Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 18, Pages 20720-20728Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02936
Keywords
surface plasmon resonance; immunosensor; CD5; gold-coated magnetic nanoparticles; signal enhancement
Funding
- European Social Fund [09.3.3-LMT-K-712-19-0170]
- Research Council of Lithuania (LMTLT)
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A surface plasmon resonance (SPR) immunosensor signal amplification strategy based on antibody-functionalized gold-coated magnetic nanoparticles (mAuNPs) was developed for ultrasensitive and quantitative detection of the CD5 biomarker. The sandwich immunoassay utilizing mAuNPs-anti-CD5(2B) significantly improved the detection sensitivity and showed satisfactory performance in human blood serum.
A surface plasmon resonance (SPR) immunosensor signal amplification strategy based on antibody-functionalized gold-coated magnetic nanoparticles (mAuNPs) was developed for ultrasensitive and quantitative detection of the CD5 biomarker using an indirect sandwich immunoassay format. The gold surface of the SPR sensor disk and mAuNPs was modified with a self-assembled monolayer of 11-mercaptoundecanoic acid (11-MUA), and the coupling method using N-(3-(dimethylamino)propyl)-N'-ethyl-carbodiimide hydrochloride and N-hydroxysuccinimide was used to immobilize capture antibodies against human CD5 (anti-CD5(2A)) and detection antibodies against human CD5 (anti-CD5(2B)), respectively. The mAuNPs and anti-CD5(2B) conjugates (mAuNPs-anti-CD5(2B)) were separated by an external magnetic field and used to amplify the SPR signal after the formation of the anti-CD5(2A)/CDS immune complex on the SPR sensor disk. Compared to the direct CD5 detection with a limit of detection (LOD) of 1.04 nM and a limit of quantification (LOQ) of 3.47 nM, the proposed sandwich immunoassay utilizing mAuNPs-anti-CD5(2B) significantly improved the LOD up to 8.31 fM and the LOQ up to 27.70 fM. In addition, it showed satisfactory performance in human blood serum (recovery of 1.04 pM CD5 was 109.62%). These results suggest that the proposed signal amplification strategy has superior properties and offers the potential to significantly increase the sensitivity of the analysis.
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