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(8) Heien, M.; Phillips, P. E. M.; Stuber, G. D.; Seipel, A. T.;
Wightman, R. M. Overoxidation of carbon-fiber microelectrodes
enhances dopamine adsorption and increases sensitivity. Analyst 2003,
128, 1413−1419.
(9) Kim, Y. -R.; Bong, S.; Kang, Y. -J.; Yang, Y.; Mahajan, R. K.; Kim,
J. S.; Kim, H. Electrochemical detection of dopamine in the presence
of ascorbic acid using graphene modified electrodes. Biosens.
Bioelectron. 2010, 25, 2366−2369.
(10) Carrera, V.; Sabater, E.; Vilanova, E.; Sogorb, M. A. A simple
and rapid HPLC-MS method for the simultaneous determination of
epinephrine, norepinephrine, dopamine and 5-hydroxytryptamine:
Application to the secretion of bovine chromaffin cell cultures. J.
Chromatogr., B 2007, 847, 88−94.
(11) Park, Y. N.; Zhang, X.; Rubakhin, S. S.; Sweedler, J. V.
Independent optimization of capillary electrophoresis separation and
native fluorescence detection conditions for indolamine and catechol-
amine measurements. Anal. Chem. 1999, 71, 4997−5002.
(12) Lin, Y.; Chen, C.; Wang, C.; Pu, F.; Ren, J.; Qu, X. Silver
nanoprobe for sensitive and selective colorimetric detection of
dopamine via robust Ag-catechol interaction. Chem. Commun. 2011,
47, 1181−1183.
(13) Yu, C.; Luo, M.; Zeng, F.; Zheng, F.; Wu, S. Mesoporous silica
particles for selective detection of dopamine with β-cyclodextrin as the
selective barricade. Chem. Commun. 2011, 47, 9086−9088.
(14) Lakowicz, J. R. Radiative decay engineering 5: metal-enhanced
fluorescence and plasmon emission. Anal. Biochem. 2005, 337, 171−
194.
(15) Mohammadi, A.; Kaminski, F.; Sandoghdar, V.; Agio, M.
Spheroidal nanoparticles as nanoantennas for fluorescence enhance-
ment. Int. J. Nanotechnol. 2009, 6, 902−914.
(16) Geddes, C. D.; Lakowicz, J. R. Metal-enhanced fluorescence. J.
Fluoresc. 2002, 12, 121−129.
(17) Aslan, K.; Lakowicz, J. R.; Geddes, C. D. Metal-enhanced
fluorescence using anisotropic silver nanostructures: Critical progress
to date. Anal. Bioanal. Chem. 2005, 382, 926−933.
(18) Zhang, J.; Lakowicz, J. R. Metal-enhanced fluorescence of an
organic fluorophore using gold particles. Opt. Express 2007, 15, 2598−
2606.
(19) Ganguly, M.; Pal, A.; Pal, T. Intriguing fluorescence behavior of
diiminic Schiff bases in the presence of in situ produced noble metal
nanoparticles. J. Phys. Chem. C 2011, 115, 22138−22147.
(20) Ganguly, M.; Pal, A.; Negishi, Y.; Pal, T. Diiminic Schiff bases:
An intriguing class of compounds for a copper-nanoparticle-induced
fluorescence study. Chem.Eur. J. 2012, 18, 15845−15855.
(21) Ganguly, M.; Mondal, C.; Chowdhury, J.; Pal, J.; Pal, A.; Pal, T.
The tuning of metal enhanced fluorescence for sensing applications.
Dalton Trans. 2014, 43, 1032−1047.
(22) Smetana, A. B.; Klabunde, K. J.; Marchin, G. R.; Sorensen, C. M.
Biocidal activity of nanocrystalline silver powders and particles.
Langmuir 2008, 24, 7457−7464.
(23) Han, Y.; Lupitskyy, R.; Chou, T.; Stafford, C. M.; Du, H.;
Sukhishvili, S. Effect of oxidation on surface-enhanced Raman
scattering activity of silver nanoparticles: A quantitative correlation.
Anal. Chem. 2011, 83, 5873−5880.
(24) Jiang, X.; Zeng, Q.; Yu, A. Thiol-frozen shape evolution of
triangular silver nanoplates. Langmuir 2007, 23, 2218−2223.
