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    Wyświetlanie 1-6 z 6
    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
    Artykuł
    Tytuł:
    Fatty Acids Analysis and Antioxidant Activity of a Lipid Extract obtained from Mercurialis annua L. grown wildly in Jordan
    Autorzy:
    Al-Douri, Nedhal A.
    Shakya, Ashok K.
    Powiązania:
    https://bibliotekanauki.pl/articles/895262.pdf
    Data publikacji:
    2019-04-30
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    fatty acid methyl ester (FAME)
    GC-FID
    Mercurialis annua L
    DPPH radical scavenging activity
    β-carotene bleaching assay
    NO radical scavenging activity
    Opis:
    Aerial parts of Mercurialis annua L. were used in the present study, and fatty acid content in lipid extract was determined using GC-FID. The major fatty acids identified were α–linolenic acid (20.3%), heptadecanoic acid (12.8%), palmitic acid (11.9%), pentadecanoic acid (11.7%), cis-10-pentadecenoic acid (11.2%), linoleic acid (7.7%), tridecanoic Acid (4.6%), stearic (4.4%), cis-11,14-eicosadienoic acid (3.8%), beside of minor fatty acids (palmitoleic acid, cis-13,16-docosadienoic acid, arachidic acid, behenic acid, cis-10-heptadecenoic acid and myristic acid). Antioxidant properties of the extract were determined via DPPH radical scavenging, β-carotene bleaching assay and NO radical scavenging assay. The extract produced significant antioxidant activity in-vitro. The data shown here may broaden our knowledge on composition and antioxidant activity of lipid constituents from Mercurialis annua L.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 2; 275-281
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GC-MS Analysis and Biological activity of Essential Oil of Fruits, Needles and Bark of Pinus pinea grown wildly in Jordan
    Autorzy:
    Halloum, Baha
    Shakya, Ashok K.
    Elagbar, Zaha A.
    Naik, Rajashri R.
    Powiązania:
    https://bibliotekanauki.pl/articles/895316.pdf
    Data publikacji:
    2019-10-30
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    antibacterial activity
    essential oils
    antioxidant activity
    DPPH radical scavenging activity
    β-carotene bleaching assay
    Pinus pinea
    Opis:
    Essential oils from needles, fruits and bark was extracted from Pinus pinea L. (stone pine) grown wildly in Jordan. The chemical composition, antibacterial activity, antioxidant activity of essential oils was evaluated. The chemical compositions were identified using Gas-Chromatography-Mass spectrometry (GC-MS) and retention Indices (Van den Dool & Kratz). The results show that the essential oil obtained from needles composed mainly of Guaiol (12.7%), limonene (11.42%), and β-caryophyllene (7.61%), while fruit contains limonene (32.56%), and α-pinene (6.78%). The essential oils from barks were rich in β-caryophyllene (16.51%), limonene (14.83%), caryophyllene oxide (11.83%), and longifolene (7.51%). In vitro, antibacterial activity of the essential oil samples was evaluated using agar-well diffusion method against three different strains of bacteria (Gram¬-positive bacteria: Staphylococcus aureus and Gram-negative bacteria: Klebsiella pneumoniae and Escherichia coli). The results showed that essential oil showed appreciable antibacterial activity against S. aureus. The essential oil from fruit exhibited weak antibacterial activity against E. coli and K. pneumoniae. Essential oils of P. pinea showed appreciable antioxidant activity in-vitro.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 5; 825-831
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study of the antioxidant activity and phytochemical composition of leaves extract between three varieties of date palm tree
    Autorzy:
    Eddine, L. S.
    Ladjel, S.
    Mohamed, O. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412430.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Phoenyx dactylifera
    polyphenol
    DPPH radical-scavenging activity
    reducing power
    antimicrobial
    south Algeria
    Opis:
    The date palm (Phoenyx dactylifera) consisted, for the people of southern Algeria, as tree of providence. Dates and their extracts are also used for many centuries as a medicine against allergy, inflammation, constipation and gastro-protective; they also have a high antibacterial and antioxidant activity. However, no studies are conducted to evaluate the extract from the leaves of date palm (Phoenyx dactylifera) in point of view of phytochemical composition, antimicrobial and the antioxidant activity. In this study, we have determined the phenolic compounds, antioxidant and antimicrobial activity of methanolic extracts from three varieties of leaves tree. According to the results the leaves extracts have very important values for polyphenols (215.24 to 156.46 mg GAE / g DW) and high antioxidant activity (324. 45 to 206.21 mg GAE / g DW), Diphenyl-1 picrylhydrazyl radical-scavenging activity (IC50 = 2.98 to 4.83 μg / ml); also the three extracts reveal a considerable antimicrobial potency and antifungal considerable activity, the diameter of inhibition is 35.2 to 39.5 mm (concentration 50 mg/ml) for Candida albicans ATCC 90026.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 9, 2; 162-171
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of 2,5-dichloro-1,4-benzoquinone on jack bean urease activity. Inhibitory effect, total reducing capacity and DPPH radical scavenging activity
    Autorzy:
    Kot, Mirosława
    Olech, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/1039867.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    reducing capacity
    inhibition
    urease
    Folin-Ciocalteu method
    2,5-dichloro-1,4-naphthoquinone
    DPPH scavenging activity
    Opis:
    Inhibition of jack bean activity by 2,5-dichloro-1,4-benzoquinone (DCBQ) was studied in phosphate buffer, pH 7.0. It was found that DCBQ acted as a strong, time and concentration dependent inactivator of urease. Under the experimental conditions obeyed the terms of pseudo-first-order reaction, urease was totally inactivated. Application of Wilson-Kitz method proved that the urease-DCBQ interaction followed a simple bimolecular process and the presence of intermediate complex was undetectable. The determined second order rate constant of the inactivation was 0.053 (μM min)-1. Thiols such as l-cysteine, glutathione and dithiothreitol (DTT) protected urease from inhibition by DCBQ but DCBQ-modified urease did not regain its activity after DTT application. The thiol protective studies indicated an essential role of urease thiol(s) in the inhibition. The irreversibility of the inactivation showed that the process was a result of a direct modification of urease thiol(s) by DCBQ (DCBQ chlorine(s) substitution). The decomposition of DCBQ in aqueous solution at natural light exposure was monitored by visible spectrophotometry, determination of the total reducing capacity (Folin-Ciocalteu method) and DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging ability. The DCBQ conversion resulted in a decrease of the inhibition power and was well correlated with the increase of the total reducing capacity and DPPH scavenging ability. These findings were attributed to DCBQ transformation by photolysis and the hydrolysis effect was found to be negligible.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 4; 627-633
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of biologically active substances on antioxidant activity in rapeseed oil tested in accelerated oxidative process
    Wpływ dodatku wybranych substancji biologicznie czynnych na aktywność antyoksydacyjną oleju rzepakowego poddanego przyspieszonemu procesowi autooksydacji
    Autorzy:
    Kania, M.
    Michalak, M.
    Gogolewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/833608.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    biologically active substance
    antioxidant activity
    rapeseed oil
    accelerated oxidative process
    tocopherol
    free radical scavenging
    DPPH method
    menadione K3
    ubiquinon Q10
    beta-carotene
    quercetin
    coenzyme Q10
    vegetable oil
    Źródło:
    Rośliny Oleiste - Oilseed Crops; 2005, 26, 1
    1233-8273
    Pojawia się w:
    Rośliny Oleiste - Oilseed Crops
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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