Unequivalent chemical environment of diene groups in 1- and 2-acyl chains of polymerizable lipids analyzed by radical polymerization.
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概要
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1,2-Di-<I>O</I>-(2,4-octadecadienoyl)-<I>sn</I>-glycero-3-phosphorylcholine is polymerized by radical initiators. An azobisisobutyronitrile (AIBN) and an azobis(2-amidinopropane) dihydrochloride (AAPD) are incorporated into hydrophobic membrane region of the lipid liposomes and an aqueous medium, respectively by sonication. The use of either AIBN or AAPD gives polymerization conversion of about 50% at 60 °C. This is not improved by the elongation of polymerization period at 60 °C or the increase of the amount of these radical initiators. The lyophilized lipids thus polymerized by either AIBN or AAPD are soluble in methanol suggesting the formation of linear polymers. Simultaneous polymerization by both AIBN and AAPD provides almost complete polymerization. AIBN and AAPD have been suggested to initiate radical polymerization of diene groups in 1- and 2-acyl chains, respectively. Potassium peroxodisulfate, another water-soluble radical initiator, yields polymerized liposomes with polymerization conversion of more than 80%. This corresponds to the polymerization of diene groups of not only 2- but also 1-acyl chains due to the hydroxyl radicals which are generated by the radial transfer in an aqueous medium. These different initiation reactions are attributed mainly to the unequivalent chemical environment of diene groups in 1- and 2-acyl chains.
- 公益社団法人 日本化学会の論文
著者
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Takeoka Shinji
Department Of Applied Chemistry Graduate School Of Science And Engineering Waseda University
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Tsuchida Eishun
Department Of Applied Chemistry Waseda University
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Ohno Hiroyuki
Department Of Biotechnology And Life Science Tokyo University Of Agriculture And Technology
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Takeoka Shinji
Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University
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Tsuchida Eishun
Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University
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