Supporting Information
Exploring the interactions between gold nanoparticles and analytes through
surface-assisted laser desorption/ionization mass spectrometry
Yang-Wei Lin, Wen-Tsen Chen and Huan-Tsung Chang*
Department of Chemistry, National Taiwan University, Taipei, Taiwan
*Correspondence to: H.-T. Chang, Department of Chemistry, National Taiwan
University, Roosevelt Road, Sec. 4, Taipei 106, Taiwan.
E-mail: changht@ntu.edu.tw
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Supplementary Figure S1. (a) UV-Vis absorption spectra and (b) TEM images of
mixtures containing MPA–Au NPs and PDCA (1.0 mM) in (A) the absence and (B)
the presence of Hg2+ (10.0 M). The concentration of the MPA–Au NPs was 3.0 nM.
Buffer: 25 mM TB solution (pH 9.00). Extinction is plotted in arbitrary units (a.u.).
2
Supplementary Figure S2. Luminescence spectra of the 11-MUA–Au NDs (100 nM)
in (A) the absence and (B) the presence of H2O2 (50 mM). Excitation wavelength: 375
nm; buffer: 0.25 mM ammonium citrate (pH 8.00); fluorescence intensity (IF) plotted
in arbitrary units (a.u.).
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Supplementary Table 1. Comparison of the present approach with previous methods
for the detection of Hg2+ and H2O2 in aqueous solution
Hg2+
Target
LOD (M)
Methods
LOQ (M)
–7
–6
SALDI-MS
Other
methods
3.0×10
Ref.
This work
LOD (M)
LOQ (M)
–4
–4
Ref.
2.5×10
5.0×10
This work
1
3.0×10–8
1.0×10–7
6
1.0×10
–4
7
1.0×10–7
2.5×10–7
–8
–7
1.0×10
2
–
4.0×10–6
2.0×10–5
3
1.8×10–8
2.0×10–8
8
3.0×10–6
1.0×10–5
4
5.0×10–7
1.0×10–5
9
–8
–8
5
–9
–9
3.0×10
1.0×10
a
1.0×10
H2O2
2.5×10
a
2.0×10
5.0×10
10
The value is not provided in the literature.
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