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Wyniki wyszukiwania dla: antioxidant%20activity
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Natural and synthetic antioxidants: An updated overview
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Antioxidants and HNE in the regulation of redox homeostasis
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"Food Oxidants and Antioxidants" Book review
PublikacjaThe book is the 14th title in the CRC series Chemical and Functional Properties of Food Components, edited since 2001 by Zdzisław E. Sikorski. The editor of the book, a professor in the University of Łódź and member of the Polish Academy of Sciences, is an internationally recognized authority in biochemistry and biophysics of reactive oxygen species. In Poland Grzegorz Bartosz has a reputation as the author of his most interesting...
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Dietary antioxidants as a source of hydrogen peroxide
PublikacjaStudies of 54 antioxidants revealed that 27 of them, mainly polyphenols, generated hydrogen peroxide (H2O2) when added to Dulbecco’s modified Eagle’s medium (DMEM), other media used for culture of mammalian and yeast cells and phosphate-buffered saline. The most active antioxidants were: propyl gallate (PG), (−)-epigallocatechin gallate (EGCG) and quercetin (Q). Chelex treatment and iron chelators decreased H2O2 generation suggesting...
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Antioxidants and proteins in ethylene-treated kiwifruits
PublikacjaW pracy porównano właściwości przeciwutleniające i profil białek owoców kiwi poddanych działaniu etylenu i powietrza. Wysokie współczynniki korelacji między całkowitą zawartością fenoli i właściwościami przeciwutleniającymi uzyskano dla trzech metod określania właściwości przeciwutleniających: ABTS, TEAC i CUPRAC. W paśmie białek owoców kiwi rozdzielonych za pomocą elektroforezy stwierdzono różnice w paśmie siarczanu dodecylu sodu...
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Quality of limes juices based on the aroma and antioxidant properties
PublikacjaKaffir (Citrus hystrix) and Key (Citrus aurantifolia) limes juices were investigated and compared. Two dimensional gas chromatography coupled with time-of-flight mass spectrometry (GC×GC-TOF-MS) was applied to assess the botanical origin of Kaffir and Key limes juices, based on volatile substances. The biggest differences in the contents of selected terpenes in Kaffir and Key limes occur in chemical compounds such as Limonene,...
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The Caucasian flora: a still-to-be-discovered rich source of antioxidants
PublikacjaCellular redox homeostasis is a state of balance between the formation of Usually Reactive Oxygen and / or Nitrogen Species (ROS/RNS), endogenous antioxidant defence systems, and exogenous dietary antioxidants. The disturbance of redox homeostasis, by the overproduction of endogenous ROS/RNS, may increase the risk of development of so-called civilisation diseases. The solution seems to be either the increased production of endogenous...
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Comparison of Redox Properties of Flavonoid Aglycones and Corresponding Glycosides and Their Mixtures in the Cellular Model
PublikacjaFlavonoids are polyphenolic compounds commonly found in plants. As dietary components, they have been shown to exhibit numerous pro-health properties that are believed to be associated with their antioxidant effects. In this study, the antioxidant activity of four flavonoid compounds was determined by cellular antioxidant activity assay using HT29 cells as a model of the alimentary tract. The strongest impact on cellular redox...
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Synthesis, physical and chemical properties of polyetherurethanes modified by natural antioxidant
PublikacjaOtrzymano nowe polieterouretany modyfikowane witaminą E. Ten naturalny przeciwutleniacz związany został z makrocząsteczkami w postaci bocznych odgałęzień poprzez wiązanie eterowe lub uretanowe, zależnie od użytego w syntezie jednego z dwóch rodzajów otrzymanych uprzednio monomerów. Polimery scharakteryzowano mierząc wytrzymałość na rozciąganie i twardość oraz absorpcję wody i oleju słonecznikowego. Odporność chemiczną badano oznaczając...
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Composition of polyphenols of asparagus spears (Asparagus officinalis) and their antioxidant potential
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Antioxidant Potential of Curcumin—A Meta-Analysis of Randomized Clinical Trials
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Bioactive compounds and the antioxidant capacity in new kiwi fruit cultivars
PublikacjaThe aim of this investigation was to find the best among seven different kiwi fruit cultivars (‘Hayward’, ‘Daheung’, ‘Haenam’, ‘Bidan’, ‘Hort16A’, ‘Hwamei’ and ‘SKK12’) for human consumption and to classify them as groups. Therefore, the contents of bioactive compounds and the level of antioxidant capacities of these cultivars were determined in four different extracts and compared. It was found that the contents of the bioactive...
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Metabolomic and antioxidant properties of different varieties and origins of Dragon fruit
PublikacjaDragon fruit has appealed much concern from consumers as a novelty fruit with potent nutritional and medicinal benefits. Dragon fruit quality warrants comprehensive evaluation, based on the contents of pigments and health- promoting natural compounds in different varieties. This study was aimed to evaluate the differences among dragon fruit varieties extracted with methanol–water (CD3OD-D2O) and methanol (CD3OD) by proton nuclear magnetic...
