Resonance Rayleigh Scattering Spectral Determination of Vitamin C by Nanogold Catalysis

2012 ◽  
Vol 260-261 ◽  
pp. 815-819
Author(s):  
Gui Qing Wen ◽  
Zhi Liang Jiang
Keyword(s):  
Detection Limit ◽  
Vitamin C ◽  
Spectral Method ◽  
Correlation Coefficient ◽  
Rayleigh Scattering ◽  
Resonance Rayleigh Scattering ◽  
Spectral Determination ◽  
Beverage Samples ◽  
Nanogold Catalysis

The nanogold catalysis effect on the reaction between HAuCl4 and Vitamin C (VC) was studied by resonance Rayleigh scattering (RS) spectroscopy at 540 nm, and a simple, rapid RS spectral method was established to determine VC. Under the chosen conditions, the increased intensity at 540 nm was linear to the VC concentration in the range of 7×10-6-2.8×10-4mol/L, with a regression equation of ΔI540 = 2.98 CVC + 13.4, a correlation coefficient of 0.9909 and a detection limit of 2×10-6 mol/L VC. The proposed method was applied to detect VC content in VC tablets and beverage samples, with simplicity, rapidity and accuracy.

Resonance Rayleigh Scattering Spectral Determination of As(V) Using Cu(II) as Catalyst

2013 ◽  
Vol 788 ◽  
pp. 23-26
Author(s):  
Gui Qing Wen ◽  
Ai Hui Liang
Keyword(s):  
Waste Water ◽  
Detection Limit ◽  
Spectral Method ◽  
Correlation Coefficient ◽  
Rayleigh Scattering ◽  
Resonance Rayleigh Scattering ◽  
Spectral Determination ◽  
Strong Resonance ◽  
Hcl Medium

In HCl medium and in the presence of CuSO4, Na3AsO4 can be reduced by NaH2PO2 to form As nanoparticles (AsNs) which exhibited a strong resonance Rayleigh scattering (RRS) peak at 370 nm. Under the chosen conditions, the increased intensity at 370 nm was linear to As5+ concentration in the range of 0.48-38.0×10-6 mol/L, with a regression equation of ΔI370nm = 82.3 CAs + 33.9, a correlation coefficient of 0.9878 and a detection limit of 2.0×10-7 mol/L As5+. The proposed method was applied to detect As5+ concentration in waste water, with simplicity, rapidity and accuracy. Thus, a novel RRS spectral method was established to determine As5+.

Resonance Rayleigh Scattering Determination of Trace Hemin Basing on Aptamer-Modified Nanogold Catalysis of HAuCl4-Vitamine C

2013 ◽  
Vol 787 ◽  
pp. 400-403
Author(s):  
Jin Chao Dong ◽  
Ai Hui Liang ◽  
Zhi Liang Jiang
Keyword(s):  
Detection Limit ◽  
Rayleigh Scattering ◽  
Resonance Rayleigh Scattering ◽  
Serum Samples ◽  
Buffer Solution ◽  
Strong Resonance ◽  
Scattering Spectra ◽  
Vitamine C ◽  
Nanogold Catalysis

Hemin aptamer was used to modify gold nanoparticles (AuNPs) to obtain a stable aptamer-nanogold probe (AussDNA). In the condition of pH 8.0 Tris-HCl buffer solution containing 50mmol/L NaCl, the substrate chain of AussDNA was cracked by hemin to produce a short single-stranded DNA(ssDNA) and then further combined with hemin to form a stable hemin-ssDNA conjugate. The AuNPs released from AussDNA would be aggregated in the condition of 50mmol/L NaCl and exhibited a strong resonance Rayleigh scattering (RRS) peak at 368nm. Under the selected conditions, the increased RRS intensity (ΔI368nm) was linear to hemin concentration in the range of 5-750nmol/L, with a detection limit of 66 pmol/L. This RRS method was applied to determination of residual hemin in serum samples, with satisfactory results. The remnant AussDNA in the solution exhibited a strong catalytic activity on the gold particle reaction of HAuCl4-vitamine C (VC) that can be monitored by RRS technique at 368 nm. When the hemin concentration increased, the AussDNA decreased, the catalysis decreased, and the RRS intensity at 368nm decreased. The decreased RRS intensity ΔI368nmwas linear to the hemin concentration in the range of 1-200nmol/L, with a detection limit of 54 pmol/L. Accordingly, a sensitivity, selectivity, and simplicity new method of resonance Rayleigh scattering spectra to detect hemin using aptamer-modified nanogold as catalyst was established.

