Silver nanoparticles enhanced fluorescence for sensitive determination of fluoroquinolones in water solutions

A new type of silver nanoparticle (AgNPs) was prepared with simple and fast methods and low-toxic compounds. With the addition of different concentrations of AgNPs, the effects of AgNPs on the fluorescence properties of three different kinds of fluoroquinolones (enrofloxacin ENR, lomefloxacin LMF and norfioxacin NOR) in water solutions were studied, respectively. The experimental results demonstrated that the fluorescence intensity for each of the fluoroquinolones (FQ)was firstly enhanced and then quenched with the increased concentration of AgNPs in water solutions. The possible mechanisms about the AgNPs on the fluorescence behaviors of each FQ were also investigated, respectively. In addition, new silver enhanced nanoparticles materials fluorescence methods were established for the separate determination of ENR, LMF and NOR in water solutions. As compared with the identical control fluorimetric methods with no addition of AgNPs, the new enhanced fluorimetic methods were also investigated, respectively. The experimental results indicated that the new enhanced methods could detect lower concentrations of ENR, LMF and NOR in water solutions. Moreover, the newly enhanced fluorimetric methods were validated and successfully applied for the quantitative assay of ENR, LMF and NOR in different kinds of medicinal preparations, respectively.