EPR Study of Iron Ion Complexes in Human Blood
نویسندگان
چکیده
Electronic states of iron ion complexes in human blood from patients with melanoma have been investigated by electron paramagnetic resonance (EPR). The measurements were performed at liquid nitrogen temperature (77 K) on an X-band EPR spectrometer. Numerous types of iron paramagnetic centers have been identified. In several kinds of protein complexes exemplified by methemoglobin, transferrin or ferritin, various forms of trivalent iron have been found. Three groups of patients with typical EPR spectra have been individualized. These groups differed in types and concentration of paramagnetic centers in peripheral blood. A good correlation has been found between the EPR results, the total iron ion complexes concentration and transferrin saturation.
منابع مشابه
Dopamine-conjugated apoferritin protein nanocage for the dual-targeting delivery of epirubicin
Objective(s): Nanocarriers are drug delivery vehicles, which have attracted the attention of researchers in recent years, particularly in cancer treatment. The encapsulation of anticancer drugs using protein nanocages is considered to be an optimal approach to reducing drug side-effects and increasing the bioavailability of anticancer drugs. Epirubicin (EPR) is an active chemotherapeutic medica...
متن کاملDirect detection and quantification of transition metal ions in human atherosclerotic plaques: evidence for the presence of elevated levels of iron and copper.
OBJECTIVE The involvement of transition metals in atherosclerosis is controversial. Some epidemiological studies have reported a relationship between iron (Fe) and cardiovascular disease, whereas others have not. Experimental studies have reported elevated levels of iron and copper (Cu) in diseased human arteries but have often used methods that release metal ions from proteins. METHODS AND R...
متن کاملSynthesis and Characterization of New Schiff Bases of Ethylenediamine and Benzaldehyde Derivatives, Along with Their Iron Complexes
Two new symmetrical Schiff bases have been prepared by the condensation of ethylenediamine and two benzaldehyde derivatives, 2-hydroxybenzaldehyde and 2,4-dimethoxybenzaldehyde. The electronic transitions within these Schiff bases molecules in chloroform solvent have been investigated by UV-Vis spectroscopy. The 1H NMR and IR spectra were studied and assigned to related groups. Furthermore,...
متن کاملElectromagnetic Properties of Hemoproteins III. ELECTRON PARAMAGNETIC RESONANCE CHARACTERISTICS OF IRON (III) AND MANGANESE (II) PROTOPORPHYRINS IX AND THEIR APOHEMOPROTEIN COMPLEXES IN HIGH SPIN STATES*
Manganese protoporphyrin IX was recombined with apoproteins of cytochrome c peroxidase, horseradish peroxidase, myoglobin, and hemoglobin to prepare artificial hemoproteins containing the manganese porphyrin in place of protoheme or iron protoporphyrin IX. Electron paramagnetic resonance (EPR) spectra of manganese (II) protoporphyrin IX and its apohemoprotein complexes were measured at Xand K-b...
متن کاملStructure and Magnetic Properties of Trigonal Bipyramidal Iron Nitrosyl Complexes
Non-heme Fe(II) proteins form stable nitrosyl adducts. However, there are few synthetic examples of structurally characterized non-heme iron nitrosyl complexes, especially those that are coordinatively unsaturated. Presented herein is a series of non-heme {Fe-NO}7 complexes with trigonal bipyramidal coordination geometry. These complexes were synthesized with tripodal ligands derived from tris(...
متن کامل