Zoltán May - Profile on Academia.edu (original) (raw)
Papers by Zoltán May
Plants
S-methylmethionine (SMM) is a universal metabolite of higher plants derived from L-methionine tha... more S-methylmethionine (SMM) is a universal metabolite of higher plants derived from L-methionine that has an approved priming effect under different types of abiotic and biotic stresses. Szarvasi-1 energy grass (Elymus elongatus subsp. ponticus cv. Szarvasi-1) is a biomass plant increasingly applied in phytoremediation to stabilize or extract heavy metals. In this study, Szarvasi-1 was grown in a nutrient solution. As a priming agent, SMM was applied in 0.02, 0.05 and 0.1 mM concentrations prior to 0.01 mM Cd addition. The growth and physiological parameters, as well as the accumulation pattern of Cd and essential mineral nutrients, were investigated. Cd exposure decreased the root and shoot growth, chlorophyll concentration, stomatal conductance, photosystem II function and increased the carotenoid content. Except for stomatal conductance, SMM priming had a positive effect on these parameters compared to Cd treatment without priming. In addition, it decreased the translocation and acc...
Journal of Thermal Analysis and Calorimetry
Octyl laurate phase change material (PCM) was microencapsulated by calcium alginate for eco-frien... more Octyl laurate phase change material (PCM) was microencapsulated by calcium alginate for eco-friendly low temperature energy storage. The PCM microcapsules were prepared by repeated interfacial coacervation followed by crosslinking method. In order to enhance the antibacterial properties of the as prepared capsules, the calcium alginate shell was functionalized by Ag nanoparticles. Calcium alginate-octyl laurate microcapsules possessed high latent heat of fusion values (130.8 and 128.6 J g−1 on melting and cooling, respectively) which did not significantly change when Ag nanoparticles were entrapped in the shell (127.5 and 125.2 J g−1 for melting and freezing enthalpy changes). Based on these values 71.0 and 69.0% maximal PCM content in the microcapsules were determined by the differential scanning calorimetry method. Both of the Ag-loaded and unloaded calcium alginate-octyl laurate PCM capsules maintained the high heat storing capacity after 250 warming and cooling cycles, which pro...
Handheld X-ray fluorescence spectrometry is a widely used analytical method for the determination... more Handheld X-ray fluorescence spectrometry is a widely used analytical method for the determination of the chemical composition of archaeological metal objects. Beside its several advantages (fast, cheap, portable, nondestructive, non-invasive, no sampling or special sample preparation is needed, etc.), the method has some limitations as well (surface method, geometric limitations, inhomogeneity within the objects, calibration, standardisation, etc.), which are needed to take into consideration during data evaluation and interpretation. In this present study, the possibilities of the handheld XRF are demonstrated on the example of 3 rd-4 th century AD Roman silver platters from the collection of the Hungarian National Museum (platters and the basin from the Seuso Treasure, three platters from the Sava river, two bowls from Esztergom and one plate from Nagyberki-Szalacska). The vessels were manufactured from high-quality silver (94.3-98.9 wt%), typical for the late Roman period, intentionally alloyed with copper (0.3-4.0 wt%). The rather low and constant gold and lead contents (0.4-1.1 wt% Au; 0-0.6 wt% Pb) indicate that primary cupelled silver, and not secondary remelted/reused gilded scrap silver was used for manufacture. The platters can be categorised based on their Bi/Pb and Au/Ag ratio. The different groups indicate the use of different silver ingots. Based on the presence of mercury, Seuso and Geometric Platters were decorated with fire gilding. Kivonat A hordozható (kézi) röntgenfluoreszcens spektrométer széles körben alkalmazott vizsgálati eszköz, melyet gyakran használnak régészeti korú fémtárgyak kémiai összetételének meghatározására. Számos előnye mellett (gyors, olcsó, hordozható, roncsolásmentes, nem igényel mintavételt vagy különösebb mintaelőkészítést, stb.), korlátai is vannak (felületi módszer, geometriai korlátok, tárgyakban lévő inhomogenitások, kalibráció, sztenderdizálás, stb.), melyeket fontos figyelembe venni a kapott adatok megfelelő kiértékeléséhez és értelmezéséhez. Tanulmányunkban a hordozható XRF alkalmazási lehetőségeit mutatjuk be a Magyar Nemzeti Múzeumban őrzött római kori ezüsttálak példáján, amelyek a következők: a Seuso-kincs táljai, a Száva folyó medréből előkerült három tál és az Esztergom közelében talált két tál a 4. századból, valamint a nagyberkiszalacskai tányér a 3. századból. Az edények a késő császárkorra jellemző nagy tisztaságú ezüstből (94,3-98,9 tömeg%) készültek, amit tudatosan rézzel ötvöztek (0,3-4,0 tömeg%). A viszonylag kicsi és konstans arany-és ólomtartalom (0,4-1,1 tömeg% Au; 0-0,6 tömeg% Pb) arra utal, hogy a készítés során elsődleges, kupellált ezüstöt használtak, nem pedig másodlagos, korábbi aranyozott ezüsttárgyak újraolvasztásával készült ezüstöt. A tálak csoportosíthatók Bi/Pb és Au/Ag arányuk alapján. A különböző csoportok eltérő ezüstöntecsek (ingotok) felhasználására utalnak. A Seuso-és a Geometrikus tálat a higany jelenléte alapján tűzi aranyozással díszítették.
