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Electrochemical sensing of histamine using a glassy carbon electrode modified with multiwalled carbon nanotubes
Nutthaya Butwong1, Jariya Khajonklin2, Atitaya Thongbor2
1Applied Chemistry Department, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, 744, Suranarai Rd, Nakhon Ratchasima, 30000, Thailand. nbutwong@yahoo.com.
Abstract:
A glassy carbon electrode (GCE) was modified with a nanocomposite consisting of multiwalled carbon nanotubes (MWCNTs) loaded with silver-argentous oxide nanoparticles (Ag-Ag2O). The electrode is shown as a viable tool for sensing histamine using differential pulse voltammetry (DPV). The modified GCE, best operated at a potential of 0.97 V (vs. Ag/AgCl) shows higher electrocatalytic activity compared to GCEs modified with MWCNTs or Ag-Ag2O only. Under the optimum conditions, the detection limit is 2 μg⋅L-1 (0.18 μM) and the response is linear in the 5 mg⋅L-1 to 200 mg⋅L-1 histamine concentration range. Sodium chloride, putrescine and cadaverine, commonly present in biological samples and foods, do not interfere. Other performance features include good recoveries, fabrication reproducibility and operational/storage stability. The modified GCE was applied for determination of histamine in fish sauce samples. Graphical abstract A glassy carbon modified with a thin Ag-Ag2O layer decorated on MWCNTs exhibits an enhanced surface area, increasing catalyst interface, and reduced overpotential towards histamine.
