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| Registros recuperados: 11 | |
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| Urías-Orona,Vania; Niño-Medina,Guillermo. |
| ABSTRACT The objective of this research was to evaluate the changes of phenolics and antioxidant capacity of a ready-to-drinkgreen tea beverage during short storage at commercial conditions. The total phenols (Folin-Ciocalteu), total catechins (4-dimethylaminocinnamaldehyde) and total non-catechins (difference between total phenols and total catechins) were evaluated as part of phenolic analysis, while antioxidant capacity was evaluated by using DPPH (2,2-diphenyl-1-picrylhydrazyl) radical. At the beginning of the experiment, the levels of total phenols, total catechins and total non-catechins were 1220.69 ± 29.73, 636.94 ± 14.60and 584.75 ± 15.12 milligrams of catechin per liter of sample, respectively; these values decreased to 674.38 ± 26.52, 424.54 ±... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Camellia sinensis; Total phenolics; Total catechins; Total non-catechins; DPPH antioxidant capacity; Short storage. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000100141 |
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| Al-Reza,Sharif M.; Rokonuzzaman,M.; Afroz,Monira; Hussain,Md. Iqbal; Rashid,M. A.; Rahman,Atiqur. |
| ABSTRACT This study was designed to examine the chemical composition and in vitro antioxidant activity of the hydrodistillated essential oil and various extracts obtained from Premna integrifolia Linn. GC-MS analysis of the essential oil was resulted in determination 29 different compounds, representing 95.73% of total oil. Antioxidant activities of the essential oil and organic extracts of chloroform, ethyl acetate and methanol were determined by three different test systems namely DPPH (2,2-diphenyl-1-picrylhydrazyl), superoxide and nitric oxide radical scavenging assays. The essential oil and methanol extract showed potent antioxidant activity among all the tested samples. Furthermore, the amount of total phenolic compounds was determined and its... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Premna integrifolia Linn; Antioxidant activity; Essential oil; Total phenolics. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100203 |
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| Pereira,Juciane Abreu Ribeiro; Teixeira,Meryene Carvalho; Saczk,Adelir Aparecida; Barcelos,Maria de Fátima Piccolo; Oliveira,Marcelo Firmino de; Abreu,Wilson César de. |
| ABSTRACT Yacon (Smallanthus sonchifolius) is a tuberous root from the Andean region in the South America rich em water, fructooligosaccharides and phenolic compounds, some of which are natural antioxidants and may help prevent the deleterious action of free radicals in the body. The yacon has attracted much attention due to their potential health benefits to humans. In this study the levels of total phenolics, tannins, phenolic acids, and total antioxidant activity were measured in the peel and pulp of yacon tubers both in the fresh and flour forms. The flours of yacon presented higher concentrations of total phenolics and tannins, especially peel flour. The yacon pulp flour stood out as the main source of phenolic acids, mainly caffeic and chlorogenic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Smallanthus sonchifolius; Total phenolics; Tannins; Phenolic acids. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000500596 |
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| Vasconcelos,Maria Raphaella dos Santos; Duarte,Alysson Wagner Fernandes; Gomes,Elane Pereira; Silva,Silvio Chagas da; López,Ana Maria Queijeiro. |
| ABSTRACT Bee pollen results from the mixture of pollen and floral nectar with the salivary substances of bees and has increasingly been used as a food with therapeutic properties. In this study, 30 samples of bee pollen from Apis mellifera apiaries in three mesoregions of Alagoas (Brazil) - Mata Atlântica, South Coast and Caatinga, were collected during the dry season of 2008/09 and analysed. Mata Atlântica and Caatinga had good production of bee pollen. In the same season, Mata Atlântica contained a higher diversity of pollen types for feeding bees with a predominance of herbaceous pollen (63%), whereas the Caatinga samples contained monofloral pollen. Physicochemical data were analysed with the nonparametric Kruskal-Wallis statistical test. The Caatinga... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apis mellifera; Total phenolics; Floral origin.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000400447 |
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| Malacrida,Cassia Roberta; Kimura,Mieko; Jorge,Neuza. |
