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Registros recuperados: 77
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A novel procedure to measure the antioxidant capacity of Yerba maté extracts Ciênc. Tecnol. Aliment.
Hartwig,Vanessa Graciela; Brumovsky,Luis Alberto; Fretes,Raquel María; Boado,Lucila Sánchez.
Yerba maté extracts have in vitro antioxidant capacity attributed to the presence of polyphenolic compounds, mainly chlorogenic acids and dicaffeoylquinic acid derivatives. DPPH is one of the most used assays to measure the antioxidant capacity of pure compounds and plant extracts. It is difficult to compare the results between studies because this assay is applied in too many different conditions by the different research groups. Thus, in order to assess the antioxidant capacity of yerba maté extracts, the following procedure is proposed: 100 µL of an aqueous dilution of the extracts is mixed in duplicate with 3.0 mL of a DPPH 'work solution in absolute methanol (100 µM.L-1), with an incubation time of 120 minutes in darkness at 37 ± 1 °C, and then...
Tipo: Info:eu-repo/semantics/article Palavras-chave: DPPH; Yerba maté; Antioxidant capacity; Ilex paraguariensis.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000100019
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Accumulation of Antioxidants in Apricot Fruit through Ripening: Characterization of a Genotype with Enhanced Functional Properties Biol. Res.
Hegedüs,Attila; Pfeiffer,Péter; Papp,Nóra; Abrankó,László; Blázovics,Anna; Pedryc,Andrzej; Stefanovits-Bányai,Éva.
Two apricot genotypes, 'Gonci magyarkajszi' and 'Preventa' were assayed at three ripening stages for flesh color indices (L*, a*, b*, C* and Hº), contents of total phenolics and vitamin C, and both water- and lipid-soluble antioxidant capacities (ferric reducing antioxidant power; 2,2'-diphenyl-1-picrylhydrazyl scavenging activity; total radical scavenging activity; and Photochem lipid-soluble antioxidant capacity) to compare their dynamics in the accumulation of antioxidant compounds and capacities through ripening. The increase in a*, b* and C* and decrease in Hº during ripening represented a color shift from green to yellow and orange due to carotenoid accumulation. Parallel to carotenoid accumulation, contents of total phenolics and vitamin C and...
Tipo: Journal article Palavras-chave: Antioxidant capacity; Apricot; Color; Ripening; Total polyphenolic content; Vitamin C.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000400004
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Acerola and cashew apple as sources of antioxidants and dietary fibre. Repositório Alice
RUFINO, M. do S. M.; PÉREZ-JIMÉNES, J.; TABERNERO, M.; ALVES, R. E.; BRITO, E. S. de; SAURA-CALIXTO, F..
2010
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Anacardium occidentale; Antioxidant capacity; Dietary fibre; Malpighia emarginata; Polyphenols.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/880807
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Anchusa italica extract: phytochemical and neuroprotective evaluation on global cerebral ischemia and reperfusion BJPS
Torki,Akram; Khalaji-Pirbalouty,Valiallah; Lorigooini,Zahra; Rafieian-Kopaei,Mahmoud; Sadeghimanesh,Arezo; Rabiei,Zahra.
Abstract Stroke is the third leading cause of mortality and disability in industrial countries. Treatment with herbs with antioxidant properties has been reported to be an alternative to the conventional treatments. This study was conducted to investigate the effect of Anchusa italica extract on hippocampal injury induced by transient global cerebral ischemia and reperfusion in the rat. To do so, 50 rats were randomly assigned to five groups; control, sham, ischemia, and 50 or 100 mg/kg of Anchusa italica treated animals. Ischemia was induced by occlusion of carotid artery for 30 minutes. Afterward, behavioral tests and biochemical analyses were conducted. Induction of ischemia/reperfusion caused a decline in learning and passive avoidance memory in rats....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Boraginaceae/phytochemistry; Brain ischemia; Spatial memory/drug effects; Malondialdehyde/pharmacology; Neuroprotection/drug effects; Lipidic peroxidation/drug effects; Antioxidant capacity; Passive avoidance memory..
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502018000100613
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Andean blueberry (Vaccinium floribundum) bread: physicochemical properties and bioaccessibility of antioxidants Ciênc. Tecnol. Aliment.
GUIJARRO-FUERTES,Michelle; ANDRADE-CUVI,Maria Jose; BRAVO-VÁSQUEZ,Juan; RAMOS-GUERRERO,Luis; VERNAZA,Maria Gabriela.
