Sensitive electrochemical detection of l-cysteine based on a highly stable Pd@Ti3C2T:X(MXene) nanocomposite modified glassy carbon electrode

P. Abdul Rasheed, Ravi P. Pandey, Khadeeja A. Jabbar, Janarthanan Ponraj, Khaled Mahmoud

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Abstract

Rapid and real-time detection of l-cysteine (l-Cys) is important for early diagnostics of several diseases and biological disorders. We report here a stable and highly sensitive electrochemical sensor for the detection of l-Cys based on a Pd@Ti3C2Tx (MXene)-modified glassy carbon electrode (GCE). The Pd@Ti3C2Tx nanocomposite was prepared by in situ reduction of Pd(ii) salt on the surface of delaminated (DL) Ti3C2Tx nanosheets to form pseudo-spherical palladium nanoparticles (PdNPs) with 2-6 nm size distributions. The MXene acts as the conductive matrix and a reducing agent at the electrode surface, while PdNPs are there to improve the stability of Ti3C2Tx and to enhance the electrocatalytic activity towards l-Cys detection. The Pd@Ti3C2Tx/GCE sensor exhibited a detection limit of 0.14 μM and a linear electro-oxidative response to l-Cys within the concentration range from 0.5 to 10 μM. The sensor also demonstrated excellent selectivity over common interfering ions such as ascorbic acid, uric acid, dopamine and glucose.

Original languageEnglish
Pages (from-to)3851-3856
Number of pages6
JournalAnalytical Methods
Volume11
Issue number30
DOIs
Publication statusPublished - 14 Aug 2019

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ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Engineering(all)

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