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Effect of in vitro gastro‐pancreatic digestion on antioxidant activity of low‐molecular‐weight (<3.5 kDa) peptides from dry‐cured pork loins with probiotic strains of LAB
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Supplementation of garlic lowers lipids and increases antioxidant capacity in plasma of rats
PublikacjaZbadano bioaktywność surowego i gotowanego czosnku (Allium sativium L.). Stwierdzono, że gotowanie czosnku w temperaturze 100 °C przez 20 minut nie wpływa na jego bioaktywność.Samcom szczurów (z badanej populacji) podzielonym losowo na 10 grup, podawano żywność z różnym dodatkiem czosnku. Natomiast grupa kontrolna była karmiona dietą podstawową złożoną ze skrobi pszenicznej, oleju sojowego, celulozy, minerałów i mieszaniny witamin....
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Effect of Storage Conditions on Storability and Antioxidant Potential of Pears cv. ‘Conference’
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Lifespan of etoposide-treated human neutrophils is affected by antioxidant ability of quercetin
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Mineral Composition and Antioxidant Potential of Coffee Beverages Depending on the Brewing Method
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The role of the enzymatic antioxidant system in cylindrospermopsin-induced toxicity in human lymphocytes
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The effects of NP-POL, the nonapeptide constituent of Colostrinin, on intracellular antioxidant system
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Antioxidant capacity and cholinesterase inhibiting properties of dietary infusions with Humulus lupulus
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Effects of Post-Harvest Elicitor Treatments with Ultrasound, UV- and Photosynthetic Active Radiation on Polyphenols, Glucosinolates and Antioxidant Activity in a Waste Fraction of White Cabbage (Brassica oleracea var. capitata)
PublikacjaBiosynthesis of phytochemicals in leaves of Brassica can be initiated by abiotic factors. The aim of the study was to investigate elicitor treatments to add value to waste of cabbage. A leaf waste fraction from industrial trimming of head cabbage was exposed to UV radiation (250–400 nm, 59 and 99 kJ m-2, respectively), photosynthetic active radiation (PAR, 400–700 nm, 497 kJ m-2), and ultrasound in water bath (35 kHz, at 15, 30...
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Phenolic composition and antioxidant properties of polish blue-berried honeysuckle genotypes by HPLC-DAD-MS, HPLC postcolumn derivatization with ABTS or FC, and TLC with DPPH visualization
PublikacjaIn this study, different Polish cultivars of blue-berried honeysuckles (Lonicera caerulea L.), wild and bog bilberry, were analyzed for bioactive compounds. The chemical properties verified included composition of anthocyanins and other polyphenols, antioxidant activity, and profiles of antioxidants by HPLC postcolumn derivatization or TLC. The antioxidant activities of different blue-berried honeysuckle cultivars were similar...
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Novel ABTS-dot-blot method for the assessment of antioxidant properties of food packaging
PublikacjaThe new ABTS-dot-blot method for the direct determination of antioxidant activity of active packaging that is in contact with foodstuffs has been developed. The usefulness of the new method was verified with the use of agarose, pork gelatin, bacterial cellulose and cellulose-chitosan films with incorporated standard antioxidant – Trolox or plant phytochemicals derived from three types of berry juices (chokeberry, blue-berried honeysuckle,...
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Application for novel electrochemical screening of antioxidant potential and phytochemicals in Cornus mas extracts
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Edible Flowers Extracts as a Source of Bioactive Compounds with Antioxidant Properties—In Vitro Studies
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Characterization of white cabbages from different cultivations by isothiocynates content and antioxidant activities
PublikacjaBadania epidemiologiczne wskazują, że wraz z zwiększeniem spożywania kapusty maleje ryzyko zachorowania na niektóre nowotwory. Mechanizmy przeciwrakotwórczego działania nie są do końca wyjaśnione, jednak wiele badań przeprowadzonych z wykorzystaniem zwierząt i ludzi sugeruje, że substancje występujące w tych roślinach, szczególnie izotiocyjaniany (ITC) modulują aktywność enzymów I i II fazy. Aktywność przeciwutleniająca jest innym...
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Antioxidant Activities and Volatile Flavor Components of Selected Single-Origin and Blend Chocolates
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A Comparison of ABTS and DPPH methods for assessing the total antioxidant capacity of human milk
PublikacjaCałkowitą zdolność przeciwutleniająca (TAC) mleka ludzkiego odzwierciedla zawartość i aktywność w mleku składników, które zapobiegają degradacji tłuszczów i białek na drodze utlenienia. Celem badania było porównuje testu ABTS i DPPH w odniesieniu do odzysku, precyzji i czułości (granica wykrywalności i oznaczalności) obu metod służących do oznaczania wartości TAC mleka ludzkiego. Wartości TAC zostały określone dla dwudziestu pięciu...
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Organic and conventional kiwifruit myths versus reality: antioxidant, antiproliferative and health effects
PublikacjaComparison between organic and conventional kiwifruit cultivars ''Hayward'' and ''Bidan'', which was done by four redical scavenging assays, ESI-MS, and DSC measurements, showed significant differences between cultivars. Such results were not estimated in kiwifruit growing under organic and conventional conditions. The extraction of bioactive compounds was done by two different methods: sequential extraction with ethyl acetate...
