Journal
BIOSENSORS-BASEL
Volume 11, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/bios11070229
Keywords
immunochromatography; point-of-care testing; limit of detection; antigen test; coronavirus; receptor-binding domain; silver enhancement; gold enhancement; galvanic replacement; spike protein
Funding
- Ministry of Science and Higher Education of Russia [075-15-2019-1671]
Ask authors/readers for more resources
Three techniques were compared to lower the LOD of SARS-CoV-2 LFIA, with gold enhancement being the most optimal, increasing the maximum dilution of samples by 500 times and providing highly sensitive and rapid testing.
Three techniques were compared for lowering the limit of detection (LOD) of the lateral flow immunoassay (LFIA) of the receptor-binding domain of severe acute respiratory syndrome-related coronavirus 2 (SARS-CoV-2) based on the post-assay in situ enlargement of Au nanoparticles (Au NPs) on a test strip. Silver enhancement (growth of a silver layer over Au NPs-Au@Ag NPs) and gold enhancement (growth of a gold layer over Au NPs) techniques and the novel technique of galvanic replacement of Ag by Au in Au@Ag NPs causing the formation of Au@Ag-Au NPs were performed. All the enhancements were performed on-site after completion of the conventional LFIA and maintained equipment-free assay. The assays demonstrated lowering of LODs in the following rows: 488 pg/mL (conventional LFIA with Au NPs), 61 pg/mL (silver enhancement), 8 pg/mL (galvanic replacement), and 1 pg/mL (gold enhancement). Using gold enhancement as the optimal technique, the maximal dilution of inactivated SARS-CoV-2-containing samples increased 500 times. The developed LFIA provided highly sensitive and rapid (8 min) point-of-need testing.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available