Structure and Properties of Octenyl Succinate Starch and Alginate Composite Films
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Abstract:
In order to obtain film carrier materials for microencapsulating the functional factors targeting the lower end of the human digestive tract, this study regulated the carrier performance of octenyl succinate starch (OSAS)-sodium alginate composite film by changing the substitution degree of OSAS, molecular weight of OSAS, and sodium alginate-to-OSAS ratio of the composite. The effects of sodium alginate-to-OSAS ratio of the composite, and the substitution degree and molecular weight of OSAS on the film structure and carrier properties of OSAS-alginate composite films were studied by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and small-angle X-ray scattering (SAXS). Results indicated that sodium alginate interacted with OSAS molecules via hydrogen bonding. The increase in the proportion of sodium alginate and the degree of OSAS substitution along with a moderate decrease in the molecular weight of OSAS could promote the formation of ordered microdomains of the composite film and induce a decrease of the dissolution rate for the composite film in gastric juice by 12.10%~18.90%. In addition, increasing the proportion of sodium alginate and OSAS substitution could induce the reduction of the fast-digested components of the composite film by 3.6%~18.5% and the increase of the anti-digestion components by 11.1%~29.9%. The results laid the foundation for the OSAS-sodium alginate composite film as a carrier material of the delivery systems for functional factors targeting the end of the small intestine end or the colon.
