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Quantitative and ultrasensitive detection of multiplex cardiac biomarkers in lateral flow assay with core-shell SERS nanotags.
Biosensors & Bioelectronics 2018 May 31
Rapid and sensitive quantification of multiplex proteins in a wide concentration range is challenging in high throughput analysis. Herein, we proposed a lateral flow assay (LFA) based on core-shell surface enhanced Raman scattering (SERS) nanotags for multiplex and quantitative detection of cardiac biomarkers for the early diagnosis of acute myocardial infarction (AMI). In practice, Raman dyes (RDs) were embedded into the interior-gap of silver core and gold shell nanoparticles (NPs) to form SERS nanotags as labels instead of gold colloids and three test lines were employed in the strip for the detection of three cardiac biomarkers, Myo, cTnI, and CK-MB, respectively. Due to the amplified signal of the SERS nanotags and the high surface area to volume ratio (SVR) of porous nitrocellulose (NC) membrane, ultrasensitive quantification of protein markers with wide linear dynamic range (LDR) was realized, which is crucial for the quick detection of multiplex biomarkers in the same sample without pretreatments at bedsides. This method makes it possible for LFA in point of care testing (POCT) to be comparable with chemiluminescence immunoassay (CLIA) used in labs.
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