2007
DOI: 10.1039/b608041c
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ICP-MS-assisted nanoHPLC-electrospray Q/time-of-flight MS/MS selenopeptide mapping in Brazil nuts

Abstract: A method was developed for the identification of selenium-containing peptides issued from proteins of a Se-rich (82.9 mg kg À1 ) foodstuff, Brazil nut (Bertholletia excelsa). A sample purification procedure was optimized to cope with the 100-fold excess of sulfur analogues and matrix interferences. It was based on the consecutive size-exclusion fractionation of proteins and tryptic peptides, and enrichment of the Se-containing fractions, prior to nanoHPLC-ES-Q/TOF MS/MS. The characteristic isotopic patterns of… Show more

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Cited by 56 publications
(53 citation statements)
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“…This non-specific incorporation mechanism predicts plants can produce Se-containing proteins, but the proteins have not been identified. In Se-enriched yeasts, however, Lobinski and his co-workers identified hundreds of Se-containing proteins [16][17][18][19][20]. For each Se-peptide, they found there was a corresponding wild-type peptide containing Met at the position of SeMet.…”
Section: Introductionmentioning
confidence: 95%
“…This non-specific incorporation mechanism predicts plants can produce Se-containing proteins, but the proteins have not been identified. In Se-enriched yeasts, however, Lobinski and his co-workers identified hundreds of Se-containing proteins [16][17][18][19][20]. For each Se-peptide, they found there was a corresponding wild-type peptide containing Met at the position of SeMet.…”
Section: Introductionmentioning
confidence: 95%
“…Caruso and co-workers 18 studied the distribution of various elements of nutritional and toxicological interest in different molecular weight fractions, ranging from 0.18 to 14 kDa. Chemical speciation has been accomplished for As and Se in Brazilnut [20][21][22] and Ni, Cu, Zn and Mn in different edible nuts. 19,23 Cupuassu (Theobroma grandiflorum) has a whiteyellow pulp with pleasant acidic taste and a strong fragrance, which is widely consumed as juice, ice cream and jam.…”
Section: Introductionmentioning
confidence: 99%
“…[13][14][15][16][17] The concentrations of Ag, Al, Ag, As, Ba, Ca, Co, Fe, Hg, Mg, Mn, Mo, Pb, Se, Sr, and Zn associated to different molecular weight fractions of Brazil-nut were determined. 14- 22 Andrade et al 16 studied the elemental distribution of soluble organic species in a methanol plus chloroform mixture and water, as well as insoluble metal species in these extractants. Chunhieng et al 17 separated proteins of the Brazil-nut using sequential extraction with a mixture of methanol plus chloroform, water, sodium chlorine solution, ethanol, and sodium hydroxide solution to obtain lipids, albumins, globulins, prolamins, and glutelins fractions, respectively.…”
Section: Introductionmentioning
confidence: 99%
“…1 Especial atenção vem sendo dada à castanha-do-pará em função da alta concentração de selênio. [2][3][4][5][6][7][8] No entanto, outras frutas e sementes como é o caso das amêndoas de babaçu, xixá e sapucaia ainda são pouco conhecidas da comunidade científica, embora sejam consumidas nas comunidades do nordeste brasileiro.…”
Section: Introductionunclassified