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Voltammetric Determination of Anticancer Drug Flutamide and Its Metabolite 4-Nitro-3-trifluoromethylaniline
Radová, Jitka ; Barek, Jiří (advisor) ; Dejmková, Hana (referee)
The subject of this Diploma Thesis has been the study of electrochemical behavior of anticancer drug flutamide (FLD) and one of its metabolites 4-nitro-3-trifluoromethylaniline (NTMA). The aim was to find and define the optimum conditions for the determination of both compounds at a mercury meniscus modified silver solid amalgam electrode (m-AgSAE) and at a carbon film electrode (CFE) using DC voltammetry (DCV) and differential pulse voltammetry (DPV). This Diploma Thesis follows closely the Bachelor Thesis, defended at the Department of Analytical Chemistry, Faculty of Science, Charles University in Prague. In this Bachelor Thesis, a voltammetric determination of FLD using DCV and DPV at m-AgSAE has been described, with attained limits of quantification (LQs) 5.0·10-6 mol.dm-3 (for DCV) and 3.0·10-6 mol.dm-3 (for DPV). In presented Diploma Thesis, voltammetric behavior of NTMA has been studied in dependence on the pH of the medium of Britton-Robinson (BR) buffer-methanol (9:1). The optimum conditions have been found for the determination of this substance using DCV and DPV at m-AgSAE and CFE in the cathodic area. As the optimum media, BR buffer-methanol (9:1) of resulting pHf 8.3 (for both DCV and DPV at m-AgSAE) and of pHf 5.1 (for both DCV and DPV at CFE) have been chosen. Further, the LQs have...
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New Electrochemical Methods for Determination of Nitro and Oxo Derivatives of Fluorene
Vyskočil, Vlastimil ; Barek, Jiří (advisor) ; Ludvík, Jiří (referee) ; Heyrovský, Michal (referee)
4. Conclusion This Thesis represents a contribution to the search for new analytical methods applicable on environmental and biological samples. The current state- of-art concerning the formation, occurrence, and biological activity of fluorene and its nitro and oxo derivatives was summarized in Chapter 1. Further experimental work was focused on assessment of new approaches in the detection of the studied compounds. Attention was paid mainly to nitrofluorenes, fluorenone and nitrofluorenones, namely 2-nitrofluorene, 2,7-dinitrofluorene, 9-fluorenone, 2-nitro-9-fluorenone, and 2,7-dinitro-9- fluorenone and the possibilities of their determination using polarographic and voltammetric methods. Interactions of calf thymus dsDNA with 2-nitrofluorene and 2,7-dinitrofluorene at the DNA/SPCPE were investigated and subtle DNA damage under conditions of direct DNA-analyte interaction at room temperature and damage to DNA bases under condition of electrogeneration of short-lived radicals of nitrofluorenes at human body temperature were found. The obtained results can be summarized as follows: ● Modern polarographic and voltammetric methods at mercury electrodes developed for determination of trace amounts of 9-fluorenone and 2,7-dinitro-9-fluorenone (and other NPAHs generally) in concentration ranges from 2×10-8 to...
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Voltammetric Determination of 4-Nitrobiphenyl at a Mercury Meniscus Modified Silver Solid Amalgam Electrode
Horáková, Eva ; Schwarzová, Karolina (referee) ; Barek, Jiří (advisor)
The presented bachelor thesis is devoted to study of electrochemical behavior of 4-nitrobiphenyl (4-NBP) and to finding of optimum conditions for its' determination using direct current voltammetry (DCV) and differential pulse voltammetry (DPV) at a mercury meniscus modified silver solid amalgam electrode (m-AgSAE). The aim was to achieve the lowest possible limit of determination and to verify the applicability of the newly developed method for determination of 4-NBP in model samples of drinking water. Methanol-acetate buffer pH 4,8 (3:7) was found as an optimum medium for the determination of 4 NBP at a m-AgSAE in deionized water. During DCV it is not necessary to apply electrochemical regeneration of the working electrode, during DPV it is proper to apply following regeneration potentials: Ereg,1 = 0 mV, Ereg,2 = -1300 mV. The concentration dependence of the peak current was found to be linear for both methods for 10-5, 10-6 and 10-7 mol∙l-1 concentration ranges. The limit of determination of 4-NBP both by DCV and by DPV is 2∙10-7 mol∙l-1. The optimum medium for the determination of 4-NBP in drinking water is the mixture of the sample and acetate buffer pH 4,8 in the 9:1 ratio.. During DCV regeneration was not applied, during DPV it was applied with the following regeneration potentials: Ereg,1...
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