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中文摘要：
[目的]考察红外光谱分析在研究淀粉及改性淀粉结晶结构中应用的效果,为淀粉结晶结构研究提供一种有效的表征方法.[方法]通过对红外光谱图1 300～800 cm-1波数段的改性淀粉特征峰进行解卷积处理,得到980、1 022和1 047 cm-1处的峰面积,计算980/1 022、980/1 047、(980+1 047)/1 022和980/(1 022+1 047) cm-1的相对峰面积比值,研究改性对淀粉结晶结构的影响,并与X-射线衍射分析相比较.[结果]随着醋酸酯化取代度的增大,980/1 022、980/1 047、(980+1 047)/1 022和980/(1 022+1 047)的相对峰面积的比值均呈现下降趋势,表明醋酸酯化改性会导致淀粉结晶程度降低,结晶形态从A型转变为V型;随着交联度的增大,980/1 022、980/1 047、(980+1 047)/1 022和980/(1 022+1 047)的相对峰面积比值均呈现下降趋势,但下降程度较小,表明三氯氧磷交联对淀粉结晶结构影响不明显.[结论]利用红外光谱研究改性淀粉结晶结构所得的结果与X-射线衍射分析结果相符,说明红外光谱可同时用于表征淀粉改性过程中链结构和聚集态结构的变化.
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