Selective and sensitive electrochemical sensors based on an ion imprinting polymer and graphene oxide for the detection of ultra-trace Cd(ii) in biological samples

Abstract

New selective and sensitive electrochemical sensors were designed based on the deposition of a promising ion imprinted polymer (IIP) on the surface of glassy carbon electrode (GCE) for the detection and monitoring of Cd(ii) in different real samples.

Selective separation of uranyl ions from some lanthanide elements using a promising β-enaminoester ligand by cloud point extraction

“…The synthesis of the enaminoester 1 was previously reported by our group starting with 2,7-dihydroxynaphthalene via a highly yielded protocol. 23 Starting with enaminoester 1, the promising diazinylenaminoester ligand 2 has been synthesized through the insertion of the diazinyl chromophore at the C-5 position of the enaminoester 1 via its coupling with 4-methoxybenzenediazonium chloride in an equimolar ratio (Scheme 1). 37,38 The coupling process acquired the enaminoester ligand a bright red color which could easily be detected with the spectrophotometer in the cloud point extraction method.…”

“…20 The presence of oxygen and nitrogen electron-rich sites promotes the affinity toward diverse electrophiles. 21–23 Cyclic primary β-enaminones can be represented in two geometric forms Z , s- Z and Z , s- E , based on the solvent nature and the steric properties, as depicted in Fig. S1 (ESI†).…”

Highly selective electrochemical sensing based on electropolymerized ion imprinted polyaniline (IIPANI) on a bismuth modified carbon paste electrode (CPE-Bi) for monitoring Nickel(ii) in river water

“…Thus, the inuence of competing ions is minimized. [24][25][26][27][28][29][30][31] The synthesis mechanism of IIP can be classied into four groups: (1) crosslinking of linear chain polymers carrying metalbinding groups; (2) chemical immobilization; (3) surface imprinting; and (4) trapping. Surface imprinting creates binding sites on the surface or near the imprinted polymers.…”

“…Surface imprinting creates binding sites on the surface or near the imprinted polymers. 24,25,27,[32][33][34][35] It is, therefore, possible to improve the current response and selectively bind the target ions. In this work, we are interested in developing a surface imprinting by electropolymerization, giving ion imprinted polymer for Ni(II) ions.…”

Electrochemical detection of Cd(ii) ions in complex matrices with nanopipets

“…Abdallah and colleagues recently developed another GCE-based electrode by depositing ion-imprinted polymer. 10 Using anodic stripping voltammetry, the authors detected Cd( ii ) in biological samples. However, conventional electrochemical techniques such as cyclic voltammetry, anodic stripping voltammetry, and linear sweep voltammetry require the target analyte to easily undergo the oxidation–reduction process.…”