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2-Styrylchromones: novel strong scavengers of reactive oxygen and nitrogen species IPB - Escola Superior Agrária
Gomes, Ana; Fernandes, Eduarda; Silva, Artur; Pinto, Diana; Santos, Clementina M.M.; Cavaleiro, José; Lima, José Costa.
2-Styrylchromones are a small group of naturally occurring chromones, vinylogues of flavones (2-phenylchromones). Natural and synthetic 2-styrylchromones have been tested in different biological systems, showing activities with potential therapeutic applications. In particular, the potential and hitherto understudied antioxidant behavior of these compounds has been raised as a matter of interest. Thus the present work consisted in the study of the in vitro scavenging activities for reactive oxygen species (ROS) and reactive nitrogen species (RNS) of various 2-styrylchromone derivatives and structurally similar flavonoids. Some of the studied 2-styrylchromones proved to be extremely efficient scavengers of the different ROS and RNS, showing, in some cases,...
Tipo: Article Palavras-chave: 2-Styrylchromones; Reactive oxygen species; Reactive nitrogen species; Scavenging activity; Antioxidant activity.
Ano: 2007 URL: http://hdl.handle.net/10198/3922
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A comparative study of tocopherols composition and antioxidant properties of in vivo and in vitro ectomycorrhizal fungi IPB - Escola Superior Agrária
Reis, Filipa S.; Ferreira, Isabel C.F.R.; Barros, Lillian; Martins, Anabela.
In aerobic organisms, the free radicals are constantly being produced during the normal cellular metabolism. The antioxidant properties of many organisms and particularly of wild mushrooms with their content in antioxidant compounds such as tocopherols, can detoxify potentially damaging forms of activated oxygen. Herein, a comparative study of tocopherols composition and antioxidant properties of in vivo (fruiting bodies) and in vitro (mycelia) ectomycorrhizal fungi: Paxillus involutus and Pisolithus arhizus. Tocopherols were determined by high performance liquid chromatography (HPLC) coupled to a fluorescence detector. The antioxidant properties were studied in terms of DPPH radical-scavenging activity, reducing power and inhibition of β-carotene...
Tipo: Article Palavras-chave: Paxillus involutus; Pisolithus arhizus; Fruiting bodies/mycelia; Tocopherols; HPLC-fluorescence; Antioxidant activity.
Ano: 2011 URL: http://hdl.handle.net/10198/3880
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A comparative study on antioxidant activity of different parts of lotus (Nelumbo nuficera Gaertn) rhizome Ciênc. Tecnol. Aliment.
YANG,Dongmei; ZHANG,Qian; REN,Guoping; YING,Tiejin.
Abstract In this study, the antioxidant activities of different parts of lotus (Nelumbo nuficera Gaertn) rhizome were compared. The total phenolic content of lotus rhizome was determined, and Ferric reducing antioxidant power (FRAP) assay, 1,1-diphenyl-2-picrylhydrazyl hydrate (DPPH) radical-scavenging assay and β-carotene-linoleic acid assay were performed to assess the antioxidant activity of lotus rhizome. Results showed that there was a significant difference in total phenolic content and antioxidant activity between any two of four parts of lotus rhizome. The order of total phenolic content and antioxidant activity in different parts of lotus rhizome was as follows: peel of old lotus rhizome > peel of young lotus rhizome > flesh of old lotus...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lotus rhizome; Antioxidant activity; FRAP; DPPH; Β-carotene bleaching assay.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612017000100135
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A comparison of dual-functional whey hydrolysates by the use of commercial proteases Ciênc. Tecnol. Aliment.
ROSA,Luísa Ozorio Lopes da; SANTANA,Marcelo Cerutti; AVEZEDO,Tatiana Lima; BRÍGIDA,Ana Iraidy Santa; GODOY,Ronoel; PACHECO,Sidney; MELLINGER-SILVA,Caroline; CABRAL,Lourdes Maria Correa.
