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A comparison of methods employed to evaluate antioxidant capabilities Biol. Res.
PEREZ,DRUSO D; LEIGHTON,FEDERICO; ASPEE,ALEXIS; ALIAGA,CAROLINA; LISSI,EDUARDO.
Thrce ditferent methodologies frequently employed to evaluate the indexes that report the antioxidant capabilities of pure compounds and/or complex mixtures of antioxidants are applied to a series of mono- and polyphenols, as well as to two wine (red and white) samples. These methodologies are based on the bleaching of a stable radical, the effect of the additive upon luminol chemiluminescence induced by peroxyl radicals, and the effect of the additive upon the bleaching of the fluorescence from a dye molecule. Widely ditferent responses are obtained from the different methodologies. These differences are interpreted in terms of the different factors (stoichiametric factors and/or reactivities) that determines the indexes evaluated by these different...
Tipo: Journal article Palavras-chave: ABTS radical bleaching; Antioxidants; C-phycocyanin bleaching; Total antioxidant reactivity; Total reactive antioxidant potential.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200006
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Actividad antioxidante de algas y plantas marinas de la plataforma insular cubana OceanDocs
Valdés, O.; Hernádez, Y.; Fernández, M.D.; Hernández, I.; Rodriguez, M.; Cano, M.; Laguna, A.; Díaz, C.; Cabrera, B..
En el presente trabajo se estudia la capacidad antioxidante de varios extractos, acuosos e hidro-alcohólicos obtenidos a partir de algas y plantas marinas de la plataforma insular cubana. A todos los extractos se les determinó su contenido de polifenoles, proteínas, lípidos y azúcares totales, así como la actividad Superóxido Dismutasa (SOD). Todos los extractos evaluados mostraron una buena actividad antioxidante, con una CE50 inferior de 0,4 mg.ml-1. El contenido de polifenoles en los extractos de Ulva fasciata es menor el de las otras especies, aunque tanto el extracto hidro-alcohólico como el del alga seca e irradiada de dicha especie presentan una buena actividad antioxidante. El extracto hidro-alcohólico de Thalassia testudinum presenta el mayor...
Tipo: Journal Contribution Palavras-chave: Proteins; Antioxidants; Proteins; Antioxidants; Http://aims.fao.org/aos/agrovoc/c_6259; Http://aims.fao.org/aos/agrovoc/c_511.
Ano: 2008 URL: http://hdl.handle.net/1834/2820
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Actividad antioxidante en extractos de algas marinas OceanDocs
Fernández, M.D.; Hernández, I.; Aneiros, A.; Tello, J..
Entre otras múltiples reacciones, los radicales libres pueden interactuar con ácidos grasos de las membranas celulares y causar la destrucción oxidativa de las mismas; a este proceso es al que se le denomina lipoperoxidación (Echeverry, 1998). Como defensas frente a las agresiones de los radicales libres se presentan una serie de sistemas enzimáticos entre los que destacan la superóxido dismutasa y la catalasa. En los organismos marinos se han encontrado compuestos con actividad antioxidantes fundamentalmente en algunas especies de algas. En este trabajo se realizó la evaluación del efecto antioxidante de los extractos de 6 algas mediante los métodos de inhibición de la peroxidación lipídica, determinación de la actividad mimética superóxido dismutasa...
Tipo: Other Palavras-chave: Antioxidants; Algae; Experimental research; Antioxidants; Algae; Http://aims.fao.org/aos/agrovoc/c_511; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 2007 URL: http://hdl.handle.net/1834/2604
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Adding diphenyl diselenide in the diets of quails improves the quality of meat. Repositório Alice
ROZA, L. da F.; SILVA, A. S. da; MIGLIORINI, M. J.; BOTTARI, N. B.; GLOMBOWSKY, P.; BARETTA, M.; TAVERNARI, F. de C.; STEFANI, L. M.; BOIAGO, M. M..
Abstract: Diphenyl diselenide (Ph2Se2) is an organic selenium compound that is known for its antioxidant characteristics. Thus, the aim of this study was to evaluate whether Ph2Se2 in quail (Coturnix japonica) diets influences the oxidative/antioxidant status and meat quality. Materials and methods. Four diets (0; 0.3; 0.6; 0.9 ppm Ph2Se2) were provided to 56 male quails (Coturnix japonica) distributed in a completely randomized design with 14 repetitions in order to check whether (PhSe)2 would change their blood and tissue oxidative/antioxidant status, which would lead to an improvement in the meat quality. Results. Adding Ph2Se2 in diets led to increased antioxidant activity of enzymes such as catalase, superoxide dismutase, and glutathione peroxidase,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Selênio orgânico; Qualidade da carne; Organic selenium; Antioxidante; Antioxidants; Meat quality.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1101931
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Anthocyanin-rich extract decreases indices of lipid peroxidation and DNA damage in vitamin E-depleted rats IPB - Escola Superior Agrária
Ramirez-Tortosa, Carmen; Cabrita, Luís; Andersen, Øyvind M.; Gardner, P.T.; Morrice, P.C.; Wood, S.G.; Duthie, S.J.; Collins, A.R.; Garry, G.G..
