Bio-fortification and isotopic labelling of Se metabolites in onions and carrots following foliar application of Se and 77Se

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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The aims were to bio-fortify onions by foliar application of selenium (Se) and to intrinsically label bioactive Se-metabolites in onion and carrot by enriched, stable 77Se for use in human physiological studies. Onion bulbs and leaves were enriched in Se by repeated foliar spraying of 10 or 100μgSeml−1 solutions of sodium selenite (Se(IV)) or sodium selenate (Se(VI)). ICP-MS analysis of onion leaves and bulbs showed that the Se concentration was enhanced by up to a factor of approximately 50 and 200 in bulbs and leaves, respectively. HPLC–ICP-MS analysis of proteolytic plant extracts showed that foliar application of Se(IV) gave rise to bio-synthesis of a higher fraction of the desired organic Se species and was better tolerated by the plants than Se(VI). Based on these findings onions and carrots were bio-fortified by foliar application of a solution of 77Se(IV) that was enriched to 99.7% as 77Se. The 77Se- labelled metabolites in onions were predominantly γ-glutamyl-77Se-selenomethyl-selenocysteine (γ-glu-Me77SeCys), 77Se-methylselenocysteine (Me77SeCys) and 77Se-selenomethionine (77SeMet). Furthermore, we report here for the first time the finding in carrots of the bioactive Me77SeCys, the identity of which was verified by HPLC–ESI-MS/MS.
Original languageEnglish
JournalFood Chemistry
Publication date2012
Volume133
Issue3
Pages650-657
ISSN0308-8146
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 4

Keywords

  • Foliar application, Onion, Carrot, Methylselenocysteine, Intrinsic 77Se labelling, HPLC–ESI-MS/MS
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