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Interactions of tamarixetin and isorhamnetin with copper
Lomozová, Zuzana ; Karlíčková, Jana (advisor) ; Chocholouš, Petr (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical Botany Candidate: Zuzana Lomozová Supervisor: PharmDr. Jana Karlíčková, Ph.D. Title of Thesis: Interactions of tamarixetin and isorhamnetin with copper Keywords: tamarixetin, isorhamnetin, chelation, reduction, copper, bathocuproine, hematoxylin Copper is a biogenic trace element important for proper function of human organism. It is an essential part of several enzymes and is involved in metabolic processes in the body. Excess or lack of serum copper can lead to pathological conditions. Copper chelating agents are used to treat copper toxic effects. Flavonoids are polyphenolic substances belonging to secondary metabolites of various plants. They are part of the human diet and have a positive impact on our health. They exhibit antioxidant and anti-inflammatory effects and are able to chelate transient metals, especially iron and copper. Chelation therapy is currently used in Wilson's disease in which copper is overloaded. In the future, the chelating effects of flavonoids could be used to treat neurodegenerative diseases, cardiovascular diseases or cancer. In this diploma thesis, interactions of two flavonoids (namely tamarixetin and isorhamnetin) with copper ions in different buffers were tested....
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Interference of reducing agents with the hematoxylin assay for determination of cupric chelation
Zsáková, Emily ; Mladěnka, Přemysl (advisor) ; Vorčáková, Katarína (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacology & Toxicology Student: Emily Zsáková Supervisor: Assoc. Prof. Přemysl Mladěnka, PharmD., Ph.D. Title of diploma thesis: Interference of reducing agents with the hematoxylin assay for determination of cupric chelation Copper is an essential trace element of living organisms. Disorders of its homeostasis affect various pathological conditions. In excessive amounts, it is toxic due to its ability to form free radicals. Vitamin C, trolox (a water soluble form of vitamin E), glutathione and hydroxylamine possess reducing properties that protect our body from oxidative tissue damage. Oxidized glutathione (GSSG) was also tested for comparison. The object of study was to test the chelating ability of these substances. A simple and fast spectrophotometric method was used. The combination of reducing properties of copper and chelating agents could lead to an improvement in chelation therapy either in heavy metal poisoning, treatment of Wilson's disease, or other diseases. We found that all substances were chelators/copper-chelating agents in vitro in a slightly competitive environment, using hematoxylin as an indicator. However, by using the bathocuproine assays to verify chelating properties, none of the substances...
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Comparison of interactions of equol and desmethylangolensin with iron and copper
Němcová, Hana ; Karlíčková, Jana (advisor) ; Matysová, Ludmila (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical Botany Candidate: Hana Němcová Supervisor: PharmDr. Jana Karlíčková, Ph.D. Title of Thesis: Comparison of interactions of equol and desmethylangolensin with iron and copper Iron and copper are essential trace elements, which are important for our body. Both elements have a significant effect on the correct function of organs and make part of many enzymes. They are able to accept or donate electrons - conversion between oxidized (Fe3+, Cu2+) and reduced (Fe2+, Cu+) forms. If these metals are excess in organism, they are accumulated in the cells and mediate the creation of free radicals, that destroy cell structures. This deficiency is treated with chelators, which facilitate the excretion of metals from the body. Isoflavonoids are polyfenolic substances, which can have antioxidant effects and they are involved in the scavening of free radicals. Isoflavonoids can have also a pro-oxidative effect, because they are able to reduce metal ions. In this study were tested interactions (chelation and reduction) between the metabolites of isoflavonoids (equol and desmethylangolensin) and ions of iron and copper. Both metabolites only weakly chelate metal ions, but they significantly reduce cupric ions. KEYWORDS: Iron,...
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