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| Registros recuperados: 195 | |
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| Gomes, Ana; Fernandes, Eduarda; Silva, Artur; Pinto, Diana; Santos, Clementina M.M.; Cavaleiro, José; Lima, José Costa. |
| 2-Styrylchromones are a small group of naturally occurring chromones, vinylogues of flavones (2-phenylchromones). Natural and synthetic 2-styrylchromones have been tested in different biological systems, showing activities with potential therapeutic applications. In particular, the potential and hitherto understudied antioxidant behavior of these compounds has been raised as a matter of interest. Thus the present work consisted in the study of the in vitro scavenging activities for reactive oxygen species (ROS) and reactive nitrogen species (RNS) of various 2-styrylchromone derivatives and structurally similar flavonoids. Some of the studied 2-styrylchromones proved to be extremely efficient scavengers of the different ROS and RNS, showing, in some cases,... |
| Tipo: Article |
Palavras-chave: 2-Styrylchromones; Reactive oxygen species; Reactive nitrogen species; Scavenging activity; Antioxidant activity. |
| Ano: 2007 |
URL: http://hdl.handle.net/10198/3922 |
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| ROSA,Luísa Ozorio Lopes da; SANTANA,Marcelo Cerutti; AVEZEDO,Tatiana Lima; BRÍGIDA,Ana Iraidy Santa; GODOY,Ronoel; PACHECO,Sidney; MELLINGER-SILVA,Caroline; CABRAL,Lourdes Maria Correa. |
| Abstract Whey is well-known for the functional and bioactive properties of its proteins and peptides, which are of great interest to food and nutraceutical industries. The aim of this study was to investigate the effect of four different commercial proteases (Novo ProD® (NPD), Alcalase® (ALC), Pancreas Trypsin® (TRY), and Flavourzyme® (FLA)) in the generation of hydrolysates with emulsifying and antioxidant activities. Hydrolysis processes were carried out for 5 h, reaching maximum degrees of 18.5, 15.5, 9.2, and 8.7% for NPD, ALC, TRY, and FLA, respectively. All tested enzymes generated very diverse, but conservative peptide profiles when comparing the treatments along the time, with the main enzymatic actions up to 120 min-reaction. An increase in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Whey protein; Hydrolysis; Functionality; Emulsification; Antioxidant activity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000500031 |
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| Froufe, Hugo J.C.; Abreu, Rui M.V.; Ferreira, Isabel C.F.R.. |
| Wild mushrooms have been described as sources of natural antioxidants, particularly phenolic compounds. However, many other compounds present in wild mushrooms can also act as antioxidants (reducers), so whole extracts from a wide range of species need to be examined. To gain further knowledge in this area, the relationship between the antioxidant potential (scavenging effect and reducing power) and chemical composition of twenty three samples from seventeen Portuguese wild mushroom species was investigated. A wide range of analytical parameters reported by our research group (including ash, carbohydrates, proteins, fat, monounsaturated fatty acids, polyunsaturated fatty acids, saturated fatty acids, phenolics, flavonoids, ascorbic acid and -carotene)... |
| Tipo: Article |
Palavras-chave: Wild mushrooms; Chemical composition; Antioxidant activity; QCAR; PLS. |
| Ano: 2009 |
URL: http://hdl.handle.net/10198/2615 |
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| TAMER,Canan Ece; YEKELER,Fatma Zehra; ÇOPUR,Ömer Utku; İNCEDAYI,Bige; SUNA,Senem. |
| Abstract The aim of the present work was to design new beverages using lemonade and some herbal extracts (linden, heather, green tea, lemon verbena, clove, peppermint, ginger and mate) rich in vitamin C and flavonoids. The linden-added lemonade showed the highest value (597.9 mg/kg) for ascorbic acid content, whereas the lemon verbena-added lemonade showed the lowest value (486.04 mg/kg). The amount of saccharose was changed by 11.07-11.58%, the glucose by 1.11-1.62% and the fructose between 11.07-11.58% in the beverages. K, Na, Mg and P values in the lemonades were determined in the range of 178.83-210.98 mg/kg, 33.75-39.13 mg/kg, 22.37-27.89 mg/kg and 7.22-10.04 mg/kg, respectively. The total phenolic content in the samples changed between 315.11-397.57... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lemonade; Beverage; Herbal extract; Antioxidant activity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612017000100045 |
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| Qiu,Congyang; Zhu,Tonglin; Lan,Liying; Zeng,Qingmao; Du,Zhiguo. |
| ABSTRACT Maceaene and macamide contents as well as antioxidant effect of petroleum ether extract of black maca (BM), yellow maca (YM), and purple maca (PM) on diabetes mellitus (DM) rats were investigated. The results showed that seven, six, and five analogues of macamides were identified from the petroleum ether extracts of BM, YM, and PM, respectively. BM extract exhibited the highest contents of total macamides. Comparatively, the PM extract has the lowest macamide quantity. The maceaene contents in all the extracts showed no significant difference (p>0.05). Macamide contents in maca with the same color were not statistically different. Pharmacological results showed that 60-day oral administration of the petroleum ether extract of maca (100 mg/kg.d)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Maca extract; Antioxidant activity; Maceaene; Macamide; Diabetes mellitus rat. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100326 |
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| Lima,Annete de Jesus Boari; Corrêa,Angelita Duarte; Saczk,Adelir Aparecida; Martins,Mariana Pereira; Castilho,Rachel Oliveira. |
