红外光谱在研究改性淀粉结晶结构中的应用

 【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1300-800cm-1波数段的改性淀粉特征峰进行解卷积处理，得到980、1022和1047cm-1处的峰面积，计算980/1022、980/1047、(980+1047)/1022和980/(1022+1047) cm-1的峰面积比值，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】发现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，而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。

Infrared Spectroscopy Study on the Crystal Structure of Modified Starch

【Objective】The objective of this paper is to characterize the aggregation state structure of modified starch using the infrared spectrometry.【Method】For the 1300–800 cm-1 region, the FTIR spectra of modified starch were deconvoluted Voigt-type equations for all found peaks. The areas of deconvoluted peaks at approx. 1047, 1022 and 980 cm-1 were obtained and the surface ratio of 980/1022, 980/1047, (980+1047)/1022 and 980/(1022+1047) cm-1 were analyzed for the effect of modification on the starch crystalline structure. Then the result was compared with that of X-ray diffractometry.【Result】The results indicated that acetification induced a decrease of starch crystallinity and the crystal structure changed from A-type to V-type, but the cross-linking of POCl3 had little effect on the starch crystal structure.【Conclusion】The results suggest that the infrared spectrometry can characterize the chain structure of modified starch as well as the aggregation state structure for the agreement of the results of the X-ray diffractometry.