Abstract
A new approach to direct quantitative detection of small molecules (haptens) by dynamic light scattering biosensing is presented. The proposed technique implements a homogeneous competitive immunoassay and is based on optical detection of specific inhibition of nanoparticle aggregation induced by the analyte in a sample. The technique performance was tested both in buffer and milk for detection of chloramphenicol – antibiotic relevant to food safety diagnostics. Good specificity, sensitivity (LOD in milk is 2.4 ng/ml), precision (4.0 ± 1.2%), ruggedness (8.3%), and 96% recovery in conjunction with a record wide dynamic range (3 orders of magnitude) of the nanosensing technique were demonstrated. Such characteristics complemented by the assay simplicity (no washing step) and a short assay time make the approach attractive for application as an analytical platform for point-of-care and field-oriented diagnostics.
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Funding
This multidisciplinary work was supported by the grant of Russian Science Foundation no. 16-19-00131 (development and characterization of the nanoparticles and their conjugates with bioreceptors) and Ministry of Science and Higher Education of Russian Federation in the framework of the implementation of agreement no. 14.624.21.0045 of September 26, 2017 (unique identifier RFMEFI62417X0045) (dynamic light scattering assay experiments).
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All-Russian Research Institute for Optical and Physical Measurements has filed a patent application RU2019140681 on the developed assay technology (L.A.D., R.A., A.M.K., D.E.B., N.M.P. are named as the inventors).
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Published in the topical collection Advances in Direct Optical Detection with guest editors Antje J. Baeumner, Günter Gauglitz, and Jiri Homola.
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Levin, A.D., Ringaci, A., Alenichev, M.K. et al. Dynamic light scattering biosensing based on analyte-induced inhibition of nanoparticle aggregation. Anal Bioanal Chem 412, 3423–3431 (2020). https://doi.org/10.1007/s00216-020-02605-9
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DOI: https://doi.org/10.1007/s00216-020-02605-9