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Search Results: 1 - 10 of 325 matches for " Alena Vollmannová "
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DETERMINATION OF FLAVONOIDS CONTENT IN COLOURED PEAS (PISUM SATIVUM L.) IN RELATION TO CULTIVAR’S DEPENDENCE AND STORAGE DURATION UNDER NATURAL CONDITIONS
Mária Timoracká,Alena Vollmannová
Potravinarstvo : Scientific Journal for Food Industry , 2010, DOI: 10.5219/70
Abstract: Our attention is being given especially to four representative flavonoids: kaempherol, apigenin, genistein and daidzein. These flavonoids were studied in the seeds of colored varieties of dry pea. Isocratic HPLC analysis with DAD detection after acid hydrolysis of samples was performed. The differences of flavonoid contents in individual pea varieties were not significant. The determined values of flavonoids in green peas were: daidzein 1,746-2,688 mg.kg-1, genistein 0,412-0,706 mg.kg-1, kaempherol 0,621-1,484 mg.kg-1, apigenin 0,261-0,479 mg.kg-1. Yellow varieties of pea contained between 0,375-0,779 mg.kg-1 daidzein, 0,115-0,158 mg.kg-1 genistein, kaempherol 0,742-1,314 mg.kg-1, apigenin 0,462-0,698 mg.kg-1. Also the changes in content of chosen flavonoids in pea in the dependence on variety in dried legumes stored under natural conditions were surveyed. From the results it came out that in interval 7 month the content of all observed flavonoids declined in dry material (in some cases even to non-detectable levels). doi:10.5219/70
INPUT OF CADMIUM FROM SOIL INTO LENTIL AND FABABEAN SEEDS
Mária Timoracká,Alena Vollmannová,Dalaram Ismael
Potravinarstvo : Scientific Journal for Food Industry , 2012, DOI: 10.5219/208
Abstract: In the plant, the polyphenols create in the defense mechanism against stress conditions, such as heavy metals. In view of the above aspects, therefore we will work focused on monitoring the influence of accumulation of cadmium on the formation of polyphenols in lentil and faba bean in a model vegetation conditions, in which have been deliberately added dose of Cd with 5,10,15 multiple as the limit value claimed by the limits of the Law no. 220/2004 Z.z. to assess the state of soil contamination. In all scenarios exceed the maximum permitted levels for Food Codex SR for cadmium in grains of both crops. Influence of soil contamination on the content of polyphenols was significantly confirmed, although the content of polyphenols in some variants show some tendency with increasing dose of heavy metal, but results both indicate that the formation of polyphenols (as response to stress) is probably genetically determined. doi:10.5219/208
MINERALS, TRACE ELEMENTS AND FLAVONOIDS CONTENT IN WHITE AND COLOURED KIDNEY BEAN
Mária Timoracká,Alena Vollmannová,Dalaram Ismael
Potravinarstvo : Scientific Journal for Food Industry , 2011, DOI: 10.5219/116
Abstract: The aim of the study was to determine the contents of mineral elements (Ca, K, Mg, N, P), trace elements (Cu, Fe, Mn, Cd, Pb, Ni, Co, Cr, and Zn), and certain phenolic compounds (flavonoids, isoflavones) in the fourteen varieties of cultivated raw kidney beans (Phaseolus vulgaris L.).Heavy metals and mineral elements were analyzed by AAS methods, phenolics were detected by HPLC. Compared with vegetables, legumes proved to be a good source of many minerals and elements, e.g., the contents of K, Mg, P, Fe, and Zn varied in the ranges 13.02 - 23.08 g.kg-1, 1.41 - 2.52 g.kg-
POLYPHENOLS IN CHOSEN SPECIES OF LEGUME - A REVIEW
Mária Timoracká,Alena Vollmannová,Judita Bystrická
Potravinarstvo : Scientific Journal for Food Industry , 2010, DOI: 10.5219/81
Abstract: Legumes belongs to the most important grain for human consumption. They have been cultivated for thousands of years, and have played an important role in the traditional diets of many regions throughout the world. The most legumes are widely consumed in fresh and processed forms. The traditional way of legume preparation includes soaking in water following by cooking and are usually consumed boiled as soup, occasionally as roasted grains too. Legume are widely known for their nutraceutical value, but there is relatively little information about their polyphenols content (with the exception of soya). Inspite of the fact that phenolics in general are not the substances with nutritious value, the interest in them is still persisting for their positive effects on human health. For these reasons this short review is focused on summary of legume polyphenols – identification and quantification of phenolic acids, flavonoids and tannins in raw or processed legumes and their role in these crops. Monitoring and surveying of the changes of polyphenolic compounds contents thus complete knowledge about bioactive substances content in legumes species. And seeing that legumes are considered an ideal complement to cereals in diets, they gain increasing attention as functional food items. doi:10.5219/81
Contamination of potato tubers by heavy metals and their influence on the formation of phenolic substances
Janette MUSILOVá,Judita Bystrická,Alena Vollmannová,,Silvia Melichá?ová
Journal of Central European Agriculture , 2011, DOI: 10.5513/jcea01/12.3.936
Abstract: Increased content of cadmium and lead in soil was manifested by their increased concentration in potato tubers in such range that contents were several times higher (Cd 0.106-0.357, Pb 0.318-0.483 mg.kg-1 FM) then the limit value. Increased content of zinc was not manifested by increased content in tubers of potatoes (Zn 4.939- 6.868 mg.kg-1 FM). Content of total phenolics (TP) in potato samples of Hontiansky and Bansko tiavnicky region was in the range of 263.59-920.38 mg.kg-1 of dry material. Exceeded content of cadmium and lead in potato tubers had statistically significant effect on total phenol producing, but on the other hand relation between contents of Zn and TP in potato tubers was not statistically confirmed. Also positive correlation between TP and antioxidant activity contents was statistically confirmed.
