RESÍDUOS DE 14C-PROCHLORAZ EM MANGAS IRRADIADAS
2001
O objetivo deste trabalho foi avaliar os niveis residuais de
Prochloraz aplicado em mangas, na pre e pos-colheita apos
o tratamento com radiacao. Os frutos foram submetidos a
radiacao gama na dose de 1,0 kGy visando verificar se a
mesma induziu a degradacao do fungicida. As mangas
tratadas na pos-colheita foram armazenadas por 21 dias a
12 °C. Os residuos de Prochloraz nao apresentaram
decrescimo durante o periodo de carencia (21 dias)
estabelecido pela Legislacao Brasileira de Agrotoxicos. O
armazenamento refrigerado (12 °C) e a irradiacao gama
tambem nao contribuiram para a degradacao do fungicida.
O Prochloraz ficou retido principalmente na casca (media =
1,64 µg/g), que funcionou como barreira a contaminacao da
polpa (media = 0,06 µg/g). O produto de degradacao, formado
nas cascas das mangas tratadas na pos-colheita, foi
identificado como sendo o BTS 44596. Os metabolitos,
encontrados em niveis baixos, confirmaram a ocorrencia
de baixa degradacao do fungicida em mangas.
14C-PROCHLORAZ RESIDUES IN IRRADIATED MANGOES
Abstract
The aim of this work was to evaluate the Prochloraz residual levels applied in mangoes,
in pre and post-harvest after radiation treatment. The fruits were submitted to gamma
radiation with of 1,0 kGy dose, aiming to verify if it induces the fungicide degradation.
Treated post-harvest mangoes were stored, at 12 0C during 21 days. Prochloraz residues
did not present reduction after safe period (21 days), established by the Brazilian
legislation on agrochemicals. The refrigerated storage (12 0C) and the gamma radiation
also did not contribute to the degradation of the fungicide. Prochloraz was mainly retained
in the peels (mean = 1,64 µg/g) which served as barrier to the pulp (mean = 0,06 µg/g)
contamination. The degradation product, formed in peels of post-harvest treated mangoes
was the metabolite BTS 44596. The metabolites found in very low levels, confirm that
low fungicide degradation occurs in mangoes.
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