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Organic and conventional kiwifruit, myths versus reality: antioxidant, antiproliferative and helth effects
PublikacjaComparison between organic and conventional kiwifruit cultivars 'Hayward' and 'Bidan', which was done by four radical scavenging assays, ESI-MS, and DSC measurements, showed significant differences between the cultivars. Such results were not estimated in kiwifruit growing under organic and conventional conditions. The extraction of bioactive compounds was done by two different methods: sequential extraction with ethyl acetate...
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Antioxidant properties and resveratrol content of Polish Regent wines from Podkarpacie region
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New Chalcone Derivatives Containing 2,4-Dichlorobenzenesulfonamide Moiety with Anticancer and Antioxidant Properties
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Antioxidant effect of Elamipretide on bull's sperm cells during freezing/thawing process
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Coffee silverskin as a potential bio-based antioxidant for polymer materials: Brief review
PublikacjaCoffee silverskin is one of the by-products generated by the coffee industry. Although it is not the most burdensome one, because it stands only for ~4.2 wt % of coffee, it seems like an auspicious raw material for industrial processes. Coffee silverskin is characterized by a relatively low moisture content of ~5–7%, so it often does not require quite energy-consuming drying processes. The chemical composition of coffee silverskin,...
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Effects of basal level of antioxidants on oxidative DNA damage in humans
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Antioxidants: a premature scientific hypothesis that reshuffled the traditional food pyramid
PublikacjaAntioxidants present in substantial amounts in foods, plant-based products in particular, have been suggested as chemopreventive agents that can curb the development of undesirable health effects caused by oxidative stress simply by enriching diet in such compounds. This idea has been enthusiastically accepted by consumers, as well as food and pharmaceutical industry, and created great demand for products containing antioxidant...
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Antioxidant Interactions between Major Phenolic Compounds Found in 'Ataulfo' Mango Pulp: Chlorogenic, Gallic, Protocatechuic and Vanillic Acids
PublikacjaPhenolic compounds are known to have antioxidant capacity; however, there is little information about molecular interactions between particular phenolics found in fruits at different developmental stages. Therefore, the total antioxidant capacity of the phenolic compounds of a fruit may not correspond to the sum of individual antioxidant capacity given by antioxidants from that tissue. In this study, individual antioxidant capacity...
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The effect of convective heating and microwave heating on antioxidant enzymes in pooled mature human milk
PublikacjaThe effects of convective and microwave heating at constant temperature (62.5, 66 and 70 °C) on the activity of antioxidant enzymes (superoxide dismutase, SOD; catalase, CAT; glutathione peroxidase, GPx) in pooled mature human milk were compared. Activities of the enzymes were determined using spectrophotometric kits. Activity of GPx decreased significantly in the first stage of heating when milk samples were warmed to pasteurisation...
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Lipid mediators involved in the oxidative stress and antioxidant defence of human lung cancer cells
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Analysis of antioxidant capacity and polyphenol content of Goji fruit products available on the European market
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Chemical Composition and Antioxidant Properties of Powders Obtained from Different Plum Juice Formulations
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EDS1-Dependent Cell Death and the Antioxidant System in Arabidopsis Leaves is Deregulated by the Mammalian Bax
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Supplementation with antioxidant vitamins prevents oxidative modification of DNA in lymphocytes of HIV-infected patients
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Sperm Antioxidant Biomarkers and Their Correlation with Clinical Condition and Lifestyle with Regard to Male Reproductive Potential
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Mineral Composition and Antioxidant Potential in the Common Poppy (Papaver rhoeas L.) Petal Infusions
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Assessment of Lipophilicity Indices Derived from Retention Behavior of Antioxidant Compounds in RP-HPLC
PublikacjaReverse phase high pressure liquid chromatography was employed in order to evaluate the lipophilicity of antioxidant compounds from different classes, such as phenolic acids, flavanones, flavanols, flavones, anthocyanins, stilbenes, xantonoids, and proanthocyanidins. The retention time of each compound was measured using five different HPLC columns: RP18 (LiChroCART, Purosphere RP-18e), C8 (Zorbax, Eclipse XDBC8), C16-Amide (Discovery...
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Role of Litsea cubeba Essential Oil in Agricultural Products Safety: Antioxidant and Antimicrobial Applications
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Antimicrobial and antioxidant activities of Cinnamomum cassia essential oil and its application in food preservation
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A comparative study of phenolic compounds and antioxidant and antiproliferative activities in frequently consumed raw vegetables
PublikacjaCelem badań było oszacowanie właściwości przeciwutleniających wybranych warzyw spożywczych w stanie surowym: czosnek (Allium sativum L), biała, żółta i czerwona cebula (Allium cepa L), czerwony i zielony pieprz (Capsicum annuum L.) oraz biała kapusta (Brassica oleracea var. capitata f. alba) zbieranych w ciągu tego samego roku z różnych regionów geograficznych i stref klimatycznych. W badaniach odpowiednich ekstraktów metanolowych...