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Wyszukujesz frazę "Zielonka-Brzezicka, Joanna" wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Comparison of the antioxidant potential of some herbal teas produced from ecological and traditional crops
Autorzy:
Wira, Daria
Zielonka-Brzezicka, Joanna
Muzykiewicz-Szymańska, Anna
Klimowicz, Adam
Powiązania:
https://bibliotekanauki.pl/articles/1830664.pdf
Data publikacji:
2021-09-29
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
free radicals
organic cultivation
antiradical activity
polyphenols content
oxidative stress
Opis:
The growing public awareness of the dangers regarding chemicals used in traditional agriculture has led to consumers seeking valuable and contaminant-free products. Ecological agriculture has become synonymous with high health value and product safety. The aim of this study was to evaluate the antioxidant activity and the total polyphenolic content of infusions of herbal tea bags and loose teas from traditional crops, as well as infusions of loose teas from ecological crops. Raw material comprised dried flowers of Matricaria chamomilla and Tilia cordata, as well as dried leaves of Urtica dioica, Melissa officinalis and Mentha piperita. Herbal infusions were prepared using three brewing times: 5, 10 and 20 min. The analysis of antioxidant potential was performed using in vitro methods such as DPPH, ABTS and FRAP. The polyphenolic content was determined using the Folin-Ciocalteu method. The antioxidant activity of the studied tea infusion depended on the method by which the plants were cultivated and the brewing time. The ecological agriculture conditions seem not to stimulate the synthesis of antioxidants. However, the possibility to obtain other beneficial properties of the studied plants is an indication to carry out ecological cultivation.
Źródło:
Acta Universitatis Lodziensis. Folia Biologica et Oecologica; 2021, 17; 97-103
1730-2366
2083-8484
Pojawia się w:
Acta Universitatis Lodziensis. Folia Biologica et Oecologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of antioxidant activity of extracts of hop leaves harvested in different years
Autorzy:
Muzykiewicz, Anna
Nowak, Anna
Zielonka-Brzezicka, Joanna
Florkowska, Katarzyna
Duchnik, Wiktoria
Klimowicz, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2048759.pdf
Data publikacji:
2019
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
Humulus lupulus L.
DPPH
Folin-Ciocalteu method
FRAP
antioxidants
ultrasoundassisted extraction
metoda Folin-Ciocalteu
antyoksydanty
ekstrakcja wspomagana ultradźwiękami
Opis:
Introduction: Hop (Humulus lupulus L.) is a common plant in Europe, with many beneficial health effects. In addition to the use in brewing, hops are a valuable source of active substances used in conventional and folk medicine, such as humulones and lupulones, as well as antioxidants, including phenolic compounds. Objective: The aim of the study was to evaluate and compare the antioxidant activity of alcoholic extracts of fresh hop leaves collected in 2017 and 2018. Material and methods: The raw material consisting of fresh hop leaves was extracted using ultrasoundassisted extraction. Methyl, ethyl and isopropyl alcohol at three concentrations were used as extractants. The antioxidant activity of extracts was determined using DPPH and FRAP methods. Total phenolic content was evaluated using the Folin-Ciocalteu technique. Results: All the extracts showed antioxidant potential as well as the phenolic content. Regardless of the harvesting year and methods of evaluation, the highest antioxidant activity and the total polyphenol content were observed for extracts prepared in undiluted methanol, obtained during one hour lasting extraction. Conclusion: The results of the studies have suggested that hop leaves can be a potential source of healthpromoting antioxidants.
Źródło:
Herba Polonica; 2019, 65, 3; 1-9
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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