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Registros recuperados: 10
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Actividad antioxidante de alcaloides de Erythrina americana Miller. Colegio de Postgraduados
Ibarra Estrada, Emmanuel.
Los alcaloides son compuestos que presentan efectos fisiológicos y propiedades farmacológicas a bajas concentraciones. Los objetivos de este estudio fueron extraer y aislar fracciones crudas de alcaloides y el compuesto erisodina de semillas de E. americana, estimar sus rendimientos y evaluar la actividad antioxidante de fracciones crudas de alcaloides y del compuesto puro erisodina. La actividad antioxidante de las fracciones de alcaloides libres hexánicos, libres metanólicos, liberados metanólicos y de erisodina se evaluó mediante el método del radical estable 2,2-difenil-1-picrilhidrazilo (DPPH) que al reaccionar con un antirradical sufre una decoloración de azul-violeta a amarillo; dicha reacción se midió espectrofotométricamente. Entre las fracciones...
Palavras-chave: Radical libre; Antirradical; Erisodina; Alcaloides; Erythrina americana; Free radical; Antiradical; Erysodine; Alkaloids; Maestría; Fisiología Vegetal.
Ano: 2010 URL: http://hdl.handle.net/10521/221
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Actividad antioxidante de alcaloides de Erythrina americana Miller. Colegio de Postgraduados
Ibarra Estrada, Emmanuel.
Los alcaloides son compuestos que presentan efectos fisiológicos y propiedades farmacológicas a bajas concentraciones. Los objetivos de este estudio fueron extraer y aislar fracciones crudas de alcaloides y el compuesto erisodina de semillas de E. americana, estimar sus rendimientos y evaluar la actividad antioxidante de fracciones crudas de alcaloides y del compuesto puro erisodina. La actividad antioxidante de las fracciones de alcaloides libres hexánicos, libres metanólicos, liberados metanólicos y de erisodina se evaluó mediante el método del radical estable 2,2-difenil-1-picrilhidrazilo (DPPH) que al reaccionar con un antirradical sufre una decoloración de azul-violeta a amarillo; dicha reacción se midió espectrofotométricamente. Entre las fracciones...
Palavras-chave: Radical libre; Antirradical; Erisodina; Alcaloides; Erythrina americana; Free radical; Antiradical; Erysodine; Alkaloids; Maestría; Fisiología Vegetal.
Ano: 2010 URL: http://hdl.handle.net/10521/221
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Antihypoxic, nephroprotective and antioxidant properties of hydro-alcoholic extract of loquat flowers ArchiMer
Nabavi, Seyed Fazel; Nabavi, Seyed Mohammad; Moghaddam, Akbar Hajizadeh; Hellio, Claire; Ebrahimzadeh, Mohammad Ali.
Objectives: Loquat is well known Chinese medicinal herb with numerous traditional usages. The fact of the promising effect of loquat on different diseases is approved by a plethora of recent studies. Methods: In the present study antihypoxic, antioxidant and nephroprotective activity of hydro-alcoholic extract of Eriobotrya japonica flower was an investigated employing different in vivo and in vitro assay system. The chemical analysis of Eriobotrya japonica flowers, using atomic absorption spectroscopy, highlighted the presence of eight elements. Gallic acid, rutin and quercetin were determined by HPLC/DAD. Results: Results indicated that the hydro-alcoholic extract has a protective effect against hypoxia induced lethality in mice. Extract at doses of 200...
Tipo: Text Palavras-chave: Free radical; Eriobotrya japonica; Gentamicin; Rutin.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00299/40980/73190.pdf
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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 isolated from Schisandra propinqua (Wall.) Baill Biol. Res.
HUANG,FENG; XU,LIJIA; GANGGANG,SHI.
Schisandra propinqua (Wall.) Baill.(Schisandraceae) is widely used as a Chinese folk medicine. In this study, activity-guided fractionation of the ethanol extract from the stem of Schisandra propinqua led to the isolation of four extracts. Subsequently, a neolignan 4,4-di(4-hydroxy-3-methoxyphenly)-2,3-dimethylbutanol was isolated from the EtOAc part of the stem of Schisandra propinqua, the free radical scavenging activities of which were researched in vitro. The present work demonstrated that extracts and pure compound possessed scavenging activities to DPPH, superoxide anions and hydroxy radical, and could depress lipid peroxidation reaction induced by oxygen radical produced by the Fe2+/cysteine system in vitro. This suggests that the traditional...
Tipo: Journal article Palavras-chave: Antioxidant; Free radical; Lipid peroxidation; Schisandra propinqua.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300009
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CARBOHYDRATES, PHENOLIC COMPOUNDS AND ANTIOXIDANT ACTIVITY IN PULP AND PEEL OF 15 BANANA CULTIVARS Rev. Bras. Frutic.
