利用β-环糊精(β-CD)与阿莫西林在0.2 mol/L NaOH底液中形成包结物而使β-CD在二次微分简易示波伏安图上峰高降低的示波特性,建立了胶囊中阿莫西林的二次微分简易示波伏安测定新方法并测定了β-CD与阿莫西林的包络比和包结常数. 测定阿莫西林的线性范围为2.5×10-6～3.0×10-5 mol/L,回归方程为h(ν)=4.07-1.47×104c(mol/L),r=-0.997 9,检出限为1.0×10-6 mol/L. 对1.5×10-5 mol/L阿莫西林进行5次测定的相对标准偏差(RSD)为2.3%,回收率为100.1%. 另外,测得β-CD与阿莫西林形成包结物的包结比为1∶ 1、包结常数为6.0×105.
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