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| Registros recuperados: 129 | |
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| GALLEGO RÚA,Adriana María; HENAO RAMÍREZ,Ana María; URREA TRUJILLO,Aura Inés; ATEHORTÚA GARCÉS,Lucía. |
| In order to understand the causes of lack of regeneration in cacao somatic embryos, two cacao varieties with different responses to regeneration potential were described based on their capacity to store different compounds. It is well known that seed reserves play a central role in the regenerative capability of somatic embryos; thus, we followed histochemical changes and reserve fluctuations of proteins, polysaccharides and polyphenols during somatic embryogenesis (SE) in the two cacao varieties. The study showed that, in somatic embryos of the regenerating variety, polyphenols were localized mainly in the periphery of the embryo (epidermal cells) and proteins were the main storage substance in the embryo expression medium, while the non-regenerating... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidants; Histology; Reserve accumulation; Recalcitrance; Somatic embryogenesis. |
| Ano: 2016 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2016000200002 |
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| Klein,Fátima Rosane S.; Reis,Andressa; Kleinowski,Alítcia M.; Telles,Renata T.; Amarante,Luciano do; Peters,José A.; Braga,Eugenia Jacira B.. |
| ABSTRACT Ultraviolet B radiation has been described as a potential elicitor agent of the synthesis of secondary metabolites in plants. Thus, the present study aimed to investigate the production of betalains and total flavonoids, as well as the antioxidant activity, of Alternanthera sessilis, A. brasiliana, A. tenella and A. philoxeroides exposed to different periods of UV-B radiation (280-315 nm). Plants of these four species were exposed to UV-B radiation for 0, 2, 4, 6, and 8 hours, which amounts to 0, 10, 20, 30, and 40 J cm−2 of radiation, respectively. Significant increases in betacyanin and betaxanthin levels were observed in A. sessilis and A. brasiliana during the period of UV-B exposure, while no differences were observed for the others species.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abiotic elicitor; Antioxidants; Flavonoids; Medicinal plants; Pigments; Ultraviolet radiation. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400615 |
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| Valentim, jean kaique; Bittencourt, Tatiana Marques; Lima, Heder José D'Àvilla; Barros, Fernanda Keller Queiroz; Almeida, Guilherme Resende de; Ziemniczak, Henrique Momo. |
| The objective of this study was to evaluate productive performance and egg quality of Japanese quails (Cortunix japonica) fed with synthetic and natural pigments. The treatments used were: 0.8% paprika extract (Capsicum annuum), 0.8% marigold flower extract, 4% paprika extract and 4% marigold flower extract and 0.045% synthetic pigment (Canthaxanthin) in feed. A total of 240 Japanese quails at 20 weeks of age were distributed in a completely randomized experimental design with five treatments and six replicates, with eight quails per experimental unit (30 experimental units). There was no difference (p > 0.05) for the evaluated parameters, except for yolk color which showed significant difference (p < 0.05) between the treatments used. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidants; Canthaxanthin; Yolk color; Plant extracts. |
| Ano: 2020 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/47364 |
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| Ortiz-Robledo,Faviola; Villanueva-Fierro,Ignacio; Oomah,B. Dave; Lares-Asef,Ismael; Proal-Nájera,J. Bernardo; Návar-Chaidez,J. Jesús. |
| Oat (Avena sativa L.) is a cereal grain, its seeds are rich in nutrients, is consumed as whole grain with health benefits fot humans due to its antioxidants, such as the avenanthtamides (Avns). The contents of Avns 2c, 2f and 2p were evaluated by HPLC in groats and hulls of oat varieties Chihuahua, Cuauhtemoc, Raima and Avemex cultivated in Durango, México. The association of these Avns with protein, fat, crude fiber and ash of oat was also investigated. A 4x2 bifactorial design was used, with the number of varieties and groats ot hulls as factors. Avns contents differed significantly (p<0.05) among oat varieties, groats and hulls. Avemex groats had the highest concentrations of Avns: 3.6±0.7, 3.0±0.5 and 3.3±0.6 mg kg-1 fot 2c, 2f and 2p Avns. Avemex... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidants; Groats; Hulls; Oat; Polyphenols. |
| Ano: 2013 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952013000300002 |
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| Augusto,Ohara; Trindade,Daniel F.; Linares,Edlaine; Vaz,Sandra M.. |
| The substantial therapeutic potential of tempol (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy) and related cyclic nitroxides as antioxidants has stimulated innumerous studies of their reactions with reactive oxygen species. In comparison, reactions of nitroxides with nitric oxide-derived oxidants have been less frequently investigated. Nevertheless, this is relevant because tempol has also been shown to protect animals from injuries associated with inflammatory conditions, which are characterized by the increased production of nitric oxide and its derived oxidants. Here, we review recent studies addressing the mechanisms by which cyclic nitroxides attenuate the toxicity of nitric oxidederived oxidants. As an example, we present data showing that tempol... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyclic nitroxides; Tempol; Antioxidants; Nitric oxide-derived oxidants; Inflammation; Acetaminopheninduced hepatotoxicity. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100013 |
