脂肪族および芳香環族アミノ酸のアセチルセルロース膜による逆浸透分離における非極性効果

概要

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The reverse osmosis separation of 1mM respective aqueous solution of aliphatic or aromatic amino acids was carried out by Bio-Engineering batch cell which has a maximum 200ml capacity and 32.2 cm2 of effective membrane area under an operating pressure of 20kg/cm2 and its temperature of 30°C. The membranes used were DDS-cellulose acetate membrane, and the pH value of these solution was about 6. The correlation of the dimensionless nonpolar parameter ω*ΣS* proposed by Matsuura et al. to the rejection value of these amino acids were examined. Consequently, the rejection of these amino acids decreased in adverse manner to the increase of the absolute value of ω*ΣS*, also a close correlation was obtained between the number of carbon atoms in a nonpolar substituent of these amino acids and characteristic proportionality constant associated with ΣS*. When the nonpolar substituent was straight, the value of ω* increased as the number of carbon atom increased, but when the nonpolar substituent was branched, it decreased as the number of carbon atom increased. Results mentioned above appeared to satisfy the functional nature of ω*. In summary, it was found that the equation, ln (D/Kδ) =lnC*+ρ*Σδ*+δ*ΣEs+ω*ΣS*, which was proposed by Matsuura et al. for nonionized polar aliphatic and alicyclic organic solutes in aqueous solution is applicable for estimation of separation titer of aliphatic and aromatic amino acid aqueous solution.