Archaeological and Anthropological Sciences
This study details the non-destructive chemical analysis of composite silver objects (ewers, situ... more This study details the non-destructive chemical analysis of composite silver objects (ewers, situlas, amphora and casket) from one of the most significant late Roman finds, the Seuso Treasure. The Seuso Treasure consists of fourteen large silver vessels that were made in the fourth–early fifth centuries AD and used for dining during festive banquets and for washing and beautification. The measurements were systematically performed along a pre-designed grid at several points using handheld X-ray fluorescence analysis. The results demonstrate that all the objects were made from high-quality silver (above 90 wt% Ag), with the exception of the base of the Geometric Ewer B. Copper was added intentionally to improve the mechanical properties of soft silver. The gold and lead content of the objects shows constant values (less than 1 wt% Au and Pb). The chemical composition as well as the Bi/Pb ratio suggests that the parts of the composite objects were manufactured from different silver in...
Journal of Thermal Analysis and Calorimetry
Spray freeze-drying (SFD) is an effective method for reducing the size of thermosensitive organic... more Spray freeze-drying (SFD) is an effective method for reducing the size of thermosensitive organic substances that are sparingly soluble in water. Despite the advantages of the method, its use has not yet become widespread. We aimed at studying SFD technique for metronidazole as a heat-sensitive active pharmaceutical ingredient for reducing its particle size and investigated the morphological and physical parameters of the modified drug.The obtained particles were crystalline in all cases and their sizes were two and one order of magnitude smaller using water or dimethyl sulphoxide solutions, respectively, as compared to the initial reference metronidazole. The particle size varied depending on the experimental parameters (atomization pressure, peristaltic pump speed), although, the operating parameters had a smaller effect on the size of the materials than the applied concentration of starting solution, regardless of the solvent. The as-prepared samples had a microcrystalline struct...
Agronomy
Soil alkalinization and salinization have increased worldwide due to extreme and/or prolonged dro... more Soil alkalinization and salinization have increased worldwide due to extreme and/or prolonged drought periods as well as insufficient irrigation. Since crops generally react to soil salinity and high pH with decreased yield, the cultivation of tolerant biomass plants represents a reasonable alternative. Thus, we aimed to characterize the tolerance of the biomass plant Arundo donax to alkaline salt stress, induced by irrigation water containing NaHCO3 and Na2CO3 mixture (1:1) at 80 mM and 200 mM of final concentration and pH 10. In terms of physiological parameters such as transpiration, chlorophyll content, photosystem II quantum efficiency, relative water content, and water saturation, the plants were resistant to the stress treatment. The negative impact on the water regime was only measured at 200 mM salt. The K/Na ratio decreased in parallel with Na accumulation. Plants also accumulated Zn, whereas a decrease in the concentration of most other elements (Ca, Cu, K, Mg, Ni, S, Si,...
