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用表面张力法及紫外光谱研究了β CD与非离子型表面活性剂TritonN - 10 1(TN)的包结体系。结果表明 ,TN的表面张力值及表观临界胶束浓度 (CMC )随 β CD浓度增加而增大 ,由于实验数据与所构建的 1∶1包结的数学模型完全相符 ,由此推测 β CD与TN形成 1∶1包结物。运用这一数学模型计算了TN与 β CD体系的包结平衡常数Ka(2 98K) ,结果表明Ka值与 β CD浓度成正比。通过Ka值还计算了包结体系自由能变化。紫外光谱结果表明 ,在 β CD浓度较小时 ,TN的疏水链优先进入 β CD内腔 ,而 β CD浓度较大时 ,TN的苯环部分也进入 β CD内腔
The inclusion system of β CD and nonionic surfactant TritonN - 10 1 (TN) was investigated by surface tension and UV spectroscopy. The results show that the surface tension of TN and the apparent critical micelle concentration (CMC) increase with the increase of β CD concentration. Since the experimental data are completely consistent with the mathematical model of 1: 1 inclusion, it is inferred that β CD Form a 1: 1 inclusion with TN. Using this mathematical model, the entrapment equilibrium constant Ka (2 98 K) between TN and β CD systems was calculated. The results show that the Ka value is proportional to β CD concentration. By Ka value also calculated the inclusion system free energy changes. The results of UV spectroscopy showed that the hydrophobic chain of TN preferentially enters the β CD lumen when the concentration of β CD is small, and the benzene ring of TN also enters the β CD lumen when the β CD concentration is large