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|Título:||How does irradiation affect bioactive compounds of watercress?|
Barreira, João C.M.
Cabo Verde, Sandra
Antonio, Amilcar L.
Carvalho, Ana Maria
Ferreira, Isabel C.F.R.
|Citação:||Pinela, José; Barros, Lillian; Barreira, João C.M.; Cabo Verde, Sandra; Antonio, Amilcar L.; Carvalho, Ana Maria; Oliveira, M.B.P.P.; Santos-Buelga, Celestino; Ferreira, Isabel C.F.R. (2018) - How does irradiation affect bioactive compounds of watercress? In ISEAC‐40 International Conference on Environmental & Food Monitoring. Santiago de Compostela. ISBN 978‐84‐09‐03799‐5|
|Resumo:||Ready-to-eat vegetables have become more popular in consumers’ market baskets due to their convenience and health benefits . The growth of this sector has promoted the introduction of new foods and the adoption of more efficient and eco-friendly postharvest technologies such as irradiation. However, a common consumer concern is whether irradiation adversely affects the nutritional value of food. In this sense, the suitability of post-packaging irradiation for preserving bioactive compounds of watercress (Nasturtium officinale R. Br.) during cold storage was evaluated. Watercress samples gathered in the Northeastern region of Portugal were hand-picked and rinsed in tap water. A portion was immediately analyzed (fresh control) and the remaining fresh material was packaged in polyethylene bags, irradiated at doses up to 5 kGy in a Co-60 experimental chamber, and stored at 4 ºC for 7 d. A non-irradiated control followed the experiment. Tocopherols and phenolic compounds were analyzed by chromatographic techniques and the antioxidant activity was evaluated using four in vitro assays [2,3]. In general, flavonoids predominated over phenolic acids. The 5 kGy dose preserved the amounts of total phenolic acids and phenolic compounds and increased the levels of p-coumaric acid (the most abundant compound). These samples also had higher levels of total tocopherols; increase that can be related to plant defense mechanisms. However, both groups of compounds were adversely affected by 2 kGy. Furthermore, flavonoids correlated well with antioxidant properties.|
|Aparece nas colecções:||CIMO - Resumos em Proceedings Não Indexados à WoS/Scopus|
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|2018_ISEAC40_Abstracts_gamma_irrad_watercress_Pinela.pdf||374,84 kB||Adobe PDF||Ver/Abrir|
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