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    Wyświetlanie 1-8 z 8
    Tytuł:
    Antioxidant Capacity of Lentil Flour Hydrolysates Obtained with Pancreatin
    Autorzy:
    Sulewska, Katarzyna
    Rybarczyk-Płońska, Anna
    Karamać, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/2152156.pdf
    Data publikacji:
    2022-11-13
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    lentil proteins
    degree of hydrolysis
    radical scavenging activity
    reducing power
    ferrous ion chelating activity
    Opis:
    Lentil is a valuable protein-rich crop, the health-promoting value of which can be further enhanced by its protein hydrolysis. In the present study, lentil flour was treated with pancreatin and the antioxidant capacity of the obtained hydrolysates with different degrees of hydrolysis (DH, 4–20%) was determined and compared with that of flour. The molecular weight (MW) distribution of the lentil proteins and their products of hydrolysis was analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Size exclusion-high-performance liquid chromatography (SE-HPLC) was deployed to show the profile of low MW compounds of the hydrolysates. Additionally, total phenolic contents were determined with the Folin-Ciocalteu’s phenol reagent. The hydrolysates had higher antiradical activity against DPPH•, Trolox equivalent antioxidant capacity (TEAC) measured by the assay with ABTS•+, ferric reducing antioxidant power (FRAP), and ability to bind Fe2+ compared to lentil flour. Between the hydrolysates, the highest DPPH• scavenging activity (EC50 of 0.298 mg/mL), TEAC (98.6 µmol Trolox/g), FRAP (109.2 μmol Fe2+/g), antioxidant capacity of lipid-soluble compounds (ACL) determined by photoluminescence method (4.32 µmol Trolox/g), and Fe2+ chelating activity (80% at hydrolysate concentration of 0.3 mg/mL) were found for those with low DH (4–8%), which contained some subunits of proteins, polypeptides, and peptides with a wide MW range (0.556–66 kDa). The total phenolic content increased with increasing DH. In conclusion, the antioxidant capacity of lentil flour can be significantly improved by the limited hydrolysis of its proteins with pancreatin, as a result of the release of polypeptides and peptides with a wide range of MW. Thus modified lentil flour may be addressed and explored in future research as a functional food ingredient.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2022, 72, 4; 381-391
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Locomotory activity and ion transport in the epithelium of terrestrial snails
    Autorzy:
    Tyrakowski, T.
    Kaczorowski, P.
    Pawlowicz, W.
    Ziolkowski, M.
    Kopczynska, E.
    Lampka, M.
    Holynska-Iwan, I.
    Piskorska, E.
    Stevesandt, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/84205.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Tematy:
    locomotor activity
    ion transport
    epithelium
    terrestrial snail
    snail
    land snail zob.tez terrestrial snail
    snail sole
    sole surface
    sole width
    sole epithelium
    Źródło:
    Folia Malacologica; 2012, 20, 1
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in ion (K, Ca and Na) regulation, antioxidant enzyme activity and photosynthetic pigment content in melon genotypes subjected to salt stress - a mixture modeling analysis
    Autorzy:
    Erdinc, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/11885877.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    Turkey
    arid habitat
    semi-arid habitat
    plant cultivation
    muskmelon
    Cucumis melo
    plant genotype
    antioxidant enzyme
    photosynthetic pigment content
    calcium ion
    potassium ion
    sodium ion
    salt stress
    Opis:
    The present study aimed to identify the response of melon accessions and cultivars to salt stress in terms of ion exchange, enzyme activity, lipid peroxidation and photosynthetic pigment contents by mixture modelling. In mixture modeling, it is expected that the data set demonstrates a heterogeneous structure. This heterogeneity is characterized as unobservable heterogeneity. The data set’s heterogeneity produces severe deviations in the parameter assessments and the standard deviations. Heterogeneity is overcome when the data set separates itself into homogeneous sub-populations. Mixture modeling was performed using the Mclust mixture cluster program of the statistical software package R 5.2.3. Sub-populations were constructed by evaluating genotypes according to studied traits and correlation analysis was performed using the SPSS software package. The seedlings of 13 melon genotypes were harvested two weeks after salt application (0 mM or 50 mM NaCl) when symptoms of salt stress were observed. Nutrient contents and ratios (K, Ca, Na, K : Na and Ca : Na); superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) activities malondialdehyde (MDA) chlorophyll a, chlorophyll b, total chlorophyll and carotenoid contents were measured. Mixture modeling and correlation analysis were used in evaluating the experimental data sets. Differences in responses to salt application were observed among genotypes. While all genotypes exhibited negative responses in terms of K : Na ratio, which is an important parameter of salt tolerance, the smallest decreases in K : Na ratios were observed in the YYU-11 (–57.09%) and YYU-4 (–58.78%) genotypes, indicating them to be the most tolerant to salt stress. In general, enzyme activity decreased in response to salt application, although the responses varied among genotypes, especially with regard to CAT and APX activity. The YYU-29 genotype was notable as the genotype with the highest K : Na ratio (1.79) as well as the smallest change in MDA content under salt stress.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 1; 165-183
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependent Catalytic Activity of Ag/PET Ion-Track Membranes Composites
    Autorzy:
    Borgekov, D.
