摘要:
为研究不同碱对木薯淀粉结构的影响,利用第IA主族碱金属氢氧化物配制的碱/醇溶液对木薯淀粉进行处理。通过偏振光显微镜、激光共聚焦显微镜、扫描电子显微镜、X-射线衍射分析、傅里叶变换红外光谱仪对处理木薯淀粉进行表征,并对其直链淀粉和总还原糖含量进行检测。结果表明,不同碱/醇溶液处理均不影响木薯淀粉颗粒形貌的完整性。红外结果显示没有产生新的官能团,但处理木薯淀粉在3412 cm-1处的峰向高波数方向移动,且其强度均小于原木薯淀粉。此外,随着碱金属元素所在周期的增大,碱/醇溶液处理对木薯淀粉内部结构的破坏明显增强,木薯淀粉的晶型发生变化,其相对结晶度由原来的22.03%降至15.07%,淀粉颗粒中直链淀粉含量由22.30%逐渐降低至16.51%。所有处理样品中的总还原糖含量均高于原木薯淀粉。综上可知,不同碱/醇溶液处理对木薯淀粉结构的影响表现出明显的差异。
Abstract:
In order to study the effect of different alkali on the structure of cassava starch,the cassava starch was treated with alkali/alcohol solutions prepared from IA main group alkali metal hydroxide. The treated cassava starches were characterized by polarized light microscopy,laser confocal microscopy,scanning electron microscopy,X-ray diffraction analysis,fourier transform infrared spectroscopy. The amylose contents and reducing sugar contents of the samples were detected. The results showed that,the integrity of cassava starches particle morphology was not impacted as treated with different alkali/alcohol solutions. The result of fourier transform infrared spectroscopy showed that no new functional group formed,but the peak at 3412 cm-1 of treated cassava starches shifted to the high wavenumber and its intensity was lower than the native cassava starch. Moreover,as the period of the corresponding element of the alkali metal increased,the destruction of the internal structure of starch was obviously enhanced. The crystal form of cassava starches were changed and its relative crystallinity decreased from 22.03% to 15.07%. The amylose contents of the cassava starches was gradually decreased from 22.30% to 16.51%.The total reducing sugar contents of all treated samples was higher than the native cassava starch. In summary,the effect of different alkali/alcohol solution treatments on the structure of cassava starch showed significant differences.
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