Anthocyanins are secondary plant metabolites responsible for the blue, purple, and red color of many plant tissues. The phenolic structure of anthocyanins conveys marked antioxidant activity in model systems via donation of electrons or hydrogen atoms from hydroxyl moieties to free radicals. Dietary intakes of anthocyanins may exceed 200 mg/day, however, little is known about their antioxidant potency in vivo. Consequently, the aim of this study was to establish whether anthocyanins could act as putative antioxidant micronutrients. Rats were maintained on vitamin E-deficient diets for 12 weeks in order to enhance susceptibility to oxidative damage and then repleted with rations containing a highly purified anthocyanin-rich extract at a concentration of 1...
Tipo: Article Palavras-chave: Anthocyanins; Polyphenols; Lipid peroxides; DNA damage; Antioxidants; Free radicals.
Ano: 2001 URL: http://hdl.handle.net/10198/3368
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Antimicrobial, Antioxidant and Cytotoxic Activity of MarineStreptomyces parvulus VITJS11 Crude Extract BABT
Naine,S. Jemimah; Devi,C. Subathra; Mohanasrinivasan,V.; B,Vaishnavi.
The main aim of the study was to evaluate the bioactive properties of ethyl acetate crude extract of Streptomyces parvulus VITJS11 with a view to assess their therapeutic potential. The biological activity of ethyl acetate extract was tested against fungal and bacterial pathogens. The free radical scavenging potential of the crude extract was determined by DPPH assay. The chemo preventive properties of S. parvulus VITJS11 ethyl acetate extract was examined by MTT assay on HepG2 cells. The morphological, physiological and the biochemical properties of the strain S. parvulus VITJS11 was confirmed by conventional methods. Genotypic characterization was done using 16S r-DNA partial gene amplification and sequencing. The authenticity of the crude chemical...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Marine actinomycetes; Streptomyces parvulusVITJS11; Antimicrobial activity; Antioxidants; Cytotoxicity; Bioactive compounds.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000200198
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Anti-obesity Effects of the Administration of Tournefortia paniculata Cham Extract on Wistar Rats Subjected to a Hypercaloric Diet BABT
Simão,Anderson Assaid; Ramos,Vinicius de Oliveira; Corrêa,Angelita Duarte; Sousa,Raimundo Vicente de; Marcussi,Silvana.
The aim of this study was to evaluate the therapeutic and toxicologic effects of the administration of the powered vegetable extract and aqueous extract of Tournefortia paniculata leaves on Wistar rats, subjected to a hypercaloric diet for 42 days. The rats were divided into five groups and were given the following treatments by gavage: T0 (control) - 1.0 mL water day-1; T1 - aqueous extract containing 14 mg phenolic compounds kg-1 rat day-1; T2 - 14 mg quercetin kg-1 rat day-1; T3 - 50 mg powered vegetable extract from T. paniculata leaves (PVE) kg-1 rat day-1 and T4 - 100 mg PVE kg-1 rat day-1. The treatments did not significantly alter the weight, but were effective in reducing liver fat, glucose and serum triglycerides. The treatment T1 reduced food...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Obesity; Medicinal plants; Pharmacology; Antioxidants; Genotoxicity.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000400494
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Antioxidant activities of the extracts from chestnut flower, leaf, skins and fruit IPB - Escola Superior Agrária
Barreira, João C.M.; Ferreira, Isabel C.F.R.; Oliveira, M.B.P.P.; Pereira, J.A..
In this study, the antioxidant properties of chestnut (flowers, leaves, skins and fruits) extracts were evaluated through several biochemical assays: DPPH (2,2-diphenyl-1-picrylhydrazyl) radical-scavenging activity, reducing power, inhibition of β-carotene bleaching, inhibition of oxidative hemolysis in erythrocytes, induced by 2,2′-azobis(2-amidinopropane)dihydrochloride (AAPH), and inhibition of lipid peroxidation in pig brain tissue through the formation of thiobarbituric acid-reactive substances (TBARS). These assays have been extensively studied as models for the peroxidative damage in biomembranes. The EC50 values were calculated for all the methods in order to evaluate the antioxidant efficiency of each chestnut extract. The phenol and flavonoid...
