Selective Dopamine Chemosensing Using Silver-Enhanced Fluorescence

详细信息    查看全文

• 作者：Mainak Ganguly ; Chanchal Mondal ; Jayasmita Jana ; Anjali Pal ; Tarasankar Pal
• 刊名：Langmuir
• 出版年：2014
• 出版时间：April 15, 2014
• 年：2014
• 卷：30
• 期：14
• 页码：4120-4128
• 全文大小：655K
• 年卷期：v.30,no.14(April 15, 2014)
• ISSN：1520-5827

文摘

Condensation product of salicylaldehyde and 1,3 propylenediamine becomes a diiminic Schiff base, which is oxidized by AgNO₃ in alkaline solution, and in turn, stable Ag(0) is produced at room temperature. Under this condition, the solution exhibits intense silver nanoparticle enhanced fluorescence (SEF) with the 位_em at 412 nm. Dopamine is selectively detected down to the nanomolar level via exclusive fluorescence quenching of the SEF. Dopamine-infested solution regains the fluorescence [i.e., SEF in the presence of Hg(II) ions]. Thus dopamine and Hg(II) in succession demonstrate 鈥渢urn off/on鈥?fluorescence due to the change in the scattering cross section of Ag(0) and gives a quantitative measure of dopamine in real samples. The proposed method is free from interferences of common biocompetitors.