研究了氢氧化钠溶解法和二甲基亚砜溶解法对玉米淀粉结构的影响.采用非对称场流分离系统与多角度激光光散射检测器、示差折光检测器联用技术分离表征了玉米淀粉.同时,通过扫描电子显微镜、X线衍射、傅里叶变换红外光谱和差示扫描量热法对不同溶解方法得到的玉米淀粉凝胶的形貌和结构进行了表征.研究结果表明,氢氧化钠溶解法可以分解直链淀粉-脂质复合物,使非对称场流分离联用技术测得的玉米淀粉的粒径和摩尔质量分布更精确.
The effect of sodium hydroxide(NaOH)dissolution method and dimethyl sulfoxide(DMSO)dissolution method on the conformation of maize starch was investigated.The dissolved maize starch was separated and characterized by asymmetrical flow field-flow fractionation(AF4)coupled with multiangle light scattering(MALS)and differential refractive index(dRI)detectors.Meanwhile, the morphology and conformation of the maize starch gel was characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), attenuated total reflection Flourier transform infrared spectroscopy(ATR-FTIR)and differential scanning calorimetry(DSC).The results revealed that the amylose-lipid complex can be disassociated by NaOH dissolution method, which makes the data(i.e.size and molar mass distributions)from AF4-MALS-dRI more accurate.
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