Temat: scavenging - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Distribution patterns and feeding strategies of lysianassoid amphipods in shallow waters of an Arctic fjord
Autorzy:: Legeżyńska, Joanna
Powiązania:: https://bibliotekanauki.pl/articles/2052395.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Arctic
Svalbard
scavenging fauna
lysianassoid amphipods
Źródło:: Polish Polar Research; 2001, 22, 3-4; 173-186
0138-0338
2081-8262
Pojawia się w:: Polish Polar Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Antioxidative Capacity of Soyfoods and Soy Active Compounds
Autorzy:: Chitisankul, Wanida T.
Shimada, Kazuko
Tsukamoto, Chigen
Powiązania:: https://bibliotekanauki.pl/articles/2019471.pdf
Data publikacji:: 2022-03-01
Wydawca:: Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:: soybean
ORAC
isoflavone
peroxyl radical scavenging
soy saponin
Opis:: Soyfood isoflavones and soyasaponins are the effective compounds relating to their health-promoting properties. Their chemical structure plays an important role in their antioxidative activity. Thus, six isoflavones and four soyasaponins that are targeted in soyfood were evaluated for their peroxyl radical scavenging capacities by the hydrophilic-oxygen radical absorbance capacity (H-ORAC) method. The antioxidant capacity of non-fermented and fermented soyfoods was also determined by the same method. The results revealed that isoflavones showed higher peroxyl radical scavenging capacities than soyasaponin, with their activities found to depend on their chemical structure. The aglycone isoflavones promoted higher H-ORAC values than glycoside and malonyl glycoside isoflavones, respectively. On the other hand, DDMP saponin promoted a higher H-ORAC value than its derived compound, group B saponin, and the aglycone soyasaponin. In the case of soyfoods, fermented soyfoods had higher antioxidative capacity that the non-fermented ones, especially the long-term fermented products. Soybean-koji miso presented the highest H-ORAC value, followed by natto, soy sauce, and tempeh. Moreover, lightness (L*) of miso and soy sauce showed a negative correlation with H-ORAC value probably due to browning substances which might derive from the amino-carbonyl reaction. Considering the high antioxidant capacity of fermented soyfoods, it might relate to aglycone isoflavones which promote strong radical scavenging capacity. Thus, fermented soyfoods, especially miso and natto, could be considered as health-promoting foods.
Źródło:: Polish Journal of Food and Nutrition Sciences; 2022, 72, 1; 101-108
1230-0322
2083-6007
Pojawia się w:: Polish Journal of Food and Nutrition Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Plants take action to mitigate salt stress: Ask microbe for help, phytohormones, and genetic approaches
Autorzy:: Hewedy, Omar A.
Mahmoud, Ghada Abd-Elmonse
Elshafey, Naglaa F.
Khamis, Galal
Karkour, Ali M.
Abdel Lateif, Khalid S.
Amin, Basma H.
Chiab, Nour
El-Taher, Ahmed M.
Elsheery, Nabil I.
