P-sulfonatocalix[8]arene and chitosan based vesicle formation studies by spectroscopic and thermal methods

Abstract

p-sulfonatocalix [8]arene and chitosan based supramolecular amphiphilic vesicles were formed by electrostatic interaction between anionic character of calixarene and cationic chitosan molecules. UV–visible, fluorescence, dynamic light scattering and thermogravimetric analysis were performed for the characterization of p-SCX8 with chitosan. Increase in absorption and enhancement of fluorescence emission intensity attributed to vesicle formation between both calixarene and chitosan in aqueous media. Results obtained from size distribution curve of dynamic light scattering experiment gives clear evidence for vesicle formation at pH 4.98. Positive zeta potential values obtained from dynamic light scattering experiment gives the evidence for vesicle formation. Thermogravimetric analysis gives quantitative results for purity and stability of the vesicles. From overall studies we can conclude that degree of deacetylation as well as pH 4.98 of the solutions and anionic nature of pSCX8 plays important role in electrostatic interaction of vesicle formation.