XXIII Encontro Nacional da SPQ

Aveiro 12 a 14 de Junho de 2013

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Titulo Livro de Resumos do XXIII En contra Nacional da SPQ Desafios em Quimica

Coordenadores Diana C. G. A. Pinto e Artur M. S. Silva

Fotografias Jose M. G. Pereira

Fotografia da Capa Depm·tamento de Quimica e Laborat6rios Tecnologicos da Universidade de

Aveiro

Edit;iio

Data

Sociedade Portuguesa de Qui mica Av. da Republica, 45-3° Esq. 1050-187 Lisboa -Portugal

Junlw de 2013

Tiragem 350 Exernplares

Deposita Legal 360265/13

Impressiio e acabamentos Sersilito-Empresa Gr6.fica, Lda.

Catalogat;iio J•ecomendada Livro de resumos do XXIII Encontro Nacional da SPQ - Desafios em Quimica Universidadc de Aveiro, 2013 - 387 p.

Quimica - Congressos

Reservados todos os direitos. Esta publica~ao nao pode ser reproduzida ou transmitida, no todo ou em parte, por qualquer proccsso, eletr6nico, mecanico, fotoc6pia, grava~ao ou outros, sem previa autoriza~iio do Editor.

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Gamma and electron beam irradiation as an alternative for postharvest treatment: a case stud)' with chestnuts

Miircio Carocho," Amilcar L. Antonio,"·b·' Joao C.M. Barreira,"·d Lillian Barros," Andrzej Rafalski,' Albino Bento," lsabel C.F.R. FeJTcira"

·'Mountain Research Cell/er (C/MO), ESA. Polvtedmic lmtitute ofBraganra. Portugal; "IST/ITN Nuclear cmd Tecluwlogic Ins titute, Sacavc!m, Portugal; cDepartmem of Fundamental Physics. Universi~\' of

Salamanca, Spai11; "REQUIAITE, University <?f Porw, Portugal,- 1'fnstitute (~{Nuclear Chemisfl) 1 and Tecltnology, Warsaw, Polmul; ~ferreira@ipb.pt

Chestnut fmits are an important food commodity in the Northeast region of "Tnis-os­Montes", representing an income of approximately 17 M€ and being Porn1gal one of tht: world's biggt:st producer. Due to environmental concerns a broad spectrum fumigant, methyl bromide, was banned in 20 I 0 by the European Union. Since then, no adequate postharvest treatment has been implemented, fostering research on suitable altematives. Our research group has been testing gamma and electron beam irradiation as an alternative postharvest treatment for chestnuts. On a first attempt to evaluate the influence of irradiation, various doses were tested (0, 0.5, I, 3 and 6 kGy) along different storage times (0, 30 and 60 days). The effects were assessed in the most important chemical parameters, namely nutritional, antioxidant, sugar, fatty acid, tocopherol, organic acid and triacylglyccrol profiles, in which, all seemed to be altered to a greater extent by storage time than by the different doses. Another important conclusion was the validation of I kGy as the optimal dose for chestnuts conservation. This conclusion sustained the venture to extend the study to four varieties (Longal, Judia, Cotaand Palummina) with a fixed dose of I kGy for both gamma radiation and electron beam. The results were processed through principal component analysis and confinned that both gamma (1) and electron beam (2) irradiation showed high potential to be used as postharvest conservation technology. The most marked differences were found between the four different cultivars, especia lly Cola and Pafummina, while non-irradiated and irradiated chestnuts proved to have very similar profiles in all the assayed parameters, with irradiation having an attenuating clTcct.

(I) (2)

Acknowledgments: 77ze authors are thmzliful to ON.2/QRENIEU l'rojecl No./3198/2010, for support. A.L.A., LB. and J.C. M. B. thank FCT, POPH-QREN. and FSEjor PROTEC/6739812010, BPD/72802/20111 ond BPD/4611912008.

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