以蜡质玉米淀粉为原料,通过先羟丙基后辛烯基的改性顺序制备复合改性淀粉。采用傅里叶变换红外谱仪、扫描电镜、X射线衍射仪和Brabender黏度仪等对羟丙基辛烯基复合改性蜡质玉米淀粉的物化性质进行了测定和分析。结果表明:复合改性淀粉在1 550~1 610 cm-1处、1 714 cm-1处出现新的吸收峰,说明改性后引入了RCOO—和C=O基团。蜡质玉米淀粉复合改性后颗粒表面受损严重,颗粒的形状也发生明显改变,但晶体类型没有发生改变;透明性、冻融稳定性、乳化性和乳化稳定性明显提高。

The waxy corn starch was used to prepare hydroxypropyl and octenyl succinic anhydride compound modified starch.The physical properties of waxy corn hydroxypropyl and octenyl succinic anhydride compound modified starch were investigated by Fourier transform infrared spectrometer(FT-IR),scanning electron microscope,X-ray diffraction(XRD),Brabender viscometer and so on.The results indicated that the FT-IR spectrum of compound modified cassava starch showed new absorption peaks at 1 550 ~ 1 610 cm-1,1 714 cm-1,demonstrating the introduction of RCOO—and C=O groups.The surface of the starch granule exhibited rougher and more irregular shape,but the crystalline structure was not changed.The transparency,freeze-thaw stability,emulsifying and emulsion stability after compound modification.