Temat: antioxidants - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Green tea and comprehensive healing properties of polyphenols
Autorzy:: Grzywacz, Agata
Tematy:: antioxidants
polyphenols
tea; Pokaż więcej
Wydawca:: Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
Powiązania:: https://bibliotekanauki.pl/articles/1033834.pdf Link otwiera się w nowym oknie
Opis:: Tea, Camellia sinensis L. is the most widely drunk beverage in the world. Comprehensive healing properties of this refreshing, mildly stimulating drink are known in traditional medicine dating back almost 5000 years. Tea healing and disease prevention mechanism is mostly based on antioxidant properties. Tea beverage is a rich source of polyphenols, especially catechins which are very powerful antioxidants. The most abundant catechins in tea beverage are epigallocatechin 3-gallate (EGCG), epigallocatechin (EGC), epicatechin 3-gallate (ECG), and epicatechin (EC). Many investigations i.e. population-based, screening, involving patients and also with animal or cell models, show many valuable pharmacological properties of tea. It is proved by numerous studies that drinking tea or taking tea extracts can prevent chronic diseases, including coronary heart disease and many types of cancer. It can also help with diabetes, hypertension and obesity and may contribute to inflammation reduce. Better understanding of tea healing properties could help reduce high costs of medical care, improve treatment of lifestyle diseases, and transform tea beverage into an evidence based functional food.
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Flight training and dietary antioxidants have mixed effects on the oxidative status of multiple tissues in a female migratory songbird
Autorzy:: DeMoranville, Kristen J.
Trost, Lisa
Pierce, Barbara J.
Działo, Maciej
Bryła, Amadeusz
Frawley, Abigail E.
McWilliams, Scott R.
Carbeck, Katherine M.
Bauchinger, Ulf
Sadowska, Edyta
Opis:: Birds, like other vertebrates, rely on a robust antioxidant system to protect themselves against oxidative imbalance caused by energy-intensive activities such as flying. Such oxidative challenges may be especially acute for females during spring migration, since they must pay the oxidative costs of flight while preparing for reproduction; however, little previous work has examined how the antioxidant system of female spring migrants responds to dietary antioxidants and the oxidative challenges of regular flying. We fed two diets to female European starlings, one supplemented with a dietary antioxidant and one without, and then flew them daily in a windtunnel for two weeks during the fall and spring migration periods. We measured the activity of enzymatic antioxidants (GPx, SOD, CAT), non-enzymatic antioxidant capacity (ORAC), and markers of oxidative damage (protein carbonyls and lipid hydroperoxides) in four tissues: pectoralis, leg, liver, and heart. Dietary antioxidants affected enzymatic antioxidant activity and lipid damage in the heart, non-enzymatic antioxidant capacity in the pectoralis, and protein damage in leg muscle. In general, birds fed less antioxidants appear to incur increased oxidative damage while upregulating non-enzymatic and enzymatic antioxidant activity, though these effects were strongly tissue-specific. We also found trends for diet x training interactions for enzymatic antioxidant activity in the heart and leg. Flight-training may condition the antioxidant system of females to dynamically respond to oxidative challenges, and females during spring migration may shift antioxidant allocation to reduce oxidative damage.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Hydroxy-plastochromanol and plastoquinone-C as singlet oxygen products during photo-oxidative stress in Arabidopsis
Autorzy:: Nowicka, Beatrycze
Szymańska, Renata
Kruk, Jerzy
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Proximate composition, antioxidant activities and fatty acid profiling of selected Mushrooms collected from Azad Jammu and Kashmir
Autorzy:: Shahid, Muhammad
Fatima, Hina
Anjum, Fozia
Riaz, Muhammad
Tematy:: antioxidants
fatty acids
mushroom
nutraceutical; Pokaż więcej
Wydawca:: Polskie Towarzystwo Farmaceutyczne
Powiązania:: https://bibliotekanauki.pl/articles/895683.pdf Link otwiera się w nowym oknie
