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Cysteine functionalized bio-nanomaterial for the affinity sensing of Pb(II) as an indicator of environmental damage

AuthorsRamírez, María L.; Tettamanti, Cecilia S.; Gutiérrez, Fabiana A.; González Domínguez, José Miguel; Ansón Casaos, Alejandro ; Hernández-Ferrer, Javier; Martínez Fernández de Landa, María Teresa; Rivas, Gustavo A.; Rodríguez, Marcela C.
KeywordsLead affinity biosensing
Environmental damage
Affinity electrochemical biosensor
Covalent functionalization
Cysteine functionalized bio-nanomaterial
Single walled carbon nanotubes (SWCNT)
Issue Date31-May-2018
CitationMicrochemical Journal 141: 271-278 (2018)
AbstractThis work aims at the development of an electrochemical affinity biosensor for Pb(II) quantification using a platform that combines glassy carbon electrodes (GCE) and an aqueous dispersion of single-walled carbon nanotubes (SWCNT) covalently modified with cysteine residues (Cys). The biosensing protocol includes the accumulation of Pb(II) at the electrode surface through the affinity interaction promoted by Cys residues at open circuit potential, followed by the reduction of the accumulated Pb(II) at ‐0.900 V and the transduction step performed by linear sweep-adsorptive stripping voltammetry (LSAdSV) in a 0.020 M acetate buffer solution pH 5.00. There is a linear relationship between Pb(II) oxidation peak current and Pb(II) concentration. The dynamic linear range extends from 5.0 to 125.0 μg·L−1, exhibiting a sensitivity of 0.061 μAμg−1L and a detection limit of 0.69 μg·L−1. In addition, the selectivity of the biosensor was evaluated in the presence of high concentrations of possible interferents such as Cu(II), Cd(II), Ni(II), Hg(II), Rh(II), Ru(II), Zn(II), Ir(IV), Co(II) and As(III) demonstrating a high discrimination of Pb(II) in complex samples. The sensor was challenged with tap and rain water samples enriched with Pb(II), demonstrating outstanding properties in terms of recovery percentages showing an excellent agreement with ICP- MS.
Identifiersdoi: 10.1016/j.microc.2018.05.007
issn: 0026-265X
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