Abstract The Andean Blueberry (Vaccinium floribundum) is a fruit with a recognized antioxidant capacity. Its consumption is limited to typical food in the Andean Ecuadorian zones. In this study, the effect of the addition of Andean blueberry (AB) pulp on loaf bread quality was determined. The specific volume was affected by the low fermentation rate due to the acidic pH of the fruit. The texture profile measurement demonstrated a product with harder consistency, due to the low number and circularity of the alveoli. Higher air retention in the crumb was also found. Simulated Gastrointestinal conditions directly affected the antioxidant capacity of the AB, producing a reduction of 96.9%. On the other hand, the AB bread initially presented a value of 37 μM...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anthocyanins; Baking process; In vitro digestion; Antioxidant capacity.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000500056
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Antioxidant Capacity and Acute Testicular Toxicity of Leucaena leucocephala Aqueous Shoot Tips Plus Young Leaves Extracts International Journal of Morphology
Burawat,Jaturon; Uabandit,Nongnut; Sripanidkulchai,Bungorn; Nualkaew,Somsak; Iamsaard,Sitthichai.
This study aimed to determine the antioxidant capacity of the Leucaena leucocephala aqueous shoot tips plus young leaves (LL-spl) extracts among three different fractions (LL-spl 10, 20, and 40 min) and to examine its acute toxicity on male reproductive parameters. The amount of the total phenolics in LL-spl extract was determined using a Folin-Ciocalteu reagent method and its antioxidant capacity was analyzed using 1, 1-diphenyl l-2-picrylhydrazyl radical scavenging and ferric reducing antioxidant powder methods. The LL-spl extract fraction with highest antioxidant capacity was used in animal treating. Male rats were divided into three groups (n= 5); control and groups treated with LL-spl 400 and 600 mg/Kg body weight for consecutive 40 days. The results...
Tipo: Journal article Palavras-chave: Leucaena leucocephala; Shoot tips plus young leaves; Antioxidant capacity; Acute testicular toxicity.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200018
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Antioxidant capacity and chemical composition in seeds rich in omega-3: chia, flax, and perilla Ciênc. Tecnol. Aliment.
Sargi,Sheisa Cyléia; Silva,Beatriz Costa; Santos,Hevelyse Munise Celestino; Montanher,Paula Fernandes; Boeing,Joana Schuelter; Santos Júnior,Oscar Oliveira; Souza,Nilson Evelázio; Visentainer,Jesuí Vergílio.
The chemical composition and antioxidant capacity of five seeds, chia, golden flax, brown flax, white perilla, and brown perilla, were determined. The chemical properties analyzed included moisture, ash, crude protein, carbohydrates, total lipids, fatty acids, and antioxidant capacity (ABTS•+, DPPH•, and FRAP). The results showed the highest amounts of protein and total lipids in brown and white perilla. Perilla and chia showed higher amounts of alpha-linolenic fatty acid than those of flaxseed varieties, ranging between 531.44 mg g-1 of lipids in brown perilla, 539.07 mg g-1 of lipids in white perilla, and 544.85 mg g-1 of lipis in chia seed. The antioxidant capacity of the seeds, evaluated with ABTS•+, DPPH• , and FRAP methods, showed that brown perilla...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant capacity; Chia; Omega-3; Salvia hispânica; Perilla frutescens; Linum usitatissimum.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612013000300024
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Antioxidant capacity and composition of pitanga seeds Ciência Rural
Bagetti,Milena; Facco,Elizete Maria Pesamosca; Rodrigues,Daniele Bobrowski; Vizzotto,Márcia; Emanuelli,Tatiana.
Food industry generates a significant amount of seed wastes from the juice production, frozen pulps and jams. Considering that the characterization of wastes is the first step to determine their potential use, the aim of the present study was to determine the composition and the antioxidant capacity of seeds from pitanga fruits with different flesh colors (purple, red and orange). Chemical composition results revealed that pitanga seeds are a good source of insoluble dietary fiber, with low protein and fat levels, and no relevant differences were found among pitanga seeds from different flesh colors. Pitanga seed extracts had powerful antioxidant capacity that was partially correlated to their high phenolic content and showed some variation according to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant capacity; DPPH; FRAP; Eugenia uniflora L..