CCDC 201884: Experimental Crystal Structure Determination
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
CCDC 1865734: Experimental Crystal Structure Determination
CCDC 1865733: Experimental Crystal Structure Determination
CCDC 1865731: Experimental Crystal Structure Determination
European Chemical Bulletin, 2012
Magnesium participates in numerous enzymatic reactions in the human body and it has an essential ... more Magnesium participates in numerous enzymatic reactions in the human body and it has an essential role in maintaining the antioxidant system. Our purpose was to investigate the effect of magnesium on element content in blood. Male Wistar rats were divided into four groups. The animals in group I. were fed with normal diet, the animals in group II. were fed with normal diet and treated with magnesium polygalacturonate (200 mg Mg/kg body weight ad libitum daily). The animals in group III. were fed with fat rich diet containing cholesterol (2.0%), sunflower oil (20%) and cholic acid (0.5%) added to the control diet. The animals of group IV. were fed with fat-rich diet and magnesium polygalacturonate. The rats were kept on the diets for 9 days. The element concentration (Al, As, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Ni, P, Pb, S, Si, Sn, Sr, Ti, V, Zn) of blood samples was determined with an ICP-OES after digestion with a mixture of nitric acid and hydrogen peroxide. The results ...
Perspectives of magnetic and nanosized metal-containing amorphous carbon composite chemosorbents and catalysts
European Chemical Bulletin, 2012
Plantain ( Plantago lanceolata L.) is a popular medicinal plant for its beneficial effect for res... more Plantain ( Plantago lanceolata L.) is a popular medicinal plant for its beneficial effect for respiratory and other antiinflammatory diseases. As the metal ions have significant role in inflammatory processes and antiinflammatory effect, the element content of plantain drug and in extracts has been determined. Element content in drug and different extracts (decoctum and infusum) was measured by inductively plasma optical emission spectrometry (ICP-OES) after nitric acid digestion. Most of the elements in drug had average concentration, except Al, Ba, Ca, S, Sn, Sr and Ti concentration that crossed their average level. Significant difference was found in the concentration of Al, Ba, Ca, Co, Cu, Fe, K, Mg, Mn, Na, S, Sr and V between decoctum and infusum. In most cases concentration of elements was evidently higher in decoctum samples, than in infusum. In conclusion decoctum is a richer source of elements than that of other extracts and generally these teas are relevant sources for s...
Journal of Food Composition and Analysis, 2018
The elemental composition of Agaricus campestris from urban regions was assessed. The fungi f... more The elemental composition of Agaricus campestris from urban regions was assessed. The fungi from urban regions were rich in metals present in concrete and salts. The cultivated A. bisporus had low content of both toxic and nutritive elements. One-meal quantities of A. campestris grown in the city can be regularly consumed.
Journal of Colloid and Interface Science, 2017
Square Wave Voltammetric Determination of Selenium in Medicinal Plants
The determination of selenium has become important in environmental and biological samples due to... more The determination of selenium has become important in environmental and biological samples due to its narrow range of concentration between essential and toxic levels. The estimated and recommended amount for safe daily intake for humans range is from 50 to 200 µg. An easy and sensitive method was developed for measuring selenium in many kinds of samples by means of cathodic stripping voltammetry in presence of copper added. The latter makes this method more sensitive. These determinations were proceeded by method development (optimization, specificity study, linearity study, repeatability, reproducibility, precision, preparation of samples). In present article some results are showed for determination of selenium in fennel (Foeniculum vulgare), gumplant (Grindelia robusta), and lucerna (Medicago sativa) standard. It was figured out that volatility of selenium is negligible.
E3S Web of Conferences, 2013
The mineralogy, geochemistry and magnetic properties of total suspended particulate (TSP) matter ... more The mineralogy, geochemistry and magnetic properties of total suspended particulate (TSP) matter in Budapest, Hungary were studied to identify their heavy metal-bearing mineral phases. Amorphous organic matter, magnetite, salts as well as mineral phases characteristic of the surrounding geology are the main components of the TSP. They show significant enrichment in several heavy metals, such as Zn (up to 19 046 mg/kg), Pb (up to 3597 mg/kg), Cu (up to 699 mg/kg) and Mo (up to 53 mg/kg). The most frequent heavy metal-bearing mineral phases are spherular or xenomorphic magnetite particles containing 2-3 wt% Pb and Zn. They often form aggregates and are closely associated with soot and/or clay minerals. The size of these particles is rarely below 30 nm. Cu and Mo could be associated to magnetite too. Clay minerals and mica particles may also contain significant amount of Zn (up to 5wt%). Additionally, ZnO and ZnCO 3 particles were found in the sample with highest Zn content and our data suggest the potential association of Pb and carbonates, as well. Magnetite particles are resistant to weathering releasing its toxic components slowly to the environment, while layer silicates (and carbonates) may be the potential source of mobile toxic metals in the TSP.
