxide dismutase (SOD)-like activity was 53.23% under the extraction conditions of 108.42 W, 4.38 g/mL and 7.84 min. Based on superimposition of three dimensional RSM with respect to extraction yield, inhibitory of tyrosinase activity and SOD-like activity obtained under the various extraction conditions, the optimum ranges of extraction conditions were found to be microwave power of $55{\sim}75$ W, ratio of solvent to sample content of $2{\sim}5$ g/mL and extraction time of $3.5{\sim}15$ min, respectively.

액상청국장의 추출공정별 청국장 추출물의 특성 비교 및 청국장의 최적 추출조건을 설정하고자 하였다. 용매로 물을 사용하여 추출한 액상청국장을 각각 마이크로웨이브 파워별(30, 60, 90, 120 및 150 W), 시간별(1, 5, 9, 13 및 17분)로 추출한 후 생리활성 실험을 수행하였을 때, 수율, 전자공여능, 아질산염 소거능, tyrosinase 저해작용, SOD 유사 활성 등의 생리활성 측정을 통해 추출 최적조건을 찾아내었다. 반응표면분석법을 이용하여 모니터링 한 결과, 액상청국장은 수율, tyrosinase 저해작용, SOD 유사활성이 일치하는 범위로 마이크로웨이브 파워 $55{\sim}75$ W, 시료에 대한 용매비 $2{\sim}5$ g/mL, 추출시간 $3.5{\sim}15$분으로 확인되었다. 예측결과에 의한 최적조건을 확인하기 위하여 예측된 최적조건 범위 내에서 임의의 조건을 대입하여 이화학적 특성을 예측해본 결과 액상 청국장에 대한 임의의 조건으로 시료에 대한 파워 60 W, 용매비 3.5 g/mL, 추출시간 13분을 설정한 후 액상 청국장에 대한 각각의 회귀식에 대입하여 얻은 예측된 최적값은 수율 24.99%, 전자공여능 75.42%, 아질산염 소거능 70.12%, tyrosinase 저해작용 15.69%, SOD 유사활성 36.16%로 실험값과 예측값 간의 유의적인 차이가 나타나지 않았다.

Keywords

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