Singh Narpinder, Belton Peter S, Georget Dominique M R
Department of Food Science and Technology, Guru Nanak Dev University, Amritsar 143005, India.
Int J Biol Macromol. 2009 Aug 1;45(2):116-9. doi: 10.1016/j.ijbiomac.2009.04.006. Epub 2009 May 3.
In the present study the effect of iodine on the structural characteristics (by infrared spectroscopy and X-ray) of films made from kidney bean starch was evaluated. The pasting properties as affected by iodine and glycerol were also evaluated. Kidney bean starch showed C-type (mixture of A- and B-type) crystalline structure, the conversion of starch into films resulted into reduction in intensity of diffractograms. The starch powder FTIR spectra had peaks centered at 1020 and 995 cm(-1) with a higher intensity at 1020 cm(-1), which is consistent with a partially crystalline material since fully crystalline material show similar intensity peaks centered around 1020 and 1006 cm(-1). Films without iodine showed one main peak centered around 1000 cm(-1) consistent with a disordered state similar to that in gelatinized starch. Iodine addition gradually increased the intensity of the bands around 1020 cm(-1) consistent with the formation of more ordered conformation similar to that in the crystalline material. Iodine encourages the formation of helical structures, however, the formation of crystalline material cannot be inferred. The increasing amounts of iodine up to 0.33% level progressively increased the peak-, through- and breakdown-viscosity. Iodine beyond 0.33% level gradually decreased peak-, trough-, breakdown- and setback-viscosity. Pasting temperature gradually increased with the increase in iodine.
在本研究中，评估了碘对由菜豆淀粉制成的薄膜结构特征（通过红外光谱和X射线）的影响。还评估了碘和甘油对糊化特性的影响。菜豆淀粉呈现C型（A-型和B-型的混合物）晶体结构，淀粉转化为薄膜导致衍射图强度降低。淀粉粉末的傅里叶变换红外光谱（FTIR）在1020和995 cm⁻¹处有峰值，其中1020 cm⁻¹处的强度更高，这与部分结晶材料一致，因为完全结晶材料在1020和1006 cm⁻¹左右显示出相似强度的峰值。不含碘的薄膜在1000 cm⁻¹左右有一个主峰，这与类似于糊化淀粉的无序状态一致。添加碘逐渐增加了1020 cm⁻¹左右谱带的强度，这与形成更有序的构象一致，类似于结晶材料中的构象。碘促进螺旋结构的形成，然而，不能推断出结晶材料的形成。碘含量增加至0.33%时，峰值黏度、谷值黏度和破损黏度逐渐增加。碘含量超过0.33%时，峰值黏度、谷值黏度、破损黏度和回生黏度逐渐降低。糊化温度随着碘含量的增加而逐渐升高。