Abstract Whey is well-known for the functional and bioactive properties of its proteins and peptides, which are of great interest to food and nutraceutical industries. The aim of this study was to investigate the effect of four different commercial proteases (Novo ProD® (NPD), Alcalase® (ALC), Pancreas Trypsin® (TRY), and Flavourzyme® (FLA)) in the generation of hydrolysates with emulsifying and antioxidant activities. Hydrolysis processes were carried out for 5 h, reaching maximum degrees of 18.5, 15.5, 9.2, and 8.7% for NPD, ALC, TRY, and FLA, respectively. All tested enzymes generated very diverse, but conservative peptide profiles when comparing the treatments along the time, with the main enzymatic actions up to 120 min-reaction. An increase in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Whey protein; Hydrolysis; Functionality; Emulsification; Antioxidant activity.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000500031
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A Proposal of process conditions for obtaining black soymilk. Repositório Alice
ESTEVES, T.; FELBERG, I.; FARIA-MACHADO, A.; GODOY, R.; SANTIAGO, M.; PACHECO, S.; CALADO, V.; CARRÃO-PANIZZI, M. C..
2016
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Black soybean; Soymilk processing; Antioxidant activity; Anthocyanins; Isoflavones; Alimento vegetal; Antioxidante; Leite de soja; Tecnologia de alimento; Soja; Plant-based foods; Antioxidant activity; Soymilk; Soybeans; Soybean products; Food technology.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1052964
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A QCAR model for predicting antioxidant activity of wild mushrooms IPB - Escola Superior Agrária
Froufe, Hugo J.C.; Abreu, Rui M.V.; Ferreira, Isabel C.F.R..
Wild mushrooms have been described as sources of natural antioxidants, particularly phenolic compounds. However, many other compounds present in wild mushrooms can also act as antioxidants (reducers), so whole extracts from a wide range of species need to be examined. To gain further knowledge in this area, the relationship between the antioxidant potential (scavenging effect and reducing power) and chemical composition of twenty three samples from seventeen Portuguese wild mushroom species was investigated. A wide range of analytical parameters reported by our research group (including ash, carbohydrates, proteins, fat, monounsaturated fatty acids, polyunsaturated fatty acids, saturated fatty acids, phenolics, flavonoids, ascorbic acid and -carotene)...
Tipo: Article Palavras-chave: Wild mushrooms; Chemical composition; Antioxidant activity; QCAR; PLS.
Ano: 2009 URL: http://hdl.handle.net/10198/2615
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A study of fortification of lemonade with herbal extracts Ciênc. Tecnol. Aliment.
TAMER,Canan Ece; YEKELER,Fatma Zehra; ÇOPUR,Ömer Utku; İNCEDAYI,Bige; SUNA,Senem.
Abstract The aim of the present work was to design new beverages using lemonade and some herbal extracts (linden, heather, green tea, lemon verbena, clove, peppermint, ginger and mate) rich in vitamin C and flavonoids. The linden-added lemonade showed the highest value (597.9 mg/kg) for ascorbic acid content, whereas the lemon verbena-added lemonade showed the lowest value (486.04 mg/kg). The amount of saccharose was changed by 11.07-11.58%, the glucose by 1.11-1.62% and the fructose between 11.07-11.58% in the beverages. K, Na, Mg and P values in the lemonades were determined in the range of 178.83-210.98 mg/kg, 33.75-39.13 mg/kg, 22.37-27.89 mg/kg and 7.22-10.04 mg/kg, respectively. The total phenolic content in the samples changed between 315.11-397.57...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lemonade; Beverage; Herbal extract; Antioxidant activity.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612017000100045
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Agro-industrial wastes as sources of bioactive compounds for food and fermentation industries Ciência Rural
Shirahigue,Ligianne Din; Ceccato-Antonini,Sandra Regina.
ABSTRACT: Agro-industrial wastes are of great interest because they are important natural sources of bioactive compounds and can generate value-added byproducts. Recent studies have shown that byproducts generated by the food processing industry are rich in bioactive compounds, such as phenolic compounds, organic acids, and carotenoids, among others. The growing interest in replacing synthetic antioxidant and antimicrobial compounds with natural ones has stimulated a search for these bioactive compounds from plant sources, especially from fruit-processing wastes. The study aims to project the agro-industrial wastes as potential natural sources of antioxidants and antimicrobials and the feasible technological applications in food and fermentation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phenolic compounds; Antioxidant activity; Antimicrobial activity; Agro-industrial waste.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000400754
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Análise térmica de amidos de cará-moela incorporados com extratos aquosos de erva-mate (Ilex paraguariensis). Repositório Alice
WOLFF, S. M.; SILVEIRA, A. C. da; LAZZAROTTO, M..