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000800036
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Antioxidant capacity of extracts and isolated compounds from Stryphnodendron obovatum Benth BJPS
Zocoler,Analice Martins Daleffi; Sanches,Andréia Cristina Conegero; Albrecht,Ingrid; Mello,João Carlos Palazzo de.
The extract from stem bark of Stryphnodendron obovatum Benth. was chromatographed on a Sephadex® LH-20 column, and yielded nine compounds: gallic acid (GA), p-hydroxybenzoic acid (PHB), gallocatechin (GC), epigallocatechin (EPG), 4'-O-methylgallocatechin (MGC), epigallocatechin-(4β→8)-epigallocatechin (EPEP), epigallocatechin-(4β→8)-gallocatechin (EPGC), robinetinidol-(4α→8)-gallocatechin (ROGC) and robinetinidol-(4β→8)-epigallocatechin (ROEP). Evaluation of the antioxidant capacity in vitro by the methods of DPPH free radical (IC50; μg/mL) and reduction of the phosphomolybdenum complex (RAC) gave the following results, respectively: crude extract 4.52 and 0.8242; ethyl-acetate fraction 4.04 and 0.9537; aqueous fraction 5.58 and 0.9275. The crude extract...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stryphnodendron obovatum; Antioxidant capacity; Condensed tannins; DPPH free radical; Phosphomolybdenum complex.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502009000300009
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Antioxidant capacity of several Iranian, wild and cultivated strains of the button mushroom BJM
Tajalli,Faezeh; Malekzadeh,Khalil; Soltanian,Hadi; Janpoor,Javad; Rezaeian,Sharareh; Pourianfar,Hamid R..
The white button mushroom, Agaricus bisporus, is the most commonly grown mushroom in Iran; however, there is a significant shortage of research on its antioxidant activity and other medicinal properties. The aim of this study was to evaluate antioxidant capacity of the methanolic extracts from four cultivated strains and four Internal Transcribed Spacer (ITS)-identified, Iranian wild isolates of A. bisporus. Evaluations were made for total phenols, flavonoids and anthocyanins, and 2, 2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity. Overall, results showed that all the wild isolates exhibited significantly lower DPPH-derived EC50, compared to the cultivated strains (p < 0.05). A relatively high relationship was observed between total phenols and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agaricus bisporus; Antioxidant capacity; Wild mushrooms; Methanolic extract; Anthocyanins.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300769
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Antioxidant properties and color of Hibiscus sabdariffa extracts Ciencia e Investigación Agraria
Salazar-González,Claudia; Vergara-Balderas,Fidel T; Ortega-Regules,Ana E; Guerrero-Beltrán,José Á.
Liquid extracts of dried Roselle (Hibiscus sabdariffa) calyces obtained using ethanol:water (50:50 and 70:30%, v/v), water, ethanol:1.5 N HCl (85:25%, v/v), and ethanol (96%) to evaluate selected antioxidant characteristics (phenolic compounds and antioxidant capacity), color parameters (L, a, and b), and anthocyanins (delphinidin-3-O-sambubioside, delphinidin-3-O-glucoside (myrtillin), and cyanidin-3-O-sambubioside) by high performance liquid chromatography (HPLC). The total monomeric anthocyanin content was also assessed using the differential pH technique. The phenolic compound content ranged from 1,067±22 (in ethanol) to 2,649±96 (in ethanol:water 70:30%) mg of gallic acid100 g-1 of dehydrated calyces, and the antioxidant capacity ranged from 3.11±0.50...
Tipo: Journal article Palavras-chave: Anthocyanins; Antioxidant capacity; Cyanidin-3-O-sambubioside; Delphinidin-3-O-sambubioside; Delphinidin-3-O-glucoside; Myrtillin; Hibiscus sabdariffa; Roselle calyces.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100006
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Antioxidants in yacon products and effect of long term storage Ciênc. Tecnol. Aliment.
Castro,Alejandra; Caballero,Maciel; Herbas,Adelina; Carballo,Sergio.
