Consulta: subjectFacets:"ABTS"
Registros recuperados: 11
Data/hora: 10/06/2024 02:47:57

Fenólicos totais e capacidade antioxidante in vitro de polpas de frutos tropicais
Provedor de dados: 94
Autores: Vieira,Luanne Morais; Sousa,Mariana Séfora Bezerra; Mancini-Filho,Jorge; Lima,Alessandro de.
O consumo de frutos e suas polpas tem sido muito recomendado por seu valor nutricional, alto teor de fibras, vitamina C e carotenoides. Trabalhos recentes têm apontado esses alimentos como fontes de compostos fenólicos com ação antioxidante, portanto sequestradores de radicais livres, com ação protetora contra o surgimento e/ou desenvolvimento de processos degenerativos que conduzem a doenças crônicas não transmissíveis. Devido à crescente comercialização e consumo de polpas de frutas no Brasil, especialmente na cidade de Teresina-Piauí, este trabalho selecionou um grupo de polpas de frutos de elevado consumo local para avaliação do teor de fenólicos totais e da atividade antioxidante in vitro pelo método de captura de radicais livres: DPPH (radical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atividade antioxidante; ABTS; DPPH e frutos.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000300024

Valoración del potencial antioxidante de Mollinedia racemosa (romadizo)
Provedor de dados: 98
Autores: Solanilla Duque,José Fernando; Lombo,Oscar; Murillo Perea,Elizabeth; Méndez Arteaga,Jonh Jairo.
Introducción: Mollinedia racemosa (Schltdl.) Tul. (romadizo), es una especie usada por grupos indígenas y comunidades campesinas de la cuenca del Orinoco colombiano, empleada para tratar fiebres, dolores de cabeza y problemas de estómago, especialmente en el tratamiento del resfriado y como analgésico. Objetivo: evaluar el potencial antioxidante de las hojas de M. racemosa (romadizo). Métodos: se preparó un macerado etanólico de hojas (relación 1:15, vegetal/solvente), renovando el solvente cada 24 h hasta agotar la muestra. El extracto se filtró, se concentró a presión reducida y se almacenó (4 ºC). Se valoró el contenido de compuestos fenólicos, flavonoides y de flavonoles totales. Se estableció además la concentración de alcaloides que posee la planta....
Tipo: Journal article
Palavras-chave: Mollinedia racemosa; Actividad antioxidante; DPPH; ABTS; Peroxidación lipídica; Compuestos fenólicos.
Ano: 2011
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1028-47962011000200004

Antioxidants properties of chocolates sold in Peru
Provedor de dados: 109
Autores: Calixto-Cotos,María Rosario; Chire-Fajardo,Gabriela Cristina; Orihuela-Rivera,Carmen Adela.
Abstract The goals of this paper were to evaluate total polyphenol content (TPC), total flavonoid content (TFC), anti-oxidant capacity (AC) and reducing power (RP) of eight dark chocolates that are sold in Peru. Imported and domestic chocolate samples containing between 50% and 74% cacao were defatted. Defatted chocolate (DCh) was separated and treated to extract phenolic compounds. The TPC and AC were determined by using the Folin-Ciocalteu reagent and two in vitro models based on the free-radical capturing capacity DPPH and ABTS. The RP was evaluated by using the potassium pherricyanide method; in the TFCs assessments, catechin was used as the standard. Chocolate TPC varied between 1.69 ± 0.02 and 5.39 ± 0.17 mg gallic acid/g chocolate and AC (DPPH-IC50)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ABTS; Cacao; Defatted chocolate; DPPH; Folin-Ciocalteu; Flavonoid; Polyphenolic compounds; Reducing power.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000400479

