A Comparative Study of Metachromasy Induced in Azure B by Anionic Polyelctrolytes

摘要

The interaction of two cationic dyes, namely, Azure B (AB) with an anionic polyelectrolyte, namely, sodium heparinate (NaHep) has been investigated by Spectrophotometric method. The polymer induced metachromasy in the dyes resulting in the shift of the absorption maxima of the dyes towards shorter wavelengths. The stability of the complexes formed between Azure B and sodium alginate was found to be greater than that formed between Azure B and sodium carboxymethylcellulose.This fact was further confirmed by reversal studies using alcohols, urea surfactants and electrolytes.The interaction parametersrevealed that binding between Azure B and anionic poloyelectrolytes was mainly due to electrostaticinteraction.