Tipo: Article Palavras-chave: Chestnut extracts; Antioxidants; Scavenging effect; Peroxidation and hemolysis inhibition.
Ano: 2008 URL: http://hdl.handle.net/10198/741
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Antioxidant activity and bioactive compounds of ten Portuguese regional and commercial almond cultivars. IPB - Escola Superior Agrária
Barreira, João C.M.; Ferreira, Isabel C.F.R.; Oliveira, M.B.P.P.; Pereira, J.A..
The antioxidant properties of different almond cultivars (cv.), either regional (Casanova, Duro Italiano, Molar, Orelha de Mula and Pegarinhos cv.) or commercial (Ferraduel, Ferranhês, Ferrastar and Guara cv.) were evaluated through several chemical and biochemical assays: DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity, reducing power, inhibition of b-carotene bleaching, inhibition of oxidative hemolysis in erythrocytes, induced by 2,20-azobis(2-amidinopropane)dihydrochloride (AAPH), and inhibition of thiobarbituric acid reactive substances (TBARS) formation in brain cells, all used as models for the lipid peroxidation damage in biomembranes. The EC50 values were calculated for all the methods in order to evaluate the antioxidant...
Tipo: Article Palavras-chave: Almond; Antioxidants; Scavenging effect; Peroxidation; Hemolysis inhibition.
Ano: 2008 URL: http://hdl.handle.net/10198/779
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ANTIOXIDANT ACTIVITY DURING STORAGE OF APPLES SUBJECTED TO IRRADIATION Ciência e Agrotecnologia
Fante,Camila Argenta; Elias,Heloísa Helena de Siqueira; Henrique,Paôla de Castro; Boas,Ana Carolina Vilas; Lima,Luiz Carlos de Oliveira.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Postharvest; Storage; Antioxidants; Food quality.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000300269
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Antioxidant activity of bee products added to water in tebuconazole-exposed fish Neotropical Ichthyology
Ferreira,Daiane; Unfer,Taís Cristina; Rocha,Hélio Carlos; Kreutz,Luiz Carlos; Koakoski,Gessi; Barcellos,Leonardo José Gil.
An experiment was conducted to evaluate the potential of honey, propolis, and bee pollen for the reversal of lipid peroxidation induced by tebuconazole (TEB) in South American catfish (Rhamdia quelen), in which the concentration of thiobarbituric acid reactive substances (TBARS), the activity of the antioxidant enzyme glutathione-S-transferase (GST) and the concentrations of non-enzymatic antioxidants, reduced glutathione (GSH), ascorbic acid, and non-protein thiols were assessed. Honey (0.125 g L-1) and bee pollen (0.05 g L-1) added to the water reverse the production of TBARS induced by TEB, while propolis demonstrated a pro-oxidant effect, inducing an increase in TBARS production. The data presented herein suggest that the addition of water to honey and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidants; Bee pollen; Honey; Lipid peroxidation; Propolis; Tebuconazole.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000100021
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Antioxidant activity of chestnut constituents: flowers, leaves, skins and fruits IPB - Escola Superior Agrária
Barreira, João C.M.; Ferreira, Isabel C.F.R.; Oliveira, M.B.P.P.; Pereira, J.A..
In this study, the antioxidant properties of different chestnut constituents (flowers, leaves, skins and fruits) were evaluated through several biochemical assays: DPPH (2,2-diphenyl-1- picrylhydrazyl) radical scavenging activity, reducing power, inhibition of β-carotene bleaching, inhibition of oxidative hemolysis in erythrocytes, induced by 2,2’-azobis(2- amidinopropane)dihydrochloride (AAPH), and inhibition of lipid peroxidation in pig brain tissue through formation of thiobarbituric acid reactive substances (TBARS). These assays have been extensively studied as models for the peroxidative damage in biomembranes. For all the methods EC50 values were calculated in order to evaluate the antioxidant efficiency of each product. The phenol and flavonoid...
Tipo: ConferenceObject Palavras-chave: Chestnut constituents; Antioxidants; Scavenging effects; Peroxidation; Hemolysis inhibition.
Ano: 2007 URL: http://hdl.handle.net/10198/6041
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Antioxidant activity of oily extract obtained from Lippia origanoides improves the quality of bovine embryos produced in vitro Arq. Bras. Med. Vet. Zootec.