Element intake in patients with inflammatory bowel diseases
Zeitschrift für Gastroenterologie, 2008
Hyperfine Interactions, 2008
Fe Mössbauer spectroscopy was used to determine the oxidation state and microenvironments of iron... more Fe Mössbauer spectroscopy was used to determine the oxidation state and microenvironments of iron in the Fe-polygalacturonate compound prepared by a novel method from pectin. ICP analysis was applied to study the iron content of the coordination compounds. It was found that there are two ferrous and one ferric microenvironments in the compound. In the iron-polygalacturonate compound the ferrous forms occur dominantly. A model for the bonding of Fe in the polygalacturonate chains is proposed.
International Journal of Molecular Sciences
Anthocyanidins, the aglycons of anthocyanins, are known, beyond their function in plants, also as... more Anthocyanidins, the aglycons of anthocyanins, are known, beyond their function in plants, also as compounds with a wide range of biological and pharmacological activities, including cytostatic effect against various cancer cells. The nature and position of the substituents in the flavylium cation is essential for such biological properties, as well as the equilibrium between the multistate of the different chemical species that are generated by the flavylium cation, including quinoidal base, hemiketal, and cis- and trans-chalcones. In this work, eight new flavylium derivatives were synthesized, characterized for confirmation of the structure by FT-IR and 2D-NMR, and investigated in vitro as possible cytostatic compounds against HCT116 and HepG2 cancer cells. The most active two compounds were explored for their halochromic properties that can influence the biological activity and subjected to molecular encapsulation in β-cyclodextrin derivatives in order to increase their solubility...
Plants
S-methylmethionine (SMM) is a universal metabolite of higher plants derived from L-methionine tha... more S-methylmethionine (SMM) is a universal metabolite of higher plants derived from L-methionine that has an approved priming effect under different types of abiotic and biotic stresses. Szarvasi-1 energy grass (Elymus elongatus subsp. ponticus cv. Szarvasi-1) is a biomass plant increasingly applied in phytoremediation to stabilize or extract heavy metals. In this study, Szarvasi-1 was grown in a nutrient solution. As a priming agent, SMM was applied in 0.02, 0.05 and 0.1 mM concentrations prior to 0.01 mM Cd addition. The growth and physiological parameters, as well as the accumulation pattern of Cd and essential mineral nutrients, were investigated. Cd exposure decreased the root and shoot growth, chlorophyll concentration, stomatal conductance, photosystem II function and increased the carotenoid content. Except for stomatal conductance, SMM priming had a positive effect on these parameters compared to Cd treatment without priming. In addition, it decreased the translocation and acc...
Journal of Thermal Analysis and Calorimetry
Octyl laurate phase change material (PCM) was microencapsulated by calcium alginate for eco-frien... more Octyl laurate phase change material (PCM) was microencapsulated by calcium alginate for eco-friendly low temperature energy storage. The PCM microcapsules were prepared by repeated interfacial coacervation followed by crosslinking method. In order to enhance the antibacterial properties of the as prepared capsules, the calcium alginate shell was functionalized by Ag nanoparticles. Calcium alginate-octyl laurate microcapsules possessed high latent heat of fusion values (130.8 and 128.6 J g−1 on melting and cooling, respectively) which did not significantly change when Ag nanoparticles were entrapped in the shell (127.5 and 125.2 J g−1 for melting and freezing enthalpy changes). Based on these values 71.0 and 69.0% maximal PCM content in the microcapsules were determined by the differential scanning calorimetry method. Both of the Ag-loaded and unloaded calcium alginate-octyl laurate PCM capsules maintained the high heat storing capacity after 250 warming and cooling cycles, which pro...