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| GRANDE-TOVAR,CARLOS D.; JOHANNES,DELGADO-OSPINA; PUERTA,LUISA F.; RODRÍGUEZ,GLORIA C.; SACCHETTI,GIAMPIERO; PAPARELLA,ANTONELLO; CHAVES-LÓPEZ,CLEMENCIA. |
| Abstract: Ackee (Blighia sapida K. D. Koenig) is an exotic fruit widely consumed in the Caribbean countries. While there is extensive research on the presence of hypoglycin A, other bioactive compounds have not been studied. We identified and quantified the changes in bioactive molecules (total phenol, ascorbic acid, hypoglycin A, squalene, D: A-Friedooleanan-7-ol, (7.alpha.), and oleic acid), antioxidant potential, and volatile compounds during two stages of ripe. A clear reduction in hypoglycin A, ascorbic acid, and total polyphenols during the maturation process were observed. On the contrary, oleic acid, squalene, and D: A-Friedooleanan-7-ol, (7.alpha.) contents increased about 12, 12, and 13 times, respectively with advancing maturity. These bioactive... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidants; Friedooleanan; Hypoglycin; Polyphenols; Squalene. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500616 |
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| SILVA,GABRIELA L. DA; LUFT,CAROLINA; LUNARDELLI,ADROALDO; AMARAL,ROBSON H.; MELO,DENIZAR A. DA SILVA; DONADIO,MÁRCIO V.F.; NUNES,FERNANDA B.; AZAMBUJA,MARCOS S. DE; SANTANA,JOÃO C.; MORAES,CRISTINA M.B.; MELLO,RICARDO O.; CASSEL,EDUARDO; PEREIRA,MARCOS AURÉLIO DE ALMEIDA; OLIVEIRA,JARBAS R. DE. |
| Several studies have investigated the antinociceptive, immunomodulatory and anti-inflammatory properties of compounds found in the lavender essential oil (LEO), however to date, there is still lack of substantial data. The objective of this study was to assess the antioxidant, anti-inflammatory and antinociceptive effects of lavender essential oil. The 1,1-diphenyl-2-picrylhydrazyl radical decolorization assay was used for antioxidant activity evaluation. The anti-inflammatory activity was tested using two models of acute inflammation: carrageenan-induced pleurisy and croton oil-induced ear edema. The antinociceptive activity was tested using the pain model induced by formalin. LEO has antioxidant activity, which is dose-dependent response. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidants; Inflammation; Lavender; Nociception. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301397 |
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| VEBER,BRUNO; CAMARGO,ANDERSON; DALMAGRO,ANA PAULA; BONDE,HENRIQUE LUIS P.; MAGRO,DÉBORA D. DAL; LIMA,DANIELA D. DE; ZENI,ANA LÚCIA B.. |
| Abstract Red cabbage (Brassica oleracea L. var. capitata f. rubra DC.) extract has been demonstrated hypolipidemic and antioxidant capacity. Herein, we investigated the effect of red cabbage aqueous extract (RC) or fenofibrate (FF) in oxidative stress induced by Triton WR-1339 in rats. The antioxidant capacity was evaluated through the superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) activities and, thiobarbituric reactive species (TBARS) and protein carbonyl (PC) levels in erythrocytes, liver, kidneys, cerebral cortex and hippocampus of male rats. The alterations promoted by Triton WR-1339 in enzymatic antioxidant defense in the liver, kidneys and hippocampus were reversed by RC or FF treatments. The TBARS and PC levels... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Red cabbage; Brassica oleracea; Oxidative stress; Antioxidants; Triton WR-1339. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100711 |
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| OLIVEIRA,CARLOS H.M.; SIMÃO,ANDERSON A.; TRENTO,MARCUS V.C.; CÉSAR,PEDRO H.S.; MARCUSSI,SILVANA. |
| ABSTRACT The enzyme inhibition by natural and/ or low-cost compounds may represent a valuable adjunct to traditional serotherapy performed in cases of snakebite, mainly with a view to mitigate the local effects of envenoming. The objective of this study was to evaluate possible interactions between vitamins and enzymes that comprise Bothrops atrox and Crotalus durissus terrificus venoms, in vitro. Proteolysis inhibition assays (substrates: azocasein, collagen, gelatin and fibrinogen), hemolysis, coagulation, hemagglutination were carried out using different proportions of vitamins in face of to inhibit minimum effective dose of each venom. The vitamins were responsible for reducing 100% of breaking azocasein by C.d.t. venom, thrombolysis induced by B.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antiophidian properties; Antioxidants; Blood cells; Hemostatic processes; Natural inhibitors. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000502005 |
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| Sollecito,N.V.; Pereira,E.C.M.; Grázia,J.G.V.; Neves,B.P.; Couto,B.V.R.; Andrade,V.B.; Miranda,M.S.; Silva,J.K.R.; Borges,A.M.. |
