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| Registros recuperados: 25 | |
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| AKBAR,M.; SHERAZI,I.N.; IQBAL,M.S.; KHALIL,T.; WAQAS,H.M.. |
| ABSTRACT: In the present study, antibacterial and antioxidant [1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity] activities of a weed, slender amaranth (Amaranthus viridis L.) were investigated. Extracts of different plant parts were prepared in n-hexane, chloroform and ethyl acetate. Antibacterial activity was measured by using 100 mg mL-1 concentration extracts against 4 deadly phytopathogenic bacterial species viz. Pseudomonas syringae Van Hall, Ralstonia solanacearum Smith, Erwinia carotovora (Jones), Holland and Xanthomonas axonopodis Hasse. In antioxidants assays, 10, 20 and 30 mg mL-1 extracts were used keeping DPPH as control. In these bioassays, ethyl acetate fraction of A. viridis leaf exhibited the best antibacterial and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amaranthus viridis; Bioactive components; DPPH; Phytopathogens; Weeds. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100206 |
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| Neves,Leandro Camargo; Campos,André José de; Benedette,Ronaldo Moreno; Tosin,Jéssica Milanez; Chagas,Edvan Alves. |
| The objective of the present study was to characterize the chemistry and the antioxidant capacity in 8 species of native fruits from Amazonia. All the fruits were collected at full physiological and commercial maturity from properties located at: Boa Vista / RR, São Luiz do Anauá / RR, Manaus / AM, and Belém / PA. At the end of the experiment, the functional pattern for the camu-camu fruits showed that the total phenolic and ascorbic acid content and antioxidant assays were superior compared to the other samples. Despite the functional losses detected for the freeze-dried samples of the camu-camu fruit, all the other freeze-dried samples kept under -20ºC showed appropriate stability for long-term storage. In addition, it was also observed that fruit peel... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: ORAC; DPPH; Funcional compounds; Nutritional. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452012000400025 |
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| 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 |
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| NEUZA,JORGE; BRUNA,JORGE BERTANHA; MORENO LUZIA,DÉBORA MARIA. |
| Múltiples compuestos naturales encontrados en frutas, cereales y vegetales presentan actividad antioxidante. Este trabajo tuvo como objetivo caracterizar las semillas de jabuticaba (Myrciaria cauliflora Berg) en cuanto a su composición proximal y potencial antioxidante, y evaluar el perfil de ácidos grasos en el aceite extraído de las mismas. Para la obtención del extracto, las semillas deshidratadas y trituradas fueron extraídas con alcohol etílico por 30 minutos, en la proporción de 1:3 de semillas:alcohol etílico, bajo agitación continua, a temperatura ambiente. Seguidamente, la mezcla fue filtrada y el sobrenadante deshidratado a 40 ºC con la finalidad de determinar, por pesaje directo, rendimiento en materia seca del extracto. De acuerdo con los... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Semillas; Aceites comestibles; Actividad antioxidante; Compuestos fenólicos; DPPH; Frutas. |
| Ano: 2011 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2011000200006 |
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| Jaramillo-Colorado, Beatriz Eugenia; Martínez-Cáceres, Eduardo Luis; Duarte-Restrepo, Edisson. |
| The essential oil from the fresh leaves of Kyllinga pumila (Michx) was obtained by hydrodistillation and characterized by gas chromatography-mass spectrometry (GC-MS). Twenty-eight volatile compounds were identified, major constituents of the oil were Methyl E,E-10,11-epoxyfarnesoate (43.8%), β-elemene (12.5%), Z-caryophyllene (11.3%), germacrene D (7.1%) and E-caryophyllene (5.6%). Repellent and fumigant activities of the oil against Tribolium castaneum Herbst (Coleoptera: Tenebrionidae), were done using the area preference method. Additionally, we studied their antioxidant and phytotoxic effects. Essential oils exhibited a dose-dependent repellent activity, with values 90% at the applied concentration (0.01%), for both two and four hour’s exposure.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Essential oils; Repellent activity; Fumigant; Tribolium castaneum; Phytotoxic; DPPH. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/32386 |
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| Silva,Maria Carolina A. da; Paiva,Selma R.. |
| Clusia fluminensis Planch. & Triana (Clusiaceae Lindl.) is a native species found in regions of high luminosity and water restriction. The aim of this study was to evaluate the antioxidant activity of Clusia fluminensis crude extracts through the scavenging of the stable free radical DPPH, and the determination of flavones and flavonols content in these extracts. The fruit acetonic extract showed the lowest EC50 value (2.71 ± 0.34 g extract / g DPPH), the lowest percentage of remaining DPPH at the concentrations of 125 and 250 µg/mL (about 4% in both), and also the greatest percentage of flavones and flavonols (13.93 ± 0.21 %). Statistical analysis suggests a positive correlation between the presence of flavonoids and the antioxidant activity of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aluminum chloride; Clusia fluminensis; DPPH; Flavonoids. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300004 |
