Hybrid silica-polyelectrolyte films as optical sensing materials for tetracycline antibiotics

作者：Motorina A; Tananaiko O; Kozytska I; Raks V; Badia R; Diaz Garcia M E; Zaitsev V N^*

来源：Sensors and Actuators B: Chemical , 2014, 200: 198-205.

DOI：10.1016/j.snb.2014.04.023

• Silica
• Sol-gel
• Films
• Optical sensors
• Fluorescence

Optical sensor element for the determination of tetracycline (Tc) based on europium-sensitized luminescence of the SiO2-polyelectrolyte (PE)-Eu(III) hybrid film was worked out. The morphology of the hybrid films and their adsorption capacity towards Tc were function of PE and non-ionic surfactants content in silica coating solution. The presence of a mixture of Tween 20 and triblock copolymer Pluronic F-127 in a molar ratio Tween 20:Pluronic F-127 = 35:2.5 in silica sol resulted in the formation of films with uniform and ordered mesoporous structure. The use of polyvinyl- and polystyrene sulfonic acids during sol-gel synthesis greatly increased Tc adsorption within the hybrid films. SiO2-PE-Eu(III) films were used for Tc determination in milk with a linear response range in 0.6-10 mu mol L-1 and LOD 0.3 mu mol L-1 of Tc. The sensitivity and selectivity of determination increased in the presence of citrate ions in solution.

• 出版日期2014-9