Interactions between Caffeine, Theophylline and Derivatives with Gold Nanoparticles and Implications for Aptamer-Based Label-Free Colorimetric Detection.
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DOI: 10.1002/cplu.202200265
Abstract: Caffeine, theophylline, and other methylxanthines have interesting biological activities and are consumed in high quantities globally, causing health and environmental concerns. Gold nanoparticles (AuNPs) have excellent optical properties for biosensor development, although little is known… read more here.
Keywords: label free; adsorption; gold nanoparticles; caffeine theophylline ... See more keywords
Dissecting the Effect of Salt for more Sensitive Label-free Colorimetric Detection of DNA Using Gold Nanoparticles.
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DOI: 10.1021/acs.analchem.0c02688
Abstract: Taking advantage of the protection effect of single-stranded DNA oligonucleotides, gold nanoparticles (AuNPs) remain dispersed and retain a red color with the addition of a low concentration of salt, while AuNPs would aggregate in the… read more here.
Keywords: free colorimetric; gold nanoparticles; salt; dna ... See more keywords
Disulfide-induced self-assembled targets: A novel strategy for the label free colorimetric detection of DNAs/RNAs via unmodified gold nanoparticles
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DOI: 10.1038/srep45837
Abstract: A modified non-cross-linking gold-nanoparticles (Au-NPs) aggregation strategy has been developed for the label free colorimetric detection of DNAs/RNAs based on self-assembling target species in the presence of thiolated probes. Two complementary thiol- modified probes, each… read more here.
Keywords: free colorimetric; detection; gold nanoparticles; self assembled ... See more keywords
Wash-free colorimetric homogeneous immunoassay for Zygosaccharomyces rouxii
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DOI: 10.1039/c7ra02791e
Abstract: Convenient, rapid and reliable detection of food spoilage microorganisms has always been critical to food safety. Commonly used methods such as an enzyme-linked immunosorbent assay (ELISA) often rely on tedious wash steps and incubation procedures.… read more here.
Keywords: free colorimetric; zygosaccharomyces rouxii; colorimetric homogeneous; wash free ... See more keywords
Self color-changing ordered mesoporous ceria for reagent-free colorimetric biosensing.
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DOI: 10.1039/c9nr09182c
Abstract: A reagent-free colorimetric detection method using mesoporous cerium oxide with a large pore size trapping an oxidative enzyme has been developed and glucose is sensitively detected with a limit of detection of 10 μM by… read more here.
Keywords: self color; free colorimetric; color changing; changing ordered ... See more keywords
An amplification-free colorimetric test for sensitive DNA detection based on the capturing of gold nanoparticle clusters.
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DOI: 10.1039/d0nr03517c
Abstract: PCR-free or amplification-free strategies for DNA detection provide an interesting alternative to classical molecular biology techniques, opening new possibilities for on-site diagnostics. In this framework, we present herein an amplification-free colorimetric test for DNA detection,… read more here.
Keywords: colorimetric test; free colorimetric; detection; amplification free ... See more keywords