Preparation and properties of konjac glucomannan octenyl succinate modified by microwave method

Konjac glucomannan (KGM) was esterified with octenyl succinic anhydride (OSA) by using microwave method under the alkalescent condition. The structure of the product—konjac glucomannan octenyl succinate (KGOS)—was characterized by means of 1H NMR spectrum, fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and X-ray diffraction, which drew conclusions that the OSA groups had been grafted onto the KGM molecular, while, incomplete deacetylation reaction occurred. All reactions occurred mainly on the surface of KGM granules, and had no significant effect on the crystallinity of the powder. In the end, the product emulsibility was also assessed, which indicated KGOS was a new kind of polymeric surfactant with good abilities both in hydrophilic and lipophilic. Konjac glucomannan (KGM) was esterified with octenyl succinate anhydride (OSA) by using microwave method under the alkalescent environment. The 1H NMR spectrum of the product—konjac glucomannan octenyl succinate (KGOS)—indicated that OSA esterification reaction and incomplete deacetylation reaction had simultaneously happened during the process. This new kind of polymeric surfactant with sound emulsifying and thickening properties is reported for the first time, and has potential applications. [Display omitted]