Preparation and Structural Characterization of Octenyl Succinic Anhydride Modified Inulin
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Abstract:
The preparation of octenyl succinic anhydrid (OSA) modified inulin in aqueous medium was studied. The effects of the inulin concentration, reaction temperature, pH value, the additive amount of OSA were investigated by single factor experiments with the degree of substitution (DS) as measurement index. The synthetic conditions of OSA modified inulin which were optimized by orthogonal analysis were as follows: OSA/AFU molar ratio of 0.35, temperature 30℃, pH 8.5~9.0, 25% (m/m) concentration of inulin. The structures of the product were determined by means of scanning electron microscopy(SEM),fourier transform infrared spectroscopy(FT-IR), carbon-13 and proton nuclear magnetic resonance spectroscopy (13C NMR and 1H NMR). The results showed that the surface structure of OSA modified inulin particles were damaged and lost their original smooth surface structure. Infrared datas showed that carbonyl absorption peak of ester bond appeared at 1733.72 cm-1 and alkenyl absorption peak of octenyl succinic anhydride appeared at 1569.80 cm-1. Characteristic absorption peaks of the carbonyl carbon and carboxyl carbon were appeared at 175.6 ppm and 176.5 ppm in the 13C NMR diagram. The absorption peaks of methylene protons and methyl protons in the chain of OSA molecule were discovered about 1.2ppm, 0.8ppm chemical shift in the 1H NMR diagram. These results demonstrated that the OSA group had been linked with inulin molecules by the ester bond.
