Electronic Supplementary Material
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Nanosensor for dopamine and glutathione based on the quenching and recovery of the
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fluorescence of silica-coated quantum dots
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Xiangzhao Ai, Qiang Ma, Xingguang Su*
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Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun,
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130012, China
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*Corresponding author, Tel.: +86-431-85168352, E-mail address: suxg@jlu.edu.cn
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Fig. S1 The mean hydrodynamic diameter of QDs, QDs@silica and QDs@silica–dopamine
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in water. The concentration of QDs, QDs@silica and QDs@silica–dopamine are
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2.5×10-7 mol L-1, 8.0 g L-1 and 8.0 g L-1 (dopamine is 0.5 mmol L-1), respectively.
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Fig. S2 The zeta potential of QDs, QDs@silica and QDs@silica–dopamine in water. The
concentration of QDs, QDs@silica and QDs@silica–dopamine are 1×10-6 mol L-1,
3.22 g L-1 and 3.22 g L-1 (dopamine is 0.5 mmol L-1), respectively.
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Fig. S3 The relationship between the decrease of PL intensity (ΔF=I0-I) of QDs@silica and
pH value in the presence of 12.88 g L-1 QDs@silica and 0.1 mmol L-1 dopamine. I0
and I are the PL intensity in the absence and presence of dopamine.
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Fig. S4 The photoluminescence (PL) intensity of QDs@silica in different pH environment
(PBS, 10 mmol L-1).
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Fig. S5 The relationship between photoluminescence (PL) intensity of QDs@silica and
incubation time in the presence of 0.1 mmol L-1 dopamine.
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Table S1 Analysis of dopamine by different detection methods.
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Method
Linear range
Detection limit
(μmol L-1)
(μmol L-1)
Reference
MWCN with MB composite film-modified electrode
0.4-10
0.2
(1)
Amperometric detector for microchip CE
4-500
1.2
(2)
Titanate nanotubes for detect dopamine
4.45-155
0.1
(3)
Electrochemical using porphyrin-functionalized graphene
0.01-70
0.01
(4)
Polyaniline/ruthenium complexes films on electrode
40-1200
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(5)
Electropolymerisation of L-arginine at electrode
0.5-100
0.5
(6)
100-10000
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(7)
0.5-100
0.241
This
Ultrathin films of polypyrrole derivatives
QDs@silica turn off/on nanosensor for dopamine
paper
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Table S2 Analysis of glutathione (GSH) by different detection methods.
Method
Linear range
Detection limit
(mmol L-1)
(mmol L-1)
Reference
A naphthalene derivate probe for GSH detection
0-80
0.178
(8)
Stabilization with N-ethylmaleimide
0.1-2
0.05
(9)
QDs based OFF/ON probe for detection of GSH
0-10
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(10)
0.01-1.38
0.001
(11)
NIP/Cu2+ complex fluorescent probe
0-0.21
0.006
(12)
QDs@silica turn off/on nanosensor for GSH
0.1-10
0.0637
This paper
Rhodamine B-gold nanoparticles with FRET
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