淀粉及碘嵌入淀粉结构的原子力显微镜观测  

AFM Probing on the Microstructure of the Starch and the Starch-Iodine Complex

作　　者：彭敏[1] 阮湘元[1] 范洪波[1] 陈钻珍[1] 

机构地区：[1]东莞理工学院化学生物工程系,广东东莞523808

出　　处：《高分子材料科学与工程》2009年第4期102-104,108,共4页Polymer Materials Science & Engineering

基　　金：广东省重点攻关资助项目(2003A3060302);广东省教育厅基金资助项目(z02084);广东省东莞科技计划资助项目(ZC080126)

摘　　要：采用原子力显微镜(AFM)对淀粉及碘嵌入淀粉的微观结构进行了观察与研究,结果发现,糊化淀粉分子间以水做媒介通过分子氢键的相互作用形成大分子量复合物,当浓度为0.16012 g/L时,淀粉分子间卷曲成螺旋型构象的表面较光滑单层超大分子。淀粉分子形成的超大分子在原子力显微镜下没有明显的空隙,小分子量的碘在分子间力的作用下能吸附在淀粉分子的表面,进而进一步嵌入到超大淀粉分子之中,螺距发生了非常明显的变化,由300 nm左右变成700nm左右,表面变得粗糙,形成了网状拓扑结构,网格的最大高度为5 nm。据估算每个螺距范围内有5×107个碘的复合分子嵌入淀粉分子中。The morphological structure of starch and starch-iodine was investigated by using atomic force microscopy（AFM） techniques. The results show that the starch interlinks into one-layer helical superamolecular at the content of 0.16012 g/L and appears smoothly. It is certified that the adjacent starch may also be paired under direction of superamolecular recognition and attraction through hydrogen bonding interactions into molecular zipper. Iodine can be absorbed on the surface of supramolecular when added, further be embedded in it. And the morphological structure changed on the surface--the smooth surface became netlike （the grid height was 5 nm）, and the pitch changed to 700 nm. It is estimated that there are 5 × 10^7 of iodine molecules at each pitch.

关 键 词：原子力显微镜 淀粉 碘 微观结构 

分 类 号：O636.12[理学—高分子化学]