Abstract
The binding properties of a representative poly(sulphopropylbetaine) towards a series of optical (methyl orange (MO) and 2-(4′-hydroxybenzenazo)benzoate (HABA)), fluorescent (8-anilinonaphthalene-1-sulphonate (ANS)) and chemically reactive (6-nitrobenzisoxazole-3-carboxylate (S)) anionic probes have been studied in dilute aqueous solution. The slight ultra-violet spectra modification for MO and HABA, the enhanced fluorescence of ANS and the moderate increase of the decarboxylation rate of S induced by the poly(zwitterion) show that binding of the various anionic probes to the macromolecular chain actually occurs through specific ion-dipole interactions, but that the intrinsic properties of the bound species are only weakly modified with respect to those of the free ones. Dehydration of the bound probe is very limited, and the polarity of its microenvironment close to the polymer chain is analogous to that of methanol. In spite of a relatively weak expansion, the poly(zwitterion) coil does not show microdomains of definite hydrophobicity.
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