Browsing by Author "Oliveira, Andreia P."
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Estudo preliminar da actividade antimicrobiana das folhas de cydonia oblonga millerPublication . Filipe, Catarina; Silva, Ricardo; Miranda, Ana; Oliveira, Andreia P.; Silva, Branca M.; Sousa, João Carlos; Cerqueira, FátimaO marmelo é reconhecido como uma importante fonte de compostos promotores da saúde sendo que a actividade antimicrobiana dos extractos da sua polpa, casca e sementes foi já avaliada. Não existem porém estudos da actividade antimicrobiana das folhas de marmeleiro. Este estudo preliminar teve como objectivo determinar a actividade dos seus extractos metanólicos. Concluiu-se que os extractos testados não apresentam actividade em E. coli, S. aureus, C. albicans, C. glabrata, A. niger, A. fumigatus, Mucor spp e Absídia spp pelo que novos extractos devem ser preparados sendo posteriormente avaliados. Quince fruit is recognized an important source of health promoting compounds being the antimicrobial activities of the quince pulp, peel grape and seed extracts already evaluated. No results are known for quince leaves antimicrobial activity. This preliminary work intended to determine the activity of quince leaves methanolic extracts. These had no antimicrobial activity either against E. coli, S. aureus, C. albicans, C. glabrata, A. niger, A. fumigatus, Mucor spp e Absídia spp and new extracts must be prepared and evaluated.
- O perfil fenólico como parâmetro de autenticidade de derivados de marmeloPublication . Silva, Branca M.; Oliveira, Andreia P.Frequentemente, a indústria dos derivados de marmelo usa outros frutos na confecção dos mesmos. A pêra e a maçã são as mais utilizadas para o efeito, por serem facilmente acessíveis, de baixo custo e terem uma textura semelhante à do marmelo. Também é comum a utilização de frutos por descascar na produção de marmeladas, embora tal não seja permitido pela legislação Portuguesa. Pretende-se demonstrar a utilidade da determinação do perfil fenólico na avaliação da autenticidade de derivados do marmelo. Frequently, quince products industry uses other fruits in its manufacture. Pear and apple seem to be the most used for this effect, once they are easily accessible, of low cost and have a similar texture of quince. Unpeeled fruits utilization is also very usual in the production of quince jams, although not allowed by Portuguese legislation. In this revision paper, we intend to demonstrate the great utility of phenolic profile determination in the evaluation of quince derivatives authenticity.
- Targeted metabolites and biological activities of Cydonia oblonga Miller leavesPublication . Oliveira, Andreia P.; Costa, Rossana M.; Magalhães, Ana S.; Pereira, José A.; Carvalho, Márcia; Valentão, Patrícia; Andrade, Paula B.; Silva, Branca M.Natural products continue to play a significant role in drug discovery and development processes, and many plants have already provided valuable clues for potentially bioactive compounds. Additionally, in recent years it has become evident that significant health risks and benefits are associated with dietary food choice. Nutritional studies recommend the regular consumption of fruits and vegetables, which constitute an essential part of the Mediterranean diet, to favor a healthy life. Several works have showed that quince tree (Cydonia oblonga Miller) is a good and low cost natural source of metabolites with interesting biological properties. Extensive research has been performed on the metabolic profile and biological potential of this species. In particular, quince leaves revealed to constitute a promising natural source of bioactive phytochemicals, suitable for application in nutritional/pharmaceutical fields. In this review phenolics and organic acids composition of quince leaf is overviewed, as well as its antioxidant and antiproliferative properties, in chemical and cellular in vitro systems. Comparisons with green tea, considered by the scientific community as an effective natural antioxidant, were established.