Application of Calcium-Binding Motif of E-Cadherin for Electrochemical Detection of Pb(II)

Hamid R. Lotfi Zadeh Zhad, Rebecca Y. Lai

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We report, for the first time, the use of a 13-amino-acid peptide sequence derived from the calcium-binding site of E-cadherin in the fabrication of an electrochemical peptide-based (E-PB) Pb(II) sensor. The sensing mechanism is analogous to that of previously developed E-PB sensors. Binding of Pb(II) rigidifies the surface-immobilized and methylene blue (MB)-modified peptide probe, thereby limiting the accessibility of the tethered MB to the electrode surface. This change in probe flexibility results in a reduction in the MB current that is dependent on the target concentration. The sensor behaves as a "signal-off" sensor in alternating current voltammetry and cyclic voltammetry, but it can behave as a "signal-on" sensor in differential pulse voltammetry when a longer pulse width is employed. It is capable of specific detection of Pb(II) and is selective enough to be employed in realistically complex samples such as diluted tap water, saliva, and urine samples. The detection is fast; signal saturation can be achieved in <60 s. The sensor can also be fabricated on gold-plated screen-printed carbon electrodes, electrode substrates that are ideal for cost-effective analysis of Pb(II) in real-world settings.

Original languageEnglish (US)
Pages (from-to)6519-6525
Number of pages7
JournalAnalytical Chemistry
Volume90
Issue number11
DOIs
StatePublished - Jun 5 2018

ASJC Scopus subject areas

  • Analytical Chemistry

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