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A PORTUGUESE SURVEY ABOUT THE KNOWLEDGE AND ATTITUDES OF THE POPULATION REGARDI...
Barroca, Maria João; Martinho, Célia; Guiné, RaquelDietary fibres assume an important role on today’s diet, and the consumption of dietary fibre in food such as fruits, vegetables, whole grains, and legumes is critical for fighting the epidemic of obesity in developed countries. Given this importance, the knowledge, attitudes and perceptions of the Portuguese regarding dietary fibre were investigated by undertaking a consumer survey by means of questionnaire. ...
Influence of pre drying treatment on physical properties of carrots
Barroca, Maria João; Sério, Susana; Guiné, Raquel; Correia, PaulaIn the present work, the effect of pre-treatment of ascorbic acid on color changes and texture was investigated during convective hot air drying at 60ºC. The pre-treatments were done at 0.25 % and 1 % of ascorbic acid with treatment times of 60 and 90 minutes. Changes in color and total color difference were evaluated by the CIELab color system and texture of dried carrots was accessed in terms of hardness, sp...
Influence of pre-treatment on some physical-chemical properties of dried carrots
Guiné, Raquel; Sério, Susana; Correia, Paula; Barroca, Maria JoãoIntroduction: Carrot is the most commonly used vegetable for human nutrition and is an excellent source of β-carotene, vitamin A and potassium, and contains cholesterol-lowering pectin, vitamin C, vitamin B6, thiamine, folic acid, and magnesium. Carrots are highly seasonal and abundantly available at particular times of the year. For extending the availability of this root, several preservation processes can be...
Aplicação da modelização por redes neuronais ao teor de compostos fenólicos e a...
Guiné, Raquel; Barroca, Maria João; Gonçalves, Fernando; Alves, Mariana; Oliveira, Solange; Mendes, MateusOs compostos fenólicos estão amplamente presentes no reino vegetal, sendo essenciais para o crescimento e reprodução das plantas, além de serem responsáveis pela cor, adstringência e aroma em vários alimentos [1]. Estes compostos, sendo antioxidantes, combatem os radicais livres, previnem doenças cardíacas, doenças neurodegenerativas, problemas do aparelho circulatório, cancro, inflamação e inibem a oxidação li...
Effect of pre-treatment on some physical-chemical properties of dried carrots
Guiné, Raquel; Sério, Susana; Correia, Paula; Barroca, Maria JoãoCarrot is the most commonly used vegetable for hu- man nutrition and is an excellent source of β-carotene, vitamin A and potassium, and contains cholester- ol-lowering pectin, vitamin C, vitamin B6, thiamine, folic acid, and magnesium. Carrots are highly season- al and abundantly available at particular times of the year. For extending the availability of this root, several preservation ...
Evaluation of total phenolic compounds and antioxidant activity for the drying ...
Guiné, Raquel; Gonçalves, Fernando; Alves, Mariana; Oliveira, Solange; Barroca, Maria João; Correia, PaulaChemically, the phenolic compounds are cyclic benzene compounds having one or more hydroxyl groups directly associated to the ring structure. While they contain alcohol groups, they do not show properties of alcohols. The phenols can be distinguished into two groups: non-flavonoids and flavonoids [1-4]. Bananas cv. nana and pears cv. D. Joaquina were subject to drying (at 70 ºC) for comparison of their propert...
Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying o...
Guiné, Raquel; Barroca, Maria JoãoPortugal is a tropical country with a long tradition of drying fruits, among which stand the pears. The design of the proper operating conditions relies on the knowledge of the transfer phenomena happening during drying. Hence, the present work aimed at determining the mass transfer properties of pears for convective air drying, based on the diffusion model. The values of the diffusion and mass transfer coeffi...
Drying Kinetics of Banana Slices (cvs. Musa nana and Musa Cavendish)
Guiné, Raquel; Barroca, Maria JoãoIn the present work, bananas of cvs. Musa nana and Musa Cavendish were dehydrated by hot air drying at 50 ºC and 70 ºC. The purpose of this work was to fit the kinetic data to different thin layer models found in the literature to describe the drying rates of bananas, in order to find out which model better describes the drying kinetics of these two varieties of bananas. The selection of the appropriate drying...
Effect of drying on the properties of pears cv. D. Joaquina
Barroca, Maria João; Guiné, Raquel; Alves, Mariana; Oliveira, Solange; Gonçalves, Fernando; Correia, PaulaIn the present work, pears of the Portuguese cultivar, cv. D. Joaquina, were dehydrated by hot air drying at temperatures of 60 ºC and 70 ºC. Drying properties such as moisture, color, antioxidant activity, and total phenols content were evaluated. The drying temperature induced the increase of a* and b* colorimetric parameters, due to non-enzimatic browning r...
Efeito da secagem nos teores de compostos fenólicos e da atividade antioxidante...
Guiné, Raquel; Barroca, Maria JoãoBananas e plátanos são hoje cultivadas em todas as regiões tropicais húmidas e constituem o quarto fruto mais cultivado do mundo. A casca da fruta varia de verde profundo a amarelo ou vermelho, enquanto que a polpa varia de branco-marfim para amarelo ou salmão-amarelo. A polpa pode ser firme, adstringente e pegajosa, quando verde, tornando-se escorregadia quando madura. O sabor pode ser le...
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