Browsing by Author "Coutinho, Filipe"
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- Bactericidal effect of essential oil of Angolan Cymbopogon citratus and its majority componentPublication . Soares, Marta Isabel Lopes Rodrigues de; Silva, Andreia; Coutinho, Filipe; Ferreira da Vinha, Ana; Herdeiro, Teresa; Catarino, Pedro; Gárcia Estevez, José M.; Iglesias, Raúl; Machado, MarisaCymbopogon citratus (DC) Stapf. (erva príncipe), Poaceae – Gramineae, originated in India but it is also grown elsewhere in tropical and sub‐tropical as Angola, where this is of great importance in the country's traditional medicine. Is consumed as a beverage aromatic and used in traditionalby its lemon fragrance. It is also used in traditional medicine of almost all continents and covers a wide range of such indications of disorders digestives, infectious, inflammatory, nerve, as well as other health problems. Its use in traditional medicine covers a wide range of indications by tradition, trust, and lack of economic power. The antimicrobial properties of essential oils arouse interest are an alternative to consumers in the natural additive practice as a source of food conservation.
- Caracterização físico-química, teor em ácido ascórbico e compostos fenólicos do diospyrus kaki, provenientes de diferentes regiões geográficas de Portugal continentalPublication . Calhandro, Márcio; Coutinho, Filipe; Soares, Marta O.; Ferreira da Vinha, Ana; Machado, MarisaO conhecimento da composição química dos alimentos é fundamental para a implementação de uma dieta equilibrada na população portuguesa, com impacto positivo na saúde pública. O objectivo principal desta investigação foi estudar a cultivar caqui-chocolate (Diospyrus Kaki), caracterizando-o fisico-quimicamente e no teor em compostos fenólicos na pele e polpa do fruto, mediante a área geográfica de cultivo. Dos resultados obtidos verificou-se que o teor em compostos fenólicos e actividade antioxidante dos fenóis totais variam com a presença ou ausência de pele (p<0,05) e com a região geográfica (p<0,001). De uma forma geral, os compostos fenólicos são superiores em dióspiros com pele e cultivados na região Sul de Portugal.
- Caracterização química e antioxidante do tomate português (Lycopersicon esculentum Mill.) de cultura biológica e convencional: importância dos sistemas agrícolas no seu valor nutricionalPublication . Ferreira da Vinha, Ana; Coutinho, Filipe; Soares, Marta O.; Santos, António; Almeida-Dias, A.O principal objectivo deste estudo foi o de avaliar e caracterizar o perfil químico e o teor de compostos antioxidantes do tomate português cv. Redondo, cultivado por técnicas agrícolas diferentes (biológica e convencional). Atendendo ao impacto que a dieta mediterrânica tem na saúde pública, também foi estudado, por análise sensorial, o grau de aceitação e diferenciação organoléctica do fruto, produzido em diferentes sistemas agrícolas. Os tomates foram analisados, in natura, como inteiros, sem pele e sem semente. As amostras foram avaliadas quimicamente quanto à actividade de água, humidade, sólidos solúveis totais, pH, cor, teor de ácido ascórbico, teor de fenólicos totais e de licopeno. Para a análise estatística dos resultados, utilizou-se a análise univariada (ANOVA), teste de Tukey e o de t-Stdudent, adoptando-se um nível de significância 167 de 5%. Dos resultados obtidos verificou-se que os teores de compostos fenólicos e ácido ascórbico são superiores no tomate biológico (p<0,05), não existindo significância no teor de licopeno. De uma forma geral, o tipo de preparação doméstica (inteiro, sem pele, sem semente) influencia o valor nutricional do fruto, sendo o tomate inteiro o que apresenta maior valor de compostos bioactivos (p<0,05). O tomate biológico assumiu um papel preferencial na análise sensorial, evidenciando-se a importância dos produtos biológicos na promoção da saúde pública em geral.
- Evaluation of antioxidant and antimicrobial properties of the Angolan Cymbopogon Citratus essential oil with a view to its utilization as food biopreservativePublication . Soares, Marta O.; Ferreira da Vinha, Ana; Barreira, Sérgio; Coutinho, Filipe; Aires-Gonçalves, Sérgio; Oliveira, Maria B.P.P.; Pires, Pedro C.; Castro, AnaIt was studied the chemical composition, antioxidant, antibacterial and antifungal properties of the essential oil obtained from the Cymbopogon citratus of Angolan origin. Its major constituents analyzed by GC-MS were α-citral (40.55%), β-citral (28.26%), myrcene (10.50%) and geraniol (3.37%). The essential oil antioxidant capacity was statistically identical to that of synthetic antioxidants (DPPH IC50 of 41.7 μg/ml) and superior to that of extracts obtained from fresh leaves of the plant (DPPH IC50 of 55.7 μg/ml). The oil also demonstrated to possess high antibacterial activity even against multidrug resistant strains of Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli and Klebsiella pneumoniae and antifungal activity against Candida albicans and Non-Candida albicans, Candida parapsilosis and Candida tropicalis. The results of this study, in conjunction with already published data on the properties of other Cymbopogon citratus oils, provide evidence that it could have a potential application as food preservative.
- Evaluation of physiological and microbiological tomatoes cultivars (Lycopersicon esculentum) in biotechnology sciencePublication . Ferreira da Vinha, Ana; Coutinho, Filipe; Soares, Marta Oliveira; Barros, Raquel; Iglésias, Raúl; García Estevez, JoséThe fruits present a great importance in the feeding human being and in the public health, not only for its nutritional wealth, as well as for the easy digestion, rich in minerals and vitamins levels. The tomato fruit (Lycopersicon esculentum) can be characterized as a fruit with a complex matrix where, the nutritional quality is evaluated in terms of macronutrients, vitamins and minerals. The establishment of standards of quality for foods and its degree of relative specifications to the limits of tolerance, relative to the pathogenic microorganisms, depends on the previous knowledge of the microbiotic flora and its interactions with climacteric conditions. The evaluation of the physical and chemical quality of the fruits allows establishing the quality of the fruit and its commercial standardization. The fruits, in its natural state, are susceptible to microbiologic deterioration. The natural ground, water, air and predators, are some examples of interferents with some meaning in the significant increase of the microflora of vegetables.
- Functional foods and phytotherapeutic: use as agents of plant development and prevention of public healthPublication . Silva, Viviana; Coutinho, Filipe; Oliveira, Marta Isabel; Iglésias, Raúl; García Estevez, José; Ferreira da Vinha, AnaThe current way of life may cause the increase of chronic degenerative diseases, whose treatment is not always possible with pharmacological medication. The Diet Therapy and Phytotherapy are on the rise, associated with functional foods phytotherapeutic action. The antioxidant action of bioactive compounds depends on their chemical structures and their concentrations in food. The main objective of this study was to characterize and evaluate fourteen plants of green leaf of national culture in its physical‐chemistry, levels of antioxidant compounds and synergistic effects between them, measured by the method of capture of free radical DPPH. The chemical parameters studied were water content, pH, ascorbic acid content and also total carotenoids.