    Mashentseva, A.
    Kislitsin, S.
    Kozlovskiy, A.
    Russakova, A.
    Zdorovets, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402216.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.23.Pq
    82.65.+r
    82.20.Pm
    Opis:
    Electroless deposition has been used to coat finely porous polyethylene terephthalate (PET) track-etched membranes with silver, forming silver nanotubes within the pores with inner and outer diameters of 60 and 100 nm. The sample's X-ray diffraction pattern shows a face-centered cubic crystalline phase of silver with the lattice constant 4.0838 nm. The average size of silver nanoclusters, as obtained from the scanning electron microscopy analysis is about 30 nm which is consistent with the X-ray diffraction results. The temperature dependent catalytic activity of prepared composites is demonstrated for two model reactions such as reduction of 4-nitrophenol (4-NP) and decomposition of hydrogen peroxide. Apparent constant rates and activation energy as well as reusability of catalysts were determined. The developed composite catalyst could be used consecutively for several runs without any damages for 4-NP reduction. For hydrogen peroxide reaction decomposition the reaction rate of the second cycle is reduced 2.4 times. Moreover, the second reuse reduced conversion of H₂O₂ to 54.7% suggests removal of active Ag centers during the first cycle of testing.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 871-874
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activity of new ammonium ionic liquids against fungi causing wood moulding
    Aktywność nowych amoniowych cieczy jonowych wobec grzybów wywołujących pleśnienie drewna
    Autorzy:
    Zabielska-Matejuk, J.
    Pernak, J.
    Kropacz, A.
    Kot, M.
    Stangierska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/52784.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    ammonium
    ammonium ion
    biocidal activity
    fungi
    ionic liquid
    mould
    mould fungi
    new ammonium
    wood
    wood resistance
    Opis:
    The results of the tests of the effectiveness of the action of new, not yet described in the literature group of biocidal ionic liquids were synthesised and presented. Those ionic liquids are derivatives of the leading structure, i.e. didecyldimethylammonium nitrate, and demonstrate strong action against mould fungi. Natural quaternary ammonium salts, mainly extracts from coconut and soybean, and from vegetable fats, were the basis for syntheses. Mycological tests were carried out on the wood of pine Pinus sylvestris L. (sapwood) in accordance with the method assumed binding for the assessment of biocide efficacy.
    Drewno użytkowane w warunkach wysokiej wilgotności ulega deprecjacji i procesom destrukcji biologicznej wywołanej działaniem mikroorganizmów. Szczególnie jest podatne na atak grzybów pleśniowych, wywołujących powierzchniowe przebarwienia, co pogarsza estetykę drewna oraz obniża jego konkurencyjność w stosunku do innych materiałów technicznych. Różnorodność gatunkowa oraz oporność grzybów pleśniowych na preparaty chemiczne jest problemem przy opracowaniu struktur skutecznych substancji czynnych, zwalczających tę grupę grzybów niedoskonałych. Zsyntezowano nową, nieopisaną w literaturze, grupę biobójczych cieczy jonowych, pochodnych struktury wiodącej – azotanu didecylodimetyloamoniowego, wykazujących silne działanie w stosunku do grzybów-pleśni. Bazą dla syntez były czwartorzędowe sole amoniowe pochodzenia naturalnego, głównie ekstrakty z kokosa, soi oraz tłuszczów roślinnych. Badania mikologiczne wykonano na drewnie sosny Pinus sylvestris L.(biel), zgodnie z metodą przyjętą jako obowiązującą w ocenie skuteczności działania biocydów. Opracowane ciecze jonowe wykazały aktywność wobec gatunku Chaetomium globosum, oraz mieszaniny: Aspergillus niger, Penicillium funiculosum, Alternaria alternata, Paecylomyces varioti, Trichoderma viride. Jako najsilniej działające ciecze jonowe wymienić należy związki o kationach: didecylodimetyloamoniowym, benzalkoniowym, dodecylotrimetyloamoniowym i cocotrimetyloamoniowym oraz szeregu anionów organicznych i nieorganicznych (również o właściwościach herbicydowych).
