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Distribution of selenoglucosinolates and their metabolites in Brassica treated with sodium selenate.

Authors
  • Matich, Adam J1
  • McKenzie, Marian J
  • Lill, Ross E
  • McGhie, Tony K
  • Chen, Ronan K-Y
  • Rowan, Daryl D
  • 1 The New Zealand Institute for Plant & Food Research Limited (Plant & Food Research) , Private Bag 11600, Palmerston North 4442, New Zealand. , (New Zealand)
Type
Published Article
Journal
Journal of Agricultural and Food Chemistry
Publisher
American Chemical Society
Publication Date
Feb 25, 2015
Volume
63
Issue
7
Pages
1896–1905
Identifiers
DOI: 10.1021/jf505963c
PMID: 25625473
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In Brassica species, hydrolysis of (methylthio)glucosinolates produces sulfur-containing aglycons which have demonstrated anticancer benefits. Selenized Brassicaceae contain (methylseleno)glucosinolates and their selenium-containing aglycons. As a prelude to biological testing, broccoli, cauliflower, and forage rape plants were treated with sodium selenate and their tap roots, stems, leaves, and florets analyzed for selenoglucosinolates and their Se aglycons. Two new selenoglucosinolates were identified: glucoselenoraphanin in broccoli florets and glucoselenonasturtiin in forage rape roots. A new aglycon, selenoberteroin nitrile, was identified in forage rape. The major selenoglucosinolates were glucoselenoerucin in broccoli, glucoselenoiberverin in cauliflower, and glucoselenoerucin and glucoselenoberteroin in forage rape roots. In broccoli florets, the concentrations of selenglucosinolates exceeded those of their sulfur analogues. Fertilization with selenium slightly reduced (methylthio)glucosinolates and aglycons in the roots, but increased them in the florets, the leaves, and sometimes the stems. These discoveries provide a new avenue for investigating how consumption of Brassica vegetables and their organoselenides may promote human health.

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