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Effects of gamma irradiation on chemical composition and antioxidant potential ...
Ferrreira, Ângela; Barreira, João C.M.; Antonio, Amilcar L.; Oliveira, M.B.P.P.; Martins, Anabela; Ferreira, Isabel C.F.R.It was previously demonstrated that gamma irradiation was the processing technology with the highest capacity to maintain the chemical profile of fresh Macrolepiota procera wild mushroom, when compared to freeze-dried or oven-dried samples. Herein, it was aimed to evaluate gamma irradiation effects on processed samples. Chemical composition and antioxidant potential of irradiated (0.5 and 1 kGy) fresh, frozen a...
Development of a novel methodology for the analysis of ergosterol in mushrooms
Barreira, João C.M.; Oliveira, M.B.P.P.; Ferreira, Isabel C.F.R.Sterols are important molecules in the unsaponifiable fraction of several matrices. Ergosterol, which is an important vitamin D2 precursor, is clearly the main sterol in mushrooms. Herein, an analytical method for ergosterol determination in cultivated and wild mushrooms was developed using high-performance liquid chromatography coupled to ultraviolet detection. The chromatographic separation was achieved in an...
Nutritional composition, antioxidant activity and phenolic compounds of wild Ta...
Dias, Maria Inês; Barros, Lillian; Alves, Rita C.; Oliveira, M.B.P.P.; Santos-Buelga, Celestino; Ferreira, Isabel C.F.R.Flowers and vegetative parts of wild Taraxacum identified as belonging to sect. Ruderalia were chemically characterized in nutritional composition, sugars, organic acids, fatty acids and tocopherols. Furthermore, the antioxidant potential and phenolic profiles were evaluated in the methanolic extracts, infusions and decoctions. The flowers gave higher content of sugars, tocopherols and flavonoids (mainly luteol...
Nutritional and antioxidant contributions of Laurus nobilis L. leaves: would b...
Dias, Maria Inês; Barros, Lillian; Dueñas, Montserrat; Alves, Rita C.; Oliveira, M.B.P.P.; Santos-Buelga, Celestino; Ferreira, Isabel C.F.R.Medicinal and aromatic plants are used since ancient times in folk medicine and traditional food, but also in novel pharmaceutical preparations. The controversy lies in the use of cultivated and/or wild plants presenting both advantages and disadvantages in biological, ecological but also economic terms. Herein, cultivated and wild samples of Laurus nobilis L. were chemically characterized regarding nutritional...
Feasibility of electron-beam irradiation to preserve wild dried mushrooms: effe...
Fernandes, Ângela; Barreira, João C.M.; Antonio, Amilcar L.; Oliveira, M.B.P.P.; Martins, Anabela; Ferreira, Isabel C.F.R.Mushrooms are highly perishable matrices and to extend time of consumption they need to be preserved. Since all the available conservation technologies present disadvantages, the combination of two different processes might minimize some of the limitations. Therefore, in the present work, electron-beam irradiation (up to 10 kGy) was applied to dried samples of Boletus edulis and Russula delica, extending previo...
Triacylglycerols profiling as a chemical tool to identify mushrooms submitted t...
Fernandes, Ângela; Barreira, João C.M.; Antonio, Amilcar L.; Martins, Anabela; Ferrreira, Isabel C.F.R.; Oliveira, M.B.P.P.In order to define irradiation treatment as a routine conservation methodology, it is imperative to develop chemometric indicators with the ability to distinguish irradiated from unirradiated foodstuffs. Electron spin resonance, photostimulated luminescence and thermoluminescence methods were employed to monitor radiation-induced markers, as well as different chemical compounds produced from the lipidic fractio...
Two-dimensional PCA highlights the differentiated antitumor and antimicrobial a...
Dias, Maria Inês; Barreira, João C.M.; Calhelha, Ricardo C.; Queiroz, Maria João R.P.; Oliveira, M.B.P.P.; Soković, Marina; Ferreira, Isabel C.F.R.Natural matrices are important sources of new antitumor and antimicrobial compounds. Species such as Laurus nobilis L. (laurel) might be used for this purpose, considering its medicinal properties. Herein, in vitro activity against human tumor cell lines, bacteria, and fungi was evaluated in enriched phenolic extracts. Specifically, methanol and aqueous extracts of wild and cultivated samples of L. nobilis were...
Insights on the formulation of herbal beverages with medicinal claims according...
Barreira, João C.M.; Morais, Ana L.; Ferreira, Isabel C.F.R.; Oliveira, M.B.P.P.Several herbal beverages claim medicinal benefits due to their antioxidant properties. However, operational factors such as the extracted herbal component, preparation method or concentration levels, might influence their biological activity. To assess this effect, the antioxidant activity of beverages prepared with Camellia sinensis, Aspalathus linearis or Cochlospermum angolensis, used solely or mixed with di...
Effects of gamma and electron beam irradiations on the triacylglycerol profile ...
Barreira, João C.M.; Carocho, Márcio; Ferreira, Isabel C.F.R.; Antonio, Amilcar L.; Kałuska, Iwona; Botelho, M. Luísa; Bento, Albino; Oliveira, M.B.P.P.The present chestnut (Castanea sativa Miller) commercialization dynamics, including distribution to novel markets, demands suitable conservation technologies. Irradiation has been considered a promising alternative to chemical fumigation (legally forbidden and harmful for human health and environment) or heat treatments (technological difficulties and low efficiency). Following previous studies on the effects o...
Study of chemical changes and antioxidant activity variation induced by gamma-i...
Fernandes, Ângela; Barreira, João C.M.; Antonio, Amilcar L.; Santos, Pedro M.P.; Martins, Anabela; Oliveira, M.B.P.P.; Ferreira, Isabel C.F.R.Mushrooms are especially sensitive to senescence, browning, water loss and microbial attack. Furthermore, wild species are characterized for their seasonality, demanding the development of suitable preservation technology. Gamma-irradiation was previously tested in wild Lactarius deliciosus, being verified that its application up to 1 kGy did not imply significant changes in chemical parameters. Herein, the eff...
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