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Algicidal effects of Zostera marina L. and Zostera noltii Hornem. extracts on the neuro-toxic bloom-forming dinoflagellate Alexandrium catenella ArchiMer
Laabir, Mohamed; Grignon-dubois, Micheline; Masseret, Estelle; Rezzonico, Bernadette; Soteras, Giselle; Rouquette, Manuel; Rieuvilleneuve, Fabien; Cecchi, Philippe.
The inhibitory effects of crude extracts of Zostera marina L and Zostera noltii Hornemann on the growth of the toxic red tide dinoflagellate Alexandrium catenella were investigated through bio-assays. Methanolic and aqueous extracts were prepared from fresh and detrital leaves of Z. marina and Z. noltii collected in the Thau lagoon and Arcachon bay (France). All the extracts exhibited significant inhibition of A. catenella growth, whatever the species and without the need of continuous addition of extracts. The effective concentrations (EC50) varied in the range 0.036-0.199 g L-1 for Z. noltii and 0.036-0.239 g L-1 for Z. marina. Methanolic extracts prepared from fresh plant tissues were the most potent, with EC50 of 0.036-0.039 and 0.036-0.045 g L-1, for...
Tipo: Text Palavras-chave: Growth inhibition; Allelopathy; Alexandrium catenella; Zostera marina; Zostera noltii; Phenolics.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00170/28095/26720.pdf
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Allelopathic effects of aqueous and organic fractions of Euphorbia dracunculoides Lam. on germination and seedling growth of chickpea and wheat Chilean J. Agric. Res.
Tanveer,Asif; Kamran Jabbar,Muhammad; Kahliq,Abdul; Matloob,Amar; Nadeem Abbas,Rana; Mansoor Javaid,Muhammad.
Identification of weed species with allelopathic potential and characterization of their adverse effects against associated crops is required for better understanding of weed-crop interactions. Phytotoxic activity of Euphorbia dracunculoides Lam. on germination and seedling growth of chickpea (Cicer arietinum L.) and wheat (Triticum aestivum L.) was investigated under controlled conditions. Two separate studies were done with each of four organic solvent fractions (n-hexane, chloroform, ethylacetate, 1-butanol) and crude aqueous (1:10 and 1:20) whole plant fractions of E. dracunculoides using distilled water and 0.05% (v/v) dimethyl sulfoxide (DMSO) as control. Different aqueous and organic fractions of E. dracunculoides had a significant bearing on...
Tipo: Journal article Palavras-chave: Allelopathy; Weeds; Germination attributes; Suppression; Phenolics.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400006
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Antioxidant activity and physicochemical analysis of passion fruit (Passiflora glandulosa Cav.) pulp native to Cariri region Biological Sciences
Lima-Neto, Abelardo Barbosa Moreira; Marques, Márcia Maria Mendes; Mendes, Francisca Noélia Pereira; Vieira, Ícaro Gusmão Pinto; Diniz, Derlange Belizário; Guedes, Maria Izabel Florindo.
The objective of this study was to determine the proximal composition, the physical and chemical characteristics and the in vitro antioxidant capacity (DPPH, ABTS and FRAP) of the pulp of the wild passion fruit (Passiflora glandulosa Cav.) from Cariri region, Ceara, Brazil. The results showed that the proximal composition and the caloric value of this passion fruit are similar to other species, but with a high ascorbic acid content. The fruit pulp showed low level of antioxidant activity and low level of polyphenolic compounds followed by three methodologies used. Due to high levels of titratable acidity (3.52) and total soluble solids (17.80° Brix), this fruit can be considered as a high value fruit for commerce. However, it is a species of passion fruit...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.03.00.00-0; 5.07.00.00-6 functional food; Agricultural; Dietary fiber; Phenolics; Natural antioxidants. Botânica.
Ano: 2017 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/34045
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Antioxidant activity of 50% aqueous - ethanol extract from Acantholippia deserticola Biol. Res.
MORALES,GLAUCO; PAREDES,ADRIÁN; SIERRA,PATRICIA; LOYOLA,LUIS A.