INFLUENCE OF ADDITION OF OAT AND LENTIL ON THE CONTENT OF THE DETECTED COMPONENTS IN BREAD
Tatiana Bojňanská,Alena Vollmannová,Helena Fran?áková
Potravinarstvo : Scientific Journal for Food Industry , 2010, DOI: 10.5219/42
Abstract: In this paper, the results obtained by bread products analysis made with the addition of oats and lentils, which increased its nutrition value are presented. Breads were prepared with addition of 10 %, 20 %, 30 %, 40 % and 50 % which were analyzed for Fe, Mn, Zn, Cu, Co, Ni, Cr, Pb and Cd content. Prepared products were evaluated also from viewpoint of their technological and nutritional value. Use of oat in bread increased with the addition of a quantity of 50 % content of nutritionally significant elements such as Fe (3.2 times), Mn (3.13 times), Zn (2.23 times), Cu (2.01 times) and Cr (1.2 times). The addition of lentils increased particularly Cu content (3.55 times), Zn (2.96 times) and Mn (1.29 times). None of the samples showed exceeded maximum limit (1.0 mg.kg-1) for lead. Based on the analysis results it was confirmed, that the most problematic element in our soils and subsequently in the foodstuffs is cadmium. Exceeded values (< 0.1 mg.kg-1) were detected in 8 samples from 11, in finished products the values were within the limits ranging from 0.090 mg.kg-1 Cd to 0.180 mg.kg-1 Cd.
HEAVY METALS IN MIDDLE NITRA RIVERSIDE
Radovan Stanovi?,Július árvay,Alena Vollmannová,Silvia ?éryová
Journal of Microbiology, Biotechnology and Food Sciences , 2012, DOI: 13385178
Abstract: Present state of environment is widely affected by various impacts of man which significantly eliminate negative affecting of its influence on the environment. In the past this fact was not so implemented and thus there was uncontrolled escape of contaminants of organic, but also inorganic origin into various components of environment. The most sensitive component is water ecosystem and its close plates (base sediments, banks sediments and biosphere near the flows). River Nitra ranks among the most affected water ecosystems in SR that was in 1965 the recipient of sludge, that was by accident in Zemianske Kosto any uncontrolled spilled into the river with aftermath of long-term contamination of all sub-components in ecosystem, mainly by heavy metals (Hg, As, Pb, etc.). Soil contamination by Cd and Hg was analytically confirmed. The contents of these risk elements in soil extract of aqua regia 1.85 - 3.7 fold (Cd) and 4.57- 36.3 fold (Hg) exceeded the limit values (0.4 mg.kg-1 and 0.15 mg.kg-1 respectively) given by the legislative. Other metals exceeding limit values were lead (1.064 - 1.072 fold), zinc (1.096 - 1.192 fold) and chromium (1.172 – 1.644 fold). From assessed soil content of heavy metals only bioavailable forms of Pb determined in soil extract by NH4NO3 2.0 - 3.3 fold exceeded the limit value 0.1 mg.kg-1.
Relation of total antiradical activity and total polyphenol content of sweet cherries (Prunus avium L.) and tart cherries (Prunus cerasus L.)
