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논문 상세정보

반응표면분석법을 이용한 차가버섯(Inonotus obliquus)의 생리활성물질 최적 추출조건 탐색

Optimization of the Extraction of Bioactive Compounds from Chaga Mushroom (Inonotus obliquus) by the Response Surface Methodology

초록

본 연구에서는 차가버섯(Inonotus obliquus)의 유효성분과 항산화능이 최대가 되는 추출물의 제조를 위하여 반응표면분석법을 이용하여 최적 추출조건을 탐색하였다. 추출 수율, 총 폴리페놀 함량, 항산화능(ABTS 자유 라디칼 소거능, ORAC), ${\beta}$-1,3-glucan 함량의 총 다섯 가지 반응변수에서 유의적인 이차 회귀식을 얻었고, 반응표면그래프와 등고선도를 통하여 최적 추출조건을 예측하였다. 각 반응변수에 따른 최적 추출조건은 추출 수율에서 50% (v/v), $88.7^{\circ}C$, 14.5 h, 총 폴리페놀 함량에서 9.2%, $92.7^{\circ}C$, 14.5 h, ABTS free radical scavanging activity에서 50.8%, $92.7^{\circ}C$, 14.5 h, ORAC에서 9.2%, $92.7^{\circ}C$, 1.5 h, ${\beta}$-1,3-glucan 함량에서 90.8%, $92.7^{\circ}C$, 1.5 h으로 예측되었다. 각 반응변수의 예측 최대추출조건에서 실제 실험을 실행하여 예측 값과 비교해본 결과, 상대오차는 0.4-12.5%였다. 각 반응 변수에서 유의적인 이차 회귀식을 얻었으며, 예측 값과 실험 값의 오차가 크지 않아 반응표면모델이 최적 추출조건을 예측하는데 적합하다고 판단하였으며, 다섯 가지 반응 변수를 통합하는 최적 추출조건은 81.4%, $92.7^{\circ}C$, 14.5 h으로 예측하였다. 본 연구는 주로 열수추출물의 형태로 유통되는 차가버섯 추출물의 품질 개선을 위하여 에탄올 용매를 포함한 최적 추출조건을 설정하였고, 구체적인 추출 수율과 생리활성물질 함량 및 항산화능이 최대가 되는 추출조건을 제시하였다.

Abstract

This study determined the optimum extraction conditions based on five response variables (yield, total phenolics, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) free radical scavanging activity, oxygen radical absorbance capacity (ORAC), and ${\beta}$-1,3-glucan content) in chaga mushroom (Inonotus obliquus) using the response surface methodology, where three independent variables (ethanol concentration, extraction temperature, and extraction time) were optimized using a central composite design. The optimum ethanol concentration, extraction temperature, and extraction time were 50% (w/w), $88.7^{\circ}C$, and 14.5 h; 9.2%, $92.7^{\circ}C$, and 14.5 h; 50.8%, $92.7^{\circ}C$, and 14.5 h; 9.2%, $92.7^{\circ}C$, and 1.5 h; and 90.8%, $92.7^{\circ}C$, and 1.5 h for yield, total phenolics, ABTS, ORAC, and ${\beta}$-1,3-glucan content, respectively. The predicted values of the response variables were compared with those of the extracts under the optimal extraction conditions to verify the models. The optimum extraction condition for the five response variables was predicted to be 81.4% ethanol at $92.7^{\circ}C$ for 14.5 h.

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