Effect of solvent and extraction temperatures on the antioxidant potential of traditional stoned table olives “alcaparras”

Sousa, Anabela; Ferreira, Isabel C.F.R.; Barros, Lillian; Bento, Albino; Pereira, José Alberto

doi:10.1016/j.lwt.2007.04.003

Cited by 87 publications

(49 citation statements)

References 36 publications

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“…In previous works Sousa, Ferreira, Barros, Bento, & Pereira, in press), we observed a significantly negative linear correlation between the polyphenol contents and EC 50 antioxidant activity values. This negative linear correlation proves that the samples with highest polyphenol contents show lower EC 50 values, confirming that phenolics are likely to contribute to the antioxidant activity of the extracts, as has been reported in other species (Velioglu, Mazza, Gao, & Oomah, 1998).…”

Section: Resultssupporting

confidence: 47%

Antioxidant activities of the extracts from chestnut flower, leaf, skins and fruit

et al. 2008

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In this study, the antioxidant properties of chestnut (flowers, leaves, skins and fruits) extracts were evaluated through several biochemical assays: DPPH (2,2-diphenyl-1-picrylhydrazyl) radical-scavenging activity, reducing power, inhibition of b-carotene bleaching, inhibition of oxidative hemolysis in erythrocytes, induced by 2,2 0 -azobis(2-amidinopropane)dihydrochloride (AAPH), and inhibition of lipid peroxidation in pig brain tissue through the formation of thiobarbituric acid-reactive substances (TBARS). These assays have been extensively studied as models for the peroxidative damage in biomembranes. The EC 50 values were calculated for all the methods in order to evaluate the antioxidant efficiency of each chestnut extract. The phenol and flavonoid contents were also obtained. Chestnut skins revealed the best antioxidant properties, presenting much lower EC 50 values, particularly for lipid peroxidation inhibition in the TBARS assay. Furthermore, the highest antioxidant contents (polyphenols and flavonoids) were found for these extracts.

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Section: Resultssupporting

confidence: 47%

Antioxidant activities of the extracts from chestnut flower, leaf, skins and fruit

et al. 2008

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“…in the present study, compared to the 40˚C extraction procedure, the 100˚C extraction process was more effective at extracting polysaccharides and polyphenols to obtain a higher antioxidant content. this finding is similar to that in the study of Sousa et al (21). the four extracts, WE-Ep and WE-ES produced using 100˚C and 40˚C extraction procedures, were used for evaluating the anti-proliferative effect on dld-1 cells.…”

Section: Discussionsupporting

confidence: 85%

Antioxidant and antitumor activities of water extracts from the root of Actinidia kolomikta

Guan

Zhang

Yang

et al. 2010

Experimental and Therapeutic Medicine

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Abstract. the genus of Actinidia is widely distributed throughout the Asian continent. Specific Actinidia species have been used as health foods and medical products for cancer treatment. Actinidia kolomikta is a species of wild plant that grows in the northern part of indochina. however, few studies on its bioactivity have been reported. in this study, the polysaccharide and polyphenol contents, the SOd-like activity and the dpph radical-scavenging activity of water extracts from the root of Actinidia kolomikta produced under different extraction temperatures were investigated. Furthermore, the water extraction-ethanol precipitate (WE-Ep) fraction and the water extraction-ethanol supernatant (WE-ES) fraction were used to test the anti-proliferative action on dld-1 colon cancer cells. Extracts produced using the 100˚C extraction procedure revealed higher extraction yields and antioxidant activities than extracts produced using the 40˚C extraction procedure. the WE-Ep and WE-ES fractions exhibited anti-proliferative effects on the dld-1 cells. moreover, the WE-ES polyphenolenriched fraction possessed more potent anti-proliferative effects on the dld-1 cells by inducing apoptosis compared to the WE-Ep polysaccharide fraction. medicinal plant extracts are generally considered to be relatively non-toxic at low doses and are not thought to cause major side effects compared to those observed with drugs. Wild A. kolomikta may provide an alternative to currently employed cancer therapies, and may be used as a natural health food with antioxidant actions.

