Wu Aihua, Shen Xinghai, He Yongke
Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China.
J Colloid Interface Sci. 2006 May 15;297(2):525-33. doi: 10.1016/j.jcis.2005.11.014. Epub 2005 Dec 13.
Dynamic light scattering (DLS) measurement provides an effective way to investigate the formation of nanotube of gamma-cyclodextrin (gamma-CD) induced by N,N'-diphenylbenzidine (DPB) in water. With the combination of steady-state fluorescence and fluorescence anisotropy experiments, it was found that for alpha- and beta-CD, only 1:2 (guest:host) inclusion complexes were formed and for gamma-CD, cyclodextrin nanotube was formed involving 16 gamma-CD units at maximum. The pH effect studies with both DLS and fluorescence anisotropy measurements indicated that the hydrogen bonding between neighboring CDs was necessary to the formation of cyclodextrin nanotube. In the temperature experiment, we found that the nanotube of DPB-gamma-CD could exist stably at relatively high temperatures and the transition point for structural collapse was estimated to be around 54 degrees C. The aggregation states of both gamma-CD itself and DPB-gamma-CD nanotube were observed with TEM.
动态光散射（DLS）测量提供了一种有效的方法来研究在水中由N，N'-二苯基联苯胺（DPB）诱导形成的γ-环糊精（γ-CD）纳米管。结合稳态荧光和荧光各向异性实验发现，对于α-和β-环糊精，仅形成了1:2（客体：主体）包合物，而对于γ-环糊精，最多涉及16个γ-环糊精单元形成了环糊精纳米管。通过DLS和荧光各向异性测量进行的pH效应研究表明，相邻环糊精之间的氢键对于环糊精纳米管的形成是必要的。在温度实验中，我们发现DPB-γ-环糊精纳米管可以在相对较高的温度下稳定存在，并且结构坍塌的转变点估计约为54℃。用透射电子显微镜（TEM）观察了γ-环糊精本身和DPB-γ-环糊精纳米管的聚集状态。
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