Study on physicochemical properties of resistant starch prepared from sweet potato starch

Sweet potato resistant starch were prepared by using enzymatic de-branching combined ultrasonic treatment,then partial physicochemical properties including particle size distribution,crystal structure,thermal properties were studied.Results showed that there were significant difference in the particle size distribution,mean diameter,crystal structure,and melt temperature between sweet potato resistant starch and sweet potato starch. The resistant starch exhibited significantly higher overall size,peak gelatinization temperature,conclusion temperature than sweet potato starch.X-ray diffraction patterns indicated that the crystal structure of native starch was C type and that the crystal structure of resistant starch was B type. Results showed that enzyme hydrolysis modification combined ultrasonic treatment could prepare high content of resistant starch.