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Enhancement Voltammetric Determination of Biophenolic Compounds

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Tutor: WuQingSheng
School: Tongji University
Course: Inorganic Chemistry
Keywords: Phenolics,Cyclic voltammetry,Determine,Electrode
CLC: O657.1
Type: Master's thesis
Year:  2008
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Abstract:
Phenolic compounds are widely used in many fields of chemicals, pharmaceuticals, dyes, tanning and cosmetics. At present, a lot of the method of determination of phenols, but these methods take a long time before, or the analysis of the extracts are more troublesome, so look for the quick and easy determination means necessary. Electrochemical method is a simple, fast, reliable, and suitable for field detection method. In this paper, the use of the sensitizing effect of surfactants and carbon nanotube modified electrode and determination to achieve a variety of phenols by electrochemical methods. , Studied by cyclic voltammetry on carbon nanotube modified glassy carbon electrode electrochemical behavior of ferulic acid to provide a simple, rapid determination method for Determination of ferulic acid in Chinese herbal medicine. Preparation of carbon nanotube modified glassy carbon electrode, this electrode in the determination of ferulic acid showed good stability and reproducibility, optimization of the measured parameters. Ferulic acid in carbon nanotube modified glassy carbon electrode in 0.1 mol L -1 pH = -0.2 ~ 0.8 V at 5.5 acetate buffer solution of a pair of redox peaks oxidation peak current and ferulic acid concentration of 1.0 × 10 -5 to 5.0 × 10 -3 mol / L a good linear relationship between, linear regression equation: I = 8.7788 0.8561C (where I is the peak current of the size of the unit is 10 -6 AS -1 C is the concentration of ferulic acid, unit 10 The correlation coefficient R -6 mol · L -1 ) is 0.9995, and the detection limit of 1 × 10 -7 mol / L. Apply to the determination of ferulic acid in proprietary Chinese medicines, the method for the determination of of spearheading the trace of ferulic acid, the recovery rate of 98.9% to 101.1%. Second, the presence of the surfactant sodium dodecyl sulfate (SLS) with cyclic voltammetry, electrochemical determination of tea polyphenols, the method is simple, rapid, provides for the determination of tea polyphenols new ideas. 0.1 mol L -1 pH = 6.5 phosphate buffer solution, tea polyphenols showed an obvious oxidation peak, found that by adding a surfactant, experimented and constantly optimize the conditions under The agent can enhance the detection sensitivity. Does not require any pre-processing applications without any modification of the glassy carbon electrode can be achieved Determination of tea polyphenols. The linear range of 1 × 10 -6 ~ 1 × 10 -3 mol / L, the oxidation peak current with increasing concentrations and the linear increase, corresponding regression equation an as I = 1.1175C 7.8233 (where I is the peak current size, the unit is 10 -6 AS -1 C is the concentration of tea polyphenols, unit 10 < sup> -6 mol · L -1 ), the correlation coefficient R of 0.9996 to noise ratio of theoretical calculations based on three times the letter - a detection limit of 4.2 × 10 -7 mol · L -1 . Environmental pollutants - nitrophenol in carbon nanotube modified glassy carbon electrode electro-oxidation behavior by cyclic voltammetry. 0.29V at a sensitive oxidation peak. 2 - nitrophenol concentration of 2.9 × 10 -7 to 1.0 × 10 -4 mol · L -1 , the oxidation peak The current concentration showed a good linear relationship, the corresponding regression equation was I = 2.5735C 6.227 (where I is the peak current size in 10 -6 A, C 2 - denitrification based phenol concentration, unit 10 -6 mol · L -1 ), the correlation coefficient was 0.998, in open-circuit conditions enrichment 3min, 2 - nitrophenol detection limit to 1.1 × 10 -7 mol · L -1 . Optimization of experimental conditions, the 2 - nitrophenol detection. This has opened up a new direction for the application of nanoparticles.
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