Browsing by Author "Nunes, M.A."
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- Commercial smoothies containing fruit and fermented milk: stability of quality attributes during storagePublication . Nunes, M.A.; Costa, A.; Ferreira da Vinha, Ana; Alves, R.; Rocha, A.; Oliveira, M.B.P.P.There is an expanding demand of consumers for natural food products that are fresh or minimally processed and convenient. Smoothies are blended beverages containing fruits, fruit purées, pulps and/or fruit juices, yoghurt or milk that preserve the desirable characteristics of fruits. The effect of processing and storage on commercial smoothies could affect quality attributes, like color and acidity, important parameters for the consumer acceptability of the product. The aim of this work was to analyze the physical and chemical properties associated with quality attributes, in different smoothie formulations available in the Portuguese market (n=16). Samples were divided into five groups, according to composition. The total titratable acidity, pH value and soluble solid content were determined using standard methods (NP EN 12147:1999, NP EN 1132:1996 and NP EN 12143:1999, respectively). The color was measured using a colorimeter, expressed in CIE units (L*, a*, b*) and converted to hue angle (h0) and chroma (C*). Analyses were performed into three moments after purchase (0, 14 and 21 days).
- Nutritional and phytochemical properties of Opuntia ficus-indica (L.) Miller fruits from PortugalPublication . Gomes, A.; Espírito-Santo, L.; Costa, A.S.G.; Nunes, M.A.; Ferreira da Vinha, Ana; Oliveira, M.B.P.P.Opuntia ficus-indica, commonly referred to a cactus pear, belongs to the Cactaceae family, characyerized by a remarkable adaptation to arid and semi-arid climates, in tropical and subtropical regions of the globe. In Portugal, it is known as "figueira do diabo". The fruit can be used in the production of jams, in cosmetic applications and folk medicine, based on its bioactive compounds and biological/pharmacological properties.
- Opuntia ficus-indica (L.) Miller fruit from Portugal: alternative crops and food securityPublication . Gomes, A.; Espírito Santo, L.; Costa, A.S.G.; Nunes, M.A.; Ferreira da Vinha, Ana; Oliveira, M.B.P.P.The search for plant species to develop sustainable agriculture is nowadays a challenge. Opuntias (cactus), once invasive species, are now part of the natural landscape and the agricultural systems of many regions. Opuntia products (palm, flowers and fruits) are used for food, forage, energy, folk medicine, cosmetic and agronomic purposes, contributing to the food security.
- Phytochemicals in food industry by-products: the case of coffee silverskinPublication . Costa, A.; Ferreira da Vinha, Ana; Alves, R.; Nunes, M.A.; Cunha, L.M.; Oliveira, M.B.P.P.Recovery of waste and added value by-products in the food industry is mandatory in a society that aims environmental, social and economic sustainability. It promotes waste reduction and gains instead of expenses. In the present study, we used coffee silverskin, a by-product (with no added value) of coffee roast industry, as a possible source of phytochemicals with antioxidant activity. Silverskin from three commercial coffee batches (a pure robusta and two blends with arabica and robusta coffees) were provided by a local coffee torrefaction industry.