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

Rabiaa Helim; Ali Zazoua; Nicole Jaffrezic-Renault; Hafsa Korri-Youssoufi

doi:10.1016/j.talanta.2023.124784

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

Talanta. 2023 Dec 1:265:124784. doi: 10.1016/j.talanta.2023.124784. Epub 2023 Jun 10.

Authors

Rabiaa Helim¹, Ali Zazoua², Nicole Jaffrezic-Renault³, Hafsa Korri-Youssoufi⁴

Affiliations

¹ University of Jijel, Laboratory of Applied Energetics and Materials, Jijel, 18000, Ouled Aissa, Algeria; Université Paris-Saclay, CNRS, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), ECBB, 17 avenue des sciences, 91400, Orsay, France. Electronic address: rabiaa.helim@univ-jijel.dz.
² University of Jijel, Laboratory of Applied Energetics and Materials, Jijel, 18000, Ouled Aissa, Algeria; ENP of Constantine, Laboratoire de Génie des Procédés pour le Développement Durable et les Produits de Santé, Constantine, 25000, Algeria. Electronic address: a_zazoua@univ-jijel.dz.
³ University of Lyon, Institute of Analytical Sciences, 69100, Villeurbanne, France.
⁴ Université Paris-Saclay, CNRS, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), ECBB, 17 avenue des sciences, 91400, Orsay, France. Electronic address: hafsa.korri-youssoufi@universite-paris-saclay.fr.

PMID: 37356191
DOI: 10.1016/j.talanta.2023.124784

Abstract

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⁺, Ni^2+, 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.

Keywords: Heavy metals; Hemicellulose; Opuntia Ficus Indica; Polysaccharide; Sensors.