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Xanthenedione derivatives, new promising antioxidant and acetylcholinesterase i...
Seca, Ana M. L.; Leal, Stephanie B.; Pinto, Diana C. G. A.; Barreto, Maria do Carmo; Silva, Artur M. S.Natural and synthetic xanthone derivatives are well-known for their ability to act as antioxidants and/or enzyme inhibitors. This paper aims to present a successful synthetic methodology towards xanthenedione derivatives and the study of their aromatization to xanthones. Additionally their ability to reduce Fe(III), to scavenge DPPH radicals and to inhibit AChE was evaluated. The results demonstrated that xanth...
Valuable compounds on conifers, macroalgae and halophyte species
Isca, Vera M. S.; Gouveia, Vera F.; Seca, Ana M. L.; Barreto, Maria do Carmo; Pinto, Diana C. G. A.; Silva, Artur M. S.; Kijjoa, AnakeXXIII Encontro Nacional da Sociedade Portuguesa de Química, Aveiro 12 a 14 de Junho de 2013. ; As part of our on-going investigation on bioactive secondary metabolites, we carried out the phytochemical study of the endemic conifer Juniperus brevifolia and the macroalga Cystoseira abies-marine from Azores Islands, and also of the halophyte Salicornia ramosissima from Aveiro lagoon. This communication gives an o...
Salicornia ramosissima: secondary metabolites and testicular protection induced...
Ferreira, Daniela; Isca, Vera M. S.; Seca, Ana M. L.; Pereira, M. Lourdes; Silva, Helena; Pinto, Diana C. G. A.; Silva, Artur M. S.XXIII Encontro Nacional da Sociedade Portuguesa de Química. Aveiro, 12-14 de Junho 2013. ; The structure and spectroscopic characterization of the isolated compounds from etanol and dichloromethane extracts (PUFA omega3 ethylated, sterol and a rare wax) will be presented and discussed. Concerning the effect of ethanolic extract on mice testicular tissue under carbon tetrachloride exposure, it was clearly demon...
Antioxidant activity evaluation from Artemisia gorgonum extracts
Rodrigues, Neidy; Pinto, Diana C. G. A.; Seca, Ana M. L.; Silva, Helena; Pereira, M. LourdesXXIII Encontro Nacional da Sociedade Portuguesa de Química. Aveiro, 12-14 de Junho 2013. ; Artemisia gorgonum (Asteraceae) known as “losna or lorna” is used in Cape Verde in traditional medicine to treat inflammation, fever and gastroenteritis. The antioxidant activity of methanol, 70% ethanol, chloroform-methanol and chloroform extracts from A. gorgonum leaves was evaluated using the DPPH assay and the result...
Organic compounds isolated from Juniperus brevifolia bark
Vieira, Amélia; Martins, Marcele; Seca, Ana M. L.; Pinto, Diana C. G. A.; Silva, Artur M. S.10º Encontro Nacional de Química Orgânica e 1º Simpósio Luso-Brasileiro de Química Orgânica, Lisboa, 4-6 Setembro de 2013 ; In continuation of our study on the chemical characterization of endemic plants of the Azores archipelago, we have examined Juniperus brevifolia. Our interest in this plant was stimulated by the wide range of biological activities reported for other species of this genus and/or of their c...
New syntheses of potential biologically active xanthones and benzoxanthones
Rocha, Djenisa H. A.; Leal, Stephanie B.; Seca, Ana M. L.; Pinto, Diana C. G. A.; Silva, Artur M. S.10º Encontro Nacional de Química Orgânica e 1º Simpósio Luso-Brasileiro de Química Orgânica, Lisboa, 4-6 Setembro de 2013. ; The synthesis of xanthones, adequately functionalized for a specific application, is a challenging task. In this presentation, will be disclosed our recent studies with this unique family of compounds, namely the one-pot photoinduced electrocyclisation of (E)-3-styrylflavones 1 and in si...
Synthesis of new 1,8-dihydroxy-9h-xanthen-9-ones
Leal, Stephanie B.; Seca, Ana M. L.; Pinto, Diana C. G. A.; Silva, Artur M. S.; Cavaleiro, José A. S.XXVth European Colloquium on Heterocyclic Chemistry, Reading, UK, 13 – 17 Agosto de 2012. ; Xanthones have a rather restricted occurrence among higher plants, being found almost exclusively in Guttiferae and Gentianaceae. Xanthones are sometimes found as polyhydroxylated derivatives, exhibiting valuable biological activities [1], but more often bearing a variety of substituents. Xanthones are well known for th...
Compounds identified on hexane and dichloromethane extracts of Salicornia ramos...
Isca, Vera M. S.; Seca, Ana M. L.; Pinto, Diana C. G. A.; Silva, Artur M. S.; Silva, Helena3rd Portuguese Meeting on Medicinal Chemistry and 1st Portuguese-Spanish-Brazilian Meeting on Medicinal Chemistry, Aveiro, 28-30 Novembro 2012. ; Salicornia ramosissima J. Woods (common purple glasswort) is an annual halophyte, widely distributed in the salt marsh of Ria de Aveiro (Portugal), that belongs to the Salicornia L. genus (Chenopodiaceae).[4] Although phytochemical studies genus on this genus report ...
Synthesis and antioxidant activity of new xanthone-type compounds
Leal, Stephanie B.; Pinto, Diana C. G. A.; Seca, Ana M. L.; Silva, Artur M. S.; Cavaleiro, José A. S.3rd Portuguese Meeting on Medicinal Chemistry and 1st Portuguese-Spanish-Brazilian Meeting on Medicinal Chemistry, Aveiro, 28-30 Novembro 2012. ; Owing to our continuing interest in the synthesis of novel oxygen heterocycles we have recently developed a unique synthetic procedure towards the synthesis of new xanthenodiones (2)[5] and extend the work to their aromatization into xanthones (3). Our aim was also t...
Some aromatic compounds from dichloromethane extract of Salicornia ramosissima.
Isca, Vera M. S.; Seca, Ana M. L.; Pinto, Diana C. G. A.; Silva, Artur M. S.; Silva, Helena6th Spanish-Portuguese-Japanese Organic Chemistry Symposium, Lisboa, de 18 a 20 de Julho de 2012 (Poster Communication). ; Salicornia ramosissima J. Woods, is an annual halophyte, confined to saline habitats, widely distributed in the salt marsh of Ria de Aveiro (Portugal) and also present in many salt marshes of the Iberian Peninsula. Our interest in the phytochemical study of this specie, which belongs to th...
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