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Physicochemical characterization of α-, β-, and γ-cyclodextrins bioesterified with decanoate chains used as building blocks of colloidal nanoparticles.

Nanoparticles of amphiphilic α-, β-, and γ-cyclodextrins were obtained by formulation of cyclodextrins enzymatically transesterified with vinyl decanoate. The product of this synthesis is a mixture of bioesterified cyclodextrins with various degrees of substitution (DS) presenting for a same DS different regio-isomers. In a first step, the efficiency of a MALDI-TOF procedure to characterize the average molecular weight of the derivative bulk mixture was demonstrated by comparing the results with those obtained from complementary NMR and HPLC techniques. In a second step, the ultrastructure of nanoparticles prepared from three different batches of synthesis was investigated and correlated with the average molecular weight and DS of the parent derivative.