Electrochemical determination of thiabendazole pesticide extracted and preconcentrated from tomato samples by cloud point extraction

Abstract

TBZ was identified and detected in the analysis of commercial tomato samples obtained from local establishment.

Sensitive Electrochemical Detection of Thiabendazole in Fruits Using Ag−MoS2 Electrode

“…As seen in the table, the developed sensor showed comparable LOD with the most of the sensors even lower than that of a commercial BDD electrode mentioned in reference [18]. Our sensor owes a slightly higher LOD than that reported in reference [25]. However, this value is after a preconcentration step which was not used in our study.…”

“…No shift in peak potential (Ep) was observed for all scan cycles, which evidences weak adsorption of the oxidized TBZ on the Ag−MoS 2 /GCE surface. TBZ also showed similar electrochemical behavior on other electrodes such as GCE [24], MWCNT/MoS 2 /GCE [4], BDDE [18, 25], and ZnFe 2 O 4 /SWCNT/GCE [22]. Other TBZ families such as omeprazole on GCE [26], pantoprazole on GCE [27], rabeprazole on GCE [28], and carbendazim on boron‐doped diamond electrode [29] also showed similar irreversible electrochemical behavior.…”

Cloud point method applied to the extraction and preconcentration of thiabendazole pesticide from whole grape juice samples and amperometric detection by HPLC

“…18 Unlike conventional extraction techniques, CPE can be considered environmentally friendly since it is in accordance with the principles of "Green Chemistry". [19][20][21][22][23][24] In this procedure, diluted solutions of biodegradable non-ionic surfactants are used as an extracting medium, generating very little, low toxicity, non-volatile, and highly ammable laboratory waste. [19][20][21][22][23][24] Surfactant solutions have the ability to modify some properties in order to improve the sensitivity and/or selectivity of the analytical method.…”

“…[19][20][21][22][23][24] In this procedure, diluted solutions of biodegradable non-ionic surfactants are used as an extracting medium, generating very little, low toxicity, non-volatile, and highly ammable laboratory waste. [19][20][21][22][23][24] Surfactant solutions have the ability to modify some properties in order to improve the sensitivity and/or selectivity of the analytical method. The main characteristic of surfactants is the formation of supramolecular structures that have hydrophilic and hydrophobic structural regions, which associate dynamically and spontaneously in aqueous solution from a given micellar concentration, known as critical micellar concentration (CMC).…”

“…The use of HPLC coupled to electrochemical detection (HPLC/EC) can provide adequate separation of the analyte from the matrix and its interferents, as well as detection at low concentrations, depending on the electrode material used. 19,20,26 Boron-doped diamond (BDD) electrodes provide exceptional response to several aqueous and non-aqueous analytes with low capacitive current and are less sensitive to oxygen dissolved in solution, 19,20,24,[27][28][29][30][31] and in many cases do not require deoxygenation of the supporting electrolyte. 32 Another important characteristic is their ability to modify the surface with cathodic and anodic pretreatments, 33,34 which are normally dened according to the characteristics of the analytes under study.…”