Effect of Plasmon Resonance of Silver Nanoparticles on the Fluorescent Properties of Doxycycline

Journal of Analytical Chemistry - Silver nanoparticles modified with Eu3+ ions increase the intensity of the fluorescence signal by a factor of 125 in an analytical system containing doxycycline as...     

Determination of flunixin by sensitized terbium fluorescence in the presence of surfactant micelles

The effect of surfactant micelles and the second ligand on the efficiency of energy transfer in the Tb³⁺–flunixin complex was studied. The fluorescence intensity of the Tb³⁺–flunixin complex was shown to 100-fold increase in the presence of Tween 80 micelles and the second trioctylphosphine oxide ligand. A procedure for the fluorimetric determination of flunixin in the Flunex drug product (NITA-FARM, Saratov, Russia) was developed. The linearity range of the calibration curve was from 1 × 10^–7 to 1 × 10^–4 M, r ² = 0.991, and the limit of detection was 4 × 10^–8 M (3σ).