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Searching for natural cobalt chelators
Kadlecová, Kateřina ; Karlíčková, Jana (advisor) ; Carazo Fernández, Alejandro (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacognosy and Pharmaceutical Botany Student: Kateřina Kadlecová Supervisor: PharmDr. Jana Karlíčková, Ph.D. Title of diploma: Searching for natural cobalt chelators Cobalt, as a trace element, is mostly found in the human body as the central atom of vitamin B12. Its deficiency is manifested by psychological impairment, memory loss, dementia or megaloblastic anemia. In excess amount, it is toxic to the body, which has been most described in patients with MoM hip replacement surgery. Cobalt causes damage to surrounding tissue until it is destroyed, or also cardiotoxicity, thyroid hypofunction, memory and hearing loss. Flavonoids are natural polyphenolic compounds with the ability to bind metals, scavenge free radicals and hence protect against oxidative stress. The aim of the work was to determine the cobalt chelating activity of a row of flavonoids using spectrofotometric measurements in vitro at 4 pathophysiologically relevant pH conditions (pH 4.5, 5.5, 6.8 and 7.5). Of the test substances, only 3-hydroxyflavon and baicalein showed chelation activity. 3-hydroxyflavon in a 1:1 ratio achieved 100 % chelation at pH 7.5 and about 60 % at pH 6.8. Baicalein was reactive at pH 7.5 and 6.8, when at 10:1 it was able to bind about 50...
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Searching for natural cobalt chelators
Kadlecová, Kateřina ; Karlíčková, Jana (advisor) ; Carazo Fernández, Alejandro (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacognosy and Pharmaceutical Botany Student: Kateřina Kadlecová Supervisor: PharmDr. Jana Karlíčková, Ph.D. Title of diploma: Searching for natural cobalt chelators Cobalt, as a trace element, is mostly found in the human body as the central atom of vitamin B12. Its deficiency is manifested by psychological impairment, memory loss, dementia or megaloblastic anemia. In excess amount, it is toxic to the body, which has been most described in patients with MoM hip replacement surgery. Cobalt causes damage to surrounding tissue until it is destroyed, or also cardiotoxicity, thyroid hypofunction, memory and hearing loss. Flavonoids are natural polyphenolic compounds with the ability to bind metals, scavenge free radicals and hence protect against oxidative stress. The aim of the work was to determine the cobalt chelating activity of a row of flavonoids using spectrofotometric measurements in vitro at 4 pathophysiologically relevant pH conditions (pH 4.5, 5.5, 6.8 and 7.5). Of the test substances, only 3-hydroxyflavon and baicalein showed chelation activity. 3-hydroxyflavon in a 1:1 ratio achieved 100 % chelation at pH 7.5 and about 60 % at pH 6.8. Baicalein was reactive at pH 7.5 and 6.8, when at 10:1 it was able to bind about 50...
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