建立了以铁氰化钾测定头孢噻肟钠的分光光度法.在 0.20 mol/L NaOH 溶液中,头孢噻肟钠(CTX)于 100℃水浴中降解生成的巯基化合物能将 Fe(Ⅲ)(pH=3.0)还原为Fe(Ⅱ),根据Fe(Ⅱ)与K3[Fe(CN)6]反应生成可溶性普鲁士蓝(KFeⅢ[FeⅡ(CN)6])的吸光度,可以间接测定头孢噻肟钠的含量.头孢噻肟钠在0.040～24 mg/L 范围内与吸光度(A)呈线性关系,线性回归方程:A=0.05088+0.2166ρ(mg/L),相关系数R=0.9986,检出限为0.01 mg/L,相对标准偏差(RSD)为1.36%(n=11),表观摩尔吸光系数ε=2.3 ×105 L/(mol·cm).此方法可用于药物及血清中头孢噻肟钠含量的测定.
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