Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 44, Pages 37829-37834Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b13180
Keywords
multivalent antibody; antibody-nanoparticle conjugate; surface-enhanced Raman scattering; immunoassay; biosensor
Funding
- Center for BioNano Health -Guard - Ministry of Science and ICT (MSIT) of Korea as Global Frontier Project [H-GUARD_2013-M3A6B2078950, H-GUARD_2014M3A6B2060507]
- Bio & Medical Technology Development Program of the National Research Foundation (NRF) - MSIT of Korea [NRF-2018M3A9E2022821]
- First-Mover Program for Accelerating Disruptive Technology Development through the NRF - MSIT of Korea [NRF-2018M3C1B9069834]
- Technology Program for establishing biocide safety management from the Korea Environmental Industry & Technology Institute - Korea Ministry of Environment [RE 201804085]
- KRIBB initiative Research Program
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Multivalent immunoprobes can improve the sensitivity of biosensors because increased valency can strengthen the binding affinity between the receptor and target biomolecules. Here, we report surface-enhanced Raman scattering (SERS)-based immunoassays using multivalent antibody-conjugated nanoparticles (NPs) for the first time. Multivalent antibodies were generated through the ligation of Fab fragments fused with Fc-binding peptides to immunoglobulin G. This fabrication method is easy and fast because of the elimination of heterologous protein expression, high degrees of antibody modifications, and covalent chemical ligation steps. We constructed multivalent antibody-NP conjugates (MANCs) and employed them as SERS immunoprobes. MANCs improved the sensitivity of SERS-based immunoassays by 100 times compared to standard antibody-NP conjugates. MANCs will increase the feasibility of practical SERS-based immunoassays.
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