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The Impact of the Malolactic Fermentation in the Volatile Composition of Trinca...
Torres, Mª Pietra; Cabrita, M.J.; Gomes da Silva, M.D.R.; Palma, Vera; Costa Freitas, A.M.Use of commercial starters for malolactic fermentation (MLF) is a common practice, and outcomes of this procedure are very relevant for wine producers because aroma attributes might change according to the strain used. MLF was carried out in the Trincadeira wine variety in three batches: spontaneously and with inoculation of two different commercial starters. Wine extracts before and after MLF were obtained thr...
Phenolic Acids, Phenolic Aldehydes and Furanic Derivatives in Oak Chips: Americ...
Cabrita, M.J.; Barrocas Dias, C.; Costa Freitas, A.M.Phenolic acids (gallic, vanillic, syringic and ellagic acids), phenolic aldehydes (vanillin, syringaldehyde, coniferaldehyde and sinapaldehyde) and furanic derivatives (furfural, 5-methylfurfural and 5-hydroxymethylfurfural) were quantified in commercial American and French oak chips. Chips with different sizes and toast degrees were used. Compounds were extracted directly from the wood samples in order to dete...
Sensorial analysis and electronic aroma detection to compare olive oils
Vaz-Freire, L.; Cabrita, M.J.; Gomes da Silva, M.D.R.; Costa Freitas, A.M.Sensorial analysis and electronic aroma detection to compare olive oils produced by different extraction methods. A sensorial analysis and an aroma analysis by electronic sensory devices were used to compare olive oils produced according to two different extraction methods. The extraction methods compared were the press system and two phase decanter. Samples were taken from the harvests of 2002-2004 and the oli...
Qualidade dos azeites virgens com Denominação de Origem Protegida (DOP)
Simões-Lopes, P.; Gouveia, J.B.; Peres, M.F.; Gouveia, C.; Henriques, L.R.; Pinheiro-Alves, M.C.; Freitas, A.M.Artigo apresentado como comunicação no IV Simpósio Nacional de Olivicultura que decorreu em Elvas de 22 a 24 de Novembro de 2006. ; Neste trabalho apresentam-se os resultados da caracterização de azeites virgens, das campanhas de 2002/03 e 2003/04, provenientes de 19 lagares, em quatro regiões com Denominação de Origem Protegida (DOP): Moura, Norte Alentejano, Alentejo Interior e Beira Interior (Beira Baixa). ...
Effect of magnetic field on the crystallization of zinc sulfate
Freitas,A. M. B.; Landgraf,F. J. G.; Nývlt,J.; Giulietti,M.The effect of magnetic field on the crystallization of diamagnetic zinc sulfate was investigated in a series of controlled batch cooling experiments. Zinc sulfate solutions were exposed to magnetic fields of different intensities, up to a maximum of 0.7T. A clear influence of magnetic field on the following zinc sulfate crystallization parameters was found: an increase in saturation temperature, a decrease in m...
The use of mechanical aeration and its effects on water mass
SIPAÚBA-TAVARES,L. H.; FREITAS,A. M.; BRAGA,F. M. S.Due to the increasing use of artificial aerators in fish ponds, and to the lack of studies on this subject, this work studied some of the aspects associated with their use. The influence of a diffuser type aerator (AR 120) on the biotic and abiotic variables was evaluated in a fish pond. Three points of the pond were marked for the taking of samples: 5, 10 and 23 m from the aerator. Samples were taken every day...
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