β-cyclodextrin-functionalized silver nanoparticles for the naked eye detection of aromatic isomers.
We report herein the development of a highly robust, quantitative, sensitive, and naked eye colorimetric detection method for different isomers of aromatic compounds using β-CD-modified silver nanoparticle (AgNPs) probes. This assay relies on the distance-dependent optical properties of Ag nanoparticles and the different inclusion binding strength of the aromatic guests to β-CD host. In the presence of different isomers of aromatic compounds, AgNPs could be rapidly induced to aggregate, thereby resulting in apricot-to-red color change. The variety and concentration of different isomers of aromatic compounds could be determined by monitoring with the naked eye or a UV-vis spectrometer. The present detection limit for different isomers of aromatic compounds is 5 × 10(-5) M. We believe that the surface architectures of AgNPs after the introduction of the CD-based host-guest recognition would be applicable for a range of chemical and bioanalytical molecular sensing systems in aqueous media.
Chen
Xin
X
CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Key Laboratory of Optoelectronic Science and Technology in Anhui Province, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
Parker
Stephen G
SG
Zou
Gang
G
Su
Wei
W
Zhang
Qijin
Q
D003124:Colorimetry / Q000379:methods*; D007536:Isomerism; D053768:Metal Nanoparticles / Q000737:chemistry*; D019370:Observation / Q000379:methods; D009930:Organic Chemicals / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014785:Vision, Ocular / Q000502:physiology*; D047392:beta-Cyclodextrins / Q000737:chemistry*
D009930:Organic Chemicals; D047392:beta-Cyclodextrins; D012834:Silver