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Protective effect of electron beam irradiation in tocopherols integrity: evaluation by HPLC-fluorescence detection

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Resumo:The high perishability is a common characteristic in mushrooms. This limitation demands for continuous investigation to achieve an effective conservation technology, allowing their preservation while simultaneously protecting the main bioactive compounds and the chemical composition in general. However, these two objectives might be more accurately achieved by combining two technologies, instead of using a single one. Therefore, electron-beam irradiation (up to 10 kGy) was applied to dried samples of Boletus edulis and Russula delica, increasing previous knowledge using gamma- and electron-beam irradiation at lower doses (up to 6 kGy) and different wild mushroom species. In this study, an HPLC system coupled to a fluorescence detector (FP-2020; Jasco), programmed for excitation at 290 nm and emission at 330 nm, was used to evaluate changes in tocopherols profile among irradiated and non-irradiated mushrooms. The chromatographic separation was achieved with a Polyamide 11 normal phase column (250 x 4.6 mm; YMC Waters) operating at 30 °C. The mobile phase used was a mixture of n-hexane and ethyl acetate (70:30, v/v) at a flow rate of 1 ml/min. The compounds were identified by chromatographic comparisons with authentic standards. Quantification was based on the fluorescence signal response, using the internal standard method. The vitamer quantified in highest amount was δ-tocopherol in both mushrooms, but B. edulis presented higher total tocopherols quantities. The effects on tocopherols profiles were significant for all quantified isoforms (except δ-tocopherol in B. edulis). Irradiated samples tended to present higher amounts, as it was particularly observed for 2 kGy dose in B. edulis (129 μg /100 g dw) and the 6 kGy in R. delica (87 μg /100 g dw), showing consistency with a previous study [1]. This result might be explained by differences in free oxygen availability inside the polyethylene bag. Overall, the applied doses might guarantee not only desinfested and decontaminated samples, but also provide the aditional advantage of protecting one of the important bioactive lipophilic compounds.
Autores principais:Fernandes, Ângela
Outros Autores:Barreira, João C.M.; Antonio, Amilcar L.; Martins, Anabela; Oliveira, Beatriz; Ferreira, Isabel C.F.R.
Ano:2013
País:Portugal
Tipo de documento:documento de conferência
Tipo de acesso:acesso aberto
Instituição associada:Instituto Politécnico de Bragança
Idioma:inglês
Origem:Biblioteca Digital do IPB

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