title: Variations in the accumulation, localization and rate of metabolization of selenium in mature Zea mays plants supplied with selenite or selenate.
abstract: Quantification of selenium bioavailability from foods is a key challenge following the discovery of the antioxidant role of this micronutrient in human health. This study presents the uptake, accumulation and rate of metabolization in mature Zea mays plants grown in hydroponic solution supplemented with selenate or selenite. Selenium content was lower in plants supplemented with selenate and accumulated mainly in the leaves compared with selenite-treated plants where the selenium was retained in the roots. Selenite-treated grains accumulated more selenium. Selenate was metabolized less than selenite in whole plants, but in grains selenium was present exclusively as organic selenium compounds. For humans, the bioavailability of organic selenium was evaluated at 90% compared with only 50% for inorganic forms. Our results show that the potential for selenium bioavailability is increased with selenite treatment.
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS - EPHE - UMR 7916 METIS, F-75005 Paris, France.
authors.forename: Mélanie
authors.initials: M
authors.lastname: Longchamp
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS - EPHE - UMR 7916 METIS, F-75005 Paris, France. Electronic address: maryse.rouelle@upmc.fr.
authors.forename: Maryse
authors.initials: M
authors.lastname: Castrec-Rouelle
authors.affiliation: UPMC Univ Paris 06, CNRS - iEES, Campus INRA - AgroParisTech, F-78550 Thiverval-Grignon, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Biron
authors.affiliation: UPMC Univ Paris 06, CNRS - iEES, Campus INRA - AgroParisTech, F-78550 Thiverval-Grignon, France.
authors.forename: Thierry
authors.initials: T
authors.lastname: Bariac
mesh_terms: D001682:Biological Availability; D018515:Plant Leaves / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry*; D064586:Selenic Acid / Q000737:chemistry*; D020887:Selenious Acid / Q000737:chemistry*; D012643:Selenium / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry* / Q000378:metabolism
chemical_list: D020887:Selenious Acid; D012643:Selenium; D064586:Selenic Acid
keywords: Biofortification; Enzymatic extraction; Organo-selenium compounds; Selenate; Selenite; Selenium bioavailability