Browsing by Issue Date, starting with "2009-11"
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- 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.
- 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.
- 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.
- 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.