화학공학소재연구정보센터
Clean Technology, Vol.17, No.3, 266-272, September, 2011
초임계 이산화탄소를 이용하여 추출된 멸치 오일의 지방산 조성 및 산화 특성
Fatty Acid Composition and Oxidative Properties of Anchovy Oil Extracted by Supercritical Carbon Dioxide
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초록
초임계 이산화탄소 및 유기용매를 이용하여 동결 건조된 멸치 시료로부터 오일을 추출하였으며, 시료는 700 μm로 균질화시켜 사용하였다. 다양한 압력 (15~25 MPa) 및 온도 (40~60 ℃) 조건에서 실험을 수행하였으며, 22 g/min의 일정한 유량을 추출기로 유입시켰다. 추출된 오일의 지방산 조성을 확인하기 위하여 가스 크로마토그래피를 이용하여 분석한 결과 추출된 멸치 오일에는 myristic acid, palmitic acid, stearic acid, palmitoleic acid, eicosapentaenoic acid (EPA), 그리고 docosahexaenoic acid (DHA)가 주요 지방산으로 확인되었다. 추출된 오일 내 EPA 및 DHA와 같은 고도불포화지방산 (PUFAs)함량을 비교하였을 때, 유기용매 추출 오일보다 초임계 이산화탄소를 이용하여 추출한 오일의 고도 불포화 지방산 함량이 더 높았다. 산화도 비교 실험인 산가 및 과산화물가 값을 측정한 결과, 유기용매 추출 오일보다 초임계 이산화탄소를 이용한 추출 오일의 산화도가 유의적으로 낮았으며, 산화되는 속도 또한 느리게 진행되는 것을 확인할 수 있었다.
Anchovy oil was extracted using supercritical carbon dioxide (SCO2) and organic solvents. Extraction was carried out at temperature range from 40 to 60 ℃, and pressure range from 15 to 25 MPa. The flow rate of CO2 (22 gmin.1) was constant entire the extraction period of 1.5 h. The fatty acid composition of anchovy oil was analyzed by gas chromatography (GC). The main fatty acids of anchovy oil were myristic acid, palmitic acid, stearic acid, palmitoleic acid, EPA (eicosapentaenoic acid), and DHA (docosahexaenoic acid). In addition, the oil obtained by SCO2 extraction contained a higher percentage of polyunsaturated fatty acids especially EPA and DHA comparing to the organic solvent extracted oil. The oxidative stability of oils extracted from Anchovy by SCO2 extraction was compared to those extracted by organic solvents. Results showed that the storage periods of oils obtained by SCO2 extraction were longer than those of organic solvents extraction.
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