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Uhuo O, Waryo T, Oranzie M, Sanga N, Leve Z, January J, Tshobeni Z, Pokpas K, Douman S, Iwuoha E. Interferon gamma (IFN-γ)-sensitive TB aptasensor based on novel chitosan-indium nano-kesterite (χtCITS)-labeled DNA aptamer hairpin technology. Bioelectrochemistry 2024; 158:108693. [PMID: 38554559 DOI: 10.1016/j.bioelechem.2024.108693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Revised: 03/15/2024] [Accepted: 03/16/2024] [Indexed: 04/01/2024]
Abstract
There has been increasing interest in the use of biosensors for diagnosis of infectious diseases such as tuberculosis (TB) due to their simplicity, affordability, and potential for point-of-care application. The incorporation of aptamer molecules and nanomaterials in biosensor fabrication explores the advantages of high-binding affinity and low immunogenicity of aptamers as well as the high surface-to-volume ratio of nanomaterials, for increased aptasensor performance. In this work, we employed a novel microwave-synthesized copper indium tin sulfide (CITS) substituted-kesterite nanomaterial, together with a natural biopolymer (chitosan), for signal amplification and increased loading of aptamer molecules. Study of the optical properties of CITS nanomaterials showed strong absorption in the UV region characteristic of kesterite semiconductor nanomaterials. X-ray diffraction analysis confirmed the presence of the kesterite phase with average crystallite size of 6.188 nm. Fabrication of interferon-gamma (IFN-γ) TB aptasensor with a chitosan-CITS nanocomposite (χtCITS) increased the aptasensor's electrochemical properties by 77.5 % and improved aptamer loading by 73.7 %. The aptasensor showed excellent sensitivity to IFN-γ concentrations with limit of detection of 6885 fg/mL (405 fM) and linear range of 850-17000 fg/mL (50 - 1000 fM). The aptasensor also exhibited excellent storage and electrochemical stability, with good selectivity towards IFN-γ and possible real sample application.
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Affiliation(s)
- Onyinyechi Uhuo
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa.
| | - Tesfaye Waryo
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - Marlon Oranzie
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - Nelia Sanga
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - Zandile Leve
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - Jaymi January
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - Ziyanda Tshobeni
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - Keagan Pokpas
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - Samantha Douman
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa; Department of Chemistry, PD Hahn Building, 28 Chemistry Road, Upper Campus, University of Cape Town, Private Bag X3, Rondebosch 7701, Cape Town, South Africa
| | - Emmanuel Iwuoha
- SensorLab (University of the Western Cape Sensor Laboratories), Chemical Sciences Building, University of the Western Cape, Bellville 7535, Cape Town, South Africa.
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Memela M, Feleni U, Mdluli S, Ramoroka ME, Ekwere P, Douman S, Iwuoha E. Electro‐photovoltaics of Polymer‐stabilized Copper–Indium Selenide Quantum Dot. ELECTROANAL 2020. [DOI: 10.1002/elan.202060392] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Muziwenkosi Memela
- SensorLab University of the Western Cape Sensor Laboratories Robert Sobukwe Road Bellville 7535 Cape Town South Africa
| | - Usisipho Feleni
- Institute for Nanotechnology and Water Sustainability (iNanoWS), College of Science, Engineering and Technology University of South Africa P/Bag X6 Florida Campus 1710, Roodepoort Johannesburg South Africa
| | - Siyabonga Mdluli
- SensorLab University of the Western Cape Sensor Laboratories Robert Sobukwe Road Bellville 7535 Cape Town South Africa
| | - Morongwa E. Ramoroka
- SensorLab University of the Western Cape Sensor Laboratories Robert Sobukwe Road Bellville 7535 Cape Town South Africa
| | - Precious Ekwere
- SensorLab University of the Western Cape Sensor Laboratories Robert Sobukwe Road Bellville 7535 Cape Town South Africa
| | - Samantha Douman
- SensorLab University of the Western Cape Sensor Laboratories Robert Sobukwe Road Bellville 7535 Cape Town South Africa
| | - Emmanuel Iwuoha
- SensorLab University of the Western Cape Sensor Laboratories Robert Sobukwe Road Bellville 7535 Cape Town South Africa
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Ndangili PM, Masikini M, Feleni U, Douman S, Tovide O, Williams A, Baker P, Iwuoha EI. Gallium-Induced Perturbation of Zinc Selenide Quantum Dots Electronics. ChemistrySelect 2017. [DOI: 10.1002/slct.201700748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Peter M. Ndangili
- SensorLab, Department of Chemistry; University of Western Cape; Private Bag X17 Bellville 7535 South Africa
- Department of Chemical Science and Technology; Technical University of Kenya; P.O Box 52428 - 00200 Nairobi Kenya
| | - Milua Masikini
- SensorLab, Department of Chemistry; University of Western Cape; Private Bag X17 Bellville 7535 South Africa
| | - Usisipho Feleni
- SensorLab, Department of Chemistry; University of Western Cape; Private Bag X17 Bellville 7535 South Africa
| | - Samantha Douman
- SensorLab, Department of Chemistry; University of Western Cape; Private Bag X17 Bellville 7535 South Africa
| | - Oluwakemi Tovide
- SensorLab, Department of Chemistry; University of Western Cape; Private Bag X17 Bellville 7535 South Africa
| | - Avril Williams
- Department of Biological and Chemical Sciences; University of the West Indies; Cave Hill Campus, P.O. Box 64 Bridgetown BB11000 Barbados
| | - Priscilla Baker
- SensorLab, Department of Chemistry; University of Western Cape; Private Bag X17 Bellville 7535 South Africa
| | - Emmanuel I. Iwuoha
- SensorLab, Department of Chemistry; University of Western Cape; Private Bag X17 Bellville 7535 South Africa
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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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