Chemiluminescent and Colorimetric Aptamer-Based Assays of Human α-Thrombin
A microplate-based sandwich assay for the determination of α-human thrombin (HTb) was developed. Fluorescein-modified 29-mer thrombin binding aptamer (FAM-TBA29) and biotinylated 15-mer thrombin binding aptamer (Bio-TBA15) reacting with different exosites of HTb were used as the biorecognition compo...
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Published in | Analytical letters Vol. 53; no. 1; pp. 140 - 151 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Taylor & Francis
02.01.2020
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Online Access | Get full text |
ISSN | 0003-2719 1532-236X |
DOI | 10.1080/00032719.2019.1640718 |
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Abstract | A microplate-based sandwich assay for the determination of α-human thrombin (HTb) was developed. Fluorescein-modified 29-mer thrombin binding aptamer (FAM-TBA29) and biotinylated 15-mer thrombin binding aptamer (Bio-TBA15) reacting with different exosites of HTb were used as the biorecognition components in the assay. FAM-TBA29 (capture aptamer) was immobilized using its interaction with anti-fluorescein antibody adsorbed on the microplate surface. As a sensitive signaling system, a combination of Bio-TBA15 and streptavidin-polyHRP conjugate was used. Under the optimized conditions, the detection limit for HTb was 1.4 nM; this value was the same in both the colorimetric and the chemiluminescent assays. The replacement of colorimetry for HRP measurement with chemiluminescence increased the assay sensitivity from 0.06 to 1.7 × 10
6
nM
−1
that clearly demonstrated advantage of the latter approach. |
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AbstractList | A microplate-based sandwich assay for the determination of α-human thrombin (HTb) was developed. Fluorescein-modified 29-mer thrombin binding aptamer (FAM-TBA29) and biotinylated 15-mer thrombin binding aptamer (Bio-TBA15) reacting with different exosites of HTb were used as the biorecognition components in the assay. FAM-TBA29 (capture aptamer) was immobilized using its interaction with anti-fluorescein antibody adsorbed on the microplate surface. As a sensitive signaling system, a combination of Bio-TBA15 and streptavidin-polyHRP conjugate was used. Under the optimized conditions, the detection limit for HTb was 1.4 nM; this value was the same in both the colorimetric and the chemiluminescent assays. The replacement of colorimetry for HRP measurement with chemiluminescence increased the assay sensitivity from 0.06 to 1.7 × 10
6
nM
−1
that clearly demonstrated advantage of the latter approach. |
Author | Sakharov, Ivan Yu Kurseev, Sergei A. Medvedko, Alexey V. Neumann, Marina M. Solovjev, Anton M. |
Author_xml | – sequence: 1 givenname: Sergei A. surname: Kurseev fullname: Kurseev, Sergei A. organization: Faculty of Chemistry, Lomonosov Moscow State University – sequence: 2 givenname: Anton M. surname: Solovjev fullname: Solovjev, Anton M. organization: Faculty of Chemistry, Lomonosov Moscow State University – sequence: 3 givenname: Marina M. surname: Neumann fullname: Neumann, Marina M. organization: Faculty of Chemistry, Lomonosov Moscow State University – sequence: 4 givenname: Alexey V. surname: Medvedko fullname: Medvedko, Alexey V. organization: Faculty of Chemistry, Lomonosov Moscow State University – sequence: 5 givenname: Ivan Yu surname: Sakharov fullname: Sakharov, Ivan Yu email: sakharovivan@gmail.com organization: Faculty of Chemistry, Lomonosov Moscow State University |
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Title | Chemiluminescent and Colorimetric Aptamer-Based Assays of Human α-Thrombin |
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