Opis:: Mushrooms can be used in diet as nutraceutical or functional foods for promoting and maintaining health quality and health longevity. Mushrooms just like medicinal plants can be utilized in the form of powder or extract as curative agents of several diseases and in providing a healthy diet. In current study, ten different mushroom species were collected from Azad Jammu and Kashmir. The selected mushrooms were assessed for their nutritional value, biological activities and fatty acid profiling. Before extraction, proximate analysis of all selected mushrooms was performed. Protein, fat, ash and total carbohydrate contents ranged from 10-30%, 0.43-8.08%, 1.1-9.14%, 12.47-92.52%, respectively. Then mushrooms were extracted with three different solvents n-hexane, ethyl acetate and methanol for the assessment of their antioxidant potentials through different antioxidant assays like total phenolics, total flavonoid contents and DPPH inhibition assay. The order of antioxidant potential in different solvent is methanol>Ethyl acetate>n-hexane. Quantification of fatty acids by GC/MS analysis revealed that stearic acid, palmitic acid, oleic acid, linolenic acid were present in significant quantity in different mushrooms and unsaturated fatty acids were found abundant over saturated fatty acids in all the selected mushrooms. So presence of fatty acids in studied samples is one of the main biologically active ingredients from mushrooms. The study concluded that the selected mushrooms from different regions of Azad Jammu and Kashmir are of nutritional importance having significant antioxidant potential and contains several unsaturated fatty acids which contribute to the nutritional value of mushrooms.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Correlation between mammalian cell cytotoxicity of flavonoids and the redox potential of phenoxyl radical/phenol couple
Autorzy:: Marozienė, Audronė
Nemeikaitė-Čėnienė, Aušra
Vidžiūnaitė, Regina
Čėnas, Narimantas
Tematy:: cytotoxicity
antioxidants
flavonoids
oxidative stress; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1039753.pdf Link otwiera się w nowym oknie
Opis:: Flavonoids exhibit prooxidant cytotoxicity in mammalian cells due to the formation of free radicals and oxidation products possessing quinone or quinomethide structure. However, it is unclear how the cytotoxicity of flavonoids depends on the ease of their single-electron oxidation in aqueous medium, i.e., the redox potential of the phenoxyl radical/phenol couple. We verified the previously calculated redox potentials for several flavonoids according to their rates of reduction of cytochrome c and ferricyanide, and proposed experimentally-based values of redox potentials for myricetin, fisetin, morin, kaempferol, galangin, and naringenin. We found that the cytotoxicity of flavonoids (n=10) in bovine leukemia virus-transformed lamb kidney fibroblasts (line FLK) and murine hepatoma (line MH-22a) increases with a decrease in their redox potential of the phenoxyl radical/phenol couple and an increase in their lipophilicity. Their cytotoxicity was decreased by antioxidants and inhibitors of cytochromes P-450, α-naphthoflavone and isoniazide, and increased by an inhibitor of catechol-O-methyltransferase, 3,5-dinitrocatechol. It shows that although the prooxidant action of flavonoids may be the main factor in their cytotoxicity, the hydroxylation and oxidative demethylation by cytochromes P-450 and O-methylation by catechol-O-methyltransferase can significantly modulate the cytotoxicity of the parent compounds.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Probiotics, prebiotics and antioxidants as functional foods
Autorzy:: Grajek, Włodzimierz
Olejnik, Anna
Sip, Anna
Tematy:: probiotics
prebiotics
antioxidants
functional food; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1041373.pdf Link otwiera się w nowym oknie
Opis:: The term "functional foods" comprises some bacterial strains and products of plant and animal origin containing physiologically active compounds beneficial for human health and reducing the risk of chronic diseases. Among the best known functional compounds probiotics, prebiotics and natural antioxidants should be given as examples. These substances can be obtained by biotechnological methods and by extraction from plant or animal tissues.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Superowoce i ich właściwości
Superfruits and their properties
Autorzy:: Sienkiewicz, Jolanta Joanna
Góralczyk, Justyna
Tematy:: superowoce
antyoksydanty
açai
superfruits
antioxidants; Pokaż więcej
Wydawca:: Ostrołęckie Towarzystwo Naukowe
Powiązania:: https://bibliotekanauki.pl/articles/2165199.pdf Link otwiera się w nowym oknie
Opis:: Określenie superfruit po raz pierwszy pojawiło się w Ameryce na przełomie lat 2004/2005. Autorzy Steven Pratt i Kathy Mathews w artykule SuperFoods Rx – Fourteen Foods That Will Change Your Life opisali 14 produktów o szczególnych korzyściach zdrowotnych, dając w ten sposób początek nowej gałęzi badań naukowych, których celem stało się zgłębianie wiedzy na temat superowoców. Superowoce powinny zawierać dużą ilość przeciwutleniaczy, witamin, błonnika, minerałów, wyróżniać się egzotycznym pochodzeniem i smakiem, a także przyciągać ciekawym wyglądem. Ponadto superowoce muszą charakteryzować się właściwościami prozdrowotnymi popartymi badaniami naukowymi. Do superowoców należą m.in. – açai, borówka amerykańska, żurawina, goji, czerwone winogrona, guarana, mangostan, granat, noni, papaja, mango, rokitnik, acerola.
