Journal
FOOD CHEMISTRY
Volume 403, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2022.134376
Keywords
Electrochemiluminescence; Binuclear coordination polymer; Lanthanide; Transition metal; Tetracycline
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To address the growing concerns about food safety, a sensor for tetracycline antibiotics was urgently needed. In this study, a series of binuclear coordination polymers (Tb-Zn-CPs) were synthesized and one particular polymer exhibited high electrochemiluminescence (ECL) intensity. A sensor utilizing this polymer was developed for sensitive detection of tetracycline, achieving good results in dairy product analysis.
To meet the growing concerns about food safety, sensors for tetracycline antibiotics have been urgently needed. Herein, we synthesized a series of binuclear coordination polymers (Tb-Zn-CPs) based on lanthanide and transition metal ions by solvothermal method using [1,1':4',1 ''-terphenyl]-3,3 '',5,5 ''-tetracarboxylic acid, Tb(NO3)(3) and Zn(NO3)(2). The morphologies and electrochemiluminescence (ECL) performances of Tb-Zn-CPs varied with different molar ratios of terbium and zinc ions (Tb:Zn). The flower-like Tb-Zn-CP (9:3) possessed the highest ECL intensity due to the ligand antenna effect and the sensitization of Zn2+. An ECL sensor for the detection of tetracycline (TC) was constructed utilizing Tb-Zn-CP (9:3) as a novel ECL luminophore and potassium persulfate as a coreactant. The proposed sensor achieved sensitive detection of TC in the range of 5.0 fmol.L-1 to 3.0 mmol.L-1 with a low limit of detection (1.6 fmol.L-1). It also was applied for TC detection in dairy products with good recovery rates.
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