Study on multiscale structures and digestibility of cassava starch and medium-chain fatty acids complexes using molecular simulation techniques

文献类型： 外文期刊

第一作者： Shang, Wenting

作者： Shang, Wenting;Li, Xin;Du, Jinyu;Guo, Yuxin;Fu, Dekun;He, Yanfu;Zhang, Weimin;Shang, Wenting;Li, Xin;Du, Jinyu;Guo, Yuxin;Fu, Dekun;He, Yanfu;Zhang, Weimin;Shang, Wenting;Li, Xin;Du, Jinyu;Guo, Yuxin;Fu, Dekun;He, Yanfu;Zhang, Weimin;Pan, Fei;Zhou, Zhongkai

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关键词： Cassava starch -fatty acids complexes; Structural characteristics; Starch in vitro digestibility; Molecular simulation

期刊名称：FOOD RESEARCH INTERNATIONAL （ 影响因子：8.1； 五年影响因子：7.7 ）

ISSN： 0963-9969

年卷期： 2024 年 187 卷

页码：

收录情况： SCI

摘要： Effect of complexation of three medium-chain fatty acids (octanoic, decylic and lauric acid, OA, DA and LA, respectively) on structural characteristics, physicochemical properties and digestion behaviors of cassava starch (CS) was investigated. Current study indicated that LA was more easily to combine with CS (complex index 88.9%), followed by DA (80.9%), which was also consistent with their corresponding complexed lipids content. Following the investigation of morphology, short-range ordered structure, helical structure, crystalline/amorphous region and fractal dimension of the various complexes, all cassava starch-fatty acids complexes (CS-FAs) were characterized with a flaked morphology rather than a round morphology in native starch (control CS). Xray diffraction demonstrated that all CS-FAs had a V-type crystalline structure, and nuclear magnetic resonance spectroscopy confirmed that the complexes made from different fatty acids displayed similar V6 or V7 type polymorphs. Interestingly, small-angle X-ray scattering analysis revealed that alpha value became greater following increased carbon chain length of fatty acids, indicating the formation of a more ordered fractal structure in the aggregates. Changes in rheological parameters G ' and G '' indicated that starch complexed with fatty acids was more likely to form a gel network, but difference among three CS-FAs complexes was significant, which might be contributed to their corresponding hydrophobicity and hydrophilicity raised from individual fatty acids. Importantly, digestion indicated that CS-LA complexes had the lowest hydrolysis degree, followed by the greatest RS content, indicating the importance of chain length of fatty acids for manipulating the fine structure and functionality of the complexes.

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