Handheld X-ray fluorescence spectrometry is a widely used analytical method for the determination... more Handheld X-ray fluorescence spectrometry is a widely used analytical method for the determination of the chemical composition of archaeological metal objects. Beside its several advantages (fast, cheap, portable, nondestructive, non-invasive, no sampling or special sample preparation is needed, etc.), the method has some limitations as well (surface method, geometric limitations, inhomogeneity within the objects, calibration, standardisation, etc.), which are needed to take into consideration during data evaluation and interpretation. In this present study, the possibilities of the handheld XRF are demonstrated on the example of 3 rd-4 th century AD Roman silver platters from the collection of the Hungarian National Museum (platters and the basin from the Seuso Treasure, three platters from the Sava river, two bowls from Esztergom and one plate from Nagyberki-Szalacska). The vessels were manufactured from high-quality silver (94.3-98.9 wt%), typical for the late Roman period, intentionally alloyed with copper (0.3-4.0 wt%). The rather low and constant gold and lead contents (0.4-1.1 wt% Au; 0-0.6 wt% Pb) indicate that primary cupelled silver, and not secondary remelted/reused gilded scrap silver was used for manufacture. The platters can be categorised based on their Bi/Pb and Au/Ag ratio. The different groups indicate the use of different silver ingots. Based on the presence of mercury, Seuso and Geometric Platters were decorated with fire gilding. Kivonat A hordozható (kézi) röntgenfluoreszcens spektrométer széles körben alkalmazott vizsgálati eszköz, melyet gyakran használnak régészeti korú fémtárgyak kémiai összetételének meghatározására. Számos előnye mellett (gyors, olcsó, hordozható, roncsolásmentes, nem igényel mintavételt vagy különösebb mintaelőkészítést, stb.), korlátai is vannak (felületi módszer, geometriai korlátok, tárgyakban lévő inhomogenitások, kalibráció, sztenderdizálás, stb.), melyeket fontos figyelembe venni a kapott adatok megfelelő kiértékeléséhez és értelmezéséhez. Tanulmányunkban a hordozható XRF alkalmazási lehetőségeit mutatjuk be a Magyar Nemzeti Múzeumban őrzött római kori ezüsttálak példáján, amelyek a következők: a Seuso-kincs táljai, a Száva folyó medréből előkerült három tál és az Esztergom közelében talált két tál a 4. századból, valamint a nagyberkiszalacskai tányér a 3. századból. Az edények a késő császárkorra jellemző nagy tisztaságú ezüstből (94,3-98,9 tömeg%) készültek, amit tudatosan rézzel ötvöztek (0,3-4,0 tömeg%). A viszonylag kicsi és konstans arany-és ólomtartalom (0,4-1,1 tömeg% Au; 0-0,6 tömeg% Pb) arra utal, hogy a készítés során elsődleges, kupellált ezüstöt használtak, nem pedig másodlagos, korábbi aranyozott ezüsttárgyak újraolvasztásával készült ezüstöt. A tálak csoportosíthatók Bi/Pb és Au/Ag arányuk alapján. A különböző csoportok eltérő ezüstöntecsek (ingotok) felhasználására utalnak. A Seuso-és a Geometrikus tálat a higany jelenléte alapján tűzi aranyozással díszítették.
Archaeological and Anthropological Sciences
This study details the non-destructive chemical analysis of composite silver objects (ewers, situ... more This study details the non-destructive chemical analysis of composite silver objects (ewers, situlas, amphora and casket) from one of the most significant late Roman finds, the Seuso Treasure. The Seuso Treasure consists of fourteen large silver vessels that were made in the fourth–early fifth centuries AD and used for dining during festive banquets and for washing and beautification. The measurements were systematically performed along a pre-designed grid at several points using handheld X-ray fluorescence analysis. The results demonstrate that all the objects were made from high-quality silver (above 90 wt% Ag), with the exception of the base of the Geometric Ewer B. Copper was added intentionally to improve the mechanical properties of soft silver. The gold and lead content of the objects shows constant values (less than 1 wt% Au and Pb). The chemical composition as well as the Bi/Pb ratio suggests that the parts of the composite objects were manufactured from different silver in...