Silvia Melichá ová, Mária Timoracká, Judita Bystrická, Alena Vollmannová, Juraj éry
Acta agriculturae Slovenica , 2010, DOI: 10.2478/v10014-010-0003-3
Abstract: In present study the quantification of total phenolics content (TPC), total antioxidant activity (TAA) and their relation in sweet and tart cherries were studied. Aqueous and pure polar solvents were used to compare the yield of present phenolic compounds in prepared extracts. The solubility of phenolics was the most effective in sweet cherry extracts with using of 50 % methanol and in tart cherry extracts with using of 50 % acetone. The yield of TPC of both tested cherry fruit extracts was higher with pure methanol in comparison to pure acetone. Substantial TPC assessed with Folin-Ciocealteu assay in tart cherry extracts were in range from 70.6±8.46 mg to 241.4±7.26 mg GAE/100 g FW. Extracts from lyophilised tart cherries (methanolic and water-acetone mixtures) contain in average 2-times higher amount of polyphenols than ethanol extracts. The DPPH antiradical efficiency values of the both tested fruit extracts were higher in extracts of tart cherries (from 5.4 to 9.9 % of inhibition of DPPH radical) when compared to those of sweet cherries (from 2.4 to 3.5 % of inhibition of DPPH radical). Total antioxidant activity (TAA) of sweet cherry extracts (using 70 % ethanol and with 70 % methanol) and of tart cherry extracts (with 50 % methanol) depended on phenolics content.
CAN BE BLUEBERRIES THE RISK FOOD AND RAW MATERIAL?
Lívia Krí?ová,Alena Vollmannová,Eva Margitanová,Ján Daniel
Journal of Microbiology, Biotechnology and Food Sciences , 2012, DOI: 13385178
Abstract: Fruits of the highbush blueberries are popular for their beneficial effects on human health and for their excellent sweet-vine taste. Our work is focused on risk assessment of selected elements in relation to the content of bioactive compounds in wild and cultivated of highbush blueberries (Vaccinium corymbosum L.). Anthocyanins are polyphenols that are widely distributed in plants, and contribute to the brilliant blue, red or purple colour in leaves, owers or fruits. In the samples the antioxidant capacity by the method of Brand – Williams using DPPH (2,2–difenyl-1-pikrylhydrazyl) and the content of anthocyanins by the modified method Lapornik in two samples of wild blueberries from different areas of Slovakia ( ertovica and Oravské Veselé) and in 6 cultivated varieties highbush blueberry (Bluejay, Bluecrop, Patriot, Berkeley, Brigitta, Nelson) were determined. The contents of risky elements - Cd, Pb were assessed by AAS method. The contents of Pb were in all observed samples higher than the maximum limit given by the legislation (cultivated: 0.5612 – 0.9912 mg.kg-1, wild: 0.792 – 0.874 mg.kg-1). The measured content values of Cd were in all samples of blueberries lower than hygienic limit. The highest content of anthocyanins from analysed samples was in wild blueberries from surrouding ertovica 4870.125 ± 22.803 mg.dm-3, but in this sample was simultaneously the lowest antioxidant capacity of 61.15 ± 1.002 %. The highest antioxidant capacity was measured in sample of cultivated variety Bluejay 87.175 ± 0.45 %. It is important to carry out monitoring of heavy metals to consumption of safe food raw materials and foodstuffs.
INFLUENCE OF VARIETY, LOCALITY AND SOIL CONTAMINATION ON TOTAL POLYPHENOL CONTENT AND ANTIOXIDANT ACTIVITY OF FABABEAN GRAINS
Dalaram S. Ismael,Mária Timoracká,Alena Vollmannová,Július árvay
Journal of Microbiology, Biotechnology and Food Sciences , 2012, DOI: 13385178
Abstract: Polyphenolic compounds are secondary metabolites present in many plant species, including legumes. Their content depends on various factors, such as cultivar, pedo-climatic and cultivation conditions. The influence of cultivar, locality and soil contamination on the total polyphenols and antioxidant activity of fababean was studied. Fababean cultivars were cultivated under different climatic conditions in Iraq and Slovak Republic. The value of polyphenol content was in the range 1583.54 - 3374.91 mg.kg-1 and their antioxidant activity from 16.62 - 38.40 % of DPPH inhibition. The locality and variety were significant factors in explaining differences between the total polyphenols values in fababean. In fababean (cv. Saturn, Zobor) grown under model conditions of vegetation pot trial using the soil ( akajovce locality, Slovakia) with graduated loading by Zn, the influence of soil contamination on TP content and AOA was not confirmed, only the correlation between cumulated Zn content and TAC in cv. Zobor (at the highest contamination) was strongly negative (r= -0,99).
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