(25) Lukomska, J.; Malicka, J.; Gryczynski, Z.; Leonenko, Z.;
Lakowicz, J. R. Fluorescence enhancement of fluorophores tethered to
different sized silver colloids deposited on glass substrate. Biopolymers
2005, 77, 31−37.
(26) Nikolelis, D. P.; Drivelos, D. A.; Simantiraki, M. G.; Koinis, S.
An optical spot test for the detection of dopamine in human urine
using stabilized in air lipid films. Anal. Chem. 2004, 76, 2174−2180.
(27) Naik, R. R.; Swamy, B. E. K.; Chandra, U.; Niranjana, E.;
Sherigara, B. S.; Jayadevappa, H. Separation of ascorbic acid, dopamine
and uric acid by acetone/water modified carbon paste electrode: A
cyclic voltammetric study. Int. J. Electrochem. Sci. 2009, 4, 855−862.
(28) Choudhury, S. D.; Badugu, R.; Ray, K.; Lakowicz, J. R. Silver-
gold nanocomposite substrates for metal-enhanced fluorescence:
demonstrate fluorescent silver clusters as important candidates
for the detection of cysteine and Hg(II). Selective quenching of
fluorescence of silver clusters, due to steric factor guided
penetrating ability and short path lengths of analytes, has been
employed for detection purposes. In our case, strong silver-
enhanced fluorescence is quenched due to replacement of QL
by QDA from the proximity of Ag(0). QDA also splits the large
aggregated Ag(0) particles into smaller particles causing a
decrement of the scattering cross section and an increment of
the absorption cross section. Diluting the electric field around
the fluorophore, such small silver particles can make surface
wave lossy and decrease the rate of excitation. Little decrease in
the radiative dacay rate also speaks for quenching.14 As a result,
addition of DA to highly fluorescent AgQL selectively
quenches the fluorescence.
CONCLUSIONS
■
The ease of tactic to obtain SEF, hitherto unknown, may be a
wealth for key applications. We expect that the prescribed
approach of DA determination may offer a novel route for
developing low cost, simple, and sensitive DA biosensors, which
is likely to be extremely helpful in the vast arena of the clinical
diagnostic, biosensors, and nanotechnology domain. Again, the
selective rebirth of fluorescence by Hg(II) is also promising in
order to design a Hg(II) sensor, which has become an
important area of research to date.
ASSOCIATED CONTENT
■
S
* Supporting Information
1HNMR, IR, XRD, XPS, UV−vis, fluorescence spectra, and
fluorescence decay profile. This material is available free of
AUTHOR INFORMATION
Corresponding Author
■
Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
The authors thank the UGC, DST, NST, and CSIR, New
Delhi, India, and the IIT Kharagpur for financial assistance.
■
REFERENCES
■
(1) Wightman, R. M.; May, L. J.; Michael, A. C. Detection of
dopamine dynamics in the brain. Anal. Chem. 1988, 60, 769A−779A.
(2) Zhang, A.; Neumeyer, J. L.; Baldessarini, R. J. Recent progress in
development of dopamine receptor subtype-selective agents: potential
therapeutics for neurological and psychiatric disorders. Chem. Rev.
2007, 107, 274−302.
(3) Damier, P.; Hirsch, E. C.; Agid, Y.; Graybiel, A. M. The substantia
nigra of the human brain. II. Patterns of loss of dopamine-containing
neurons in Parkinson’s disease. Brain 1999, 122, 1437−1448.
(4) Dawson, T. M.; Dawson, V. L. Molecular pathways of
neurodegeneration in Parkinson’s disease. Science 2003, 302, 819−822.
(5) Zetterstrom, T.; Sharp, T.; Marsden, C. A.; Ungerstedt, U. In vivo
measurement of dopamine and its metabolites by intracerebral dialysis:
Changes after d-amphetamine. J. Neurochem. 1983, 41, 1769−1773.
(6) Fragoso, A.; Almirall, E.; Cao, R.; Echegoyen, L.; Gonzalez-Jonte,
R. A supramolecular approach to the selective detection of dopamine
in the presence of ascorbate. Chem. Commun. 2004, 2230−2232.
(7) Arrigan, D. W. M.; Ghita, M.; Beni, V. Selective voltammetric
detection of dopamine in the presence of ascorbate. Chem. Commun.
2004, 732−733.
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