Powiązania:: https://bibliotekanauki.pl/articles/2174285.pdf
Data publikacji:: 2022
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: Bacillus
ion homeostasis
osmoprotectants
osmotic stress
photosynthesis
ROS scavenging
Opis:: Global agriculture is a pivotal activity performed by various communities worldwide to produce essential human food needs. Plant productivity is limited by several factors, such as salinity, water scarcity, and heat stress. Salinity significantly causes short or long-term impacts on the plant photosynthesis mechanisms by reducing the photosynthetic rate of CO2 assimilation and limiting the stomatal conductance. Moreover, disturbing the plant water status imbalance causes plant growth inhibition. Up-regulation of several plant phytohormones occurs in response to increasing soil salt concentration. In addition, there are different physiological and biochemical mechanisms of salt tolerance, including ion transport, uptake, homeostasis, synthesis of antioxidant enzymes, and osmoprotectants. Besides that, microorganisms proved their ability to increase plant tolerance, Bacillus spp. represents the dominant bacteria of the rhizosphere zone, characterised as harmless microbes with extraordinary abilities to synthesise many chemical compounds to support plants in confronting salinity stress. In addition, applying arbuscular mycorrhizal fungi (AMF) is a promising method to decrease salinity-induced plant damage as it could enhance the growth rate relative to water content. In addition, there is a demand to search for new salt-tolerant crops with more yield and adaptation to unfavourable environmental conditions. The negative impact of salinity on plant growth and productivity, photosynthesis, stomatal conductance, and changes in plant phytohormones biosynthesis, including abscisic acid and salicylic acid, jasmonic acid, ethylene, cytokinins, gibberellins, and brassinosteroids was discussed in this review. The mechanisms evolved to adapt and/or survive the plants, including ion homeostasis, antioxidants, and osmoprotectants biosynthesis, and the microbial mitigate salt stress. In addition, there are modern approaches to apply innovative methods to modify plants to tolerate salinity, especially in the essential crops producing probable yield with a notable result for further optimisation and investigations.
Źródło:: Journal of Water and Land Development; 2022, 55; 1--16
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

Tytuł:: Physicochemical Properties of Biscuits Enriched with Horseradish (Armoracia rusticana L.) Products and Bioaccessibility of Phenolics after Simulated Human Digestion
Autorzy:: Tomsone, Lolita
Galoburda, Ruta
Kruma, Zanda
Majore, Kristine
Powiązania:: https://bibliotekanauki.pl/articles/1363311.pdf
Data publikacji:: 2020
Wydawca:: Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:: horseradish
pomace
microencapsulated juice
total phenolic content
radical scavenging activity
bioaccessibility
Opis:: Health-conscious consumers are interested in products with an increased bioactive compound content. The nutritional quality is considered both as a stability and bioaccessibility concern. The aim of this study was to investigate the effect of horseradish products (horseradish root pomace, horseradish leaf pomace, microencapsulated horseradish root and leaf juice) on the physicochemical properties of biscuits, as well as to assess in vitro bioavailability and activity of phenolics. The bioactive compounds and antioxidant activity of horseradish products, which were used to replace the flour in biscuit dough, were analysed. Physicochemical parameters (pH, water activity, colour, phenolic compound contents, and antioxidant activities) were determined for the biscuits. Horseradish products compared to other cruciferous vegetables have a high content of phenolic compounds, as well as high antioxidant activity. Higher levels of bioactive compounds were found in microencapsulated horseradish leaf juice, compared to the other horseradish products used in the study. Enriched biscuits had a significantly higher total phenolic content (TPC) and antioxidant activity, compared to the control. After 180-day storage, TPC of biscuits with horseradish root products did not change significantly but in biscuits with horseradish leaf products it decreased by 27–29%. The bioaccessibility index of phenolic compounds after in vitro digestion of enriched biscuits ranged between 2.19 and 2.99. Microencapsulated horseradish leaf juice was more effective in enriching biscuits with bioactive compounds. The developed biscuits enriched with horseradish products could meet consumer expectations for healthy, functional food.
Źródło:: Polish Journal of Food and Nutrition Sciences; 2020, 70, 4; 419-428
1230-0322
2083-6007
Pojawia się w:: Polish Journal of Food and Nutrition Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Nutritional Properties, Antioxidant and Antihaemolytic Activities of the Dry Fruiting Bodies of Wild Edible Mushrooms Consumed by Ethnic Communities of Northeast India
Autorzy:: Kokoti, Merilin
Hazarika, Dibiya J.
Parveen, Assma
Dullah, Samim
Ghosh, Alokesh
Saha, Dipankar
Barooah, Madhumita
Boro, Robin Ch.
