Penetration of lysine hydrochloride into lecithin monolayers from underlying aqueous solutions.
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概要
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The surface pressure of the monolayers of dimyristoyl phosphatidylcholine (DMPC) on lysine mono- and dihydrochloride solutions was measured and the amount of positively charged lysine which had penetrated into a DMPC monolayer was calculated by successive approximation. The amount of penetration was smaller for lysine monohydrochloride than for the dihydrochloride. Moreover, both were smaller than that of uncharged lysine because mono- and dihydrochloride are more hydrophilic than uncharged lysine. The average area per molecule in the monolayer consisting of lysine and DMPC, <I>A</I><SUB>23</SUB>, was obtained. In the case of charged lysine, <I>A</I><SUB>23</SUB> increased with the mole fraction of lysine in a monolayer, <I>X</I><SUB>2</SUB>, in contrast it decreased with <I>X</I><SUB>2</SUB> in the case of uncharged lysine. The partial molecular area of positively charged lysine was considerably larger than that of uncharged lysine. This indicates that the remarkable expansion of a monolayer is caused by the penetration of positively charged lysine because of electrostatic repulsion in the monolayer. The effect of sodium chloride on the adsorption of lysine was also investigated, but the amount adsorbed was independent of the presence of 0.5 mol dm<SUP>−3</SUP> sodium chloride.
- 公益社団法人 日本化学会の論文
著者
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OKAMURA Emiko
Faculty of Pharmaceutical Sciences, Himeji Dokkyo University
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Nakagaki Masayuki
Faculty of Living Science Osaka City University
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