| ABSTRACT The aim of this study was to evaluate the supplementation of embryo culture medium with antioxidant obtained from oily extract of Lippia origanoides on in vitro blastocyst development and quality. Oocytes collected from slaughterhouse ovaries were matured and fertilized in vitro following standard laboratory procedures. Zygotes were cultured in SOF medium supplemented according to the following treatments: T1 embryo culture medium without antioxidant supplementation; T2)50μM/mL Cysteamine; T3)2.5μg/mL; T4)5.0μg/mL and T5)10.0μg/mL of antioxidant obtained from oily extract of Lippia origanoides. On the seventh day of culture, the blastocysts were fixed and evaluated for apoptosis rates, number of total cell and inner cell mass cells by means of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidants; Apoptosis; Lippia origanoides; In vitro embryo production. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000300723 |
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| Silva,E.C.B.; Arruda,L.C.P.; Vieira,J.I.T.; Soares,P.C.; Guerra,M.M.P.. |
| ABSTRACT The aim of this study was to evaluate the effects of different concentrations of (+)-catechin or (-)-epigallocatechin gallate (EGCG) on goat semen freezability. Poolsof semen were processed (Experiment 1: 0, 15, 25, 50, 75, or 100µM (+)-catechin; Experiment 2: 0, 15, 25, 50, 75, or 100µM EGCG) and frozen. After thawing, the samples were evaluated for kinematics, plasma membrane (PMi) and acrosome integrity, morphology, and oxidative stress, at 0 and 1h. In Experiment 1, at 0h, VSL and VAP were greater (P<0.05) with 15µM than with 50 and 100; WOB was lower (P<0.05) with 100µM than with 0, 15, and 25; and BCF was higher (P<0.05) with 75 and 100µM than with 0. In turn, in Experiment 2, progressive motility was higher (P<0.05) with0 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidants; Cryopreservation; Flavonoids; Oxidative stress; Semen. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000200521 |
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| LOTITO,SILVINA B; FRAGA,CESAR G. |
| We evaluated the interaction between ascorbic acid (AA) and (+)-catechin (CTCH) in potassium phosphate solution, pH 7.4 (PPS) and in human plasma. In both systems, the oxidation was started by adding 2,2-azobis-(2-amidinopropane) clorhidrate (AAPH). The concentrations of AA and CTCH were determined by HPLC using electrochemical detection. In PPS, CTCH was oxidized by AAPH (50 muM), in either the absence or presence of different initial concentrations of AA (25-200 muM). In the presence of AA, CTCH depletion was delayed, an effect that was dependent upon the initial concentration of AA. When 100 muM AA was added after the oxidation had begun, CTCH depletion was arrested for 30 min. The kinetics of AA oxidation by AAPH was also characterized in PPS. AA (100... |
| Tipo: Journal article |
Palavras-chave: Catechins; Antioxidants; Free radicals; Procyanidins. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200015 |
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| PRADEEP,KANNAMPALLI; RAJ MOHAN,CHANDRASEKARAN VICTOR; GOBIANAND,KUPANNAN; KARTHIKEYAN,SIVANESAN. |
| Diethylnitrosamine (DEN), found in many commonly consumed foods, is widely reported to induce cancer in animals and humans. The aim of the present study was to investigate the hepatoprotective and antioxidant activities of the leaf extract of the medicinal plant Cassia fistula Linn. against diethylnitrosamine induced liver injury in ethanol pretreated rats. Albino Wistar rats, pretreated with ethanol for 15 days, were administered a single dose of DEN. Thirty days after DEN administration, hepatotocellular damage was observed histologically, along with elevated levels of serum AST, ALT, ALP, LDH, γ-GT and bilirubin and a simultaneous fall in the levels of the marker enzymes in the liver tissue. Liver oxidative stress was confirmed by elevated... |
| Tipo: Journal article |
Palavras-chave: Antioxidants; Cassia fistula; Diethylnitrosamine; Hepatoprotective; Lipid peroxidation; Silymarin. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000100013 |
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| MORIEL,PATRICIA; PLAVNIK,FRIDA L; ZANELLA,MARIA T; BERTOLAMI,MARCELO C; ABDALLA,DULCINEIA SP. |
| Lipid peroxidation and lipid-derived oxidized products have been implicated in the pathogenesis of a variety of human diseases. To clarify the role of oxidative stress in essential hypertension and hypercholesterolemia the in vitro oxidative susceptibility of LDL, the antioxidant status and the lipid peroxide content of blood plasma were examined in hypercholesterolemic (HC), hypertensive (H), hypercholesterolemic/hypertensive (HH) and normolipidemic/normotensive subjects (N). Plasma ascorbate and lipid-soluble antioxidants were lower, while LDL oxidizability, CE-OOH and TL-OOH were higher in H, HC, and HH groups than in the N group. No difference was observed among groups for PL-OOH and isoprostanes. In summary, the results show that: 1) lipid- and... |
| Tipo: Journal article |
Palavras-chave: Lipoprotein oxidation; Lipid peroxides; Isoprostanes; Antioxidants; Atherosclerosis; Oxidative stress. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200010 |
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| 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 |
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| Registros recuperados: 129 | |
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