Polycarboxylated derivatives of beta-cyclodextrin

The synthesis of polycarboxylated derivatives of \u3b2-cyclodextrin obtained by reacting maleic anhydride and suitable thiolic compounds is described. The derivatives were characterised by potentiometric analyses and 13C-NMR spectra. The products obtained show a great solubility in water, but also in ethanol and methanol and act as complexing agents for many bivalent metallic cations. These derivatives are probably biodegradable and non toxic