Abstract
Abstract The interaction of Acridine Orange with poly(S-carboxymethyl-l-cysteine) has been investigated by observing the solubility behavior, absorption spectra, and circular dichroism of the mixture. When the dye is added to aqueous solution of the polymer, the mixture is homogeneous at higher pH, but precipitation takes place at lower pH; the threshold pH ranges from 3.5 to 6, depending on the mixing ratio. For [P]/[D] 1 or less, the mixture is again homogeneous at very low pH between 4 and 2, when no salt is added. Various type of circular dichroism are induced for the homogeneous solutions, which are characteristic of the bound dye species on the polymer and the structure of dye–polymer complex. The binding of dye with the polymer is mainly caused by electrostatic effect, and the solubility of the mixture is interpreted by considering the ionization of polymer and the binding of dye to the polymer.
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