Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Effect of Fatty Acid on the Membrane Fluidity of Liposomes

지방산 첨가가 리포좀 유동성에 미치는 영향에 관한 연구

  • Lee, JinSun (Dept. of Chemical and Biochemical Eng., Dongguk Univ.-Seoul) ;
  • Chi, Gyeong-Yup (Daegu Hanny University) ;
  • Lim, JongChoo (Dept. of Chemical and Biochemical Eng., Dongguk Univ.-Seoul)
  • 이진선 (동국대학교-서울 공과대학 화공생물공학과) ;
  • 지경엽 (대구한의대학교 한방산업대학 바이오산업융합학부) ;
  • 임종주 (동국대학교-서울 공과대학 화공생물공학과)
  • Received : 2016.12.19
  • Accepted : 2017.02.09
  • Published : 2017.04.10
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Abstract

In the present work, the interaction of fatty acid with vesicle membrane of phospholipids was investigated using 3 different kinds of fatty acids such as stearic acid (SA), oleic acid (OA) and linoleic acid (LA). Basically, the same trend has been found in 3 fatty acid systems. The addition of fatty acid produced a close packing of liposome due to the penetration of fatty acid molecules into liposome vesicles, which resulted in a decrease in size and an increase in zeta potential of liposome. However, excessive addition of fatty acid produced a transition from liposomes to aggregates of lipid particles having polymorphic structure. The membrane fluidity, characterized by measuring membrane deformability and fluorescence anisotropy ratio of liposomes, was in good agreement with measurement results of transmission electron microscopy (TEM) and particle size. The minimum size and closest packing of liposome with SA, OA and LA were found when the molar ratios of fatty acid to lecithin were 0.70, 0.50, and 0.25 respectively.

본 연구에서는 스테아르산(SA), 올레산(OA), 리놀레산(LA) 등의 지방산이 지질 소포체 막과의 상호 작용에 미치는 영향에 관하여 살펴보았다. 이를 위하여 지방산 종류 및 농도 변화에 따른 리포좀 평균 입자 크기 및 제타 전위, 리포좀 막의 deformability, fluorescence anisotropy ratio 등을 측정하고 TEM 관찰을 통하여 지방산 첨가가 리포좀 막의 유동성 변화에 미치는 역할에 관하여 살펴보았다. 기본적으로 SA, OA, LA 등의 지방산 첨가는 동일한 경향을 나타내었다. 즉, 지방산을 첨가함에 따라 리포좀이 보다 치밀한 패킹을 갖게 되어서 리포좀의 크기는 감소하고 제타 전위 값은 증가하였으나, 지방산의 과도한 첨가는 리포좀에서 다형(polymorphic) 구조를 가지는 지질 입자 응집체로의 전이를 일으켰다. SA, OA 및 LA 지방산 시스템에서의 최소 리포좀 크기와 가장 치밀한 리포좀 패킹은 레시틴 대비 지방산의 몰 비율이 각각 0.70, 0.50, 0.25인 조건에서 관찰되었으며, 리포좀 막의 deformability와 fluorescence anisotropy ratio 측정에 의한 리포좀 막의 유동성 측정 결과는 TEM 및 입자 크기 측정 결과와 일치함을 알 수 있었다.

Keywords

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