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Your search keyword '"Janda, Katarzyna"' showing total 274 results
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274 results on '"Janda, Katarzyna"'

3. Effect of the Yerba mate (Ilex paraguariensis) brewing method on the content of selected elements and antioxidant potential of infusions

Author

Janda Katarzyna, Jakubczyk Karolina, Łukomska Agnieszka, Baranowska-Bosiacka Irena, Rębacz-Maron Ewa, Dec Karolina, Kochman Joanna, and Gutowska Izabela

Subjects
yerba, antioxidant activity, infusions, minerals, Chemistry, QD1-999
Abstract

Yerba mate is a source of biologically active substances. The aim was to determine whether the place of origin of Yerba and the brewing method have any influence on the levels of Ca, Mg and Fe and antioxidant activity of infusions. Samples were steeped in cold water (25°C) and hot water (three consecutive infusions with 85°C water). Infusions had a high antioxidant activity and high Mg level. The levels of elements and the antioxidant activity were influenced by the brewing method. There were no significant differences in the examined parameters depending on the country of origin. The results on the levels of elements and the antioxidant activity indicate that the most efficient brewing method was infusion in hot water. The highest levels of elements were found in first infusions, with the highest antioxidant activity in the third infusions.

Published
2020
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5. Effect of extraction method on the antioxidative activity of ground elder (Aegopodium podagraria L.)

Author

Wróblewska Agnieszka, Janda Katarzyna, Makuch Edyta, Walasek Marika, Miądlicki Piotr, and Jakubczyk Karolina

Subjects
ground elder, methods of extractions, antioxidant activity, dpph radical, Chemistry, QD1-999
Abstract

In this work the studies on the antioxidative properties of extracts from various morphotic parts of the ground elder (leaves, rhizomes, seeds and flowers) were presented. Moreover, the effect of different extraction methods (ultrasonic assisted extractions, extraction in a Soxhlet apparatus, extraction at the boiling point of the solvent used), solvent and its amount, and extraction time on the antioxidative properties of the obtained extracts were tested. The studies showed that all parts of ground elder can show radical scavenging activity, and it depends mainly on the method of extraction and extraction time. But the most beneficial is ultrasonic assisted extraction which used lower amount of solvent (ethanol). In case of all parts of the ground elder (leaves, rhizomes, seeds and flowers) it allows to obtain very high values of the antioxidant capacity (above 90%) for very short extraction time amounted to 20–40 minutes.

Published
2019
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9. Antioxidant Potential of Curcumin—A Meta-Analysis of Randomized Clinical Trials

Author

Karolina Jakubczyk, Aleksandra Drużga, Janda Katarzyna, and Karolina Skonieczna-Żydecka

Subjects
curcumin, polyphenol, antioxidant, oxidative stress, turmeric, Indian saffron, Therapeutics. Pharmacology, RM1-950
Abstract

Background: Antioxidant potential is defined as the ability to neutralize oxygen free radicals that are generated in excess due to environmental influences. The body’s defense mechanisms often require support in preventing the effects of oxidative stress. The literature data suggest that curcumin has antioxidant activity that can significantly reduce oxidative stress levels. The aim was to assess the impact of curcumin on oxidative stress markers. Methods: PubMed and Embase were searched from database inception until 27 September 2019 for randomized clinical trials in >20 patients treated with curcumin supplements and randomized to placebo/no intervention/physical activity to verify the antioxidant potential of curcumin. Results: Four studies were included in the meta-analysis, three of which were double-blind and one single-blind. A total of 308 participants took part in the research. A total of 40% of the respondents were men. The average age of participants was 27.60 ± 3.79 years. The average supplementation time was 67 days and the average dose of curcumin administered was 645 mg/24 h. Curcumin significantly increased total antioxidant capacity (TAC) (SMD = 2.696, Z = 2.003, CI = 95%, p = 0.045) and had a tendency to decrease malondialdehyde (MDA) concentration (SMD = −1.579, Z = −1.714, CI = 95%, p = 0.086). Conclusions: Pure curcumin has the potential to reduce MDA concentration and increase total antioxidant capacity.

Published
2020
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10. Relationships Between Fungal Contamination and Some Physicochemical Properties of Rapeseeds

Author

Janda Katarzyna and Markowska-Szczupak Agata

Subjects
rapeseed, quality of seeds, amount of fungi, correlations, Ecology, QH540-549.5
Abstract

The aim of this study was to evaluate some properties of rapeseed, to determine the amount of fungi including thermotolerant and xerophilic species and to specify the correlations between some physical properties of rapeseed and the number of fungi. Material was 18 samples of rapeseeds. The characteristics of seeds included volumetric weight, impurities, pH, moisture, water activity, fat content, fat acidity and critical moisture of seeds. Number of fungi were investigated on RBA, YpSs, DG18 medium at 25, 37 and 45°C. Differences between amount of rapeseed impurities and fat acidity have been revealed. The number of fungi was diversified depending on medium and incubation temperature. The largest fungi number was isolated on DG18 at 25°C. Correlations between physicochemical properties of seeds and number of isolated fungi have been pointed out. Our study demonstrated that low pH values and weight by volume of seeds as well as high acidity of fat can be used as indicators of contamination of rapeseeds by fungi.

Published
2015
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11. LEGISLATION

Author

Falkiewicz-Dulik, Michalina, primary, Janda, Katarzyna, additional, and Wypych, George, additional

Published
2015
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22. INTRODUCTION

Author

Falkiewicz-Dulik, Michalina, primary, Janda, Katarzyna, additional, and Wypych, George, additional

Published
2015
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42. The Effect of Probiotics and Synbiotics on Risk Factors Associated with Cardiometabolic Diseases in Healthy People—A Systematic Review and Meta-Analysis with Meta-Regression of Randomized Controlled Trials

Author

Skonieczna-Żydecka, Karolina, primary, Kaźmierczak-Siedlecka, Karolina, additional, Kaczmarczyk, Mariusz, additional, Śliwa-Dominiak, Joanna, additional, Maciejewska, Dominika, additional, Janda, Katarzyna, additional, Stachowska, Ewa, additional, Łoniewska, Beata, additional, Malinowski, Damian, additional, Borecki, Krzysztof, additional, Marlicz, Wojciech, additional, and Łoniewski, Igor, additional

Published
2020
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