The term superfruit first appeared in America at the turn of 2004/05. Authors Steven Pratt and Kathy Matthews in Superfoods Rx – Fourteen Foods That Will Change Your Life described the 14 products with specific health benefits, thus giving rise to a new branch of research, the goal was to gain greater knowledge of superfruits. Superfruits should contain a large amount of antioxidants, vitamins, fiber, minerals, stand out and taste the exotic origin, as well as to attract curious looks. In addition superfruits must be tailored evidence-based health-related. The superfruits include, among others – acai, blueberry, cranberry, goji, red grapes, guarana, mangosteen, pomegranate, noni, papaya, mango, sea buckthorn, acerola.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Serum antioxidant parameters in patients poisoned by different xenobiotics
Autorzy:: Gomółka, Ewa
Zagrodzki, Paweł
Hydzik, Piotr
Krośniak, Mirosław
Francik, Renata
Eker, Ebru Derici
Opis:: There is a great diversity of the acute drugs overdose cases in clinical toxicology. Clinical situation is complicated by the coexistence of factors predisposing to the development o f adverse drug reactions (chronic use of drugs, polypharmacy, alcohol or drugs dependence, nutritional disorders) and by the presence of chronic organ damage, especially the liver and the kidney. The aim of this study w as to evaluate whether there are sensitive plasma markers belonging to the antioxidant system in patients exposed to various xenobiotics. We measured the activity of antioxidant parameters: catalase (CAT), glutathione peroxidase (GPX3), glutathione (GSH), sulfhydryl groups (-SH), carbonyl groups (=CO) and free radicals (2,2-diphenyl-1-picrylhydrazyl, DPPH, assay) in serum of 49 patients with acute intoxication caused by carbamazepine (CBZ, n = 9), mixed drug intoxication (MDI) (n = 9), alcohol withdrawal syndrome (AWS, n = 9), acetaminophen (APAP, n = 7), tricyclic antidepressants (TCAs) (n = 5), valproic acids (VA, n = 4), narcotics (N, n = 3), and three others (benzodiazepines, BZD, n = 2; barbiturates, n = 1). The results were compared w ith the parameters of not intoxicated patients (n = 39). All patients had lower catalase activity in comparison to the control group (41.9 ± 16.5 vs. 196.0 ± 82.2 U/mg protein, p = 0.000), while the increase of GSH level was particularly apparent only in patients with AWS (391.3 ± 257.9 pmol/mg protein) compared to the control group (171.4 ± 88.4 pmol/mg protein, p = 0.034) and to patients intoxicated with carbamazepine (152.8 ± 102.5 pmol/mg protein, p = 0.027). Some differences, but without statistical significance, were also observed in GPX3 activity between different groups of poisoned patients.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 9.

Tytuł:: Tocopherol content and isomers composition in selected plant species
Autorzy:: Kruk, Jerzy
Szymańska, Renata
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: Przeciwutleniacze stosowane w produkcji wyrobów gumowych. Część II. Obecne kierunki badań ze szczególnym uwzględnieniem przeciwutleniaczy polimerycznych oraz przeciwutleniaczy otrzymanych z użyciem substancji pochodzenia naturalnego
Antioxidants used in production of rubber elements. Part II. Current trends with special interest in polymeric antioxidants and antioxidants synthesized using biobased substances
Autorzy:: Włoch, M.
Głowińska, E.
Ostaszewska, U.
Datta, J.
Tematy:: guma
starzenie gumy
nowoczesne przeciwutleniacze
przeciwutleniacze pochodzenia naturalnego
przeciwutleniacze polimeryczne petrochemiczne
rubber
ageing of rubber
novel antioxidants
bio-based antioxidants
polymeric petrochemical antioxidants; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Powiązania:: https://bibliotekanauki.pl/articles/272602.pdf Link otwiera się w nowym oknie
Opis:: Powszechnie wykorzystywane w przemyśle gumowym przeciwutleniacze są substancjami otrzymywanymi ze źródeł pochodzenia petrochemicznego i wykazują działanie toksyczne względem człowieka i środowiska naturalnego. Projektowanie nowoczesnych przeciwutleniaczy powinno zatem skupiać się na zminimalizowaniu wad obecnie stosowanych przeciwutleniaczy. Przedstawiona praca obejmuje przegląd literatury z lat 2000–2017 w zakresie nowoczesnych przeciwutleniaczy ze szczególnym uwzględnieniem polimerycznych przeciwutleniaczy petrochemicznych oraz przeciwutleniaczy pochodzenia naturalnego (lub zsyntezowanych z użyciem substancji pochodzenia naturalnego).
Commonly used in the rubber industry antioxidants are substances derived from petrochemical resources and possess toxicity for human and environment. Designing of novel antioxidants should be connected with the elimination of disadvantages of currently used antioxidants. Presented work contains literature review from 2000 to 2017 in the area of modern antioxidants with the special focus on the polymeric petrochemical antioxidants and bio-based antioxidants (or synthesized using bio-based substances).
Dostawca treści:: Biblioteka Nauki

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