Determinação de elementos essenciais e tóxicos em cogumelos comestíveis por análise por ativação com nêutrons / ESSENTIAL AND TOXIC ELEMENT DETERMINATION IN EDIBLE MUSHROOMS BY NEUTRON ACTIVATION ANALYSIS

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

In this study concentrations of As, Br, Co, Cr, Cs, Fe, K, Na, Rb, Se and Zn were determined in edible mushrooms acquired from commercial establishments in the city of São Paulo and directly from Mogi das Cruzes, Suzano, Juquitiba and Mirandópolis producers. The analytical technnique used for determining these elements in edible mushrooms was Instrumental Neutron Activation Analysis (INAA). Species of the Agaricus, Lentinus and Pleurotus genera were acquired during the period from November, 2006 to March, 2007. About 150 to 200 mg of freeze-dried mushrooms were irradiated in a neutron flux of 1012 cm-2 s-1 for 8 hours in the IEA-R1 nuclear research reactor at IPENCNEN/ SP. In order to evaluate the precision and accuracy of the methodology, four reference materials: INCT-MPH-2 Mixed Polish Herbs and INCT-TL-1 Tea Leaves, NIST SRM 1577b Bovine Liver, and the material Mushroom from IAEA were analyzed. Results showed some variation in the element concentrations among the different genera. In some samples, arsenic was found but in low concentrations. Arsenic is probably derived from the contamination from pesticides used in the cultivation, in their the substrates where mushrooms uptake their nutrients. Although there are element concentration variations, mushrooms can still be considered a very rich nutritional source, mainly because of their low concentratios of Na, and due to the good source of K, Fe and Zn.

ASSUNTO(S)

shitake elementos essenciais elementos essenciais shitake cogumelos cogumelos

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