铽离子增敏荧光光度法测定鱼肉组织中的恩诺沙星残留

为了研究建立分析测定恩诺沙星的新方法,以铽-恩诺沙星配合物的荧光特性为基础,发现在pH值为6.0的HAc-NaAc缓冲溶液中,铽与恩诺沙星的配合物在545 nm(λ_(ex)=328 nm)处产生了Tb^(3+)的特征荧光峰,可用于恩诺沙星的分析测定,从而建立了简单、快速、灵敏测定恩诺沙星的荧光方法,并优选了反应的最佳条件。在最佳试验条件下,恩诺沙星浓度在1.0×10^(-8)~1.0×10^(-6)g/m L范围内与其545 nm的荧光强度呈良好的线性关系(r^2=0.992 3),检出限为1.3×10^(-9)g/m L;对药片中恩诺沙星的测定回收率为97.7%,变异系数为1.4%;对于鱼肉组织中恩诺沙星测定回收率为79.0%~94.5%,变异系数为2.0%~7.8%。

Determination of Residual Enrofloxacin in Fish Tissues by Terbium Ion-sensitized Fluorophotometry

In order to establish a new method for the determination of enrofloxacin, on the basis of the fluorescence characteristic of terbium-enrofloxacin complex, it was found that in a HAc-NaAc buffer solution with a pH value at 6.0, the terbiumenrofloxacin complex had a characteristic fluorescence peak of Tb3＋ at 545 nm （λex= 328 nm）, which could be used for the determination of enrofloxacin. A simple, rapid and sensitive fluorescence method for the determination of enrofloxacin was thus established, and an optimal reaction condition was selected. Under the optimal reaction condition, there was a good linear relation （r2=0.992 3） between concentration of enrofloxacin in the range of 1.0×10^-1.0×10^-6 g/ml and its fluorescence intensity at 545 nm, with a detection limit of 1.3×10^-9 g/ml; the recovery for enrofloxacin in tablets was 97.7% with a variation coefficient of 1.4%; and for enrofloxacin in fish tissues, the recovery was 79.0%-94.5% with a variation coefficient of 2.0%-7.8%.