Resonance Rayleigh Scattering Spectral Determination of Se Using NaH2PO2 as Reducer

2013 ◽  
Vol 787 ◽  
pp. 396-399
Author(s):  
Yuan Li ◽  
Ai Hui Liang ◽  
Wen Qing Yin ◽  
Zhi Liang Jiang
Keyword(s):  
Detection Limit ◽  
Linear Regression ◽  
Rayleigh Scattering ◽  
Selenium Nanoparticles ◽  
Resonance Rayleigh Scattering ◽  
Spectral Determination ◽  
Linear Regression Equation ◽  
Peak Intensity ◽  
Hcl Medium

In the HCl medium of 0.90 mol/L, Se (IV) was reduced by NaH2PO2and generated selenium nanoparticles, and there is a resonance Rayleigh scattering (RRS) peak at 588 nm. Under the selected conditions, with the increased of Se (IV) concentration, generated selenium nanoparticles increased, the resonance Rayleigh scattering peak intensity (ΔI588nm) at 588 nm was increased, and the ΔI588nmhad good linear relationship to Se (IV) concentration in the range of 0.1-1.5 mg/L, with a linear regression equation of ΔI588nm= 489.9C+ 9.0, the detection limit of 12.0 μg/L.

scholarly journals A Simple and Selective Nanocatalytic Resonance Rayleigh Scattering Spectral Method for the Determination of Trace Re

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Shengmian Wang ◽  
Guiqing Wen ◽  
Tingsheng Li ◽  
Xianjiu Liao ◽  
Aihui Liang ◽  
...  
Keyword(s):  
Detection Limit ◽  
Spectral Method ◽  
Rayleigh Scattering ◽  
Catalytic Effect ◽  
Resonance Rayleigh Scattering ◽  
Strong Resonance ◽  
Hcl Medium

In the HCl medium, rhenium (VII) or Re nanoparticles exhibited strong catalytic effect on the slow Te particle reaction between Te(VI) and Sn(II) at 70°C. The product of formed Te particles shows two strong resonance Rayleigh scattering peaks at 778 nm and 540 nm. The RS intensity at 778 nm enhanced linearly with Re concentration. The enhanced RS intensity was linear Re concentration in the range of 0.01–2.0 nmol·L−1, with a detection limit of 0.005 nmol·L−1Re. This method was applied to the analysis of Re in ore sample, and the results were in agreement with that of the spectrophotometry.

Resonance Rayleigh Scattering Spectral Method for Trace Fe3+ Using 1, 4-Dithiothreitol-Modified Nanogold as Probe

2012 ◽  
Vol 260-261 ◽  
pp. 701-706
Author(s):  
Gui Qing Wen ◽  
Liang Qin Wu ◽  
Zhi Liang Jiang
Keyword(s):  
Detection Limit ◽  
Spectral Method ◽  
Correlation Coefficient ◽  
Water Samples ◽  
Rayleigh Scattering ◽  
Regression Equation ◽  
Resonance Rayleigh Scattering

1, 4-dithiothreitol (DTT) combined with nanogold (AuNP) to form the DTT-AuNP probe in the solution of 1.0 mmol/L H2SO4. In the presence of Fe3+, the DTT-AuNPs aggregated to big particles that exhibited a maximum Resonance Rayleigh scattering (RRS) peak at 770 nm. Under the chosen conditions, the increased intensity was linear to Fe3+ concentration in the range of 7.3-149.5µg/L, with the regression equation of ΔI770nm = 127.5C +11.2, the correlation coefficient of 0.9954 and the detection limit of 3.75 ug/L Fe3+. The proposed method was applied to detect trace Fe3+ in water samples, with satisfactory results.

A Resonance Rayleigh Scattering Method for the Determination of Trace Benzotriazole Based on Complex Particle

2013 ◽  
Vol 830 ◽  
pp. 448-451
Author(s):  
Ling Ling Ye ◽  
Ai Hui Liang
Keyword(s):  
Detection Limit ◽  
Nitrogen Atom ◽  
Rayleigh Scattering ◽  
Hydroxylamine Hydrochloride ◽  
Regression Equation ◽  
Resonance Rayleigh Scattering ◽  
Scattering Method ◽  
Buffer Solution ◽  
Complex Particle

In pH 4.2 HAc-NaAc buffer solution, hydroxylamine hydrochloride reduced Cu2+ to Cu+ that coordinate the nitrogen atom of 1,2,3-benzotriazole (BTA) to form Cu-BTA complex particles with a resonance Rayleigh scattering (RRS) peak at 369 nm. Under the selected conditions, when the BTA concentration increased, the RRS intensity at 369 nm increased. The increased RRS intensity ΔI369nm was linear to BTA concentration in the range of 0.17-13.36 µg/mL, with a regression equation of ΔI369nm = 89.91C + 96.7, and the detection limit is 0.17 µg/mL. Accordingly, a new RRS method for BTA was established.

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