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The influence of benzoic acids (metabolites of flavonoids) on the copper-triggered Fenton reaction and hemolysis
Harčárová, Patrícia ; Lomozová, Zuzana (advisor) ; Karlíčková, Jana (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacognosis and Pharmaceutical Botany Student: Patrícia Harčárová Supervisor: Zuzana Lomozová, MSc., Ph.D. Title of diploma thesis: Effect of benzoic acids (flavonoid metabolites) on copper catalyzed Fenton reaction and hemolysis Keywords: flavonoids, benzoic acids, copper, Fenton reaction, hemolysis Copper is a biogenic trace element that is present in several enzymes and proteins in the human body. The ability of copper to change its oxidation state is essential for its biological functions and enables enzymatic redox reactions in the organism. Homeostasis of copper is strictly regulated in the human body as its disruption can lead to the toxic effects of copper. Flavonoids are secondary plant metabolites that are a common part of our diet and their consumption has positive effects on our bodies. However, under certain conditions, they can also have a pro-oxidative effect, which is related to their ability to reduce transition metal ions. Flavonoids are massively metabolized in the human body before reaching systemic circulation into small phenolic substances including benzoic acids. Seven benzoic acid derivatives were tested as part of this thesis. Their influence on the production of hydroxyl radicals arising during the...
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Interactions of natural phenolic compounds with biogenic metals
Lomozová, Zuzana ; Mladěnka, Přemysl (advisor) ; Bittner Fialová, Silvia (referee) ; Patočka, Jiří (referee)
Charles University, Faculty of Pharmacy in Hradec Králové Department of Pharmacognosy and Pharmaceutical Botany Candidate: Zuzana Lomozová, MSc. Supervisor: Prof. Přemysl Mladěnka, PharmD., Ph.D. Title of Doctoral Thesis: Interactions of natural phenolic compounds with biogenic metals Phenolic compounds are one of the most widely distributed groups of secondary plant metabolites. They are an integral part of the human diet and their consumption is associated with a number of positive effects. They include a wide range of substances, from simple molecules such as phenolic acids to large polymeric compounds such as tannins. Because of their structure, which includes, among others, free hydroxyl groups, they are able to interact with biogenic metals and form metal complexes with them. Under normal conditions, the homeostasis of these transition metals in the body is tightly regulated, but it can be disturbed in pathological conditions such as acute myocardial infarction, when the levels of free iron and copper increase as a result of a significant decrease in pH. Similar metal imbalance is observed as well as in inflammatory and neurodegenerative diseases, tumours, or diabetes mellitus. The aim of this dissertation was to find out how these substances react with biogenic metals using in vitro and ex...
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Interactions of natural phenolic compounds with biogenic metals
Lomozová, Zuzana ; Mladěnka, Přemysl (advisor) ; Bittner Fialová, Silvia (referee) ; Patočka, Jiří (referee)
Charles University, Faculty of Pharmacy in Hradec Králové Department of Pharmacognosy and Pharmaceutical Botany Candidate: Zuzana Lomozová, MSc. Supervisor: Prof. Přemysl Mladěnka, PharmD., Ph.D. Title of Doctoral Thesis: Interactions of natural phenolic compounds with biogenic metals Phenolic compounds are one of the most widely distributed groups of secondary plant metabolites. They are an integral part of the human diet and their consumption is associated with a number of positive effects. They include a wide range of substances, from simple molecules such as phenolic acids to large polymeric compounds such as tannins. Because of their structure, which includes, among others, free hydroxyl groups, they are able to interact with biogenic metals and form metal complexes with them. Under normal conditions, the homeostasis of these transition metals in the body is tightly regulated, but it can be disturbed in pathological conditions such as acute myocardial infarction, when the levels of free iron and copper increase as a result of a significant decrease in pH. Similar metal imbalance is observed as well as in inflammatory and neurodegenerative diseases, tumours, or diabetes mellitus. The aim of this dissertation was to find out how these substances react with biogenic metals using in vitro and ex...
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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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