16 documents found, page 1 of 2
Effect of olive pomace extract application and packaging material on the preser...
Madureira, Joana; Melgar Castañeda, Bruno; Alves, Vitor D.; Moldão-Martins, Margarida; Margaça, Fernanda M.A.; Santos-Buelga, Celestino; Barros, LillianThe efficiency of natural olive pomace extracts for enhancing the quality of fresh-cut apples was compared with commercial ascorbic acid and two different packaging films (biodegradable polylactic acid (PLA) and oriented polypropylene (OPP)) were tested. The composition of atmosphere inside the packages, the physicochemical parameters (firmness, weight loss and color), the microbial load, total phenolic content...
In-situ enzymatic conversion of sucrose into prebiotic fructooligosaccharides f...
Gonçalves, Daniela Alexandra; Alves, Vitor D.; Teixeira, J. A.; Nobre, ClarisseThe increased search for reduced-sugar and healthier food products has driven the growth of the functional food market [1]. This opened space for the development of novel functional products. Frulact SA, a partner in this project, is specialized in the development and production of fruit-based preparations, which are mainly utilized in the dairy industry for incorporation in flavored yogurts. Its market is expe...
Development of a functional prebiotic strawberry preparation by in situ enzymat...
Gonçalves, Daniela Alexandra; Alves, Vitor D.; Teixeira, J. A.; Nobre, ClarisseFood industry has been pressed to develop products with reduced sugar and low caloric value, while maintaining unchanged their rheological and physicochemical properties. The development of a strawberry preparation for the dairy industry, with prebiotic functionality, was herein investigated by in situ conversion of its intrinsic sucrose content into prebiotic fructo-oligosaccharides (FOS). Two commercial enzym...
Chitin-Glucan complex hydrogels: physical-chemical characterization, stability,...
Araújo, Diana; Rodrigues, Thomas; Roma-Rodrigues, Catarina; Alves, Vitor D.; Fernandes, Alexandra R.; Freitas, FilomenaChitin-glucan complex (CGC) hydrogels were fabricated by coagulation of the biopolymer from an aqueous alkaline solution, and their morphology, swelling behavior, mechanical, rheological, and biological properties were studied. In addition, their in vitro drug loading/release ability and permeation through mimic-skin artificial membranes (Strat-M) were assessed. The CGC hydrogels prepared from 4 and 6 wt% CGC s...
Development of a prebiotic strawberry preparation for the dairy industry
Gonçalves, D. A.; Alves, Vitor D.; Teixeira, J. A.; Nobre, ClarisseBackground. Food industry has been pressed to develop products with reduced sugar and caloric value, with the challenge of keeping rheological and sensory characteristics. Herein we developed a functional strawberry preparation for the dairy industry, by in-situ enzymatic conversion of sucrose into prebiotic fructo-oligosaccharides (FOS). Methodology. Two enzymatic complexes (Pectinex®Ultra SP-L and Viscozyme®L...
Strategies for the reduction of sugar in food products
Gomes, Ana; Bourbon, Ana I.; Peixoto, Ana Rita; Silva, Ana Sanches; Tasso, Ana; Almeida, Carina; Nobre, Clarisse; Nunes, Cláudia; Sánchez, ClaudiaOver the last years, foods are being tailored in their compositional profiles and structural properties to promote or enhance human health and well-being over and above simple nutrition. In this context, there is a need for a detailed understanding of the physical, biochemical and sensorial properties of the food categories involved since any modification targeting improved healthiness needs to guarantee their ...
Heat treatment and wounding as abiotic stresses to enhance the bioactive compos...
Santos, Diana I.; Faria, Diana L.; Lourenço, Sofia C.; Alves, Vitor D.; Saraiva, Jorge A.; Vicente, A. A.; Moldão-Martins, MargaridaAbiotic stress, like heat treatment and wounding, applied to pineapple by-products induce the accumulation of new compounds and add value. In this work the effect of the individual or combined application of wounding and heat treatment stresses on total phenolic content, antioxidant activity through complementary methods (DPPH, FRAP, and ABTS) and enzymatic activity (bromelain, phenylalanine ammonia lyase (PAL)...
Optimization of ultrasound-assisted extraction of bioactive compounds from Pelv...
Sousa, Gabriela; Trifunovska, Marija; Antunes, Madalena; Miranda, Isabel; Moldão-Martins, Margarida; Alves, Vitor D.; Vidrih, Rajko; Lopes, Paula AllenIn this study, Pelvetia canaliculata L. macroalga, collected from the Atlantic Portuguese coast, was used as a source of bioactive compounds, mostly antioxidants, to incorporate them in sunflower oil with the aim of increasing its biological value and oxidative stability. The lyophilized alga was added to the oil, and ultrasound‐assisted extraction (UAE) was performed. Algae concentration and UAE time varied fo...
Development of bioactive films based on chitosan and Cynara cardunculus leaves ...
Bras, Teresa; Rosa, Daniela; Goncalves, Ana C.; Gomes, Andreia C; Alves, Vitor D.; Crespo, Joao G.; Duarte, Maria F.; Neves, Luisa A.The development of natural based, effective and protective wound dressings associated to local treatment applied on chronic wounds, represents a major challenge nowadays. In this work chitosan-based films were prepared with different concentrations of ethanolic ultrasound assisted extracts from Cynara cardunculus leaves (EtPUAE). The physico-chemical film properties revealed that extract incorporation influence...
Antioxidants of natural plant origins: from sources to food industry applications
Lourenço, Sofia C.; Moldão, Margarida; Alves, Vitor D.In recent years, great interest has been focused on using natural antioxidants in food products, due to studies indicating possible adverse effects that may be related to the consumption of synthetic antioxidants. A variety of plant materials are known to be natural sources of antioxidants, such as herbs, spices, seeds, fruits and vegetables. The interest in these natural components is not only due to their bio...