Response surface optimization and characterization analysis of octenyl succinic acid oat starch ester prepara-tion process
After extracting oat starch from oats,it was subjected to hydrophobic modification using octenyl succinic anhydride with degree of substitution and substitution efficiency as the evaluation criteria.The influencing factors of the reaction for pre-paring octenyl succinic anhydride oat starch ester were studied,and the optimal process parameters were determined through re-sponse surface optimization:starch concentration of 37%,reaction time of 2.4 h,reaction temperature of 34.4℃,pH of 7.9,and a confirmed OSA addition of 3%.Under these conditions,an octenyl succinic anhydride oat starch ester with DS of 0.023 0 was obtained.Characterization was performed using FT-IR and SEM,which revealed the appearance of ester carbonyl C=O(at a wavelength of 1 724.53 cm-1)and carboxyl RCOO-(at a wavelength of 1 571.70 cm-1)stretching vibration characteristic peaks in the infrared spectrum of the octenyl succinic anhydride oat starch ester.Scanning electron microscopy results indicated that the hydrophobic modification mainly occurred in the amorphous region on the surface of the starch granules,the non-crys-talline region,which essentially did not affect the internal crystalline region of the granules,confirming the successful prepara-tion of the octenyl succinic anhydride oat starch ester.This provides a theoretical basis for the development of octenyl succinic anhydride oat starch ester and serves as experimental reference for enriching the utilization of oat starch and the development of novel food-grade octenyl succinic anhydride starch esters.
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