Electrochemiluminescent detection of glyphosate using electrodes modified with self-assembled monolayer

GABRIELA MARZARI; MARIA VICTORIA CAPPELLARI; GUSTAVO MARCELO MORALES ; FERNANDO FUNGO

Analytical Methods

Royal Society of Chemistry

Año: 2017 vol. 9 p. 2452 - 2457

1759-9660

The use of glyphosate (GlyP) in agriculture causes environmental and health concerns to the modern society. Even today, its quantification remains as an analytical challenge. Therefore, it is required the development of analytical methods that allows to increase the sample throughput and cost-savings. This paper presents a study of the electrochemiluminescence (ECL) behaviour of the GlyP/Ru(bpy)32+ system on gold electrodes modified with self-assembled monolayers (SAM). The ECL response was analysed on three different electrode surfaces, bare gold and alkyl-thiol monolayers with ionizable (-COOH) and non-ionizable (-CH3) terminal group. It was found that the ECL signal of the GlyP/Ru(bpy)32+ system is improved by the modification of the electrodes reaching a limit of quantification (LOQ) of 6.42 µM when the SAM contains carboxylic end-group. In addition, the effect of the electrodes modification on the ECL behaviour is discussed. The results obtained and the calculated analytical parameters shown the potential of the proposed method to determine GlyP.