O amido de Dioscorea bulbifera Linn, espécie conhecida também como cará moela, é um carboidrato pouco estudado. No entanto, a incorporação de extratos de erva-mate (Ilex paraguariensis) podem adicionar propriedades que agreguem valor ao produto. Este trabalho buscou adicionar extratos aquosos de erva-mate ao amido de D. bulbifera e avaliar os efeitos nas propriedades térmicas e reológicas. Assim, o amido nativo de D. bulbifera foi obtido e tratados com extrato aquosos de erva-mate em concentrações de 1,5%, 3% e 6%. Nas curvas TG, em atmosfera de ar sintético, dois eventos foram observados, no entanto a estabilidade e as propriedades térmicas do amido não foram alteradas significativamente. As temperaturas iniciais de gelatinização dos amidos incorporados...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Erva mate; Composto bioativo; TG-DSC; RVA; Ilex Paraguariensis; Composto Fenólico; Antioxidante; Phenolic compounds; Bioactive compounds; Antioxidant activity.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1115122
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Analysis of Maceaene and Macamide Contents of Petroleum Ether Extract of Black, Yellow, and Purple Lepidium Meyenii (Maca) and Their Antioxidant Effect on Diabetes Mellitus Rat Model BABT
Qiu,Congyang; Zhu,Tonglin; Lan,Liying; Zeng,Qingmao; Du,Zhiguo.
ABSTRACT Maceaene and macamide contents as well as antioxidant effect of petroleum ether extract of black maca (BM), yellow maca (YM), and purple maca (PM) on diabetes mellitus (DM) rats were investigated. The results showed that seven, six, and five analogues of macamides were identified from the petroleum ether extracts of BM, YM, and PM, respectively. BM extract exhibited the highest contents of total macamides. Comparatively, the PM extract has the lowest macamide quantity. The maceaene contents in all the extracts showed no significant difference (p>0.05). Macamide contents in maca with the same color were not statistically different. Pharmacological results showed that 60-day oral administration of the petroleum ether extract of maca (100 mg/kg.d)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Maca extract; Antioxidant activity; Maceaene; Macamide; Diabetes mellitus rat.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100326
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Annual Variations in the Anthocyanin Contents of Blueberry Fruit Grown in Hokkaido OAK
宮下, 淳一; 西, 繁典; 齋藤, 優介; 小疇, 浩; 弘中, 和憲; 小嶋, 道之.
アントシアニンを多く含有する果物は、健康機能性や色素作用により、非常に高く評価されている。2003 年の冷害年を含む2002~2004 年の摘期に収穫された6 品種の粒大の異なるブルーベリー果実を用いて、それらに含まれるアントシアニン含量を比較検討した。収穫年度により、果実重量あたりのアントシアニン含量は顕著に異なっていた。また、小~中粒果実 (ウェイマウス、ノースランド、ジューン、パトリオット)のアントシアニン含量は、栽培環境に影響を受けにくいが、大粒果実 (ハーバート、ブルーレイ)のそれは栽培環境に影響を受け易いことが示唆された。特に冷害年である2003年のノースランド果実のアントシアニンおよびポリフェノール含量は、他年度のそれらよりも顕著に高く、低温環境においてアントシアニン合成が増加する特徴を持っていると推定された。また、2004年、5 月と6 月の平均気温が長沼町よりも若干低い砂原町で生育したブルーベリー果実の粒大は小さかったが、果実100g 当りのアントシアニン量は高かった。今後、粒大が大きく、アントシアニン含量の高い品種の選抜・育成が期待される。
Palavras-chave: ブルーベリー; 品種選抜; アントシアニン; ポリフェノール; Blueberry; Anthocyanin; Variety selection; Antioxidant activity; Polyphenol; 抗酸化活性.
Ano: 2007 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1607
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Anthocyanins, pigment stability and antioxidant activity in jabuticaba [Myrciaria cauliflora (Mart.) O. Berg] Rev. Bras. Frutic.
Lima,Annete de Jesus Boari; Corrêa,Angelita Duarte; Saczk,Adelir Aparecida; Martins,Mariana Pereira; Castilho,Rachel Oliveira.