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| Paudel,Babita; Bhattarai,Hari Datta; Chan Kim,Il; Lee,Hyoungseok; Sofronov,Roman; Ivanova,Lena; Poryadina,Lena; Yim,Joung Han. |
| BACKGROUND: Several plants are reported to be produced various biological active compounds. Lichens from the extreme environments such as high altitude, high UV, drought and cold are believed to be synthesized unique types of secondary metabolites than the other one. Several human pathogenic bacteria and fungi have been muted into drug resistant strains. Various synthetic antioxidant compounds have posed carcinogenic effects. This phenomenon needs further research for new effective drugs of natural origin. This manuscript aimed to screen new source of biological active compounds from plants of subarctic origin. RESULTS: A total of 114 plant species, including 80 species of higher plants, 19 species of lichens and 15 species of mosses, were collected from... |
| Tipo: Journal article |
Palavras-chave: Antimicrobial; Antioxidant; Brine shrimp; DPPH; Lichen; Moss. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100010 |
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| 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 |
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| 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 |
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| 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 |
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| Shirinzadeh,Hanif; Ghalia,Mohammed; Tascioglu,Alev; Adjali,Ferial Intissar; Gunesacar,Gulsen; Gurer-Orhan,Hande; Suzen,Sibel. |
| Melatonin (MLT) is a strong free radical scavenger that protects the body from the deleterious effects of excess oxidants. Synthesis of MLT analogue compounds with antioxidant potency has recently attracted the interest of researchers. In general, the strategy consists of modifying the groups in the different sites of the indole ring or replacing the indole ring with an analogue. As part of our ongoing research, the antioxidant capacity and cytotoxicity of newly synthesized MLT analogue naphthalene derivatives were evaluated. The radical scavenging activity was tested by a 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. Most of the synthesized compounds showed significant antioxidant activity in comparison to MLT. The structure-activity relationship was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidant; Cytotoxic; Melatonin; MTT; DPPH. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100550 |
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| Meriño-Gergichevich,Cristian; Pacheco,Eduardo; Reyes-Díaz,Marjorie. |
| C. Meriño-Gergichevich, E. Pacheco, and M. Reyes-Díaz. 2016. The effect of foliar boron spraying on the fruit features of Brigitta and Legacy highbush blueberry (Vaccinium corymbosum) cultivars. Cien. Inv. Agr. 43(3):452-463. Boron (B) is associated with reproductive and antioxidant metabolism in plants, and in southern Chile, the deficiency of this micronutrient is ameliorated through foliar applications that are a part of agricultural management, thus ensuring the productivity of crops including highbush blueberry (Vaccinium corymbosum L.). However, the appropriate B dosage for this species is unknown, so the aim of this study was to evaluate foliar B application on fruit quality in highbush blueberry in southern Chile. During the 2014-2015 season,... |
| Tipo: Journal article |
Palavras-chave: Antioxidant; DPPH; Fruit quality; Micronutrient; ORAC. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300011 |
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| Fredes,Carolina; Montenegro,Gloria; Zoffoli,Juan Pablo; Santander,Francisca; Robert,Paz. |
| In the last 10 years, interest in research on polyphenol-rich fruit species has increased due to the potential health benefits of these species, mainly attributed to their high anthocyanin content and antioxidant activity. Six polyphenol-rich fruit species (blueberries, raspberries, blackberries, strawberries, pomegranates and maqui berries) were harvested at the same maturity stage during the same growing season and were compared according to their total phenolic (Folin-Ciocalteu method) and total anthocyanin (pH differential method) contents and antioxidant activity using ferric-reducing antioxidant power (FRAP assay) and 2,2-diphenylpicrylhydrazyl (DPPH) radical scavenging capacity methods. With the results of this study, the polyphenolic status of the... |
| Tipo: Journal article |
Palavras-chave: Berries; DPPH; FRAP; Maqui; Pomegranate. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100005 |
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| Registros recuperados: 25 | |
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