O ambiente marinho constitui uma extraordinária reserva de compostos com caracterÃsticas estruturais únicas, diferentes das encontradas nos Produtos Naturais de origem terrestre. Os compostos de origem marinha assumem assim um papel cada vez mais significativo na descoberta de novos medicamentos, de novas aplicações em cosmética, na produção de enzimas com caracterÃsticas especÃficas ou como biomateri...
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...
Copyright: © 2013 Silva M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credite. ; The green macroalga Ulva rigida C. Agardh (Chlorophyta) and the red macroalga Gelidium microdon Kützing (Rhodophyta), collected from the Azore...
A secção UAciência é coordenada pelo Professor Universitário Armindo Rodrigues. ; "[…]. A procura de medicamentos fitoquímicos (compostos químicos produzidos pelas plantas que possam ser usados como medicamentos) continua, e consequentemente, mais plantas são alvo de estudos, chamados estudos fitoquímicos, com o objectivo de se conhecer os seus constituintes químicos e, principalmente, descobrir novas molécula...
XXIII 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...
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...
XXIII Encontro Nacional da Sociedade Portuguesa de Química. Aveiro, 12-14 de Junho 2013. ; The cytotoxic, antibacterial, antioxidant and anticholinesterasic (anti-AChE) activities of the methanol and acetone extracts of Juniperus brevifolia wood and bark were determined. The present study demonstrates that bark extracts of J. brevifolia are the most active and showed good antioxidant activity, lower anti-AChE ...
XXIII 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...
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...
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...
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