Powiązania:: https://bibliotekanauki.pl/articles/2019175.pdf
Data publikacji:: 2021-12-01
Wydawca:: Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:: antihaemolytic activity
basidiomycota
radical scavenging activity
nutrients
organic acids
phenolic acids
Opis:: A variety of cultivated mushrooms in Northeast India are well known for their taste, nutritional and medicinal benefits. Many wild-growing mushrooms are also consumed due to their exotic flavours and tastes; however, the scientific exploration of their nutritional and bioactive properties is still negligible. In the present study, the 32 wild edible mushroom samples of 11 species collected from different parts of Northeast India were evaluated for their proximate composition, mineral and vitamin (ascorbic acid and riboflavin) contents, antioxidant and antihaemolytic activity, and profiles of organic and phenolic acids. Lentinus sajor-caju and Lentinus squarrosulus had the highest carbohydrate content (49.80 g/100 g dry weight (d.w.) and 46.36 g/100 g d.w., respectively), crude protein content (20.72 g/100 g d.w. and 20.54 g/100 g d.w., respectively) and a considerable content of minerals. The highest fat content was determined in Lentinus velutinus (7.17 g/100 g d.w.). Among the minerals, potassium was found as the most abundant in all the samples. The extracts of L. sajor-caju, L. squarrosulus, and Pleurotus pulmonarius were characterized by the highest antioxidant activity, while these of L. sajor-caju, Pleurotus ostreatus, P. pulmonarius and Agaricus bisporus showed the highest antihaemolytic potential. The HPLC analysis allowed determining the high contents of ascorbic acid and a few organic and phenolic acids such as lactic acid, gallic acid, 3,4-dihydroxybenzoic acid and trans-cinnamic acid in the tested mushrooms. Other compounds viz. citric acid, caffeic acid, riboflavin, vanillic acid, pyruvic acid, and p-coumaric acid were detected with variations. This study established the nutritional and health-promoting benefits of wild edible mushrooms of Northeast India region for consumption as functional foods in human diet.
Źródło:: Polish Journal of Food and Nutrition Sciences; 2021, 71, 4; 463-480
1230-0322
2083-6007
Pojawia się w:: Polish Journal of Food and Nutrition Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: THE INFLUENCE OF STORAGE TEMPERATURE AND UV-IRRADIATION ON FREE RADICAL SCAVENGING PROPERTIES OF ETHANOLIC EXTRACTS OF PROPOLIS
Autorzy:: Komosińska-Vassev, Katarzyna
Olczyk, Paweł
Ramos, Paweł
Mencner, Lukasz
Derkacz, Alicja
Waluga, Ewa
Krysik, Katarzyna
Olczyk, Krystyna
Pilawa, Barbara
Powiązania:: https://bibliotekanauki.pl/articles/895577.pdf
Data publikacji:: 2018-01-31
Wydawca:: Polskie Towarzystwo Farmaceutyczne
Tematy:: EPR spectroscopy
DPPH
free radical scavenging
ethanol extracts of propolis
UV-irradiation
Opis:: The free radical scavenging activity of ethanolic extracts of propolis (EEP) at the concentrations of 3%, 7%, and 10% was examined. The impact of storage temperature and exposure to ultraviolet (UV) light on the interactions of extracts of propolis with the model DPPH free radicals was also determined. The quenching of an X-band electron paramagnetic resonance spectra of DPPH free radicals by the extracts stored at room temperature, heated at the temperature of 50 oC and exposed to UV-irradiation, were compared. The examined propolis ethanolic extracts revealed an antioxidative character. The storage of the samples at a higher temperature (50 oC) caused a decrease of the scavenging activity equaling to 7% and 10% EEP. UV-irradiation of the 3% EEP increased the quenching of DPPH free radical lines. The reverse effect was observed for the 7% and 10% propolis extracts. The 3% ethanolic extract of propolis is more stable for storage at 50ºC, and less than other analyzed EEP susceptible for UV-irradiation. Alterations of the antioxidative properties of the analyzed EEP and changes in the kinetics of their interactions with free radicals, indicate that 3%, 7%, and 10% propolis extracts should not be exposed to the temperature of 50 oC and UV-irradiation.
