Percorrer por autor "Férnandez-Ruiz, Virginia"
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- Exquisite wild mushrooms as a source of dietary fiber: analysis in electron-beam irradiated samplesPublication . Fernandes, Ângela; Barreira, João C.M.; Antonio, Amilcar L.; Morales, Patricia; Férnandez-Ruiz, Virginia; Martins, Anabela; Oliveira, Beatriz; Ferreira, Isabel C.F.R.In the present study, electron-beam irradiation was applied to dried samples of Boletus edulis and Macrolepiota procera to evaluate the effects on their fiber composition. Both species presented an important percentage of dietary fiber, soluble and insoluble in different ratios. These high fiber levels are an interesting feature, allowing considering mushrooms as an alternative source of dietary fibers in the highly competitive market of fiber-enriched food products. In B. edulis samples, insoluble fiber and total fiber amounts were significantly lower in samples irradiated with 10 kGy, but soluble fiber had no significant changes for any of the assayed doses, while total available carbohydrates were significantly lower in unirradiated samples. M. procera samples irradiated with 6 kGy presented less total fiber, insoluble fiber and carbohydrates, but the same dose allowed the highest contents in soluble dietary fiber. In general, the irradiated samples, especially for higher doses, gave some significant changes in the total available carbohydrates and dietary fibers content. Nevertheless, the resulting differences still allow considering these species as good natural fiber sources, maintaining their potential health effects, while promoting a clean way to disinfest and decontaminate these highly perishable products.
- Gamma and electron-beam irradiation as viable technologies for wild mushrooms conservation: effects on macro- and micro-elementsPublication . Fernandes, Ângela; Barreira, João C.M.; Antonio, Amilcar L.; Rafalski, Andrzej; Morales, Patricia; Férnandez-Ruiz, Virginia; Oliveira, Beatriz; Martins, Anabela; Ferreira, Isabel C.F.R.The consumption of mushrooms is increasing all over the world as a result of their sensorial and nutritional qualities. Among their nutrients, mushrooms present high levels of macro- and micro-elements. The qualitative composition in these elements is, however, often unknown. Mushrooms are known also as being very perishable products. Gamma rays or electron-beam irradiation has been applied to improve their shelf life and decrease health hazards caused by microorganisms. In addition, the effects of irradiation on the physicochemical and nutritional parameters of wild mushrooms have been studied by our research group. Nevertheless, the effects on essential macro- and micro-elements of these natural matrices are still unknown. The effects of gamma and electron-beam irradiation on the macro- and micro-elements profiles were evaluated in Boletus edulis, Hydnum repandum and Macrolepiota procera. The same elements were detected in the three species with some quantitative differences. The profiles obtained allowed the definition of proper dietary intakes, thus preventing undesirable effects derived from consuming mushrooms in quantities that exceed threshold levels of these minerals. The applied irradiation doses did not show a systematic effect on the macro- and micro-elements profiles, except for the 10 kGy. Accordingly, irradiation treatment, using gamma rays or electron beam up to 6 kGy, is a suitable technique to disinfest and/or decontaminate wild mushrooms, independently of their species or physical state.