Different solvents were evaluated for the extraction of jabuticaba anthocyanin pigments, identifying, quantifying and verifying the stability of the anthocyanins, as well as the conduction of three antioxidant activity assays and determination of the vitamin C levels. The maceration with ethanol acidified with HCl 1.5 mol L-1 (85:15) provides better pigment extraction and stability. The skin is anthocyanin rich, presenting 1.59 and 2.06 g 100 g-1 of dry matter in the Paulista and Sabará varieties, respectively. Cyanidin 3-glucoside is the majority pigment of the skins, followed by delphinidin 3-glucoside. The highest level of vitamin C was found in the skins and seeds of both varieties. It was verified that the skins, presented more antioxidant activity,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Jabuticaba; Anthocyanin; Method of extraction; Vitamin C; Antioxidant activity.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000300023
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Antibacterial and Antioxidant Activities of Acid and Bile Resistant Strains of Lactobacillus fermentum Isolated from Miang BJM
Klayraung,Srikanjana; Okonogi,Siriporn.
Miang is a kind of traditional fermented tea leaves, widely consumed in northern Thailand as a snack. It contains several kinds of Lactobacilli spp. The aim of this study was to isolate strains of Lactobacillus fermentum from miang and to investigate their antibacterial and antioxidant activities. The agar spot and well assays were used for determination of antibacterial power. The antibacterial mechanism was investigated by cell morphologic change under scanning electron microscope (SEM). Antioxidant activity was studied by means of free radical scavenging and ferric reducing power assays. The acid and bile screening tests indicated that L. fermentum FTL2311 and L. fermentum FTL10BR presented antibacterial activity against several pathogenic bacteria:...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lactobacillus fermentum; Miang; Bile resistance; Antibacterial activity; Antioxidant activity.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000400005
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Antibiofilm, Antioxidant, Antimutagenic Activities and Phenolic Compounds of Allium orientale BOISS. BABT
Ceylan,Ozgur; Alıc,Halime.
ABSTRACT This is the first study to investigate the antibiofilm, antioxidant and antimutagenic activities and phenolic compounds of Allium orientale. Antimicrobial activity of ethanolic extracts of A. orientale was determined by a broth microdilution method. Antibiofilm activity was evaluated by microplate biofilm assay. The antioxidant activity was determined using three complementary assays; namely, DPPH scavenging, β-carotene-linoleic acid, and total phenolic compounds assays. Phenolic compounds were evaluated by reverse-phase high-performance liquid chromatography. The antimutagenic effect of extracts was analyzed by the Ames test. In RP-HPLC analysis, (+)-catechin, apigenin and caffeic acid were identified as major phenolic compounds in the aerial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allium orientale; Antibiofilm activity; Antimutagenic activity; Antioxidant activity; Phenolic compounds.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000600935
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Antioxidant activities and lutein content of 11 marigold cultivars (Tagetes spp.) grown in Thailand Ciênc. Tecnol. Aliment.
Ingkasupart,Pajaree; Manochai,Benya; Song,Woo Tae; Hong,Jeong Hwa.
Antioxidant activities and total phenolic content (TPC) were analyzed in ethanol extracts of 11 marigold cultivars grown in Thailand. Antioxidant activity assays performed in this study were the 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical cation scavenging activity, ferric ion reducing antioxidant power (FRAP), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, oxygen radical absorbance activity (ORAC), and superoxide anion radical scavenging activity (SRSA) assays. ‘Optiva Orange’ showed the best activity in the ORAC assay and in % SRSA, as well as the highest content of lutein (20.59 mg), gallic acid (25.77 mg), and quercetin (12.61 mg) per gram dry marigold petal among the 11 cultivars. Furthermore, ‘Optiva...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Marigold cultivars; Antioxidant activity; Phytochemical.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000200380
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Antioxidant activities of fractions from longan pericarps Ciênc. Tecnol. Aliment.
Yang,Xuena; Yan,Fen; Huang,Shangrong; Fu,Caili.
The antioxidant activities of ethanolic crude extract (LPCE) and its four different solvent sub-fractions (namely, diethyl ether fraction (LPDF), ethyl acetate fraction (LPEF), n-butyl alcohol fraction (LPBF) and residue fraction (LPR)) from longan pericarps were investigated employing various systems including 2,2-diphenyl-1-picrylhydrazyl (DPPH)/ 2,2'-amino-di(2-ethyl-benzothiazoline sulphonic acid-6)ammonium salt (ABTS)/hydroxyl radical scavenging activity, total phenolic content and reducing power. Each extract showed concentration-dependent antioxidant activity. LPEF showed the highest scavenging activity against DPPH, ABTS and hydroxyl radicals with EC50 values of 0.506, 0.228 and 4.489 mg/mL, respectively. LPEF showed the highest reducing power with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Longan pericarp; Extract; Free radicals; Antioxidant activity.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612014000200018
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Antioxidant activity and phenolic contents of Olea europaea L. leaves sprayed with different copper formulations IPB - Escola Superior Agrária
Ferreira, Isabel C.F.R.; Barros, Lillian; Soares, Maria Elisa; Bastos, Maria de Lourdes; Pereira, J.A..
