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Masikini M, Williams AR, Sunday CE, Waryo TT, Nxusani E, Wilson L, Qakala S, Bilibana M, Douman S, Jonnas A, Baker PGL, Iwuoha EI. Label Free Poly(2,5-dimethoxyaniline)-Multi-Walled Carbon Nanotubes Impedimetric Immunosensor for Fumonisin B₁ Detection. Materials (Basel) 2016; 9:ma9040273. [PMID: 28773401 PMCID: PMC5502966 DOI: 10.3390/ma9040273] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 03/12/2016] [Accepted: 03/24/2016] [Indexed: 11/26/2022]
Abstract
An impedimetric immunosensor for fumonisin B1 (FB1) was developed from a poly(2,5-dimethoxyaniline)-multi-walled carbon nanotube (PDMA-MWCNT) composite on the surface of glassy carbon electrode (GCE). The composite was prepared electrochemically and characterized using cyclic voltammetry. The preparation of the FB1 immunosensor involved the drop-coating of a bovine serum albumin mixture of the anti-fumonisin antibody (anti-Fms) onto the composite polymer-modified GCE. The electrochemical impedance spectroscopy (EIS) responses of the FB1 immunosensor (GCE/PDMA-MWCNT/anti-Fms) have a linear range of 7 to 49 ng·L−1, and the corresponding sensitivity and detection limits are 0.272 kΩ L·ng−1 and 3.8 pg·L−1, respectively. The limit of detection of the immunosensor for certified corn sample (i.e., certified reference material) is 0.014 ppm FB1, which is in excellent agreement with the value published by the vendors and significantly more accurate than that obtained with enzyme-linked immunosorbent assay (ELISA).
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Affiliation(s)
- Milua Masikini
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Avril R Williams
- Department of Biological and Chemical Sciences, The University of the West Indies, Cave Hill Campus, Bridgetown BB11000, Barbados.
| | - Christopher E Sunday
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Tesfaye T Waryo
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Ezo Nxusani
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Lindsay Wilson
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Sinazo Qakala
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Mawethu Bilibana
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Samantha Douman
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Anovuyo Jonnas
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Priscilla G L Baker
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
| | - Emmanuel I Iwuoha
- SensorLab, Department of Chemistry, University of the Western Cape Robert Sobukwe Road, Bellville 7535, Cape Town, South Africa.
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