Yacon (Smallanthus sonchifolius (Poepp. and Endl.) H. Robinson) is a storage root originally grown in the Andean highlands. The fresh roots are perishable and quickly turn brown during handling and processing. Aiming to prolong shelf-life and to preserve the antioxidant compounds in yacon roots, 3 mm thick yacon slices were dried in a drying cabinet at 40, 50, and 60 ºC to a moisture content of 10-14%, and yacon strips were sun dried to a moisture content of 15-20%. The total phenolic content was measured by the Folin-Ciocalteu method, and the quenching capacity was evaluated by measuring the amount of DPPH (1,1-diphenyl-2-pidrylhydrazyl) inhibited in samples after drying and after 7 months of storage. The results showed that it is possible to preserve the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Yacon; Phenolic content; Drying; Storage; Antioxidant capacity.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000300003
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Ascorbic acid, phenolic content, and antioxidant capacity of red, cherry, yellow and white types of pitaya cactus fruit (Stenocereus stellatus Riccobono) Agrociencia
Beltrán-Orozco,M. Carmen; Oliva-Coba,Tzatzil G.; Gallardo-Velázquez,Tzayhri; Osorio-Revilla,Guillermo.
In order to sustain the growing interest in the consumption of pitaya cactus (Stenocereus stellatus Riccobono) fruit as potential neutraceutical food, the total phenolics and ascorbic acid contents were determined in four pitaya cactus fruit types (red, cherry, yellow and white). Total phenol and ascorbic acid concentrations were correlated to the antioxidant capacity (fimol Trolox eq g-1 fresh sample). The results showed that the white and yellow types contained a higher amount of phenol compounds and ascorbic acid than the cherry and red types. A linear relationship was found between the fruit antioxidant capacity and the total phenol content (R²=0.97) and ascorbic acid content (R²=0.79), indicating that both of them contribute together to its...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stenocereus stellatus Riccobono; Antioxidant capacity; Ascorbic acid; Nutraceutic; Pitaya; Total phenolic content.
Ano: 2009 URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952009000200007
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Beefsteak fungus Fistulina hepatica: phenolic compounds and organic acids contents and antioxidative properties IPB - Escola Superior Agrária
Ribeiro, Bárbara; Valentão, P.; Baptista, Paula; Seabra, R.M.; Andrade, P.B..
Tipo: ConferenceObject Palavras-chave: Fistulina hepatica; Phenolic compounds; Antioxidant capacity; HPLC - DAD.
Ano: 2006 URL: http://hdl.handle.net/10198/5748
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Bioactive compounds and antioxidant capacities in the flavedo tissue of two citrus cultivars under low temperature Braz. J. Plant Physiol.
Mohammadian,Mansour Afshar; Mobrami,Zeinab; Sajedi,Reza Hasan.
Antioxidants production is amongst the physiological responses of plants to protect their tissues from oxidative damages caused by chilling and freezing stresses. Indeed, cold tolerance of plants is related to production of reactive oxygen species (ROS) scavengers to combat oxidative stress. In this study, two citrus cultivars including Citrus sinensis 'Siavaraz' and Citrus limon 'Lisbon' grown at the north of Iran were examined to compare antioxidants changes including total flavonoid, total phenol and total antioxidant capacities (TAC) in the flavedo tissue of the fruits under various low temperature treatments of control (15 ºC), 3, 0, -3 and -6 ºC. The results indicated that total flavonoid content and TAC in Citrus limon 'Lisbon' was significantly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant capacity; Citrus; Low temperature treatment.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000300004
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Bioactive compounds and quality characteristics of five apples cultivars Ciência Rural
Zucoloto,Moises; Ku,Kang-Mo; Kushad,Mosbah M.; Sawwan,Jamal.
The aim of this study was to evaluate bioactive compounds in five apple cultivars and to analyze correlation of their quality characteristics with concentration of bioactive compounds. Phenolic compounds measurements were made in a spectrophotometer compared to a standard curve of gallic acid and expressed as gallic acid equivalent (GAE) per 100g of dry weight. Sugar and organics acids in five cultivars were quantified using high-performance liquid chromatograph (HPLC). Antioxidant activities were evaluated using three complementary tests 2,2-diphenyl-1-picrylhidrazyl (DPPH) scavenging activity, ferric reducing antioxidant power (FRAP), and 2,2'-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS). 'GoldRush' had the highest total phenolic compared to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mallus domestica; Organic acids; Sugar; Antioxidant capacity; HPLC/DAD.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001101972
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Biochemical and bioactive phytonutrients changes in tissues of two cultivars of fresh-cut cassava in stick form under refrigerated storage Ciência Rural
Junqueira,Mateus da Silva; Simões,Adriano do Nascimento; Sediyama,Tocio; Côrrea,Paulo Cesar; Puschmann,Rolf.
