Andreea Georgescu - Academia.edu (original) (raw)
Papers by Andreea Georgescu
The capacities of <i>Pleurotus ostreatus</i> mushroom and spent substrate were evalua... more The capacities of <i>Pleurotus ostreatus</i> mushroom and spent substrate were evaluated for the biosorption of cadmium (II) from aqueous solution in order to select the most efficient material for bioremediation. The optimum sorption conditions were optimized, including the pH of the aqueous solution, contact time, biomass dosage, initial metal concentration, and temperature. The sorption of cadmium on both biosorbents was also evaluated by several kinetic, equilibrium, and thermodynamic models. The possible heavy metal biosorption mechanisms were evaluated through point of zero charge (pH<sub>pzc</sub>), Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray microanalysis (SEM-EDX). Based on the results of column studies, the effectiveness of the <i>P. ostreatus</i> spent substrate was confirmed as a biosorbent for Cd(II) removal from aqueous solutions.
It was necessary to identify the metals (heavy, noble and rare metals) bioabsorption characterist... more It was necessary to identify the metals (heavy, noble and rare metals) bioabsorption characteristics to the edible mushroom species Armillaria melea, in the view to relieve its quality as indicator. The samples were collected from some forestry ecosystems: Adanca, Gorgota, Manesti, Bucegi-Paduchiosu and Dambovita River vally from Dambovita County. All over the world today are developing large studies concerning biochemical and physiological features of mushrooms in the view to promote them as biological tools in different types of environmental biotechnologies grace of their bioabsorption capacity for heavy, rare or noble metals. This paper is about the elemental content of Armillaria melea in cap and stipe, bioabsorption factor, correlated to the mineral content of substrate and its natural pH value. The elemental content of biological and environmental samples was determined by spectrometry of fluorescence (EDXRF) using ELVA_X apparatus. Biological samples and their substrate samp...
Valahia University of Targoviste, Faculty of Environmental Engineering and Food Science, 130004 T... more Valahia University of Targoviste, Faculty of Environmental Engineering and Food Science, 130004 Targoviste, Romania E-mail: antonia.georgescu@gmail.com 2 University of Bucharest, Faculty of Chemistry, 050657 Bucharest, Romania Valahia University of Targoviste, Faculty of Sciences and Arts, 130024 Targoviste, Romania Valahia University of Targoviste, Multidisciplinary Research Institute for Sciences and Technologies, 130004 Targoviste, Romania Horia Hulubei Institute of Physics and Nuclear Engineering, 077125 Magurele, Romania University of Bucharest, Doctoral School in Chemistry, 050657, Bucharest, Romania Corresponding author: Cristiana Radulescu E-mail: radulescucristiana@yahoo.com
Revista de Chimie
Prunus cerasifera Ehrh. fruits, as well as other stone fruits, have a number of features which ma... more Prunus cerasifera Ehrh. fruits, as well as other stone fruits, have a number of features which make can be used: fresh consumption, in canned food industry and for the manufacture of brandy. In this paper, some fruits of Prunus cerasifera Ehrh. biotypes found in Fruit -Growing Area Voine�ti were biochemically analyzed (parameters were: soluble dry matter, vitamin C, titratable acidity expressed in malic acid). The research was carried out over two consecutive years, 2013 and 2014 and 14 biotypes were analyzed: yellow wax cherry 9 and 5 red wax cherry harvested from the area Voinesti (Dambovita).
