Coil-helix transition has been studied for poly(L-lysine) salts, with counterion species C1- (PLLHC1), Br- (PLLHBr) and NO3 (PLLHNO3), in aqueous alcohol mixtures (water/MeOH, EtOH, 2PrOH, tBuOH) as a function of the alcohol composition and/or salt concentration. The dependence of the helix content on the solvent species and composition is interpreted in terms of the three solvent properties i.e. dielectric constant, Gutmann-Mayer acceptor number and water activity, which have been found to be critical for contact ion-pair formation in the study of poly(L-glutamic acid). The salt-induced transition is also analysed by taking account of the contact ion-pair formation. Comparisons are made with the results on the poly(L-glutamic acid) systems
Посилання на статтю:
Solvent-induced and salt-induced coil-helix transition of poly(L-lysine) salts in water/alcohol mixtures / Mitsuru Satoh*, Tetsuya Hirose and Jiro Komiyarna // Polymer. – 1993. – Vol 34. – P. 4762-4766.