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“…[40][41][42] Tal correlação pôde ser observada nos resultados obtidos dos ensaios de fenólicos totais e dos testes antioxidantes dos extratos em metanol e em etanol da própolis. Pela análise de CCD comparativa percebeu-se que os mesmos componentes extraídos em metanol também são encontrados quando extraídos em etanol, garantindo que o extrato de própolis comercial é eficiente.…”

Section: Conclusãounclassified

Constituintes fenólicos e atividade antioxidante da geoprópolis de duas espécies de abelhas sem ferrão amazônicas

Silva¹,

Muniz²,

Nunomura³

et al. 2013

Quím. Nova

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Recebido em 13/6/12; aceito em 4/12/12; publicado na web em 12/3/13 PHENOLIC CONSTITUENTS AND ANTIOXIDANT ACTIVITY OF GEOPROPOLIS FROM TWO SPECIES OF AMAZONIAN STINGLESS BEES. We investigated the phenolic constituents and antioxidant activity of geopropolis from two species of stingless Amazonian bees, Melipona interrupta and Melipona seminigra. The chemical investigation of geopropolis from Melipona interrupta led to the isolation of 5,7,4'-trihydroxyflavonone, 3,5,6,7,4'-pentahydroxyflavonol, naringenine-4'-O-β-D-glucopyranoside and myricetin-3-O-β-D-glucopyranoside. Their structures were assigned based on spectroscopic analyses, including two-dimensional NMR techniques. Antioxidant activity of methanol and ethanol extracts of M. interrupta and M. seminigra were measured using the 1,2-diphenyl-2-picryl-hydrazyl (DPPH) free radical scavenging assay. This is also the first work reporting the chemical investigation of stingless bee species from the Amazonian region.Keywords: flavonoides; geopropolis; Melipona. INTRODUÇÃOA geoprópolis é um produto resinoso produzido pelas abelhas, inclusive pelas espécies Melipona interrupta e Melipona seminigra, a partir da coleta de resinas vegetais, óleos essenciais, pólen, cera e açúcares, que é utilizado na construção e calafetação da colmeia. 1,2Tem cor variada de verde, vermelho para marrom escuro, apresenta um aroma característico e propriedades adesivas, porque interage fortemente com óleos e proteínas da pele. 3Tem sido utilizada na medicina popular há milhares de anos, devido às propriedades biológicas que a própolis tem, tais como, anti-inflamatória, antibacteriana, 4,5 antifúngica, 6 antioxidante, [7][8][9] hepato-protetora, antiviral, capacidade de aumentar a resistência natural do corpo a infecções e tratar úlcera gastroduodenal. 10 Vários estudos registraram que a atividade biológica da própolis depende da composição química, a qual também depende da diversidade geográfica e da variedade genética da rainha. 11Como a própolis apresenta várias atividades biológicas, em sua composição química constam muitos produtos naturais bioativos como polifenóis, flavonoides e ésteres do ácido cafeico. 12,13 É extremamente difícil identificar qual a substância responsável por sua atividade terapêutica, uma vez que existe uma diversidade muito grande de componentes presentes na própolis. Alguns autores afirmam que sua eficácia estaria justamente na composição química heterogênea.14 Entre os grupos biologicamente ativos mais importantes descritos na própolis, estão os compostos fenólicos, onde podemos destacar os ácidos gálico, vanílico, ferúlico, p--cumárico, éster fenetílico do ácido cafeico (CAPE), ácidos cafeico e siringíco, que são comuns em produtos apícolas. 15 Outro grupo de compostos fenólicos encontrado na própolis são os flavonoides. Dentre eles podemos destacar alguns flavonóis: galangina, campeferol, quercetina, miricetina, algumas flavonas: crisina, apigenina, luteolina, tectocrisina, e as flavanonas: pinocembrina, isosacuranetina, naringenina. 10A composição química ...

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Effect of solvent and extraction temperatures on the antioxidant potential of traditional stoned table olives “alcaparras”

Cited by 87 publications

References 36 publications

Antioxidant activities of the extracts from chestnut flower, leaf, skins and fruit

Antioxidant activities of the extracts from chestnut flower, leaf, skins and fruit

Antioxidant and antitumor activities of water extracts from the root of Actinidia kolomikta

Constituintes fenólicos e atividade antioxidante da geoprópolis de duas espécies de abelhas sem ferrão amazônicas

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