Źródło:: Acta Poloniae Pharmaceutica - Drug Research; 2018, 74, 6; 1833-1840
0001-6837
2353-5288
Pojawia się w:: Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Free radical scavenging ability of sodium lignosulfonate and its application in food grade polypropylene
Autorzy:: Musajian, Dilhumar
Hasan, Gvlmira
He, Mingyu
Yimit, Mamatjan
Powiązania:: https://bibliotekanauki.pl/articles/777895.pdf
Data publikacji:: 2020
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: cotton lignin
sodium lignosulfonate
free radical scavenging
antioxidant properties, food
grade PP
Opis:: Sodium lignosulfonate (SL) was prepared from waste of cotton lignin (CL) through hydrothermal reaction method. Orthogonal experiment was designed with value of OIT as objective function. Polypropylene (PP) is a polymer produced by the addition polymerization of propylene. It is a white waxy material with a transparent and light appearance, which is widely used in food and pharmaceutical packaging. The results of GPC and TG analysis revealed that SL has stable thermal properties, which means that SL has the potential to be an antioxidant for PP materials. In addition, the scavenging effects of CL and SL were studied. The obtained results exhibited that the SL can obviously increase the scavenging effect on free radicals and it is a kind of new synthetic antioxidant with antioxidant property, which could effectively delay the oxidation of PP. Subsequent rheological experiments proved that the SL/PP sample can improve the heat-resistant oxygen performance of PP under the thermal oxygen shearing environment. Combined with the effect of SL on the mechanical properties of PP before aging, SL has a stabilizing effect on PP thermal oxygen aging.
Źródło:: Polish Journal of Chemical Technology; 2020, 22, 2; 56-66
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

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: 10.

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

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Skocz do pozycji: 11.

Tytuł:: Towards understanding vacuolar antioxidant mechanisms
Autorzy:: Peshev, D.
Vergauwen, R.
Hideg, E.
Van den Ende, W.
Powiązania:: https://bibliotekanauki.pl/articles/80706.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: conference
plant
abiotic stress
reactive oxygen species
scavenging
antioxidant
oxidative stress
hydroxyl radical
Źródło:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Involvement of ROS and its scavenging enzymes in the response of dormant Avena fatua L. caryopses to karrikinolide (KAR1)
Autorzy:: Cembrowska-Lech, D.
Kepczynski, J.
Powiązania:: https://bibliotekanauki.pl/articles/80050.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: conference
reactive oxygen species
scavenging enzyme
Avena fatua
caryopsis
germination
dehydrogenase activity
amylase
Źródło:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: The removal efficiency of dust during short-term rains - verification of additional factors
Skuteczność usuwania pyłu podczas opadów krótkotrwałych - weryfikacja dodatkowych czynników
Autorzy:: Olszowski, T.
Powiązania:: https://bibliotekanauki.pl/articles/127554.pdf
Data publikacji:: 2017
Wydawca:: Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:: precipitation
PM10
scavenging process
background area
opad atmosferyczny
proces wymywania
obszar niezurbanizowany
Opis:: This paper reports the results of a comparison of the results of field study concerned with the effectiveness of PM10 scavenging by liquid precipitation in a warm and cold season of the year. The aim of this study involved: - verifying if the value of the removal coefficient (DC) is relative to the duration of the phenomena of wet deposition, - verification of a hypothesis that the initial value of PM concentration does not affect the value of DCPM10. The registration of the variability of PM concentrations was undertaken over the period of seven years in the conditions of the occurrence of convective and large-scale precipitation and it was performed in a non-urbanized area. The analysis involved 344 cases of observation with the constant time interval of 0.5 h. The measurements of PM10 mass concentration was performed with the aid of a reference method accompanied by concurrent registration of the basic meteorological parameters. It was indicated that the value of the removal coefficient assumes similar values in the cold and warm season for all types of precipitation with the mean intensity of R > 0.5 mm h–1. It was additionally noted that the effectiveness of PM10 removing by precipitation with various origin does not statistically vary according to the season. It was indicated that for precipitation with a low intensity, the values of the mass concentration of particulate matter in the ground-level zone could affect the values of the removal coefficient. It was also concluded that the diverse structure of wet deposition with a small intensity plays an important role in the process of the scavenging of solid particulate matter from close-to-ground troposphere.
