Gold nanoparticle-carboxymethyl cellulose nanocolloids for detection of human immunodeficiency virus type-1 (HIV-1) using laser light scattering immunoassay

Gold nanoparticle-carboxymethyl cellulose nanocolloids for detection of human immunodeficiency virus type-1 (HIV-1) using laser light scattering immunoassay

[Display omitted] •New “green” gold nanoparticles-carboxymethylcellulose bioconjugates were synthesized.•AuNP-CMC colloids of core-shell nanostructures were formed in situ in aqueous medium.•AuNPs-CMC colloids showed average core size of 10–20 nm with plasmonic peak at 520 nm.•A simple, rapid laser...

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Bibliographic Details
Published in:Colloids and surfaces, B, Biointerfaces Vol. 177; pp. 377 - 388
Main Authors: Caires, A.J., Mansur, H.S., Mansur, A.A.P., Carvalho, S.M., Lobato, Z.I.P., dos Reis, J.K.P.
Format: Journal Article
Language:English
Published: Netherlands Elsevier B.V 01-05-2019
Subjects:
Biointerfaces
Gold nanoparticles
Green nanotechnology
Hybrid nanostructures
Nanocolloids
Hybrid nanostructures
Green nanotechnology
Biointerfaces
Nanocolloids
Gold nanoparticles
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Summary:[Display omitted] •New “green” gold nanoparticles-carboxymethylcellulose bioconjugates were synthesized.•AuNP-CMC colloids of core-shell nanostructures were formed in situ in aqueous medium.•AuNPs-CMC colloids showed average core size of 10–20 nm with plasmonic peak at 520 nm.•A simple, rapid laser light-based immunoassay for detection of HIV-1 was developed.•AuNP-CMC conjugates presented 2.0 pM of lowest detection limit for DLS biosensing. It is estimated that over 100 million people have been infected with human immunodeficiency virus (HIV-1) resulting in approximately 30 million deaths globally. Herein, we designed and developed novel nano-immunoconjugates using gold nanoparticles (AuNPs) and carboxymethylcellulose (CMC) biopolymer, which performed simultaneously as an eco-friendly in situ reducing agent and surface stabilizing ligand for the aqueous colloidal process. These AuNPs-CMC nanocolloids were biofunctionalized with the gp41 glycoprotein receptor (AuNPs-CMC-gp41) or HIV monoclonal antibodies (AuNPs-CMC_PolyArg-abHIV) for detection using the laser light scattering immunoassay (LIA). These AuNPs-CMC bioengineered nanoconjugates were extensively characterized by morphological and physicochemical methods, which demonstrated the formation of spherical nanocrystalline colloidal AuNPs with the average size from 12 to 20 nm and surface plasmon resonance peak at 520 nm. Thus, stable nanocolloids were formed with core-shell nanostructures composed of AuNPs and biomacromolecules of CMC-gp41, which were cytocompatible based on in vitro cell viability results. The AuNPs-CMC-gp41 nanoconjugates were tested against HIV monoclonal antibodies conjugates (AuNPs-CMC_PolyArg-abHIV) using the light scattering immunoassay (LIA) where they behaved as active nanoprobes for the detection at nM level of HIV-1 antigenic proteins. This strategy offers a novel nanoplatform for creating bioprobes using green nanotechnology for the detection of HIV-1 and other virus-related diseases.
ISSN:0927-7765
1873-4367
DOI:10.1016/j.colsurfb.2019.02.025