The antioxidant properties oí Acantholippia deserticola, a herb used in traditional northern Chilean medicine was studied using free radical - generating systems. The 50% aqueous - ethanol extract oí Acantholippia deserticola protected against non-enzymatic lipid peroxidation in microsomal membranes of rat, induced by an Fe++ - ascorbate system and measured spectrophotometrically by the TBARS test, and had strong free radical scavenging capacities on stable ABTS and DPPH radicáis. The results shows that the IC50 valué of the 50% aqueous - ethanolic extract oí A.deserticola is 18 ± 0.5 μg/mL in DPPH radical - scavenging, 15 ± 0.8 μg/mL in lipid peroxidation , Total Antioxidant Activity (TAA) is 0.95 mM of Trolox per mg/mL of extract. The...
Tipo: Journal article Palavras-chave: Acantholippia deserticola; Northern Chilean medicinal plant; Phenolics; Free radicáis scavenging; Microsomal lipid peroxidation.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000200004
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Antioxidant activity of extract from Polygonum aviculare L. Biol. Res.
HSU,CHIN-YUAN.
Free radicals induce numerous diseases by lipid peroxidation, protein peroxidation, and DNA damage. It has been reported that numerous plant extracts have antioxidant activities to scavenge free radicals. Whether Polygonum aviculare L. (Polygonaceae) has antioxidant activity is unknown. In this study, dried Polygonum aviculare L. was extracted by ethanol, and the extract was lyophilized. The antioxidant activities of extract powder were examined by free radical scavenging assays, superoxide radical scavenging assays, lipid peroxidation assays and hydroxyl radical-induced DNA strand scission assays. The results show that the IC50 value of Polygonum aviculare L. extract is 50 µg/ml in free radical scavenging assays, 0.8 µg/ml in superoxide radical scavenging...
Tipo: Journal article Palavras-chave: Antioxidant activity; Free radical; Phenolics; Lipid peroxidation; DNA damage Polygonum aviculare L.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200010
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Antioxidant activity of extract from Polygonum cuspidatum Biol. Res.
HSU,CHIN-YUAN; CHAN,YU-PEI; CHANG,JELI.
Numerous diseases are induced by free radicals via lipid peroxidation, protein peroxidation and DNA damage. It has been known that a variety of plant extracts have antioxidant activities to scavenge free radicals. Whether Polygonum cuspidatum Sieb. et Zuce has antioxidant activity is unknown. In this study, dried roots of Polygonum cuspidatum were extracted by ethanol and the extract was lyophilized. Free radical scavenging assays, superoxide radical scavenging assays, lipid peroxidation assays and hydroxyl radical-induced DNA strand scission assays were employed to study antioxidant activities. The results indicate that the IC50 value oí Polygonum cuspidatum extract is 110 µg/ml in free radical scavenging assays, 3.2 µg/ml in superoxide radical scavenging...
Tipo: Journal article Palavras-chave: Antioxidant activity; Free radicals; Phenolics; Lipid peroxidation; DNA damage Polygonum cuspidatum.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000100002
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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 COMPOUNDS IN SKIN AND PULP OF FRUITS CHANGE AMONG GENOTYPES AND MATURITY STAGES IN HIGHBUSH BLUEBERRY (Vaccinium corymbosum L.) GROWN IN SOUTHERN CHILE J. Soil Sci. Plant Nutr.
Ribera,A.E; Reyes-Diaz,M; Alberdi,M; Zuñiga,G.E; Mora,M.L.
We evaluated the genotype and maturity effects on antioxidant activity and phenolic compounds of whole, skin and pulp fruits from three highbush blueberry cultivare (cv. Brigitta, cv. Bluegold and cv. Legacy) grown in southern Chile. Total antioxidant activity (TAA) in ripe fruits varied among the cultivare in the order Legacy > Brigitta > Bluegold. We found that TAA in unripe green and fully ripe fruits was high and similar between them, whereas the lowest levels were found in intermediate ripe fruits. The same trend was observed for fruit total phenolic content. This could be attributed to the higher concentrations of phenolic acids (mainly chlorogenic acid) and flavonols (mainly rutin) at immature fruit stages; whereas the high TAA in mature...
Tipo: Journal article Palavras-chave: Vaccinium corymbosum; Antioxidant compounds; Maturity stages; Phenolics; Anthocyanins.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000200010
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Antioxidative properties of tronchuda cabbage (Brassica oleraceae var. costata) external leaves against DPPH, superoxide radical, hydroxyl radical and hypochlorous acid IPB - Escola Superior Agrária
Vrchovska, V.; Sousa, C.; Valentão, P.; Ferreres, F.; Pereira, J.A.; Seabra, R.M.; Andrade, P.B..