The aim of this study was to evaluate the effects of fresh-cut in stick form of two cassava cultivars on their biochemical and antioxidant characteristics, at two harvest times. The fresh cut cassava sticks were packaged in polypropylene, maintained at 5±1ºC, with 90±5% relative humidity for 12 days. The concentration of carotenoids, total soluble phenolic compounds and the activity of phenylalanine ammonia lyase and antioxidant capacity were significantly higher for the sticks of cultivar 'Amarela' cassava than for the sticks of cultivar 'Cacau'. The concentrations of carotenoids, total soluble phenolic compounds, and the activity of phenylalanine ammonia lyase and antioxidant capacity were all significantly greater when harvested at 14-month of age....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Manihot esculenta Crantz; Carotenoids; PAL; Quality; Antioxidant capacity.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000701284
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Cambuci: a native fruit from the Brazilian Atlantic forest showed nutraceutical characteristics Rev. Bras. Frutic.
Tokairin,Tatiane de Oliveira; Silva,Aline Priscilla Gomes da; Spricigo,Poliana Cristina; Alencar,Severino Matias de; Jacomino,Angelo Pedro.
Abstract The Atlantic Forest is recognized as a biome rich in biodiversity. Cambuci trees (Campomanesia phaea) produce fruits that may be consumed as both fresh and processed forms but are still underutilized. The aim of this study was to describe the physicochemical characteristics and bioactive compounds in cambuci fruits from Brazilian Atlantic Forest, located at Natividade da Serra-SP, Brazil. Cambuci fruits of the fifty-nine accessions were characterized according to fresh weight, pulp yield, peel percentage, longitudinal and transversal diameters (LD and TD, respectively), pH, soluble solids content (SSC), titratable acidity (TA), SSC/TA ratio, ascorbic acid, total phenolic compounds content, and antioxidant activity using the DPPH assay. The...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Campomanesia phaea; Postharvest quality; Antioxidant capacity.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000500702
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Capacidade hidrolítica de alcalase versus novo pro D na hidrólise de CMS de tilápia. Repositório Alice
ANTUNES, A. B.; ATANASIO, N. M.; BRIGIDA, A. I. S.; GOMES, F. dos S.; SILVA, C. M.; STEPHAN, M. P..
A hidrólise enzimática parcial das proteínas de carne mecanicamente separada (CMS) de tilápia pode incrementar suas propriedades funcionais agregando valor e tornando esta uma boa alternativa para o aproveitamento destes resíduos agroindustriais. Assim, duas enzimas foram investigadas quanto ao seu potencial catalítico de hidrólise em CMS de tilápia, Alcalase® e Novo Pro-D®. Durante 5 horas de reação o grau de hidrólise foi acompanhado e, em tempos pré-definidos, frações do meio reacional foram coletadas. As amostras foram analisadas quanto sua atividade antioxidante, capacidade emulsificante, teor de aminoácidos aromáticos livres e perfil proteico. Embora Novo Pro D® tenha apresentado maior grau de hidrólise (55%) frente à Alcalase® (42%), esta última...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Coproduto; Hidrolisado proteico; Capacidade antioxidante; Protease; Co-product; Protein hydrolysate; Antioxidant capacity.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1057894
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Carotenoids are related to the colour and lipid content of the pequi (Caryocar brasiliense Camb.) pulp from the Brazilian Savanna Ciênc. Tecnol. Aliment.
Ribeiro,Débora Melo; Fernandes,Daniela Canuto; Alves,Aline Medeiros; Naves,Maria Margareth Veloso.
This study investigated the colour, proximate composition, bioactive compounds (phenolic and carotenoid contents), and antioxidant activity of the pulp of pequi from different regions of the Brazilian Savanna. The colour parameters and the lipid and carotenoid contents of the pulp were significantly different between the samples. The lipid content ranged from 135.4 to 322.5 g/kg. The pequi pulp showed high total phenolic content (1.8 to 3.3 mg GAE/g). The carotenoid amount ranged from 37 to 187 µg/g. The carotenoid content was significantly correlated with the colour and lipid content of the pequi pulp. The antioxidant activity showed a mean IC50 value of 197.9 µg/mL. The pequi pulp is rich in phenolic compounds and carotenoids and has a good antioxidant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Caryocar brasiliense Camb.; Native fruits; Savanna; Bioactive compounds; Antioxidant capacity.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612014000300011
Registros recuperados: 77
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