Enhanced Luminescence of Lanthanide Complexes by Silver Nanoparticles for Ciprofloxacin Determination
We present the enhancement of luminescence of europium complex, Eu3+-ciprofloxacin (CIP), in the presence of silver nanoparticles (Ag NPs) for the CIP determination. The increment of the luminescence intensity of the Eu3+-CIP complex with Ag NPs was obtained due to the transfer of resonance energy to the fluorophores through the interaction of the excited-state fluorophores and surface plasmon electron in the metal nano surface. The luminescence intensity of Eu3+ was enhanced by complexation with CIP at 614 nm after excitation at 373 nm corresponding to the 5D0-7F2 transitions of Eu3+ ion. Based on the above phenomenon, a sensitive and rapid spectrofluorimetric method has been developed for the CIP determination. Linearity of the calibration curve was obtained in the range of 2.0×10−10−1.0×10−8 g mL-1 with correlation coefficient of 0.9992. The limit of detection of CIP was found to be 1.9×10−11 g mL−1 with the relative standard deviation (RSD) of 1.19% for 5 replicate measurements of 5.0×10−7 g mL−1 of CIP. The present method has been successfully applied for CIP determination in pharmaceutical and biological samples.
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Document Type: Research Article
Publication date: 2012-07-01
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