The ability of the aqueous extract of tronchuda cabbage (Brassica oleracea L. var. costata DC) external leaves to act as a scavenger of DPPH- and reactive oxygen species (superoxide radical, hydroxyl radical and hypochlorous acid) was investigated. A phytochemical study was also undertaken, and thirteen phenolic compounds and five organic acids were identified and quantified. Tronchuda cabbage extracts exhibited antioxidant capacity in a concentration-dependent manner in all assays, although some pro-oxidant effect was also noticed. The samples with higher phenolic and organic acid contents displayed the major antioxidant potentials.
Tipo: Article Palavras-chave: Tronchuda cabbage; Brassica oleracea L. var. costata DC; DPPH; Superoxide radical; Hydroxyl radical; Hypochlorous acid; Phenolics; Organic acids.
Ano: 2006 URL: http://hdl.handle.net/10198/744
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Bioactive compounds and antioxidant capacities of 18 non-traditional tropical fruits from Brazil. Repositório Alice
RUFINO, M. do S. M.; ALVES, R. E.; BRITO, E. S. de; PÉREZ-JIMÉNEZ, J.; SAURA-CALIXTO, F.; MANCINI FILHO, J..
2010
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Tropical fruits; Phenolics; Antioxidants; ABTS; DPPH; FRAP.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/880820
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Chemical composition and antioxidant activity of tronchuda cabbage internal leaves IPB - Escola Superior Agrária
Ferreres, F.; Sousa, C.; Vrchovska, V.; Valentão, P.; Pereira, J.A.; Seabra, R.M.; Andrade, P.B..
A phytochemical study was undertaken on the internal leaves of tronchuda cabbage (Brassica oleracea L. var. costata DC). Seventeen phenolic compounds were characterized and quantified by reversed-phase HPLCDAD-ESI-MSn and HPLC/DAD, respectively: quercetin 3-O-sophoroside-7-O-glucoside, 3-p-coumaroylquinic acid, kaempferol 3-O-sophoroside-7-O-glucoside, kaempferol 3-O-(caffeoyl)-sophoroside-7-O-glucoside, sinapoyl glucoside acid, kaempferol 3-O-(sinapoyl)-sophoroside-7-Oglucoside, kaempferol 3-O-(feruloyl)-sophoroside-7-Oglucoside, kaempferol 3-O-(p-coumaroyl)-sophoroside- 7-O-glucoside, 4-p-coumaroylquinic acid, sinapic acid, kaempferol 3-O-sophoroside, 3 isomeric forms of 1,2- disinapoylgentiobiose, 1-sinapoyl-2-feruloylgentiobiose,...
Tipo: Article Palavras-chave: Tronchuda cabbage internal leaves; Brassica oleracea L. var. costata DC; Phenolics; Organic acids; Antioxidant capacity.
Ano: 2006 URL: http://hdl.handle.net/10198/738
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Colloidal gas aphron extraction of bioactive compounds from brazilian pinot noir grape pomace. Repositório Alice
BERES, C.; HOUSE, A.; TONON, R. V.; SILVA, C. M.; CABRAL, L. M. C.; JAUREGI, P..
Residues from the food industry are a problem worldwide. Alternatives have been developed in an attempted to extract compounds from fruit pomace in other to apply those as a natural component in different products. This work has the objective to produce two extracts: (1) ethanolic extract and (2) hot water extract; and characterize the chemical composition of these extracts for future application. In sequence an extraction using surfactants (Colloidal Gas Aphron) was applied in order to obtain a more concentrate and pure extract, in a foam form with better physical properties. The ethanolic extraction was more efficient, obtaining 4 times more bioactive compound (in 100g of pomace: 2670.63 mg Gallic Acid; 65.70 mg anthocyanins and 45,564.78 mmol of...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Colloidal Gas Aphron; Grape pomace; Phenolics; Antioxidante capacity; Anthocyanins.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1061084
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Contribution of essential oils and phenolics to the antioxidant properties of aromatic plants IPB - Escola Superior Agrária
Guimarães, Rafaela; Sousa, Maria João; Ferreira, Isabel C.F.R..
