Label free electrochemical sensors for Pb(II) detection based on hemicellulose extracted from Opuntia Ficus Indica cactus - HAL-SDE - Sciences de l'environnement Accéder directement au contenu
Article Dans Une Revue Talanta Année : 2023

Label free electrochemical sensors for Pb(II) detection based on hemicellulose extracted from Opuntia Ficus Indica cactus

Capteurs électrochimiques sans marquage pour la détection du Pb(II) à base d'hémicellulose extraite du cactus Opuntia Ficus Indica

Résumé

We aim to develop an electrochemical sensor for a divalent metal ion (lead II), a highly toxic water contaminant. We explore a sensor formed with a hemicellulose polysaccharide extracted from the Opuntia Ficus Indica cactus associated with agarose as a sensitive layer deposited on a gold electrode. This sensor combines the functional groups of hemicellulose that could form a complex with metal ions and agarose with gelling properties to form a stable membrane. The sensor demonstrated a loading ability of Pb2+, with higher affinity compared to other metal ions such as Hg2+, Ni2+, and Cu2+, thanks to the chemical structure of hemicellulose. The detection was measured by square wave voltammetry based on a well-defined redox peak of the metal ions. The sensor shows high sensitivity towards Pb2+ with a detection limit of 1.3 fM. The application in river and sea water using the standard addition method for lead detection was studied.
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Dates et versions

hal-04299636 , version 1 (01-12-2023)

Identifiants

Citer

Rabiaa Helim, Ali Zazoua, Nicole Jaffrezic-Renault, Hafsa Korri-Youssoufi. Label free electrochemical sensors for Pb(II) detection based on hemicellulose extracted from Opuntia Ficus Indica cactus. Talanta, 2023, 265, pp.124784. ⟨10.1016/j.talanta.2023.124784⟩. ⟨hal-04299636⟩
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