交联辛烯基琥珀酸淀粉酯半干法合成工艺与改性机理研究

以环氧氯丙烷(ECH)和辛烯基琥珀酸酐(OSA)为改性剂，采用半干法工艺合成具有疏水亲脂性质的交联辛烯基琥珀酸淀粉酯(COSAS)。通过单因素及正交试验研究COSAS的合成工艺与反应机理，测定产品白度，并用红外光谱仪和扫描电镜对产品结构进行分析。结果表明：半干法合成COSAS的最佳工艺参数为淀粉含水量15%～18%、OSA用量3%(占淀粉干基分数)、酯化时间90min、pH9.0、温度100℃，在此工艺下制备的COSAS平均取代度为0.0175，白度值比原淀粉的稍低；红外光谱图证实了淀粉经交联酯化变性后引入了醚化交联键和辛烯基琥珀酸基团。扫描电镜显示淀粉颗粒表面受到侵蚀，部分颗粒出现凹陷、空隙和裂缝。

Semi-dry Synthesis and Modification Mechanisms of Crosslinked Octenyl Succinic Anhydride-modified Cassava Starch

Cassava starch was modified with epichlorohydrin(ECH) and octenyl succinic anhydride(OSA) by a semi-dry process to synthesize hydrophobic lipophilic crosslinked octenyl succinic anhydride-modified starch(COSAS).The synthesis process was optimized by one-factor-at-a-time and orthogonal array design methods.The reaction mechanisms were elucidated.The whiteness of COSAS was determined and structural analysis was carried out using Fourier transform infrared spectrometry and scanning electron microscope(SEM).The...