Olive trees (Olea europaea L. Cv. Cobranc¸osa) from the northeast of Portugal were sprayed with three different copper formulations [bordeaux mixture (copper sulphate + calcium hydroxide - 20% Cu), copper hydroxide (40% Cu) and copper oxychloride (50% Cu)] to control olive fungal diseases. The residues of copper in olive leaves, harvested at different times, were evaluated by atomic absorption spectrometry. At all the collection times, treated olive leaves had significantly higher copper contents, compared to the control. The different copper amounts in pesticide formulations lowered the leaves contents in total phenols and hence their antioxidant properties. Olive leaves sprayed with copper oxychloride possessed the highest copper levels and the lowest...
Tipo: Article Palavras-chave: Olea europaea; Olive leaves; Copper; Phenols; Antioxidant activity.
Ano: 2007 URL: http://hdl.handle.net/10198/749
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Antioxidant activity in vivo and in vitro of Halimeda incrassata aqueous extracts Ciênc. Tecnol. Aliment.
Rivero,F.; Fallarero,A.; Castañeda,O.; Dajas,F.; Manta,E.; Areces,F.; Mancini Filho,J.; Vidal,A..
The aim of the present paper was to provide the evidences for the antioxidant activity in Halimeda incrassata (Ellis) Lamouroux aqueous extracts obtained after simple water extraction of the fresh algae at room temperature (23°C). Previously in the literature, only antioxidant activity associated to carotenoids fractions of seaweeds has been reported. From different species of seaweeds, Halimeda incrassata aqueous extract exhibited the highest antioxidant activity on the inhibition of TBARS formed during the spontaneous lipid peroxidation of rat brain homogenates with an IC50 of 0.340mg.mL-1. Halimeda incrassata aqueous extract (0.5mg.mL-1), was also capable of decreasing the in vitro generation of hydrogen peroxide by two distinct metabolic pathways...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant activity; Halimeda incrassata; Algae; Functional food.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612003000200026
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Antioxidant activity of Agaricus brasiliensis basidiocarps on different maturation phases BJM
Mourão,Francielly; Umeo,Suzana Harue; Takemura,Orlando Seiko; Linde,Giani Andrea; Colauto,Nelson Barros.
Different maturation phases of basidiocarp could affect the bioactivity and concentration of some active substances. A. brasiliensis Wasser et al.(A. blazei Murrill) has shown antitumor activity that could be related to the antioxidant activity. However there is no information of the best basidiocarp maturation phase for extracting antioxidant substances in order to determine the moment of harvesting in mushroom cultivation. The objective of this work was to evaluate the antioxidant activity of A. brasiliensis strains on different basidiocarp maturation phases. The best condition for extraction of A. brasiliensis antioxidants is with methanol as solvent at 60 ºC for 60 min. Strains with closed basidiocarp have higher antioxidant activity than with opened...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Absorbance; Antioxidant activity; Basidiomycete; Agaricus blazei; DPPH.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100024
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Antioxidant activity of extract from Polygonum aviculare L. Biol. Res.
HSU,CHIN-YUAN.
Free radicals induce numerous diseases by lipid peroxidation, protein peroxidation, and DNA damage. It has been reported that numerous plant extracts have antioxidant activities to scavenge free radicals. Whether Polygonum aviculare L. (Polygonaceae) has antioxidant activity is unknown. In this study, dried Polygonum aviculare L. was extracted by ethanol, and the extract was lyophilized. The antioxidant activities of extract powder were examined by free radical scavenging assays, superoxide radical scavenging assays, lipid peroxidation assays and hydroxyl radical-induced DNA strand scission assays. The results show that the IC50 value of Polygonum aviculare L. extract is 50 µg/ml in free radical scavenging assays, 0.8 µg/ml in superoxide radical scavenging...
Tipo: Journal article Palavras-chave: Antioxidant activity; Free radical; Phenolics; Lipid peroxidation; DNA damage Polygonum aviculare L.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200010
Registros recuperados: 232
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