Artykuł prezentuje porównanie rezultatów badań polowych nad efektywnością wymywania PM10 przez opady ciekłe występujące w chłodnym i ciepłym okresie roku. Celami artykułu było: - sprawdzenie, czy wartość współczynnika usuwania (DC) zależy od okresu występowania zjawiska mokrej depozycji, - weryfikacja hipotezy, iż początkowa wartość koncentracji nie wpływa na wartość DCPM10. Siedmioletnie rejestracje zmian stężenia pyłu w warunkach występowania opadów konwekcyjnych i wielkoskalowych przeprowadzono na obszarze niezurbanizowanym. Analizie poddano 344 przypadki obserwacji o stałej rozdzielczości czasowej 0,5 h. Pomiary stężenia PM10 prowadzono z użyciem metody referencyjnej przy jednoczesnej rejestracji podstawowych parametrów meteorologicznych. Wykazano, że współczynnik usuwania DCPM10 przyjmuje podobne wartości w sezonie chłodnym i ciepłym dla wszystkich form opadów ciekłych o średnim natężeniu R > 0,5 mm h–1. Stwierdzono, że efektywność wymywania PM10 przez opady o różnej genezie nie różni się statystycznie dla sezonu chłodnego i ciepłego. Pokazano, że dla opadów o niskiej intensywności wartość koncentracji pyłu w troposferze przyziemnej przed opadem może wpływać na wartość współczynnika usuwania. Wykazano, że odmienna struktura form mokrej depozycji o niskiej intensywności odgrywa istotną rolę w procesie wymywania cząstek stałych z atmosfery przyziemnej.
Źródło:: Proceedings of ECOpole; 2017, 11, 1; 65-76
1898-617X
2084-4557
Pojawia się w:: Proceedings of ECOpole
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

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

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Tytuł:: Obliczenia numeryczne wymiany ładunku w silniku dwusuwowym z przeciwbieżnym układem tłoków
Scavenging process CFD computations in a two stroke opposed-piston engine
Autorzy:: Szczeciński, M.
Mazuro, P.
Skrobek, W.
Powiązania:: https://bibliotekanauki.pl/articles/132970.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: wymiana ładunku w cylindrze
silnik z przeciwbieżnym układem tłoków
cylinder scavenging
opposed-piston engine
Opis:: Dwusuwowe silniki tłokowe z przeciwbieżnym układem tłoków coraz częściej budzą zainteresowanie ośrodków badawczych na całym świecie. Konstrukcje te mają długą historię, a renesans zainteresowania związany jest z szeroką gamą zalet, które oferują. Jedną z nich jest wzdłużny system płukania cylindra. W artykule przed-stawiono proces modelowania wymiany ładunku jako część projektu układu rozrządu badawczego silnika z przeciwbieżnym układem tłoków. Omówiono parametry, których zmiana pozwala kontrolować zastosowane kryteria jakości płukania. Przedstawiono wyniki symulacji numerycznych oraz podkreślono główne wyzwania czekające na konstruktorów projektujących układ rozrządu w podobnej konstrukcji.
Two stroke opposed piston engines increasingly attract an interest among the research centers around the world. This engine architecture has a long story and renaissance of its interest is associated with a wide gamut of benefits they offer. The uniflow cylinder scavenging is definitely one of them. This paper presents a modeling process of the in-cylinder gas exchange as a part of the research engine timing system design. In addition, it highlights dependencies between the timing system design parameters and the scavenging quality factors. Final-ly, the article demonstrates numerical simulation results and takes into consideration main challenges in the piston ported timing system designing.
Źródło:: Combustion Engines; 2015, 54, 3; 563-569
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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