Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10561158 | Talanta | 2005 | 5 Pages |
Abstract
A sensitive method for the detection of catecholamine based on the fluorescence quenching of CdSe nanocrystals was developed. The sodium citrate-protected CdSe nanocrystals were synthesized in water solution. The fluorescence quenching of CdSe nanocrystals by dopamine, uric acid, ascorbic acid and catechol was studied; the results showed that all of these four kinds of compounds could quench the fluorescence of nanocrystals, and the quenching constant was 6.3 Ã 104, 2.57 Ã 103, 2.14 Ã 103 and 1.168 Ã 103, respectively. The order of sensitivity for the biosensor was: dopamine > lactic acid > ascorbic acid > catechol. This method shows good selectivity for dopamine, the detection limit reaches 5.8 Ã 10â8 M.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Ying Ma, Cheng Yang, Nan Li, Xiurong Yang,