Analytical Letters
Abstract The potential of Pleurotus ostreatus mushroom and its spent substrate were investigated ... more Abstract The potential of Pleurotus ostreatus mushroom and its spent substrate were investigated for the biosorption of lead (II) from aqueous solutions in both batch and dynamic experiments. After evaluation and optimization of the Pb(II) sorption parameters, the Pleurotus ostreatus spent substrate (POBM) showed a greater adsorption capacity (85.91 mg/g) compared to the original spores of Pleurotus ostreatus (PO) (57.73 mg/g). Biosorption equilibrium, kinetic and thermodynamic models were applied to investigate the mechanism of lead sorption on both of the biosorbents. In order to achieve a more complete characterization, scanning electron microscopy – energy dispersive X-ray spectroscopy (SEM-EDX), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis were also performed. The Pleurotus ostreatus spent substrate biomass was used to remove Pb(II) from aqueous solution by the use of a fixed-bed column. The breakthrough curves at two concentrations equal to 50 and 100 mg/L were determined and analyzed using the Thomas and Yoon-Nelson theoretical models. The reusability properties of the biosorbents were determined using five cycles of adsorption and desorption. The applicability of the mushroom spent substrate as a biosorbent for Pb(II) removal from real wastewater was characterized in a continuous system in which 1 g of biomass allowed the purification of 2.4 L of lead contaminated water with 93% metal removal efficiency, confirming the suitability of this approach for large-scale applications.
Revista de Chimie
Ten edible mushroom species collected from four sites of Dambovita County, Romania, were analyzed... more Ten edible mushroom species collected from four sites of Dambovita County, Romania, were analyzed through ICP-MS technique in order to evaluate their content in Fe, Cu, Zn, Pb and Cd, both in cap and stipe. Wild growing species (Russula vesca, Russula alutacea, Macrolepiota procera, Cantharellus cibarius, Boletus edulis, Agaricus campestris and Pleurotus ostreatus) and cultivated species (Pleurotus ostreatus, Agaricus bisporus white and Agaricus bisporus brown) were taken into account. The data related to the elemental composition of the fruiting bodies of mushrooms are important to be known having in view the nutritional and food safety related aspects. Higher concentrations of copper, iron and zinc have been found in Pleurotus ostreatus (cap), Macrolepiota procera (stipe) and Pleurotus ostreatus cultivated (cap) respectively, as follows: 43.90�0.96 mg/g d.w., 715.15�4.52 mg/g d.w. and 379.33�2.05 mg/g d.w. Although significant Health Risk Index were determined for lead in Agaricus...
Food Engineering [Working Title]
Characterization of several wild growing and cultivated mushrooms from geographical area of Dambo... more Characterization of several wild growing and cultivated mushrooms from geographical area of Dambovita County, Romania, in terms of enzymatic and non-enzymatic antioxidants, through a chemometrics approach, was the aim of this study. Related to the authors' previous studies, the novelty of this paper consists in deepening research toward the complete characterization of the regional mushroom species through emphasizing their potential as food resources. In the context in which species showed their content in biological active compounds, future practical applications in the area of functional food will be developed by integrating the data concerning their lack of the toxicity and nutritional value too. Lack of data focused on the characterization of mushroom species investigated in the paper supports the significance of this research. The statistical analysis of data highlights the relationship between compounds showing antioxidant activity of autochthonous mushrooms (both cap and stipe).
Analytical Letters
Abstract The capacities of Pleurotus ostreatus mushroom and spent substrate were evaluated for th... more Abstract The capacities of Pleurotus ostreatus mushroom and spent substrate were evaluated for the biosorption of cadmium (II) from aqueous solution in order to select the most efficient material for bioremediation. The optimum sorption conditions were optimized, including the pH of the aqueous solution, contact time, biomass dosage, initial metal concentration, and temperature. The sorption of cadmium on both biosorbents was also evaluated by several kinetic, equilibrium, and thermodynamic models. The possible heavy metal biosorption mechanisms were evaluated through point of zero charge (pHpzc), Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray microanalysis (SEM-EDX). Based on the results of column studies, the effectiveness of the P. ostreatus spent substrate was confirmed as a biosorbent for Cd(II) removal from aqueous solutions.