Antioxidant and anticholinesterase investigations of Rumex hastatus D. Don: potential effectiveness in oxidative stress and neurological disorders
Provedor de dados: 48
Autores: Ahmad,Sajjad; Ullah,Farhat; Ayaz,Muhammad; Sadiq,Abdul; Imran,Muhammad.
BACKGROUND: Rumex species are traditionally used for the treatment of neurological disorders including headache, migraine, depression, paralysis etc. Several species have been scientifically validated for antioxidant and anticholinestrase potentials. This study aims to investigate Rumex hastatus D. Don crude methanolic extract, subsequent fractions, saponins and flavonoids for acetylcholinestrase, butyrylcholinestrase inhibition and diverse antioxidant activities to validate its folkloric uses in neurological disorders. Rumexhastatus crude methanolic extract (Rh. Cr), subsequent fractions; n-hexane (Rh. Hex), chloroform (Rh. Chf), ethyl acetate (Rh. EtAc), aqueous fraction (Rh. Aq), crude saponins (Rh. Sp) and flavonoids (Rh. Fl) were investigated against...
Tipo: Journal article
Palavras-chave: Ethnomedicinal; Acetylcholinesterase; Butyrycholinesterase; DPPH; ABTS.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100020

Oxidative stress is closely related to clinical severity of pre-eclampsia
Provedor de dados: 48
Autores: CHAMY,VERÓNICA M; LEPE,JAIME; CATALÁN,ÁLVARO; RETAMAL,DAVID; ESCOBAR,JORGE A; MADRID,EVA M.
Pre-eclampsia is a hypertensive disorder of pregnancy in which enzymatic antioxidant defenses fail and tissues are injured. This prospective case-control study evaluated whether pre-eclamptic women and their newborns show higher degrees of oxidative stress than normal pregnancies and sought to determine if this stress is related to clinical severity. Forty-four pre-eclamptic and thirty healthy pregnant women attending two hospitals in Valparaíso, Chile, were studied. The following plasmatic variables of antioxidant capacity were evaluated: glutathione peroxidase activity (GPx), total antioxidant capacity measured by oxidation of ABTS substrate (2,2'-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid), and superoxide dismutase activity (SOD). malondialdehide...
Tipo: Journal article
Palavras-chave: Pre-eclampsia; MDA; SOD; GPx; ABTS; Lipoperoxidation; Antioxidants.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200005

Free radical scavenging activity of ethanolic extracts from herbs and spices commercialized in Brazil
Provedor de dados: 52
Autores: Mariutti,Lilian Regina Barros; Barreto,Gisela Pizarro de Mattos; Bragagnolo,Neura; Mercadante,Adriana Zerlotti.
Ethanolic extracts from 23 different dried herbs and spices commercialized in Brazil were investigated for their free radical scavenging properties using the stable free radicals 2,2'-diphenyl-β-picrylhydrazyl (DPPH•) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS•+), and Trolox as reference (TEAC) for both radicals. The kinetic curves for both radicals showed to follow the first order kinetics model and the decay rate constant (k obs) was calculated. For all the samples, the two methods showed a good linear TEAC correlation, indicating that the average reactivity of the compounds present in the ethanolic extracts was similar. Sage and rosemary extracts showed the highest free radical scavenging capacities, while onion showed negligible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant activity; Free radical scavenging activity; DPPH; ABTS; Herbs; Spices; Colorifico.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000600018

Antioxidant Activities of Chicken Egg White Hydrolysates Obtained by New Purified Protease of Aspergillus avenaceus URM 6706
Provedor de dados: 52
Autores: Silva,Anna Carolina da; Queiroz,Alana Emilia Soares de França; Oliveira,João Tiago Correia; Medeiros,Erika Valente; Souza-Motta,Cristina Maria de; Moreira,Keila Aparecida.
Abstract Protein hydrolysates originating from egg white have already been reported to be bioactive and, among their biological activities, possess the antioxidant property that protects the body from early ageing and diseases linked to oxidation. Therefore, the objective of this work was to evaluate the antioxidant activity of hydrolysates obtained by the hydrolysis of egg white from hen poultry. The protease produced by Aspergillus avenaceus URM 6706 was purified and subsequently applied to hydrolysate the egg white, and the degree of hydrolysis was verified during the protease exposure time (4-24 h). The hydrolysis was intensified over time of exposure to the protease. It was possible to detect the antioxidant activities of eliminating the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aspergillus; Purification; ABTS; +; DPPH; Chelators.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100508

