Foram publicados os Relatórios Científicos e Técnicos nº 8 e nº 9
2015-12-03 (IPMA)
Nº 8 - Quality changes during refrigerated storage of meagre and seabream hams packaged in modified atmosphere.
Patriarca, J.; Ribeiro, A.T.; Silva, H.; Vieira, H.; Teixeira, B.; Rodrigues, M.J.; Gil, M.; Pousão, P. e Mendes, R.
Abstract
The search for healthier food products has increased the development of novel fish-based functional foods. In the present work the quality changes during refrigerated storage of meagre and sea bream hams enriched with dietetic fibers and packaged in modified atmosphere (30 % CO2 / 70 % N2) were evaluated. The fish hams had a good sensory acceptance and in microbiological terms were acceptable until at least 20 days. The consumption of 25 grams of meagre ham guarantees 6.0 % and 4.8 % of the DDR of fiber and EPA+DHA, respectively, while seabream ham provides 7.2 % and 17.7 %. The meagre and seabream hams with dietary fibers are two hypocaloric products very interesting nutritionally for a market of consumers demanding fish-based products that also promote health and well-being.
Nº 9 - Preparation of chitosan oligomers and their biological activities: A review.
Irineu Batista; Inês Andrade; Helena Alves da Silva
Abstract
Chitin and chitosan possess many functional properties offering them a wide range of applications. However, chitin is only soluble in very specific solvents whereas chitosan is soluble in diluted acid solutions, highly viscous. These problems of solubility in physiological conditions have limited their biological applications. In order to overcome these problems numerous studies have been developed on the preparation of oligomers from these biopolymers. These oligomers are water-soluble, present low viscosity and are absorbed in the human intestine. These studies concerned the development of different methods on the oligomers preparation and the evaluation of their biological activities. The current work is a review of the chemical and enzymatic methods used in the preparation of oligomers, includings the chemical hydrolysis mechanisms, and also the results obtained in the characterization of their biological activities.
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