Analytical Letters
Abstract The elemental composition and antioxidant activity have been obtained for regional mushr... more Abstract The elemental composition and antioxidant activity have been obtained for regional mushrooms species, wild and cultivated, from Dambovita County, Romania. A multivariate approach and data mining techniques (principal component analysis and cluster analysis, respectively) were applied in order to evaluate the correlation matrix for these parameters for both caps and stipes of mushrooms. The associations between metallic elements (i.e., Fe, Cu, Cd, Pb, Co, Ni, Zn, Mn, Cr, Na, K, Ca and Mg) correlated with antioxidant activity, total phenolics, and total flavonoids were carried out by using a full factorial linear design. The multivariate functional analysis revealed on associated accumulation of several elements in mushrooms. In the cluster analysis, the dataset was treated to appreciate the correlation between metals group (e.g., heavy metals, such as Fe, Cu, Cd, Pb, Co, Ni, Zn, Mn, Cr, and important nutritional elements, such as Na, K, Ca, and Mg). Fungal species with similar characteristics in terms of metal accumulation formed two distinctive clusters. From a point of view of the consumer, the content of Cd and especially Pb in the fruiting bodies of the analyzed mushrooms species may be considered elevated, so that mapping the risk is compulsory. Applying the chemometric tools in the sense mentioned above, as well as in helping the scientific research by optimizing the number of data points, was shown to be extremely useful.
The heavy metals (Zn, Fe) content of some wild mushrooms (Amanita caesarea, Rusulla virescens, Ru... more The heavy metals (Zn, Fe) content of some wild mushrooms (Amanita caesarea, Rusulla virescens, Rusulla cyanoxantha, Rusulla vesca, Rusulla alutacea, Rusulla foetens, Lepiota procera, Lepiota excoriata, Armillaria mellea, Cantharellus cibarius, Boletus edulis, Pleurotus ostreatus, Hydnum repandum, Lactarius piperatus, Lactarius vellereus) of four sites from Dambovita county Romania, were analyzed. Elements concentrations were determined by Energy Dispersive X-ray Fluorescence spectrometry (EDXRF). In fruiting body of these mushrooms, the highest mean concentration of macroelements was found for Zn and Fe. Hydnum repandum species accumulated zinc at a level three times higher than average concentration of species of fungi studied, 248 mg/kg and Cantharellus cibarius species concentrate the metal values of two times higher than average concentration. Rusulla cyanoxantha species concentration values of iron is four times higher, respectively Chantarellus cibarius, Lactarius piperatus sp...
The capacities of <i>Pleurotus ostreatus</i> mushroom and spent substrate were evalua... more The capacities of <i>Pleurotus ostreatus</i> mushroom and spent substrate were evaluated for the biosorption of cadmium (II) from aqueous solution in order to select the most efficient material for bioremediation. The optimum sorption conditions were optimized, including the pH of the aqueous solution, contact time, biomass dosage, initial metal concentration, and temperature. The sorption of cadmium on both biosorbents was also evaluated by several kinetic, equilibrium, and thermodynamic models. The possible heavy metal biosorption mechanisms were evaluated through point of zero charge (pH<sub>pzc</sub>), Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray microanalysis (SEM-EDX). Based on the results of column studies, the effectiveness of the <i>P. ostreatus</i> spent substrate was confirmed as a biosorbent for Cd(II) removal from aqueous solutions.
It was necessary to identify the metals (heavy, noble and rare metals) bioabsorption characterist... more It was necessary to identify the metals (heavy, noble and rare metals) bioabsorption characteristics to the edible mushroom species Armillaria melea, in the view to relieve its quality as indicator. The samples were collected from some forestry ecosystems: Adanca, Gorgota, Manesti, Bucegi-Paduchiosu and Dambovita River vally from Dambovita County. All over the world today are developing large studies concerning biochemical and physiological features of mushrooms in the view to promote them as biological tools in different types of environmental biotechnologies grace of their bioabsorption capacity for heavy, rare or noble metals. This paper is about the elemental content of Armillaria melea in cap and stipe, bioabsorption factor, correlated to the mineral content of substrate and its natural pH value. The elemental content of biological and environmental samples was determined by spectrometry of fluorescence (EDXRF) using ELVA_X apparatus. Biological samples and their substrate samp...