Starch Films Added of Açaí Pulp ( Euterpe oleracea Martius)
Provedor de dados: 52
Autores: Pessanha,Kênia Letícia Ferreira; Farias,Mônica Guimarães; Carvalho,Carlos Wanderlei Piler; Godoy,Ronoel Luiz de Oliveira.
ABSTRACT Edible films are an alternative to synthetic materials used for packaging foods. The aim of this study was to develop and characterize films made from cassava starch, freeze-dried acai and glycerol. The films were characterized for thickness, water vapor permeability, water solubility, anthocyanins, antioxidant capacity and mechanical properties. The results indicated a rich edible film in anthocyanins with considerable antioxidant capacity (150.70 micromol Trolox), which can extend the commercial validity of the packaged food and meets the growing demand for biodegradable packaging that tends to reduce the environmental impact. The addition results in a significant effect on the polymer matrix reducing the water solubility and water activity. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Active packaging; Biodegradable; Anthocyanins; ABTS; ORAC.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100504

Atividade antioxidante e correlações com componentes bioativos de produtos comerciais de cupuaçu
Provedor de dados: 65
Autores: Santos,Gerusa Matias; Maia,Geraldo Arraes; Sousa,Paulo Henrique Machado; Figueiredo,Raimundo Wilane; Costa,José Maria Correia; Fonseca,Ana Valquíria Vasconcelos.
O cupuaçu é considerado um importante fruto tipicamente amazônico e apresenta polpa ácida, agradável e de aroma característico. Esses atributos de qualidade o colocam no ranking das exportações de frutas. No Brasil, o cupuaçu é consumido principalmente na forma de polpa congelada. Os estudos com marcas comerciais de polpa de cupuaçu que correlacionaram a atividade antioxidante aos níveis de compostos bioativos mostraram que a capacidade de sequestro de espécies radicalares, pelo método do radical ABTS, apresentou correlação positiva com os compostos fenólicos e não com os carotenoides e a vitamina C. Porém, todas as marcas avaliadas apresentaram diferenças significativas quanto aos teores de vitamina C, carotenoides e capacidade antioxidante total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Theobroma grandiflorum; Compostos fenólicos; Carotenóides; Vitamina C; Atividade antioxidante; ABTS.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000700024

Maceration extraction conditions for determining the phenolic compounds and the antioxidant activity of Catharanthus roseus (L.) G. Don
Provedor de dados: 64
Autores: Cacique,Ane Patrícia; Barbosa,Érica Soares; Pinho,Gevany Paulino de; Silvério,Flaviano Oliveira.
ABSTRACT Catharanthus roseus(L.) G. Don is a medicinal plant known for its important constituent aromatic compounds. In the literature, no detailed studies elucidating the methods of extraction of phenolic compounds for this species are available. Therefore, the present study was aimed at evaluating the maceration parameters for determining the total phenols content in C. roseus. The parameters of plant mass, extraction phase composition, homogenization type, extraction time, and temperature were evaluated in terms of improving the extraction conditions. The plant extracts were subjected to specific spectrophotometric analysis designed for each parameter, and the total phenols content was determined. After establishing the optimal conditions, the extracts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytochemistry; DPPH; ABTS; FRAP; Phenolic acids.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100245

Bioactive compounds and total antioxidant capacity of cashew apples (Anacardium occidentale L.) during the ripening of early dwarf cashew clones
Provedor de dados: 64
Autores: Lopes,Mônica Maria de Almeida; Miranda,Maria Raquel Alcântara de; Moura,Carlos Farley Herbster; Enéas Filho,Joaquim.
Lately, tropical fruit consumption has increased due to a higher knowledge of its nutritional and therapeutic value. The aim of this work was to evaluate the antioxidant potential of cashew apples from different early dwarf clones during their ripening. The clones analyzed included: CCP 76, CCP 09, BRS 189 and BRS 265 in seven ripening stages. They were analyzed for vitamin C, total carotenoid, total anthocyanin, yellow flavonoids and polyphenol content and total antioxidant capacity. Clone BRS 265 ripe cashew apple presented the highest vitamin C content (279.37 mg x 100 g-1). The ripe BRS 189 cashew apple is colored bright red, and its total anthocyanin content was the highest (21.16 mg x 100 g-1). The yellow flavonoids content was higher for ripe CCP 76...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyphenols; ABTS; Vitamin C; Carotenoids; Food analysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000300008