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2010, 53, 184
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular modelling of selected magnesium organic salts. Structure - activity relationship
    Molekularne modelowanie wybranych organicznych soli magnezowych. Zaleznosc struktura - aktywnosc
    Autorzy:
    Marcoin, W
    Powiązania:
    https://bibliotekanauki.pl/articles/15913.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    magnesium organic salt
    molecular modelling
    hydrophobicity
    organic ligand
    magnesium ion
    new drug
    medical research
    biochemical research
    Opis:
    Contemporary medical and biochemical research shows that Mg complex with organic ligands seem to be of great interest to researches. The study was undertaken in order to look for new drugs, which could meet the needs and expectations of clinical doctors. The selected QSAR parameters describing the geometrical structure of magnesium salts were compared with the log P values in order to estimate bioavailability of magnesium from these compounds. Intramolecular reactions e.g. donor-acceptor and occurence of hydrogen bonding influencing values of the calculated surface area of molecules to their volume and changes of log P value and polarity were confirmed.
    Współczesne badania medyczne i biochemiczne wykazały, że kompleksy Mg2+ z ligandami organicznymi wydają się interesujące. Poszukiwania coraz to nowych leków, które spełniłyby oczekiwania klinicystów, były inspiracją podjętych badań. Obliczono wybrane parametry QSAR opisujące geometryczną strukturę soli magnezowych i porównano je z wartością log P, aby móc ocenić biodostępność jonów magnezowych z tych związków. Potwierdzono oddziaływania wewnątrzcząsteczkowe typu donor-akceptor i wiązania wodorowe, mające wpływ na obliczone wartości powierzchni cząsteczek, ich objętości oraz zmiany wartości log P i polaryzowalności.
    Źródło:
    Journal of Elementology; 2006, 11, 1
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dense magnetized plasma and its applications: review of the 3-year activity of the IAEA Co-ordinated Research Programme
    Autorzy:
    Gribkov, V.
    Malaquias, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147438.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense magnetized plasma
    ion beams
    plasma beams
    neutron beams
    X-ray beams
    irradiation
    high energy density
    volumetric interaction
    Opis:
    A review of the results received in the course of fulfillment of the International Atomic Energy Agency Co-ordinated Research Project “Dense Magnetized Plasma” for the last 3 years is presented. Niche of the plasma type within the plasma physics field is outlined. Efforts of the CRP participants concentrated on design and operation of new Dense Magnetized Plasma devices are described. All of them designed for plasma heating and for other applications mainly based on the interaction of radiations generated by the devices with different objects. Materials exploitable, diagnostics of the interaction processes, as well as analytical equipment used by the participants to process the irradiated targets are described. Works developed in the frame of the CRP are covered thermonuclear fusion applications, fundamental plasma physics and material science issues, medicine, biology, and some other spheres. New data on the interaction of the radiations generated in this apparatus with various materials are given. E.g. it was found that the necessary dose producing activation/inactivation of enzymes can be much lower if used at a high-power flux density in comparison with those received with classical sources. All these experiments are discussed in the framework of pulsed radiation chemistry in its perfect sense thereto the criteria are formulated. New foreseen applications of DMP devices mainly based on neutron radiation are proposed and discussed.
    Źródło:
    Nukleonika; 2006, 51, 1; 5-13
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
      Wyświetlanie 1-8 z 8

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