Solid-phase luminescence determination of tetracycline in bottled water using chemically modified silica

Abstract

Abstract⎯Possibility of using chemically modified silica (CMS) with covalently immobilized sulfonic and ethylenediaminetriacetate (ED3A) groups for the adsorption preconcentration and extraction of tetracycline (TC) from aqueous solutions is studied. The conditions of complex formation by europium(III) ions on the surface of these adsorbents are optimized. The effect of citrate and Eu 3+ ions on the luminescence intensity of the Eu-TC complex is shown. The luminescence properties of SiO 2 ED3AEu and SiO 2 SO 3 HEu systems with tetracyclines are studied depending on the acidity of the medium, time of phase contact, the ratio of the volume of the solution to the weighed portion of the adsorbent, and concentrations of the adsorbed substances. It is found that tetracycline is quantitatively extracted by CMS as a complex with europium(III) ions in pH range 6.5-8.0; adsorption capacity to tetracycline in the Henry region is as high as 0.07-0.09 mmol/g and partition coefficients are 10 3 -10 4 mL/g. A procedure is developed for the solid-phase luminescence determination of tetracycline using SiO 2 SO 3 HEu and SiO 2 ED3AEu systems with limits of detection of 0.8 and 2.0 nM, respectively; linearity range is 1 × 10 -9 -1 × 10 -5 M. The procedure is tested in the analysis of model mixtures and samples of bottled water.

Green synthetic nitrogen-doped graphene quantum dot fluorescent probe for the highly sensitive and selective detection of tetracycline in food samples

“… 1 However, the excessive consumption of human food containing TC or improper handling of residues can be harmful to human health. 2,3 Therefore, we urgently need a method to quickly detect TC in different samples. Currently, scientists have developed several conventional methods for detecting TC residues.…”

A Molecularly Imprinted Polymer Capped Nitrogen‐Doped Graphene Quantum Dots System for Sensitive Determination of Tetracycline in Animal‐Derived Food

“…Tetracycline (TC), which is a class of broad‐spectrum antibiotics, has been extensively used as a feed additive in farming to promote livestock growth and prevent bacterial infections . However, excessive applications of TC may result in harmful residues in foods that people eat (for example meat, milk and honey), or end up in water and soil . These residues could spread the risk of drug‐resistant bacteria, and subsequently endanger human health in serious ways .…”