Browsing by Author "Rocha, Ada"
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- How functional foods endure throughout the shelf storage? Effects of packing materials and formulation on the quality parameters and bioactivity of smoothiesPublication . Nunes, M. Antónia; Costa, Anabela S.G.; Barreira, João C.M.; Ferreira da Vinha, Ana; Alves, Rita C.; Rocha, Ada; Oliveira, M. Beatriz P.P.Smoothies are blended beverages that could contain fruit pulp, fruit juice, vegetables, yoghurt, milk, or honey. These beverages are typical examples of the food industry reply to the increase awareness of consumers for healthier foods with simple ingredients and clean labels. As emerging products, different profiling studies are needed to ensure their claimed properties. Accordingly, different physicochemical parameters, bioactive compounds, as well as the antioxidant activity, were assessed in commercial smoothies along different shelf storage periods. ANOVA, HCA and LDA statistical tools were used to allow a suitable comprehension of the obtained results. Some significant differences were found at initial time, which might be associated to smoothies’ composition. On the other hand, the physicochemical and chromatic parameters were stable during the shelf storage, while the content in bioactive compounds and the antioxidant activity indicators were significantly affected (independently of the applied thermal treatment). Nevertheless, none of the assayed formulations or packing types showed to be more susceptible to undergone specifically relevant changes during shelf storage. Overall, the results advice in favor of an earlier consumption of these products (far from the expiring date) in order to obtain the desired health effects.
- Smothies comerciais: estabilidade dos compostos antioxidantesPublication . Nunes, M. Antónia; Costa, Anabela; Barreira, João; Ferreira da Vinha, Ana; Alves, Rita C.; Rocha, Ada; Oliveira, BeatrizOs smoothies são bebidas resultantes da mistura de frutas, sumos e polpas de frutas, hortícolas, iogurte ou leite. A mais-valia associada a estes produtos é o conceito “natural” e “fresco”, sem adição de açúcares e/ou corantes, aproximando o seu conteúdo às características da fruta no seu estado natural. Neste estudo, determinou-se o teor de compostos bioativos (compostos fenólicos, flavonoides e taninos) e a capacidade antioxidante (inibição do DPPH• e poder redutor, FRAP) de smoothies disponíveis no mercado português. Para estudar as alterações ao longo do armazenamento, as amostras foram analisadas em três períodos distintos: momento da aquisição, 14 e 21 dias depois. Os resultados demonstraram, de forma inequívoca, a diminuição do teor de compostos bioativos e da capacidade antioxidante ao longo do tempo. Além do mais, este decréscimo de bioatividade ocorreu independentemente do tipo de formulação utilizada, sem que qualquer das matrizes tivesse evidenciado um efeito protetor.