Preparation and properties of octenyl succinate β-cyclodextrin and its application as an emulsion stabilizer.

The aim of this study was to synthesize and characterize the octenyl succinic-β-cyclodextrin (OS-β-CD) and assess its application as a potential emulsion stabilizer. OS-β-CD was prepared by esterifying β-CD with OSA under alkaline conditions. The properties of OS-β-CD were characterized by Fourier transform infrared, C and H NMR spectroscopy, X-ray diffraction (XRD), which demonstrated that OS groups had been introduced into the β-CD molecules and most of OS substitution occurred at the C-6 hydroxyl group of glycosyl units. The properties of emulsions stabilized by β-CD and OS-β-CD were evaluated via surface and interface tensiometry, determination of the creaming index and droplet size. The results showed that emulsions stabilized by β-CD broke just after 24h storage at 25°C. The emulsions prepared by OS-β-CD with all degree of substitution (DS) possessed a smaller oil droplet size and improved storage stability compared with that of the emulsion generated using β-CD.