Article (Scientific journals)
Nanobody-Based Immunosensor Detection Enhanced by Photocatalytic-Electrochemical Redox Cycling
Trashin, Stanislav; Morales Yánez, Francisco Javier; Thiruvottriyur Shanmugam,, Saranya et al.
2021In Analytical Chemistry
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Abstract :
[en] Detection of antigenic biomarkers present in trace amounts is of crucial importance for medical diagnosis. A parasitic disease, human toxocariasis, lacks an adequate diagnostic method despite its worldwide occurrence. The currently used serology tests may stay positive even years after a possibly unnoticed infection, whereas the direct detection of a re-infection or a still active infection remains a diagnostic challenge due to the low concentration of circulating parasitic antigens. We report a time-efficient sandwich immunosensor using small recombinant single-domain antibodies (nanobodies) derived from camelid heavy-chain antibodies specific to Toxocara canis antigens. An enhanced sensitivity to pg/mL levels is achieved by using a redox cycle consisting of a photocatalytic oxidation and electrochemical reduction steps. The photocatalytic oxidation is achieved by a photosensitizer generating singlet oxygen (1O2) that, in turn, readily reacts with p-nitrophenol enzymatically produced under alkaline conditions. The photooxidation produces benzoquinone that is electrochemically reduced to hydroquinone, generating an amperometric response. The light-driven process could be easily separated from the background, thus making amperometric detection more reliable. The proposed method for detection of the toxocariasis antigen marker shows superior performances compared to other detection schemes with the same nanobodies and outperforms by at least two orders of magnitude the assays based on regular antibodies, thus suggesting new opportunities for electrochemical immunoassays of challenging low levels of antigens.
Disciplines :
Biotechnology
Author, co-author :
Trashin, Stanislav;  Universiteit Antwerpen - UA > Department of Chemistry > A-Sense Lab
Morales Yánez, Francisco Javier ;  Vrije Universiteit Brussel - VUB > Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
Thiruvottriyur Shanmugam,, Saranya;  Vrije Universiteit Brussel - VUB > Department of Chemistry > A-Sense Lab
Paredis, Linda;  Institute of Tropical Medicine Antwerp > Department of Biomedical Sciences > Unit of Medical Helminthology
Carrion, Erik N;  Seton Hall University > Department of Chemistry and Biochemistry and the Center for Functional Materials
Sariego, Idalia;  Institute of Tropical Medicine Pedro Kouri > Department of Parasitology
Muyldermans, Serge;  Vrije Universiteit Brussel - VUB > Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
Polman, Katja;  Institute of Tropical Medicine Antwerp > Department of Biomedical Sciences > Unit of Medical Helminthology
Gorun, Sergiu M;  Seton Hall University > Department of Chemistry and Biochemistry and the Center for Functional Materials
De Wael, Karolien;  Universiteit Antwerpen - UA > Department of Chemistry > A-Sense Lab
Language :
English
Title :
Nanobody-Based Immunosensor Detection Enhanced by Photocatalytic-Electrochemical Redox Cycling
Publication date :
2021
Journal title :
Analytical Chemistry
ISSN :
0003-2700
eISSN :
1520-6882
Publisher :
American Chemical Society, United States - District of Columbia
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 January 2022

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