title: Selective dopamine chemosensing using silver-enhanced fluorescence.
abstract: 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 λ(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 "turn off/on" 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.
authors.affiliation: Department of Chemistry, Indian Institute of Technology , Kharagpur-721302, India.
authors.forename: Mainak
authors.initials: M
authors.lastname: Ganguly
authors.forename: Chanchal
authors.initials: C
authors.lastname: Mondal
authors.forename: Jayasmita
authors.initials: J
authors.lastname: Jana
authors.forename: Anjali
authors.initials: A
authors.lastname: Pal
authors.forename: Tarasankar
authors.initials: T
authors.lastname: Pal
mesh_terms: D004298:Dopamine / Q000032:analysis*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008628:Mercury / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry; D012834:Silver / Q000737:chemistry*
chemical_list: D005456:Fluorescent Dyes; D007477:Ions; D012834:Silver; D008628:Mercury; D004298:Dopamine