Zoltán May - Academia.edu (original) (raw)

Papers by Zoltán May

Research paper thumbnail of S-Methylmethionine Effectively Alleviates Stress in Szarvasi-1 Energy Grass by Reducing Root-to-Shoot Cadmium Translocation

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...

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Research paper thumbnail of Low temperature energy storage by bio-originated calcium alginate-octyl laurate microcapsules

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...

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Research paper thumbnail of A hordozható XRF alkalmazási lehetőségei és korlátai római ezüsttálak archeometriai vizsgálatában = Possibilities and Limitations of the Use of Handheld XRF in the Archaeometric Study of Roman Silver Platters

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Research paper thumbnail of Non-destructive handheld XRF study of archaeological composite silver objects—the case study of the late Roman Seuso Treasure

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...

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Research paper thumbnail of Morphology transformation of thermosensitive metronidazol by spray freeze-drying

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...

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Research paper thumbnail of Alkaline Salt Tolerance of the Biomass Plant Arundo donax

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,...

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Research paper thumbnail of 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.

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Research paper thumbnail of CCDC 1865734: Experimental Crystal Structure Determination

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Research paper thumbnail of CCDC 1865733: Experimental Crystal Structure Determination

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Research paper thumbnail of CCDC 1865731: Experimental Crystal Structure Determination

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Research paper thumbnail of Magnesium Supplementation and Microelement Homeostasis

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 ...

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Research paper thumbnail of Perspectives of magnetic and nanosized metal-containing amorphous carbon composite chemosorbents and catalysts

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Research paper thumbnail of Microelements in Drug and Extracts of Plantago Lanceolata L

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...

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Research paper thumbnail of Elemental composition of wild growing Agaricus campestris mushroom in urban and peri-urban regions of Transylvania (Romania)

Journal of Food Composition and Analysis, 2018

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Research paper thumbnail of Direct immobilization of manganese chelates on silica nanospheres for MRI applications

Journal of Colloid and Interface Science, 2017

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Research paper thumbnail of 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.

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Research paper thumbnail of Mineral phases containing heavy metals in the suspended dust from Budapest, Hungary

E3S Web of Conferences, 2013

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Research paper thumbnail of Element intake in patients with inflammatory bowel diseases

Zeitschrift für Gastroenterologie, 2008

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Research paper thumbnail of Mössbauer study on iron-polygalacturonate coordination compounds

Hyperfine Interactions, 2008

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Research paper thumbnail of Halochromic Behavior and Anticancer Effect of New Synthetic Anthocyanidins Complexed with β-Cyclodextrin Derivatives

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...

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Research paper thumbnail of S-Methylmethionine Effectively Alleviates Stress in Szarvasi-1 Energy Grass by Reducing Root-to-Shoot Cadmium Translocation

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...

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Research paper thumbnail of Low temperature energy storage by bio-originated calcium alginate-octyl laurate microcapsules

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...

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Research paper thumbnail of A hordozható XRF alkalmazási lehetőségei és korlátai római ezüsttálak archeometriai vizsgálatában = Possibilities and Limitations of the Use of Handheld XRF in the Archaeometric Study of Roman Silver Platters

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Research paper thumbnail of Non-destructive handheld XRF study of archaeological composite silver objects—the case study of the late Roman Seuso Treasure

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...

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Research paper thumbnail of Morphology transformation of thermosensitive metronidazol by spray freeze-drying

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...

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Research paper thumbnail of Alkaline Salt Tolerance of the Biomass Plant Arundo donax

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,...

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Research paper thumbnail of 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.

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Research paper thumbnail of CCDC 1865734: Experimental Crystal Structure Determination

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Research paper thumbnail of CCDC 1865733: Experimental Crystal Structure Determination

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Research paper thumbnail of CCDC 1865731: Experimental Crystal Structure Determination

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Research paper thumbnail of Magnesium Supplementation and Microelement Homeostasis

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 ...

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Research paper thumbnail of Perspectives of magnetic and nanosized metal-containing amorphous carbon composite chemosorbents and catalysts

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Microelements in Drug and Extracts of Plantago Lanceolata L

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...

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Research paper thumbnail of Elemental composition of wild growing Agaricus campestris mushroom in urban and peri-urban regions of Transylvania (Romania)

Journal of Food Composition and Analysis, 2018

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Research paper thumbnail of Direct immobilization of manganese chelates on silica nanospheres for MRI applications

Journal of Colloid and Interface Science, 2017

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Research paper thumbnail of 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.

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Research paper thumbnail of Mineral phases containing heavy metals in the suspended dust from Budapest, Hungary

E3S Web of Conferences, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Element intake in patients with inflammatory bowel diseases

Zeitschrift für Gastroenterologie, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Mössbauer study on iron-polygalacturonate coordination compounds

Hyperfine Interactions, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Halochromic Behavior and Anticancer Effect of New Synthetic Anthocyanidins Complexed with β-Cyclodextrin Derivatives

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...

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