Using a 1,8-diamino naphthalene–copper (II) system as a turn-on fluorescence probe for detecting Sudan I |
| |
| Authors: | Jinshui Liu Zihan Zhou Lizhen Wang Meijiao Xu |
| |
| Institution: | 1. State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, P. R. China;2. The Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials Science, Ministry of Education, Anhui Normal University, Wuhu, P. R. China;3. The Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials Science, Ministry of Education, Anhui Normal University, Wuhu, P. R. China |
| |
| Abstract: | An easy-to-use fluorescence probe for detecting Sudan I was developed. The probe detects Sudan I because Sudan I and 1,8-diamino naphthalene competitively interact with copper (II). Copper (II) effectively quenches the fluorescence of 1,8-diamino naphthalene because the 1,8-diamino naphthalene interacts with copper (II) and forms a 1,8-diamino naphthalene–copper (II) complex. Adding Sudan I causes the fluorescence of the system to be recovered because the Sudan I removes copper (II) from the 1,8-diamino naphthalene–copper (II) complex, liberating the 1,8-diamino naphthalene. The displacement of 1,8-diamino naphthalene by Sudan I gives a high fluorescence recovery efficiency. Under optimal conditions, the fluorescence intensity F achieved when Sudan I was added had a good linear relationship (R2?=?0.999) with the Sudan I concentration over the range 0–4.6?µM. The Sudan I detection limit was 0.032?µM. The method offers a new way of quantitatively determining Sudan I. |
| |
| Keywords: | 1 8-Diamino naphthalene copper (II) fluorescence Sudan I |
|
|