Valahia University of Targoviste, Faculty of Environmental Engineering and Food Science, 130004 T... more Valahia University of Targoviste, Faculty of Environmental Engineering and Food Science, 130004 Targoviste, Romania E-mail: antonia.georgescu@gmail.com 2 University of Bucharest, Faculty of Chemistry, 050657 Bucharest, Romania Valahia University of Targoviste, Faculty of Sciences and Arts, 130024 Targoviste, Romania Valahia University of Targoviste, Multidisciplinary Research Institute for Sciences and Technologies, 130004 Targoviste, Romania Horia Hulubei Institute of Physics and Nuclear Engineering, 077125 Magurele, Romania University of Bucharest, Doctoral School in Chemistry, 050657, Bucharest, Romania Corresponding author: Cristiana Radulescu E-mail: radulescucristiana@yahoo.com
Revista de Chimie
Prunus cerasifera Ehrh. fruits, as well as other stone fruits, have a number of features which ma... more Prunus cerasifera Ehrh. fruits, as well as other stone fruits, have a number of features which make can be used: fresh consumption, in canned food industry and for the manufacture of brandy. In this paper, some fruits of Prunus cerasifera Ehrh. biotypes found in Fruit -Growing Area Voine�ti were biochemically analyzed (parameters were: soluble dry matter, vitamin C, titratable acidity expressed in malic acid). The research was carried out over two consecutive years, 2013 and 2014 and 14 biotypes were analyzed: yellow wax cherry 9 and 5 red wax cherry harvested from the area Voinesti (Dambovita).
Analytical Letters
Abstract The potential of Pleurotus ostreatus mushroom and its spent substrate were investigated ... more Abstract The potential of Pleurotus ostreatus mushroom and its spent substrate were investigated for the biosorption of lead (II) from aqueous solutions in both batch and dynamic experiments. After evaluation and optimization of the Pb(II) sorption parameters, the Pleurotus ostreatus spent substrate (POBM) showed a greater adsorption capacity (85.91 mg/g) compared to the original spores of Pleurotus ostreatus (PO) (57.73 mg/g). Biosorption equilibrium, kinetic and thermodynamic models were applied to investigate the mechanism of lead sorption on both of the biosorbents. In order to achieve a more complete characterization, scanning electron microscopy – energy dispersive X-ray spectroscopy (SEM-EDX), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis were also performed. The Pleurotus ostreatus spent substrate biomass was used to remove Pb(II) from aqueous solution by the use of a fixed-bed column. The breakthrough curves at two concentrations equal to 50 and 100 mg/L were determined and analyzed using the Thomas and Yoon-Nelson theoretical models. The reusability properties of the biosorbents were determined using five cycles of adsorption and desorption. The applicability of the mushroom spent substrate as a biosorbent for Pb(II) removal from real wastewater was characterized in a continuous system in which 1 g of biomass allowed the purification of 2.4 L of lead contaminated water with 93% metal removal efficiency, confirming the suitability of this approach for large-scale applications.
Revista de Chimie
Ten edible mushroom species collected from four sites of Dambovita County, Romania, were analyzed... more Ten edible mushroom species collected from four sites of Dambovita County, Romania, were analyzed through ICP-MS technique in order to evaluate their content in Fe, Cu, Zn, Pb and Cd, both in cap and stipe. Wild growing species (Russula vesca, Russula alutacea, Macrolepiota procera, Cantharellus cibarius, Boletus edulis, Agaricus campestris and Pleurotus ostreatus) and cultivated species (Pleurotus ostreatus, Agaricus bisporus white and Agaricus bisporus brown) were taken into account. The data related to the elemental composition of the fruiting bodies of mushrooms are important to be known having in view the nutritional and food safety related aspects. Higher concentrations of copper, iron and zinc have been found in Pleurotus ostreatus (cap), Macrolepiota procera (stipe) and Pleurotus ostreatus cultivated (cap) respectively, as follows: 43.90�0.96 mg/g d.w., 715.15�4.52 mg/g d.w. and 379.33�2.05 mg/g d.w. Although significant Health Risk Index were determined for lead in Agaricus...