Sollecito,N.V.; Pereira,E.C.M.; Grázia,J.G.V.; Neves,B.P.; Couto,B.V.R.; Andrade,V.B.; Miranda,M.S.; Silva,J.K.R.; Borges,A.M..
ABSTRACT The aim of this study was to evaluate the supplementation of embryo culture medium with antioxidant obtained from oily extract of Lippia origanoides on in vitro blastocyst development and quality. Oocytes collected from slaughterhouse ovaries were matured and fertilized in vitro following standard laboratory procedures. Zygotes were cultured in SOF medium supplemented according to the following treatments: T1 embryo culture medium without antioxidant supplementation; T2)50μM/mL Cysteamine; T3)2.5μg/mL; T4)5.0μg/mL and T5)10.0μg/mL of antioxidant obtained from oily extract of Lippia origanoides. On the seventh day of culture, the blastocysts were fixed and evaluated for apoptosis rates, number of total cell and inner cell mass cells by means of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidants; Apoptosis; Lippia origanoides; In vitro embryo production.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000300723
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Antioxidant activity of portuguese honey samples: different contribution of the entire honey and phenolic extract IPB - Escola Superior Agrária
Ferreira, Isabel C.F.R.; Aires, Edmur; Barreira, João C.M.; Estevinho, Leticia M..
The antioxidant activity of Portuguese honeys was evaluated considering the different contribution of entire samples and phenolic extracts. Several chemical and biochemical assays were used to screen the antioxidant properties of entire honeys with different colour intensity and phenolic extracts: reducing power, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical-scavenging capacity, and inhibition of lipid peroxidation using the b-carotene linoleate model system and the thiobarbituric acid reactive substances (TBARS) assay. The amounts of phenols, flavonoids, ascorbic acid, b-carotene, lycopene and sugars present in the samples were also determined. The highest antioxidant contents and the lowest EC50 values for antioxidant activity were obtained in the dark...
Tipo: Article Palavras-chave: Honey; Antioxidants; Phenolics; Scavenging activity; Peroxidation inhibition; Discriminant analysis.
Ano: 2009 URL: http://hdl.handle.net/10198/2648
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Antioxidant, analgesic and anti-inflammatory effects of lavender essential oil Anais da ABC (AABC)
SILVA,GABRIELA L. DA; LUFT,CAROLINA; LUNARDELLI,ADROALDO; AMARAL,ROBSON H.; MELO,DENIZAR A. DA SILVA; DONADIO,MÁRCIO V.F.; NUNES,FERNANDA B.; AZAMBUJA,MARCOS S. DE; SANTANA,JOÃO C.; MORAES,CRISTINA M.B.; MELLO,RICARDO O.; CASSEL,EDUARDO; PEREIRA,MARCOS AURÉLIO DE ALMEIDA; OLIVEIRA,JARBAS R. DE.
Several studies have investigated the antinociceptive, immunomodulatory and anti-inflammatory properties of compounds found in the lavender essential oil (LEO), however to date, there is still lack of substantial data. The objective of this study was to assess the antioxidant, anti-inflammatory and antinociceptive effects of lavender essential oil. The 1,1-diphenyl-2-picrylhydrazyl radical decolorization assay was used for antioxidant activity evaluation. The anti-inflammatory activity was tested using two models of acute inflammation: carrageenan-induced pleurisy and croton oil-induced ear edema. The antinociceptive activity was tested using the pain model induced by formalin. LEO has antioxidant activity, which is dose-dependent response. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidants; Inflammation; Lavender; Nociception.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301397
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Antioxidant and prebiotic effects of a beverage composed by tropical fruits and yacon in alloxan-induced diabetic rats. Repositório Alice
DIONISIO, A. P.; CARVALHO, L. B. DE; VIEIRA, N. M.; WURLITZER, N. J.; PEREIRA, A. C. DA S.; BORGES, M. DE F.; GARRUTI, D. dos S.; ARAUJO, I. M. da S..
bitstream/item/208385/1/ART19120.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Estresse oxidativo; Oxidative estress; Diabete; Prebiotics; Tropical and subtropical fruits; Antioxidants; Diabetes.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1118405
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Antioxidant and prebiotic effects of a beverage composed by tropical fruits and yacon in alloxan-induced diabetic rats Ciênc. Tecnol. Aliment.
