Temat: total phenolic content - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Inﬂuence of extraction technique on yield and antioxidant activity of extracts from Moringa oleifera leaf
Autorzy:: Dzięcioł, Małgorzata
Powiązania:: https://bibliotekanauki.pl/articles/778776.pdf
Data publikacji:: 2020
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: Moringa oleifera
extracts
antioxidant activity
DPPH radical scavenging method
total phenolic content.
Opis:: The article presents research on the exploring of extraction process of biologically active substances from the leaves of the Moringa oleifera tree using ethanol. Ethanolic extracts were obtained using three different techniques: maceration with shaking, ultrasound-assisted extraction and extraction in Soxhlet apparatus, in different time variants: 1, 2 and 4-hours. After solvent evaporating and drying, the yields of dry extracts obtained in particular processes were calculated. The antioxidant activity of extracts was analyzed spectrophotometrically using DPPH radical scavenging method, and total phenolic content (TPC) was determined by Folin-Ciocalteu method. By means of gas chromatography with mass selective detector (GC-MS), 11 biologically active compounds present in ethanolic extracts were identiﬁed, among which α-tocopherol had the greatest share. Based on the results, the inﬂuence of the extraction technique and time on the yield and antioxidant activity of M. oleifera leaf extracts were discussed.
Źródło:: Polish Journal of Chemical Technology; 2020, 22, 4; 31-35
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Physiological and Biochemical Changes Induced by UV-B Radiation in Rosemary Plants Grown Under Salinity Stress
Autorzy:: Moghaddam, Abolghasem Hamidi
Arouiee, Hossein
Moshtaghi, Nasrin
Azizi, Majid
Shoor, Mahmoud
Sefidkon, Fatemeh
Powiązania:: https://bibliotekanauki.pl/articles/124221.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: antioxidant activity
cross-tolerance
hydrogen peroxide
ion content
total phenolic compounds
Opis:: Plants are exposed to solar ultraviolet radiation due to use of sunlight for photosynthesis. Additionally, salinity in soil or water influences the plant productivity and quality considerably. Moreover, when plants are simultaneously exposed to multiple stresses, one form of stress can affect the response to other stress. Particularly, it has been shown that they can benefit from dual tolerance as salinity and UV-B radiation are applied together. In order to understand the effects of UV-B radiation and salinity stress on some physiological and biochemical parameters, one-year-old cuttings of rosemary plants were grown under different levels of ultraviolet B radiation (0, 4.32 and 6.05 kJ m^-2 d^-1) and salinity stress (control, 50, 100 and 150 mM NaCl). The results showed that 4.32 kJ m^-2 d^-1 UV-B treatment significantly increased plant biomass up to 17.9% as compared to control. However, by increasing salinity to 150 mM, plant biomass significantly decreased up to 18.1%, as compared to control. Regardless of UV-B treatments, plants, grown under 100 mM salinity stress, had produced 2.8 times higher total phenolic compounds (TPC) and also have greater antioxidant activity (33.1%) in comparison to control. Both treatments, enhanced UV-B radiation and salinity stress, significantly increased the concentration of proline, hydrogen peroxide (H₂O₂) and malondealdehyde (MDA). In relation of total soluble sugar (TSS) and ion content, both treatments acted in an opposing manner. In turn, the enhanced UV-B radiation decreased concentration of TSS and the Na⁺ content in leaves, salinity stress increased the concentration of TSS, as well as the Na⁺ content in leaves and root. The plants grown under 150 mM salinity level accumulated 5.32 and 2.83 times higher Na⁺ ions in leaves and roots, respectively, than control. In addition, salinity significantly decreased the relative water content (RWC), photosynthetic pigments and K⁺ content in leaves and roots. The interaction between UV-B irradiation and salinity showed that the UV-B radiation improved the K⁺ content in leaves, RWC and membrane stability and consequently resulted in a better tolerance of rosemary to salinity.
Źródło:: Journal of Ecological Engineering; 2019, 20, 5; 217-228
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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