在pH=1.89 的 Britton-Robinson(BR)缓冲溶液中,阿莫西林与氯金酸反应生成金纳米粒子,在537和720 nm产生了特征等离子体共振吸收信号,其537 nm处的吸收强度与阿莫西林浓度在一定范围内呈线性关系,据此建立了基于金纳米粒子的等离子体共振吸收测定阿莫西林的方法.在优化条件下(pH=1.89,反应温度65℃,反应时间40 min),测定阿莫西林的线性范围为2.0×10-6～3.6×10-5 mol/L,检出限为1.3×10-7 mol/L.该方法用于合成样品中阿莫西林的测定,回收率在90.4％ ～ 103.2％之间,RSD小于4.6％,将所建立的方法用于2个厂家生产的阿莫西林胶囊中阿莫西林含量测定,并与HPLC法对比,结果满意.
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