Journal of Thermal Analysis and Calorimetry
Spray freeze-drying (SFD) is an effective method for reducing the size of thermosensitive organic... more Spray freeze-drying (SFD) is an effective method for reducing the size of thermosensitive organic substances that are sparingly soluble in water. Despite the advantages of the method, its use has not yet become widespread. We aimed at studying SFD technique for metronidazole as a heat-sensitive active pharmaceutical ingredient for reducing its particle size and investigated the morphological and physical parameters of the modified drug.The obtained particles were crystalline in all cases and their sizes were two and one order of magnitude smaller using water or dimethyl sulphoxide solutions, respectively, as compared to the initial reference metronidazole. The particle size varied depending on the experimental parameters (atomization pressure, peristaltic pump speed), although, the operating parameters had a smaller effect on the size of the materials than the applied concentration of starting solution, regardless of the solvent. The as-prepared samples had a microcrystalline struct...
Agronomy
Soil alkalinization and salinization have increased worldwide due to extreme and/or prolonged dro... more Soil alkalinization and salinization have increased worldwide due to extreme and/or prolonged drought periods as well as insufficient irrigation. Since crops generally react to soil salinity and high pH with decreased yield, the cultivation of tolerant biomass plants represents a reasonable alternative. Thus, we aimed to characterize the tolerance of the biomass plant Arundo donax to alkaline salt stress, induced by irrigation water containing NaHCO3 and Na2CO3 mixture (1:1) at 80 mM and 200 mM of final concentration and pH 10. In terms of physiological parameters such as transpiration, chlorophyll content, photosystem II quantum efficiency, relative water content, and water saturation, the plants were resistant to the stress treatment. The negative impact on the water regime was only measured at 200 mM salt. The K/Na ratio decreased in parallel with Na accumulation. Plants also accumulated Zn, whereas a decrease in the concentration of most other elements (Ca, Cu, K, Mg, Ni, S, Si,...
CCDC 201884: Experimental Crystal Structure Determination
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
CCDC 1865734: Experimental Crystal Structure Determination
CCDC 1865733: Experimental Crystal Structure Determination
CCDC 1865731: Experimental Crystal Structure Determination
European Chemical Bulletin, 2012
Magnesium participates in numerous enzymatic reactions in the human body and it has an essential ... more Magnesium participates in numerous enzymatic reactions in the human body and it has an essential role in maintaining the antioxidant system. Our purpose was to investigate the effect of magnesium on element content in blood. Male Wistar rats were divided into four groups. The animals in group I. were fed with normal diet, the animals in group II. were fed with normal diet and treated with magnesium polygalacturonate (200 mg Mg/kg body weight ad libitum daily). The animals in group III. were fed with fat rich diet containing cholesterol (2.0%), sunflower oil (20%) and cholic acid (0.5%) added to the control diet. The animals of group IV. were fed with fat-rich diet and magnesium polygalacturonate. The rats were kept on the diets for 9 days. The element concentration (Al, As, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Ni, P, Pb, S, Si, Sn, Sr, Ti, V, Zn) of blood samples was determined with an ICP-OES after digestion with a mixture of nitric acid and hydrogen peroxide. The results ...
Perspectives of magnetic and nanosized metal-containing amorphous carbon composite chemosorbents and catalysts
European Chemical Bulletin, 2012
Plantain ( Plantago lanceolata L.) is a popular medicinal plant for its beneficial effect for res... more Plantain ( Plantago lanceolata L.) is a popular medicinal plant for its beneficial effect for respiratory and other antiinflammatory diseases. As the metal ions have significant role in inflammatory processes and antiinflammatory effect, the element content of plantain drug and in extracts has been determined. Element content in drug and different extracts (decoctum and infusum) was measured by inductively plasma optical emission spectrometry (ICP-OES) after nitric acid digestion. Most of the elements in drug had average concentration, except Al, Ba, Ca, S, Sn, Sr and Ti concentration that crossed their average level. Significant difference was found in the concentration of Al, Ba, Ca, Co, Cu, Fe, K, Mg, Mn, Na, S, Sr and V between decoctum and infusum. In most cases concentration of elements was evidently higher in decoctum samples, than in infusum. In conclusion decoctum is a richer source of elements than that of other extracts and generally these teas are relevant sources for s...
