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Antibody immobiliza...
Antibody immobilization strategy for the development of a capacitive immunosensor detecting zearalenone
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- Foubert, Astrid (author)
- Ghent University
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- Beloglazova, Natalia V. (author)
- Ghent University
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- Hedström, Martin (author)
- Lund University,Lunds universitet,Bioteknik,Centrum för tillämpade biovetenskaper,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Biotechnology,Center for Applied Life Sciences,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,CapSenze HB
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- De Saeger, Sarah (author)
- Ghent University
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(creator_code:org_t)
- Elsevier BV, 2019
- 2019
- English 7 s.
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In: Talanta. - : Elsevier BV. - 0039-9140. ; 191, s. 202-208
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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Abstract
Subject headings
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- A highly sensitive flow-injection capacitive immunosensor was developed for detection of the mycotoxin zearalenone (ZEN). Different strategies for immobilization of an anti-ZEN antibody on the surface of a gold electrode, i.e. polytyramine or self-assembled monolayers (SAMs) of 3-mercaptopropionic acid (3-MPA) and lipoic acid (LA), were used and their performances were compared. The LA- and 3-MPA-based systems showed broad linear ranges for ZEN determination, i.e. from 0.010 nM to 10 nM and from 0.020 nM to 10 nM, respectively. Under optimal conditions, the LA-based immunosensor was capable of performing up till 13 regeneration-interaction cycles (with use of glycine HCl, pH 2.4) with a limit of detection (LOD) of 0.0060 nM, equivalent to 1.9 pg mL−1. It also demonstrated a good inter-assay precision (RSD < 10%). However, the tyramine-based capacitive immunosensor showed a bad repeatability (only 4 regeneration-interaction cycles were possible) and inter-assay precision (RSD > 15%) which did not allow sensitive and precise measurements. The LA-based method was compared with a direct ELISA. These results demonstrated that the label-free developed capacitive immunosensor had a better sensitivity and shorter analysis time in comparison with the direct microwell-plate format.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Läkemedelskemi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Medicinal Chemistry (hsv//eng)
Keyword
- Capacitive immunosensor
- Mycotoxin
- Polytyramine
- Self-assembled monolayers
- Zearalenone
Publication and Content Type
- art (subject category)
- ref (subject category)
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