Different in vitro assays characterise most of the essential oils and phenolic compounds as antioxidants. These molecules can be found in a variety of aromatic plants and have been related to their bioactive properties. For the first time, a comparative study between the antioxidant properties of essential oils and phenolic extracts from Cistus ladanifer leaves, Citrus latifolia fruit peels, Cupressus lusitanica foliage and Eucalyptus gunnii leaves was performed. Overall, the antioxidant properties of phenolic extracts (unless scavenging activity of C. latifolia) were excellent and better than those obtained from the essential oils extracts, and even for the standards BHA (2-tert-butyl-4-methoxyphenol) and -tocopherol. The better EC50 values for all the...
Tipo: Article Palavras-chave: Aromatic plants; Essential oils; Phenolics; Antioxidant activity.
Ano: 2010 URL: http://hdl.handle.net/10198/2856
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Efeito do armazenamento na composicao fisica e quimica do grao de cafe em diferentes processamentos. Repositório Alice
LEITE, I.P.; VILELA, E.R.; CARVALHO, V.D. de.
Com o objetivo de determinar a influencia do tempo de armazenamento do tipo de secagem na composicao fisica e quimica dos graos de cafe, foram avaliados o peso de 100 graos, o teor de umidade, a atividade enzimatica da polifenoloxidase, os comostos fenolicos e a acidez, aos 0,4,7,9 e 12 meses de armazenamento. Concluiu-se que cafes verdes tiveram alto teor de fenolicos e baixos teores de umidade, atividade enzimatica, peso de graos e acidez. Cafes despolpados tiveram maior peso de graos; cafes secos em secador tiveram baixos peso de graos, umidade, atividade enzimatica e compostos fenolicos; o armazenamento influenciou nos componentes fisicos e quimicos dos graos de cafe.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Coffea arabica; Acidez; Fenolicos; Atividade enzimatica; Acidity; Phenolics; Enzimatic activity.
Ano: 1996 URL: http://www.alice.cnptia.embrapa.br/handle/doc/104065
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Effect of Harvest Time and L-Cysteine as an Antioxidant on Flesh Browning of Fresh-Cut Cherimoya (Annona cherimola Mill.) Chilean J. Agric. Res.
Campos-Vargas,Reinaldo; Defilippi,Bruno G; Romero Q,Paula; Valdés G,Héctor; Robledo M,Paula; Prieto E,Humberto.
Browning development is the most important factor limiting the quality of fresh-cut cherimoya (Annona cherimola Mill.). However, there is little information available about its causes and methods of control. The effectiveness of L-cysteine (0.125, 0.25 and 0.5%) in fresh-cut cherimoya harvested on two occasions (October and November) and stored for 6 and 12 days at 0 °C was studied. In order to understand the biological basis of browning, polyphenol oxidase (PPO) enzyme activity and total phenolic content in fresh-cut pieces were measured. Quality measurements and sensory analysis indicated that 0.5% L-cysteine was somewhat effective in reducing browning development, without affecting other quality attributes. In terms of physiological parameters, PPO...
Tipo: Journal article Palavras-chave: Antioxidants; Polyphenol oxidase; Phenolics; Sensorial evaluation.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300001
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Effect of methyl jasmonate treatments on the bioactive compounds and physicochemical quality of 'Fuji' apples Ciencia e Investigación Agraria
Öztürk,Burhan; Altuntas,Ebubekir; Yildiz,Kenan; Ozkan,Yakup; Saracoglu,Onur.
Recently, plant growth regulators have been used for various purposes in apples. Methyl jasmonate (MeJA) has significant effects on the physiology, postharvest biology, processing, and chemical composition of apples. In the present study, the effects of MeJAMeJa treatments on the physicochemical quality and bioactive compounds (total antioxidant activity, total phenolics, and total anthocyanins) of 'Fuji' apples were investigated. The following doses of MeJa were used: 0 (control); 1; 120; 2,240; and 4,480 mg L-1. The highest geometric mean diameter, fruit mass, flesh firmness and skin thickness were obtained from the 2,240 mg L-1 MeJA treatment. Fruits harvested from control trees exhibited the highest total soluble solids content (TSSC) and pH, whereas...
Tipo: Journal article Palavras-chave: Apple; Antioxidant; Color; Firmness; Methyl jasmonate; Phenolics.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100018
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Evaluation of seasonal antioxidant activity and total phenolic compounds in stems and leaves of some almond (Prunus amygdalus L.) varieties Biol. Res.
