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Study of selenium distribution in the protein fractions of the Brazil nut, Bertholletia excelsa
Thavarith Chunhieng1, Konstantinos Pétritis, Claire Elfakir
1Cirad-Amis, PAA, TA 40/16, 73 rue J.-F. Breton, 34398 Montpellier Cedex 5, France.
Abstract:
The high selenium content of the Brazil nut, Bertholletia excelsa, makes this seed a healthy food qualified as an antiradical protector. The studied nut contained 126 ppm of selenium. Selenium was found to be distributed in the nut protein fractions. The water-extracted fraction, which represented 17.7% of the cake protein, was the richest in selenium with 153 ppm. Analysis by HPLC-MS showed that selenium was linked by a covalent bond to two amino acids to form selenomethionine and selenocystine. The selenomethionine represented a little less than 1% of the total amount of methionine.
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