文献类型： 外文期刊
第一作者： Hao, Yacheng
作者： Hao, Yacheng;Chen, Yun;Li, Qian;Gao, Qunyu;Gao, Qunyu;Li, Qian
作者机构：
关键词： Waxy potato starch; Nanocrystals; Esterification; Hydrophobicity; Octenyl succinic anhydride
期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：5.645； 五年影响因子：5.749 ）
ISSN： 0926-6690
年卷期： 2019 年 130 卷
页码：
收录情况： SCI
摘要： Waxy potato starch nanocrystals (SNCs) were successfully modified through esterification by using octenyl succinic anhydride (OSA) aiming to improve its hydrophobicity. The SNCs were characterized by using H-1 nuclear magnetic resonance (H-1 NMR) spectroscopy, X-ray diffraction (XRD), Fourier transformation infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), dispersion experiments and scanning electron microscopy (SEM). The degree of substitution (DS) was determined by means of H-1 NMR revealed the upward trend with the increase of OSA dosage. XRD displayed the un-changed crystalline structure of SNCs but relative slight decrease of crystallinity. FT-IR spectroscopy showed characteristic absorption of the ester carbonyl groups and carboxylate RCOO- enclosed to 1732 cm(-1), 1572 cm(-1) respectively in OSA-SNCs. XPS confirmed the introduction of long chain hydrocarbon. The hydrophobicity of the modified SNCs increased with the increase of applied OSA contents. Dispersion experiments revealed the prominent compatibility and stability of nanocrystals in chloroform and acetone. SEM micrographs showed the serious aggregation of OSA-SNCs composed of smaller blocklets with 200-800 nm in size.
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