Food Engineering [Working Title]
Characterization of several wild growing and cultivated mushrooms from geographical area of Dambo... more Characterization of several wild growing and cultivated mushrooms from geographical area of Dambovita County, Romania, in terms of enzymatic and non-enzymatic antioxidants, through a chemometrics approach, was the aim of this study. Related to the authors' previous studies, the novelty of this paper consists in deepening research toward the complete characterization of the regional mushroom species through emphasizing their potential as food resources. In the context in which species showed their content in biological active compounds, future practical applications in the area of functional food will be developed by integrating the data concerning their lack of the toxicity and nutritional value too. Lack of data focused on the characterization of mushroom species investigated in the paper supports the significance of this research. The statistical analysis of data highlights the relationship between compounds showing antioxidant activity of autochthonous mushrooms (both cap and stipe).
Analytical Letters
Abstract The capacities of Pleurotus ostreatus mushroom and spent substrate were evaluated for th... more Abstract The capacities of Pleurotus ostreatus mushroom and spent substrate were evaluated for the biosorption of cadmium (II) from aqueous solution in order to select the most efficient material for bioremediation. The optimum sorption conditions were optimized, including the pH of the aqueous solution, contact time, biomass dosage, initial metal concentration, and temperature. The sorption of cadmium on both biosorbents was also evaluated by several kinetic, equilibrium, and thermodynamic models. The possible heavy metal biosorption mechanisms were evaluated through point of zero charge (pHpzc), Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray microanalysis (SEM-EDX). Based on the results of column studies, the effectiveness of the P. ostreatus spent substrate was confirmed as a biosorbent for Cd(II) removal from aqueous solutions.
Analytical Letters
Abstract The elemental composition and antioxidant activity have been obtained for regional mushr... more Abstract The elemental composition and antioxidant activity have been obtained for regional mushrooms species, wild and cultivated, from Dambovita County, Romania. A multivariate approach and data mining techniques (principal component analysis and cluster analysis, respectively) were applied in order to evaluate the correlation matrix for these parameters for both caps and stipes of mushrooms. The associations between metallic elements (i.e., Fe, Cu, Cd, Pb, Co, Ni, Zn, Mn, Cr, Na, K, Ca and Mg) correlated with antioxidant activity, total phenolics, and total flavonoids were carried out by using a full factorial linear design. The multivariate functional analysis revealed on associated accumulation of several elements in mushrooms. In the cluster analysis, the dataset was treated to appreciate the correlation between metals group (e.g., heavy metals, such as Fe, Cu, Cd, Pb, Co, Ni, Zn, Mn, Cr, and important nutritional elements, such as Na, K, Ca, and Mg). Fungal species with similar characteristics in terms of metal accumulation formed two distinctive clusters. From a point of view of the consumer, the content of Cd and especially Pb in the fruiting bodies of the analyzed mushrooms species may be considered elevated, so that mapping the risk is compulsory. Applying the chemometric tools in the sense mentioned above, as well as in helping the scientific research by optimizing the number of data points, was shown to be extremely useful.
The heavy metals (Zn, Fe) content of some wild mushrooms (Amanita caesarea, Rusulla virescens, Ru... more The heavy metals (Zn, Fe) content of some wild mushrooms (Amanita caesarea, Rusulla virescens, Rusulla cyanoxantha, Rusulla vesca, Rusulla alutacea, Rusulla foetens, Lepiota procera, Lepiota excoriata, Armillaria mellea, Cantharellus cibarius, Boletus edulis, Pleurotus ostreatus, Hydnum repandum, Lactarius piperatus, Lactarius vellereus) of four sites from Dambovita county Romania, were analyzed. Elements concentrations were determined by Energy Dispersive X-ray Fluorescence spectrometry (EDXRF). In fruiting body of these mushrooms, the highest mean concentration of macroelements was found for Zn and Fe. Hydnum repandum species accumulated zinc at a level three times higher than average concentration of species of fungi studied, 248 mg/kg and Cantharellus cibarius species concentrate the metal values of two times higher than average concentration. Rusulla cyanoxantha species concentration values of iron is four times higher, respectively Chantarellus cibarius, Lactarius piperatus sp...