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

TL;DR

This paper presents a rapid, wash-free fiber optic plasmonic assay capable of detecting analytes at zeptomole levels with a wide dynamic range, suitable for low-cost point-of-care diagnostics.

Contribution

The study introduces a novel dip-type fiber optic plasmonic assay with unprecedented sensitivity and detection limits down to 0.17 zeptomole, enabling rapid and low-cost analyte detection.

Findings

Detection limit of 0.17 zeptomole for human IgG

Assay time of 25 minutes

Wide dynamic range over 6 orders of magnitude

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.