| Different solvents were evaluated for the extraction of jabuticaba anthocyanin pigments, identifying, quantifying and verifying the stability of the anthocyanins, as well as the conduction of three antioxidant activity assays and determination of the vitamin C levels. The maceration with ethanol acidified with HCl 1.5 mol L-1 (85:15) provides better pigment extraction and stability. The skin is anthocyanin rich, presenting 1.59 and 2.06 g 100 g-1 of dry matter in the Paulista and Sabará varieties, respectively. Cyanidin 3-glucoside is the majority pigment of the skins, followed by delphinidin 3-glucoside. The highest level of vitamin C was found in the skins and seeds of both varieties. It was verified that the skins, presented more antioxidant activity,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Jabuticaba; Anthocyanin; Method of extraction; Vitamin C; Antioxidant activity. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000300023 |
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| Ingkasupart,Pajaree; Manochai,Benya; Song,Woo Tae; Hong,Jeong Hwa. |
| Antioxidant activities and total phenolic content (TPC) were analyzed in ethanol extracts of 11 marigold cultivars grown in Thailand. Antioxidant activity assays performed in this study were the 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical cation scavenging activity, ferric ion reducing antioxidant power (FRAP), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, oxygen radical absorbance activity (ORAC), and superoxide anion radical scavenging activity (SRSA) assays. ‘Optiva Orange’ showed the best activity in the ORAC assay and in % SRSA, as well as the highest content of lutein (20.59 mg), gallic acid (25.77 mg), and quercetin (12.61 mg) per gram dry marigold petal among the 11 cultivars. Furthermore, ‘Optiva... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Marigold cultivars; Antioxidant activity; Phytochemical. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000200380 |
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| Yang,Xuena; Yan,Fen; Huang,Shangrong; Fu,Caili. |
| The antioxidant activities of ethanolic crude extract (LPCE) and its four different solvent sub-fractions (namely, diethyl ether fraction (LPDF), ethyl acetate fraction (LPEF), n-butyl alcohol fraction (LPBF) and residue fraction (LPR)) from longan pericarps were investigated employing various systems including 2,2-diphenyl-1-picrylhydrazyl (DPPH)/ 2,2'-amino-di(2-ethyl-benzothiazoline sulphonic acid-6)ammonium salt (ABTS)/hydroxyl radical scavenging activity, total phenolic content and reducing power. Each extract showed concentration-dependent antioxidant activity. LPEF showed the highest scavenging activity against DPPH, ABTS and hydroxyl radicals with EC50 values of 0.506, 0.228 and 4.489 mg/mL, respectively. LPEF showed the highest reducing power with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Longan pericarp; Extract; Free radicals; Antioxidant activity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612014000200018 |
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| Ferreira, Isabel C.F.R.; Barros, Lillian; Soares, Maria Elisa; Bastos, Maria de Lourdes; Pereira, J.A.. |
| Olive trees (Olea europaea L. Cv. Cobranc¸osa) from the northeast of Portugal were sprayed with three different copper formulations [bordeaux mixture (copper sulphate + calcium hydroxide - 20% Cu), copper hydroxide (40% Cu) and copper oxychloride (50% Cu)] to control olive fungal diseases. The residues of copper in olive leaves, harvested at different times, were evaluated by atomic absorption spectrometry. At all the collection times, treated olive leaves had significantly higher copper contents, compared to the control. The different copper amounts in pesticide formulations lowered the leaves contents in total phenols and hence their antioxidant properties. Olive leaves sprayed with copper oxychloride possessed the highest copper levels and the lowest... |
| Tipo: Article |
Palavras-chave: Olea europaea; Olive leaves; Copper; Phenols; Antioxidant activity. |
| Ano: 2007 |
URL: http://hdl.handle.net/10198/749 |
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| Rivero,F.; Fallarero,A.; Castañeda,O.; Dajas,F.; Manta,E.; Areces,F.; Mancini Filho,J.; Vidal,A.. |
| The aim of the present paper was to provide the evidences for the antioxidant activity in Halimeda incrassata (Ellis) Lamouroux aqueous extracts obtained after simple water extraction of the fresh algae at room temperature (23°C). Previously in the literature, only antioxidant activity associated to carotenoids fractions of seaweeds has been reported. From different species of seaweeds, Halimeda incrassata aqueous extract exhibited the highest antioxidant activity on the inhibition of TBARS formed during the spontaneous lipid peroxidation of rat brain homogenates with an IC50 of 0.340mg.mL-1. Halimeda incrassata aqueous extract (0.5mg.mL-1), was also capable of decreasing the in vitro generation of hydrogen peroxide by two distinct metabolic pathways... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidant activity; Halimeda incrassata; Algae; Functional food. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612003000200026 |
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| 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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| Dandlen, S. Anahi; Lima, A. Sofia; Mendes, Marta D.; Miguel, M. Graça; Faleiro, M. Leonor; Sousa, Maria João; Pedro, Luis G.; Barroso, José G.; Figueiredo, A. Cristina. |
| The essential oils of Thymus caespititius, T. camphoratus, T. capitellatus, T. carnosus, T. pulegioides, T. zygis subsp. zygis and T. zygis subsp. sylvestris collected in diff erent regions of Portugal, including the Azores islands, were evaluated for preventing lipid peroxidation and scavenging free radicals, and hydroxyl and superoxide anions. T. zygis subsp. zygis oil possessed the best capacity for preventing lipid peroxidation (IC50 = 0.030 ± 0.003 mg/ml), immediately followed by the oils isolated from T. zygis subsp. sylvestris collected in diff erent regions of Portugal. IC50 values ranged from 0.066 ± 0.003 to 0.087 ± 0.001 mg/ml in oils isolated from samples from Alcanena and Duas Igrejas, respectively. The oils isolated from T. zygis subsp.... |
| Tipo: Article |
Palavras-chave: Thymus; Lamiaceae; Labiatae; Antioxidant activity; Essential oils. |
| Ano: 2010 |
URL: http://hdl.handle.net/10198/4474 |
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| Registros recuperados: 195 | |
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