Encontrados 24 documentos, a visualizar página 1 de 3
Cyclic voltammetry : a tool to quantify 2,4,6-trichloroanisole in aqueous sampl...
Peres, A. M.; Freitas, P.; Dias, Luís G.; Sousa, Mara E. B. C.; Castro, L. M.; Veloso, Ana C. A.Chloroanisoles, namely 2,4,6-trichloroanisole, are pointed out as the primary responsible of the development of musty off-flavours in bottled wine, due to their migration from cork stoppers, which results in huge economical losses for wine industry. A prevention step is the detection of these compounds in cork planks before stoppers are produced. Mass spectrometry gas chromatography is the reference method used...
Carbon footprint of apple and pear : orchards, storage and distribution
Figueiredo, F.; Castanheira, E.G.; Feliciano, M.; Rodrigues, M.A.; Peres, A.; Maia, F.; Ramos, A.; Carneiro, J.P.; Coroama, V.C.; Freire, F.Apple and pear represent 51% of fresh fruit orchards in Portugal. This paper presents a life-cycle (LC) greenhouse gas (GHG) assessment (so-called carbon footprint) of 3 apple and 1 pear Portuguese production systems. An LC model and inventory were implemented, encompassing the farm stage (cultivation of fruit trees in orchards), storage and distribution (transport to retail). The functional unit considered in ...
Determination of 2,4,6-trichloroanisole by cyclic voltammetry
Freitas, P.; Dias, Luís G.; Peres, A. M.; Castro, L. M.; Veloso, Ana C. A.The electrochemical reduction of 2,4,6-trichloroanisole (TCA), a chlorinated arene with electron-donating substituents, was evaluated by cyclic voltammetry (CV). TCA is a major concern for the winery industry since it is related with “cork taint”, a wine defect. The results obtained showed that CV could be used to detect and quantify TCA in standard solutions. Linear relationships could be set between the curre...
New improved method for fructooligosaccharides production by Aureobasidium pull...
Dominguez, Ana; Nobre, C.; Rodrigues, L. R.; Peres, A. M.; Torres, D.; Rocha, I.; Lima, Nelson; Teixeira, J. A.Fructooligosaccharides are prebiotics with numerous health benefits within which the improvement of gut microbiota balance can be highlighted, playing a key role in individual health. In this study, an integrated one-stage method for FOS production via sucrose fermentation by Aureobasidium pullulans was developed and optimized using experimental design tools. Optimization of temperature and agitation speed for ...
Maximization of fructose esters synthesis by response surface methodology
Neta, Nair S; Peres, A. M.; Teixeira, J. A.; Rodrigues, L. R.Enzymatic synthesis of fructose fatty acide sterwasper formed inorganic solventmedia, using apurified lipase from Candida antartica B immobilizedinacrylicresin. Response sur face methodology with a central composit erotatable design based on five levels was implemented to optimize three experimental operating conditions (temperature, agitation and reaction time). A statistical significant cubic model was establ...
Effect of guar gum on the physicochemical, thermal, rheological and textural pr...
Oliveira, N. M.; Dourado, Fernando; Peres, A. M.; Silva, M. V.; Maia, J. M.; Teixeira, J. A.In attempts to produce a low-fat cheese with a rheology and texture similar to that of a full-fat cheese, guar gum (within 0.0025–0.01%; w/v, final concentration) was added to low-fat milk. The obtained cheeses were characterised regarding their physicochemical, thermal, rheological and textural properties. Control cheeses were also produced with low and full-fat milk. The physicochemical properties of the guar...
Infective endarteritis complicating clinically silent patent ductus arteriosus
Ferreira, PS; Rodrigues, P; Peres, A; Roque do Vale, P; Casimiro, A; Cunha, FInfective Endocarditis is caused by bacteria or fungi involving the heart or the great vessels (Endarteritis). It is a rare and potentially ominous disease, with increasing incidence. Despite technological advances it remains difficult to diagnose and treat, particularly in children below two years. Congenital heart disease is the main risk factor for Infective Endocarditis in children. A patent ductus arterios...
Coarctação Isolada da Aorta: Experiência em 100 Doentes Consecutivos
Peres, A; Martins, JD; Paramés, F; Gil, R; Matias, C; Franco, J; Freitas, I; Trigo, C; Fragata, J; Pinto, MFINTRODUCTION: Coarctation of the aorta (CoA) is a stenosis usually located in the descending aorta. Treatment consists of surgical or percutaneous removal of the obstruction and presents excellent immediate results but significant residual problems often persist. OBJECTIVES: To describe the presentation, treatment and long-term evolution of a population of 100 unselected consecutive patients with isolated CoA ...
Application of an electronic tongue to detect gliadins in gluten-free foods
Peres, A. M.; Dias, Luís G.; Veloso, Ana C. A.; Meirinho, S. G.; Morais, J. Sá; Machado, A. A. S. C.Celiac disease is an autoimmune-mediated disorder triggered in genetically susceptible individuals by the ingestion of some gluten proteins, namely gliadins. To prevent inadvertent gluten consumption, the Commission Regulation (EC) Nº41/2009 will implement labelling foods as “gluten-free” or “low-gluten content”[1]. The feasibility of an all-solid-state potentiometric electronic tongue to detect the contaminati...
Comparison of adsorption equilibrium of fructose, glucose and sucrose on potass...
Nobre, C.; Santos, Maria João; Dominguez, Ana; Torres, D.; Rocha, Orlando; Peres, A. M.; Rocha, I.; Ferreira, E. C.; Teixeira, J. A.; Rodrigues, L. R.Adsorption equilibrium of fructose, glucose and sucrose was evaluated on sulfonated poly(styrene-co-divinylbenzene) cation-exchange resins. Two types of resins were used: potassium (K+) gel-type and sodium (Na+) macroporous resins. Influence of the cation and effect of the resin structure on adsorption were studied. The adsorption isotherms were determined by the static method in batch mode for mono-component a...
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