This paper reports the determination of ulifloxacin (UFX) by terbium-sensitized fluorescence using a second-order scattering method. UFX and Tb(III) ion form a fluorescence complex in aqueous solution, and its maximum excitation and emission wavelengths are located at 273 and 545 nm, respectively. In optimum conditions, the relative intensity at 545 nm has a linear relationship to the concentra...

A new sensitive, simple and rapid method for determination of methotrexate (MTX) was developed based on quenching effects of MTX on the fluorescence intensity of Tb3+-1,10-phenanthroline complex. The fluorescence intensity was measured with excitation wavelength of 300 nm and emission wavelength of 545 nm and the quenched fluorescence intensity is proportional to the concentration of MTX in Tris...

A new terbium(III) complex with a (3,4-diphenyl)(2-methylthienyl)cyclopentadienyl ligand was synthesized. Single-crystal X-ray analysis revealed binuclear biscyclopentadienyl [TbCl2K]2 core. Luminescence properties of the terbium were analyzed.

A benzimidazole ligand with a tripodal structure, N, N′, N′′-tris (2-benzimidazolmethyl) amine, and its terbium (III) complex has been synthesized. The complex has been characterized by element analysis, IR spectra, mass spectra, thermal analysis and molar conductivity. The terbium ion is found to coordinate with the nitrogen atoms(=N-)of imidazole ring and the bridgehead nitrogen atom. The flu...

We have demonstrated the first observable case of efficient energy transfer from poly-ligands to terbium ions through cross-linked siloxane in solution. The intensification of green luminescence was easily perceived by the naked eye under UV-254 nm illumination, where even the terbium dopants reached 0.1 μM. Moreover, the nano-scale fibrous structure (diameter 100-200 nm) aggregated to a micro-...

We extend the technique of fluorescence resonance energy transfer (FRET) by introducing a luminescent terbium chelate as a donor and an organic dye, tetramethylrhodamine, as an acceptor. The results are consistent with a Förster theory of energy transfer, provided the appropriate parameters are used. The use of lanthanide donors, in general, and this pair, in particular, has many advantages ove...

A luminescence method was developed to screen residues of enrofloxacin (ENRO) and its metabolite, ciprofloxacin (CIPRO), in swine liver. Target analytes were extracted in acetonitrile/1.5% trifluoroacetic acid/NaCl, cleaned up by dispersive liquid-liquid microextraction (DLLME), and finally detected by terbium-sensitized luminescence (TSL) using a time-resolved luminescence photometer. CIPRO yi...

Lanthanide ions have been successfully used as luminescent probes in several biological systems. The terbium (Tb) luminescence is greatly enhanced in Tb(III)-protein systems by non-radiative energy transfer from aromatic chromophores to bound Tb ions. In this study, the luminescent properties of terbium have been used to monitor the metal-peptide interactions of angiotensin II, a linear octopep...

Terbium, a fluorescent probe, which fluoresces primarily with guanine and xanthine bases, has been used to investigate the interaction of platinum complexes with DNA and RNA. c/sDichlorodiammineplatinum(ll), a potent antitumor agent, pro duced a marked enhancement in fluorescence intensity when reacted with double-stranded DNA. This can be explained by the c/s-dichlorodiammineplatinum(ll) produ...