Abstract
Vertical flow assays have been developed in recent years addressing limitations of the lateral flow assays, including limited multiplexing capability, quantitation, and hook effect. In the present study, the first passive paper-based vertical flow assay is developed for the detection of the nucleic acid target. Horseradish peroxidase was used as an enzymatic tracer with a high potential for signal amplification. In order to achieve the best signal-to-noise ratio, different parameters of paper-based assays were optimized. The sample is heat denatured and hybridized with a specific probe to form a dual-labeled hybridization complex. A small volume of diluted sample, 12 µl, can be analyzed within 6 min on the assay in a sandwich format. Assay specificity was evaluated by testing different unrelated samples, and also, 1.7 nM was obtained as the limit of detection (LOD) using the 0 + 3SD method, which is equivalent to 8.5 fmol of double-stranded DNA in the 12 µl sample volume. The linear range of 3–194 nM with a 0.978 correlation coefficient was obtained according to the calibration curve. The developed assay was evaluated with 45 hepatitis B virus clinical plasma samples, and the result showed 100% consistency of the assay with the real-time PCR benchmark. In the present study, we sought to develop a mere detection system for nucleic acid targets, and to investigate the possibility of using enzyme reporter in a passive vertical flow assay.
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Funding
This work has been conducted under the financial support of the Iran National Science Foundation (INSF) [grant number: 97009535] and Tarbiat Modares University.
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The collection of the samples was approved by the ethics committee of Tarbiat Modares University [Ethic code: IR.TMU.REC.1396.668].
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The authors declare no competing interests.
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Forty-five clinical plasma samples including 30 hepatitis B–infected patients and 15 healthy volunteers (previously confirmed by the real-time PCR, Qiagen Diagnostics, Hamburg, Germany) were obtained from different clinics around the country.
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Tahmasebi, M., Bamdad, T., Svendsen, W.E. et al. An enzymatic nucleic acid vertical flow assay. Anal Bioanal Chem 414, 3605–3615 (2022). https://doi.org/10.1007/s00216-022-03988-7
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DOI: https://doi.org/10.1007/s00216-022-03988-7