Extraction and Composition of Bound Lipids in Naked Barley

쌀보리 결합지질의 추출과 그 조성에 관한 연구

  • Kim, Hae-Gyoung (Dept. of Food Science and Nutrition, Pusan National University) ;
  • Kim, Bok-Nam (Dept. of Food Science and Nutrition, Dankook University) ;
  • Choi, Hong-Sik (Dept. of Food Science and Nutrition, Pusan National University)
  • 김혜경 (부산대학교 식품영양학과) ;
  • 김복남 (단국대학교 식품영양학과) ;
  • 최홍식 (부산대학교 식품영양학과)
  • Published : 1989.03.01

Abstract

Bound lipids(BL) of naked barley(Hordeum vulgare L.) were extracted by different methods and the composition of BL was determined by the procedures of column chromatography, thin layer chromatography and gas chromatography. For the extraction, after free lipids were removed from barley flour by petroleum ether(PE) extraction and then BL were extracted from PE treated flour by the solvent systems of water-saturated butanol(WSB) at $25^{\circ}C$(WSB-LT) and at $95^{\circ}C$ (WSB-HT). BL were extracted by WSB-HT with higher extraction yield as 1.5% as dry basis of flour. The contents of neutral lipids(NL), glycolipids(GL) and phospholipid(PL) in BL were $20.7{\sim}35.5%$, $28.7{\sim}32.4%$, $32.1{\sim}50.6%$, respectively with particularly higher content of PL in WSB-HT as 50.6%. Digalactosyl-diglycerides $(40.2{\sim}44.8%)$, monogalactosyl-diglycerides $(20.3{\sim}31.1%)$, sterly glycerides$(11.2{\sim}15.2%)$ and cereb rosides$(11.6{\sim}12.9%)$ were observed in GL. Of the PL in BL, lysophosphatidyl choline, phosphatidyl choline and phosphatidyl serine, and phosphatidyl ethanolamine were the major components. The predominent fatty acids of NL, GL and PL were linoleic and palmitic acids, however, no significant difference was observed in the composition of fatty acids between two extraction methods.

쌀보리가루에서 결합지질을 방법을 달리하여 추출하고 이들을 중성지질, 당지질, 인지질등으로 분획하였으며 다시 이 분획된 성분들의 구성 지질들을 분별 정량한 다음 각 지질들의 지방산 조석을 분석하였다. Water saturated butanol ($25^{\circ}C$, WSB-LT) 추출 결합지질에서는 중성, 당, 인지질의 함량이 각각 35.5%, 32.4%, 32.1% 그리고 WSB($95^{\circ}C$, WSB-HT)추출 결합지질에서는 인지질의 함량이 50.6%로 가장 많았다. 중성지질 성분중 대부분을 차지하는 성분중 대부분을 차지하는 것은 triglyceride$(66{\sim}82.9%)$이고 그외 free fatty acid, free sterol, diglycericte, esterified sterol 등이 분별정량되었으며, 당지질 성분중에서는 digalactosyl diglycerides, cerebrosides, steryl glycosides, monogalactosyl diglycerides등이 주요 구성성분이였고 이중 digalactosyl diglyceride$(40.2{\sim}44.8%)$의 함량이 가장 많았다. 인지질의 경우에는 lysophosphatidyl choline $(20.3{\sim}34.4%)$, phosphatidyl choline & phsphatidyl serine$(18.6{\sim}22.5%)$, phosphatidyl ethanolamine$(18.4{\sim}28.2%)$, dtphosphatidyl glycerols $(10.5{\sim}16.9%)$등으로 그 성분이 구성되어 있었으며, 대체로 구성성분은 추출방법에 따른 차이를 발견할 수 있었으나 인지질외에는 그 차이가 심하지 않았다. 또한 쌀보리에서 추출한 결합지질의 주요 지방산은 linoleic acid와 palmitic acid로서 추출방법에 따른 지방산 조성의 큰 차이점은 없었으며, 특히 중성지질에서는 palmitic acid 함량이 $34.3{\sim}38.2%$, linoleic acid 함량이 $44.2{\sim}48.8%$였다.

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