| The physicochemical characteristics, fatty acid, tocopherol, and carotenoid composition of a crude oil extracted from papaya (Carica papaya L.) seeds, formosa variety, were investigated. The oil yield from the seeds was 29.16%. The data obtained for the analytical indexes were in agreement with those of other edible oils. The oil obtained had high oxidation resistance (77.97 hours). The major fatty acids in total lipid were oleic (71.30%), palmitic (16.16%), linoleic (6.06%), and stearic (4.73%) acid. The α and δ-tocopherol were the predominant tocopherols with 51.85 and 18.89 mg.kg-1, respectivelly. The β-cryptoxanthin (4.29 mg.kg-1) and β-carotene (2.76 mg.kg-1) were the carotenoids quantified, and the content of total phenolic compounds was 957.60... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Seed oil; Fatty acid; Tocopherol; Carotenoid; Total phenolics. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612011000400016 |
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| SOARES,Jackeline Cintra; SOARES JÚNIOR,Manoel Soares; FERREIRA,Karen Carvalho; CALIARI,Márcio. |
| Abstract The market for ready-to-drink fruit nectars is one of the fastest growing ones, because fruits provide beneficial effects for health maintenance and disease prevention, mainly due to the presence of phenolic compounds and their antioxidant activity. Amongst these, jambolan stands out, but is still little explored. The objective of the present work was to evaluate the influence of different proportions of jambolan pulp, sucrose and water on the physicochemical characteristics and sensory acceptance of jambolan nectars, besides determining the content of some bioactive compounds and the antioxidant capacity of the selected nectar, with a view to adding value to the fruit. Six jambolan nectar formulations were established using a Simplex design. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Color; Total phenolics; Anthocyanin; Tannins; Functional beverage. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000500008 |
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| Kodama,Débora Harumi; Gonçalves,Any Elisa de Souza Schmidt; Lajolo,Franco Maria; Genovese,Maria Inés. |
| The potential health benefits attributed to green tea and its catechins such as antioxidant effects, cancer chemoprevention, and weight loss have led to a huge increase of green tea products in the food market. The objectives of this work were to analyze and compare these products in terms of phenolic contents and in vitro antioxidant capacity including tea bags, dehydrated leaves, and ready-to-drink preparations after standardization of the infusion preparation procedure. Total phenolics content in 1 cup of the different teas varied from 90 to 341 mg of catechin equivalents, and the highest and the lowest values were both those of the ready-to-drink products. Infusions prepared from tea bags had contents varying from 96 to 201 mg.200 mL-1, and there were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidant capacity; Catechins; Total phenolics; Green tea. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612010000400037 |
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| Scala,Karina Di; Vega-Gálvez,Antonio; Ah-Hen,Kong; Nuñez-Mancilla,Yissleen; Tabilo-Munizaga,Gipsy; Pérez-Won,Mario; Giovagnoli,Claudia. |
| The aim of this study was to evaluate the influence of high hydrostatic pressure (150, 250, 350, 450, and 550 MPa), applied for 5 minutes, on antioxidant capacity, total phenolic content, color, firmness, rehydration ratio, and water holding capacity of aloe vera gel stored for 60 days at 4 °C. The analyzed properties of the pressurized gel showed significant changes after the storage period. The highest value of total phenolic content was found at 550 MPa. However, a decrease in the antioxidant capacity was observed for all pressurized gel samples when compared to the control sample (p < 0.05). The smallest changes in product color were observed at pressure levels between 150 and 250 MP. The application of high hydrostatic pressure resulted in lower... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidant capacity; Total phenolics; Quality; Aloe vera. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612013000100009 |
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| Braga,Gilberto Costa; Melo,Priscilla Siqueira; Bergamaschi,Keityane Boone; Tiveron,Ana Paula; Massarioli,Adna Prado; Alencar,Severino Matias de. |
| ABSTRACT: The objective of this study was to determine and correlate the extraction yields, antioxidant activity, total phenolics and total flavonoids from grape, mango and peanut agro-industrial by-products. The β-carotene/linoleic acid autoxidation system and scavenging capacity for DPPH and ABTS free radicals assays were used. The results were expressed in terms of lyophilized sample or dry extract. Mango bagasse exhibited the highest extraction yield (37.07%) followed by peanut skin (15.17%) and grape marc (7.92%). In terms of lyophilized sample, total phenolics did not vary significantly among the residues evaluated (average of 60.33mg EAG g-1); however, when they were expressed as dry extract grape marc exhibited the highest total phenolic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Total phenolics; Total flavonoids; Ethanolic extraction. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000801498 |
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| Registros recuperados: 11 | |
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