Sivaci,Aysel; Duman,Sevcan.
BACKGROUND: This study aimed to determine the seasonal changes of total antioxidant activity and phenolic compounds in samples taken from leaves (April, July, October) and stems (April, July, October, January) of some almond (Prunus amygdalus L.) varieties (Nonpareil, Ferragnes and Texas). RESULTS: It was indicated that antioxidant activity and phenolic compounds in leaves and stems of Nonpareil, Ferragnes and Texas showed seasonal differences. Antioxidant activity IC50 of these varieties reached the highest value in April for leaves whereas in October for stems. The highest level of total phenolic compounds was in January for stems while in October for leaves. CONCLUSIONS: These results showed that total antioxidant activity and phenolics in leaves and...
Tipo: Journal article Palavras-chave: Almond; Antioxidant activity; Phenolics; Prunus amygdalus; Seasonal changes.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100009
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Hazel (Corylus avellana L.) leaves as source of antimicrobial and antioxidative compounds IPB - Escola Superior Agrária
Oliveira, I.; Sousa, A.; Valentão, P.; Andrade, P.B.; Ferreira, Isabel C.F.R.; Ferreres, F.; Bento, Albino; Seabra, R.M.; Estevinho, Leticia M.; Pereira, J.A..
Aqueous extracts of leaves of different hazel (Corylus avellana L.) cultivars (Cv. M. Bollwiller, Fertille de Coutard and Daviana), were analysed by reversed-phase HPLC/DAD for the definition of their phenolic composition. Antioxidant potential was assessed by the reducing power assay, and the scavenging effect on DPPH (2,2-diphenyl-1-picrylhydrazyl) radicals and b-carotene linoleate model system. Their antimicrobial capacity was also tested against Gram positive (Bacillus cereus, Bacillus subtilis, Staphylococcus aureus) and Gram negative bacteria (Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae) and fungi (Candida albicans, Cryptococcus neoformans). Eight phenolic compounds were identified: 3-, 4- and 5-caffeoylquinic acids,...
Tipo: Article Palavras-chave: Hazel leaves; Phenolics; Antioxidant potential; Antimicrobial activity.
Ano: 2007 URL: http://hdl.handle.net/10198/753
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Improving drought tolerance of quinoa plant by foliar treatment of trehalose CIGR Journal
Dawood, Mona Gergis.
Two field experiments were conducted during two successive seasons (2014/2015 and 2015/2016) at the Experimental Station of National Research Centre, Nubaria district, Beheira Governorate, Egypt, to study the effect of foliar treatment of quinoa plants with trehalose (Tre) (100µM and 500µM) on growth, photosynthetic pigments, seed yield quantity & quality, in fever of nutritional and antioxidant compounds in the yielded quinoa seeds which subjected to water deficiency (skipping two irrigation times at 50 & 60 days after sowing). Water deficiency caused marked decreases in quinoa plant growth parameters (shoot height, fresh and dry weights of shoot/plant) and photosynthetic pigments with marked increases in root growth parameters (root length, fresh...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant activity; Drought; Flavonoids; Oil; Phenolics; Protein; Quinoa; Trehalose.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4539
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In search of synergistic effects in antioxidant capacity of combined edible mushrooms IPB - Escola Superior Agrária
Queirós, Bruno; Barreira, João C.M.; Sarmento, Ana C.; Ferreira, Isabel C.F.R..
The antioxidant activity of different edible mushrooms was evaluated considering the different contribution of individual and combined extracts. The radical scavenging capacity was evaluated through hydrogen atom transfer and single electron transfer reaction-based assays: DPPH radical scavenging activity and reducing power, respectively. The inhibition of lipid peroxidation was studied in lipossomes solutions by the beta-carotene-linoleate system. Three types of interactions (synergistic, additive and negative synergistic effects) were observed, synergism being the most abundant effect. Marasmius oreades is present in the mixtures with higher antioxidant properties and synergistic effects, while Cantharellus cibarius is present in the mixtures with lowest...
Tipo: Article Palavras-chave: Mushrooms; Antioxidant activity; Phenolics; Synergism; Discriminant analysis.
Ano: 2009 URL: http://hdl.handle.net/10198/2647
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