Retraction Note to: A SERS-based lateral flow assay for the stroke biomarker S100-β.

Abstract

A surface-enhanced Raman scattering (SERS)-based lateral flow assay (LFA) is described for the quantitative analysis of the proteinic stroke biomarker S100-β that has to be detected at very low concentration levels. The Raman reporter 5,5′-dithiobis-2-nitrobenzoic acid (DTNB) on gold nanoparticles (GNPs) was employed as the SERS tags. They are shown to perform much better than bare GNPs in LF strips. The S100-β protein can be detected by this method with very low detection limits by monitoring the intensity of the characteristic Raman peak of the S100-β protein-conjugated GNPs at 1332 cm−1. Under optimized conditions, the assay works in the 1 pg·mL−1 to 40 ng·mL−1 S100-β concentration range, and the detection limit is as low as 0.14 pg·mL−1. This is lower by a factor of 3 compared to colorimetric or fluorimetric methods.