AQUINO,CÉSAR FERNANDES; SALOMÃO,LUIZ CARLOS CHAMHUM; RIBEIRO,SÔNIA MACHADO ROCHA; SIQUEIRA,DALMO LOPES DE; CECON,PAULO ROBERTO.
ABSTRACT The aim of this study was to quantify and compare the levels of carbohydrates and phenolic compounds and the antioxidant activity in the pulp and peel of 15 banana cultivars in two ripening stages. Four bunches per cultivar were harvested in the pre-climacteric stage, six fruits were used by sample unit. Fruits were analyzed in the pre-climacteric stage and after ripening. Total, reducing and non-reducing soluble sugars, starch, phenolic compounds and antioxidant activity were evaluated. Cultivar and ripening stage influenced all characteristics analyzed. Unripe pulp and peel had small percentage of sugar, but high percentage of starch, especially ‘Terrinha’ and ‘Marmelo’ cultivars. AAB and ABB cultivars presented the highest percentages of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Musa spp.; Soluble sugars; Starch; Free radical.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000400901
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Cellular aging: theories and technological influence BABT
Mercado-Sáenz,Silvia; Ruiz-Gómez,Miguel J.; Morales-Moreno,Francisco; Martínez-Morillo,Manuel.
The aim of this article was to review the factors that influence the aging, relationship of aging with the biological rhythms and new technologies as well as the main theories to explain the aging, and to analysis the causes of aging. The theories to explain the aging could be put into two groups: those based on a program that controlled the regression of the organism and those that postulated that the deterioration was due to mutations. It was concluded that aging was a multifactorial process. Genetic factors indicated the maximum longevity of the individual and environmental factors responsible for the real longevity of the individual. It would be necessary to guarantee from early age the conservation of a natural life rhythm.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aging; Longevity; Biological rhythms; Caloric restriction; Telomerase; Free radical.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000600008
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Microstructural and rheological properties of irradiated rice Ciência e Agrotecnologia
Guimarães,Ívina Catarina de Oliveira; Pereira,Joelma; Cornélio,Vanda Maria de Oliveira; Batista,Luiz Roberto; Ferreira,Eric Batista.
The culinary quality of rice directly results in its market value and consumer acceptance. Thus, the present study evaluated the effect of gamma irradiation on the properties of the polished white rice starch, as well as their characteristic pulp. Doses of 6.5 kGy and 7.5 kGy did not alter the microstructure of rice starch granules, but interfered with rheological properties when compared to the control treatment, resulting in a reduction of the maximum and final viscosity and retrogradation. Since the microstructural and rheological properties within the values associated with rice quality, it was inferred that gamma irradiation did not alter the decisive characteristics for the acceptability of this cereal.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Free radical; Paste characteristics; Food irradiation.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000300006
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Oxidative stress and fish immune system: phagocytosis and leukocyte respiratory burst activity Anais da ABC (AABC)
BILLER,JAQUELINE D.; TAKAHASHI,LEONARDO S..
Abstract Molecular oxygen is a necessary compound for all aerobic organisms, although oxygen is a potent oxidant, which can cause oxidative stress (OS). OS occurs when there is an imbalance between the production of oxidant and antioxidants components, are result of normal cell metabolism, and many of these compounds play a fundamental role in several metabolic pathways. The organism produces several reactive oxygen species (ROS), but they are balanced by an antioxidant defense system that maintains the levels of these oxidizing compounds at an acceptable level. Many of these components are essential in the organism defense and their byproducts are considered potent bactericides that actively act in the destruction of invading pathogens. Fish immune system...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reactive oxygen species; Innate immunity; Antioxidant system; Free radical.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703403
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Vitamin C Deficiency Fails to Protect Mice from Malaria OAK
HERBAS, Maria Shirley; SUZUKI, Hiroshi; 鈴木, 宏志.
Nutritional deficiencies are frequent in malaria-endemic areas. It seems that micronutrient antioxidants play an important role in malaria parasite’s proliferation. Thus, the effect of vitamin C deficiency on malaria infection was examined in mice. When vitamin C deficient mice, L-gulono-γ-lactone oxidase gene knockout mice which are unable to synthesize ascorbic acid, were infected with a lethal dose of Plasmodium berghei NK65-infected red blood cells, the knockout mice showed similar parasitemia kinetics and survival rates as wild-type mice. The results indicate that deficiency of vitamin C might not affect the development of the malaria parasite in mice.
Palavras-chave: Free radical; Malaria; Vitamin C.
Ano: 2010 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3016
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