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Influence of electrospinning parameters on Poly(hydroxybutyrate) electrospun me...

Poly(hydroxybutyrate) (PHB) obtained from sugar cane was dissolved in a blend of chloroform and dimethylformamide (DMF) and electrospun at 40 ºC. By adding DMF to the solution, the electrospinning process for the PHB polymer becomes more stable, allowing complete polymer crystallization during the jet travelling between the tip and the grounded collector. The influence of processing parameters on fiber size and...

Processing and characterization of alpha-elastin electrospun membranes

Elastin isolated from fresh bovine ligaments was dissolved in a mixture of 1,1,1,3,3,3-Hexafluoro-2-propanol and water and electrospun into fiber membranes under different processing conditions. Fiber mats of randomly and aligned fibers were obtained with fixed and rotating ground collectors and fibrils were composed by thin ribbons whose width depends on electrospinning conditions; fibrils with 721 nm up to 2....

Comparison of H. pylori in silico metabolic model predictions with experimental...

UV spectrophotometry method for the monitoring of galacto-oligosaccharides prod...

Monitoring the industrial production of galacto-oligosaccharides (GOS) requires a fast and accurate methodology able to quantify, in real time, the substrate level and the product yield. In this work, a simple, fast and inexpensive UV spectrophotometric method, together with partial least squares regression (PLS) and artificial neural networks (ANN), was applied to simultaneously estimate the products (GOS) and...

UV spectrophotometry method for the monitoring of galacto-oligosaccharides prod...

Monitoring the industrial production of galacto-oligosaccharides (GOS) requires a fast and accurate methodology able to quantify, in real time, the substrate level and the product yield. In this work, a simple, fast and inexpensive UV spectrophotometric method, together with partial least squares regression (PLS) and artificial neural networks (ANN), was applied to simultaneously estimate the products (GOS) and...

Optimization of the determination of tocopherols in Agaricus sp. edible mushroo...

Individual tocopherol profile of five Agaricus mushroom species, widely consumed in Portugal, was obtained by a normal-phase high-performance liquid chromatography (NP-HPLC). It was used a simple solid–liquid extraction procedure without saponification step and the chromatographic separation was achieved using a YMC-Pack Polyamine II column using an isocratic elution with hexane/ethyl acetate (70:30, v/v) at a ...

Raw bovine meat fatty acids profile as an origin discriminator

Consumers are very concerned in ‘‘Protected Designation of Origin” (PDO) products, namely meat, since they associate these prod- ucts to quality and healthy foods. Thus, it is necessary to implement analytical methodologies that could assure consumers about the products they purchase. Since this kind of meat is usually sold with no information concerning cattle sex, age and slaughter season, these characteri...

Análise de sulfonamidas no mel: validação e optimização de um método de HPLC-fl...

Os antibióticos são usados no tratamento de abelhas com o intuito de combater infecções associadas às doenças da Loque Americana e Loque Europeia que atacam as larvas das abelhas levando à destruição da colmeia. As sulfonamidas são um dos grupos de antibióticos mais usados pelos apicultores. Como a Legislação Europeia, proíbe a comercialização do mel na presença de quaisquer resíduos de antibióticos, a implemen...

Chemical composition and antioxidant activity of frozen, dried and cooked wild ...

Fatty acid and sugar compositions, and nutritional value of five wild edible mu...

The chemical composition and nutritional value of five wild edible mushroom species (Agaricus arvensis, Lactarius deliciosus, Leucopaxillus giganteus, Sarcodon imbricatus, Tricholoma portentosum) commonly consumed in the Tra´s-os-Montes region of Northeast Portugal was determined. Chemical composition evaluation included moisture, total oil content, crude protein, ash, carbohydrates, and nutritional value deter...