A wash-free, dip-type fiber optic plasmonic (DiP) assay for sub-zeptomole analyte detection

Bandaru Ramakrishna; Vani Janakiraman; V V R Sai

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arXiv · 1810.06437

A wash-free, dip-type fiber optic plasmonic (DiP) assay for sub-zeptomole analyte detection

Bandaru Ramakrishna·Vani Janakiraman·V V R Sai

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Abstract

This study demonstrates a rapid, wash-free dip-type fiber optic plasmonic sandwich (DiP) assay capable of zeptomole analyte detection and 6-orders of wide dynamic range. The DiP assay is realized on a compact U-bent fiber optic probe surface by dipping the antibody functionalized probe into a mixture of sample solution and AuNP labeled reagent. U-bent fiberoptic probes with a high evanescent wave absorbance sensitivity allow detection of the high extinction gold nanoparticle (AuNP) labels in terms of a drop in the light intensity, which is measured with the help of a pair of LED and photodetector (PD). This simple and low-cost DiP assay gave rise to unprecedented detection limit down to 0.17 zeptomole of human immunoglobulin G (HIgG) in 0.025 ml buffer solution within an assay time of 25 min. Further, silver enhancement of AuNP labels over 5 min resulted in a limit of quantitation (LoQ) down to 0.17 zeptomole (~100 molecules in 0.025 ml). The DiP assay with high sensitivity and low detection limits within an assay time of 30 min demonstrated here could facilitate low cost point-of-care diagnostics as well as high-throughput systems.

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Bandaru Ramakrishna, Vani Janakiraman, V V R Sai. 2018-09-02. A wash-free, dip-type fiber optic plasmonic (DiP) assay for sub-zeptomole analyte detection. https://arxiv.org/abs/1810.06437

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