Journal of Food Composition and Analysis, 2018
The elemental composition of Agaricus campestris from urban regions was assessed. The fungi f... more The elemental composition of Agaricus campestris from urban regions was assessed. The fungi from urban regions were rich in metals present in concrete and salts. The cultivated A. bisporus had low content of both toxic and nutritive elements. One-meal quantities of A. campestris grown in the city can be regularly consumed.
Journal of Colloid and Interface Science, 2017
Square Wave Voltammetric Determination of Selenium in Medicinal Plants
The determination of selenium has become important in environmental and biological samples due to... more The determination of selenium has become important in environmental and biological samples due to its narrow range of concentration between essential and toxic levels. The estimated and recommended amount for safe daily intake for humans range is from 50 to 200 µg. An easy and sensitive method was developed for measuring selenium in many kinds of samples by means of cathodic stripping voltammetry in presence of copper added. The latter makes this method more sensitive. These determinations were proceeded by method development (optimization, specificity study, linearity study, repeatability, reproducibility, precision, preparation of samples). In present article some results are showed for determination of selenium in fennel (Foeniculum vulgare), gumplant (Grindelia robusta), and lucerna (Medicago sativa) standard. It was figured out that volatility of selenium is negligible.
E3S Web of Conferences, 2013
The mineralogy, geochemistry and magnetic properties of total suspended particulate (TSP) matter ... more The mineralogy, geochemistry and magnetic properties of total suspended particulate (TSP) matter in Budapest, Hungary were studied to identify their heavy metal-bearing mineral phases. Amorphous organic matter, magnetite, salts as well as mineral phases characteristic of the surrounding geology are the main components of the TSP. They show significant enrichment in several heavy metals, such as Zn (up to 19 046 mg/kg), Pb (up to 3597 mg/kg), Cu (up to 699 mg/kg) and Mo (up to 53 mg/kg). The most frequent heavy metal-bearing mineral phases are spherular or xenomorphic magnetite particles containing 2-3 wt% Pb and Zn. They often form aggregates and are closely associated with soot and/or clay minerals. The size of these particles is rarely below 30 nm. Cu and Mo could be associated to magnetite too. Clay minerals and mica particles may also contain significant amount of Zn (up to 5wt%). Additionally, ZnO and ZnCO 3 particles were found in the sample with highest Zn content and our data suggest the potential association of Pb and carbonates, as well. Magnetite particles are resistant to weathering releasing its toxic components slowly to the environment, while layer silicates (and carbonates) may be the potential source of mobile toxic metals in the TSP.
Element intake in patients with inflammatory bowel diseases
Zeitschrift für Gastroenterologie, 2008
Hyperfine Interactions, 2008
Fe Mössbauer spectroscopy was used to determine the oxidation state and microenvironments of iron... more Fe Mössbauer spectroscopy was used to determine the oxidation state and microenvironments of iron in the Fe-polygalacturonate compound prepared by a novel method from pectin. ICP analysis was applied to study the iron content of the coordination compounds. It was found that there are two ferrous and one ferric microenvironments in the compound. In the iron-polygalacturonate compound the ferrous forms occur dominantly. A model for the bonding of Fe in the polygalacturonate chains is proposed.
International Journal of Molecular Sciences
Anthocyanidins, the aglycons of anthocyanins, are known, beyond their function in plants, also as... more Anthocyanidins, the aglycons of anthocyanins, are known, beyond their function in plants, also as compounds with a wide range of biological and pharmacological activities, including cytostatic effect against various cancer cells. The nature and position of the substituents in the flavylium cation is essential for such biological properties, as well as the equilibrium between the multistate of the different chemical species that are generated by the flavylium cation, including quinoidal base, hemiketal, and cis- and trans-chalcones. In this work, eight new flavylium derivatives were synthesized, characterized for confirmation of the structure by FT-IR and 2D-NMR, and investigated in vitro as possible cytostatic compounds against HCT116 and HepG2 cancer cells. The most active two compounds were explored for their halochromic properties that can influence the biological activity and subjected to molecular encapsulation in β-cyclodextrin derivatives in order to increase their solubility...