DIONISIO,Ana Paula; CARVALHO-SILVA,Luciano Bruno de; VIEIRA,Nara Menezes; WURLITZER,Nedio Jair; PEREIRA,Ana Carolina da Silva; BORGES,Maria de Fatima; GARRUTI,Deborah dos Santos; ARAÚJO,Idila dos Santos.
Abstract The aim of this study was to evaluate the antioxidant and prebiotic effect of a beverage composed by tropical fruits and yacon in alloxan-induced diabetic rats. To obtain the beverage, a Response Surface Methodology was used, with concentration of yacon extract (x1) and the sweetener (x2) added to a mixture of tropical fruits as independent variables, and the sensorial acceptance as response. The optimized beverage showed higher values for antioxidant capacity, measured by ABTS, FRAP and DPPH assays. Thus, the fructooligosaccharides content (2.32 ± 0.65 g FOS/100 g), total phenolic (126.83 ± 9.48 mg gallic acid equivalent/100 g) and ascorbic acid (171.64 ± 7.31 mg/100 g) shows that the beverage contains high levels of these bioactive compounds. In...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diabetes; Oxidative estress; Antioxidants; Tropical fruits; Prebiotics.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019005031127
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ANTIOXIDANT CAPACITY OF PEQUI (Caryocar brasiliense Camb.) PULP IS PRESERVED BY FREEZE-DRYING AND LIGHT-RESISTANT PACKAGING Rev. Bras. Frutic.
NASCIMENTO,NARA RÚBIA RODRIGUES DO; ALVES,ALINE MEDEIROS; SILVA,MARA REIS; NAVES,MARIA MARGARETH VELOSO.
ABSTRACT Pequi (Caryocar brasiliense Camb.) pulp is rich in bioactive compounds. However, seasonality and perishability limit its availability in the market. This work aimed to determine the physicochemical characteristics, including phenolic compounds and carotenoid concentrations, as well as the antioxidant capacity of lyophilized pequi pulp during storage in various packaging materials for 180 days. Pequi fruits were pulped, ground, freeze-dried and then vacuum packaged in transparent polyethylene (TP), polyethylene coated by aluminum foil (PA) and laminated foil (LA), respectively. The samples were stored under controlled temperature, humidity and luminosity. Proximate composition, phenolic compounds and carotenoids concentrations, and antioxidant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidants; Carotenoids; Caryocar brasiliense; Cerrado; Pequi.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000100901
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Antioxidant potential of various solvent extract from Morus alba fruits and its major polyphenols composition Ciência Rural
Kobus-Cisowska,Joanna; Szczepaniak,Oskar; Szymanowska-Powałowska,Daria; Piechocka,Justyna; Szulc,Piotr; Dziedziński,Marcin.
ABSTRACT: Extraction conditions are an important factor in the process of obtaining bioactive compounds from plant matrix. These compounds differ structurally. Structures of phyto-compounds and their interactions with other food ingredient are not fully known, while these two aspects should play a significant role in extrahents choice and determination of extraction process conditions. Mulberry (Morus alba) is a plant growing in Asia, which fruits are rich in bioactive ingredients and high anti-oxidative potential. In our study we analyzed mulberry fruits extracts differing in the extra hent applied: acetone, methanol, ethanol and water. All tested extracts possessed rich polyphenolic composition and radical scavenging ability. The significant differences...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Morus alba; Antioxidants; Phenolic acids; Flavonoids.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000100751
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Antioxidants and sensory properties of the infusions of wild passiflora from Brazilian savannah: potential as functional beverages. Repositório Alice
PINELI, L. de L. de O.; RODRIGUES, J. da S. Q.; COSTA, A. M.; LIMA, H. C. de; CHIARELLO, M. D.; MELO, L..
Abstract: BACKGROUND: The study of biodiversity for species recovery and sustainable use has encouraged research with plants from Brazilian savannah. We aimed to characterize chemical and sensory properties of infusions of passifloras, due to their potential as functional beverages. Infusions and hydroalcoholic extracts of four species of wild passifloras, three varieties of Passiflora edulis and a commercial passiflora tea were evaluated for total phenolics (TPs), total flavonoids (TFs), condensed tannins (CTs), and antioxidant activity (DPPH and FRAP). Free-choice Profile and acceptance, compared with green tea, were performed for sensory characterization. RESULTS: In general, infusions had higher levels of TPs and CTs than hydroalcoholic extracts, which...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Infusões; Maracujá; Composto fenólico; Antioxidante; Analise organoleptica; Cerrado; Passion fruits; Phenolic compounds; Antioxidants; Sensory evaluation; Savannas; Brazil.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1039283
Registros recuperados: 163
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