Probing the sensitive and selective luminescent detection of peroxynitrite using thiol-capped CdTe and CdTe@ ZnS quantum dots
Abstract CdTe and CdTe@ ZnS quantum dots (QDs) capped with 3-mercaptopropionic acid
(MPA), thioglycolic acid (TGA), or glutathione (GSH) have been employed for the first time as
luminescent probes for the sensitive and selective detection of peroxynitrite (ONOO−) in
aqueous solution. The sensitivity of the proposed probe followed the order: MPA–TGA–
CdTe@ ZnS> GSH–TGA–CdTe@ ZnS> MPA–CdTe QDs. The varying degree of quenching
is elucidated based on the QD–thiolate bond of CdTe@ ZnS being more sensitive to …
(MPA), thioglycolic acid (TGA), or glutathione (GSH) have been employed for the first time as
luminescent probes for the sensitive and selective detection of peroxynitrite (ONOO−) in
aqueous solution. The sensitivity of the proposed probe followed the order: MPA–TGA–
CdTe@ ZnS> GSH–TGA–CdTe@ ZnS> MPA–CdTe QDs. The varying degree of quenching
is elucidated based on the QD–thiolate bond of CdTe@ ZnS being more sensitive to …
Abstract
CdTe and CdTe@ZnS quantum dots (QDs) capped with 3-mercaptopropionic acid (MPA), thioglycolic acid (TGA), or glutathione (GSH) have been employed for the first time as luminescent probes for the sensitive and selective detection of peroxynitrite (ONOO−) in aqueous solution. The sensitivity of the proposed probe followed the order: MPA–TGA–CdTe@ZnS>GSH–TGA–CdTe@ZnS>MPA–CdTe QDs. The varying degree of quenching is elucidated based on the QD–thiolate bond of CdTe@ZnS being more sensitive to oxidation from ONOO− than CdTe. The selectivity of the probe in the presence of co-existing species followed the order: GSH–TGA–CdTe@ZnS>MPA–TGA–CdTe@ZnS>MPA–CdTe QDs. QDs capped with MPA showed less selectivity for ONOO− than GSH. The best limit of detection (LOD) of 12.6 nM was obtained for MPA–TGA–CdTe@ZnS QDs. Time-resolved fluorescence measurements indicated that the interaction between ONOO− and the QDs is static in nature.
Elsevier
以上显示的是最相近的搜索结果。 查看全部搜索结果