Fertilizing soil with selenium fertilizers: impact on concentration, speciation, and bioaccessibility of selenium in leek (Allium ampeloprasum)

Rama V. Srikanth Lavu, Gijs Du Laing, Tom Van De Wiele, Varalakshmi L. Pratti, Koen Willekens, Bart Vandecasteele, Filip Tack

    Research output: Contribution to journalA1: Web of Science-articlepeer-review

    3 Downloads (Pure)

    Abstract

    Leek was fertilized with sodium selenite (Na2SeO3) and sodium selenate (Na2SeO4) in a green house to assess the impact of selenium (Se) fertilization on Se uptake by the crop and its speciation in the crop. The bioaccessibility of Se in the Se enriched leek was assessed using an in vitro extraction protocol mimicking the human gastrointestinal tract (stomach, small intestine, and colon). The lowest Se uptake was observed when Na2SeO3 was used as a fertilizer, which results in a higher risk for Se accumulation in the soil on a longer term. When soil was amended with Na2SeO4, 55 ± 5% of total Se in the leek occurred in an inorganic form, while only 21 ± 8% was inorganic when Na2SeO3 was applied. Se-methylselenocysteine and selenomethione were the major organic species in both treatments. However, concentrations of Se-methylselenocysteine and ?-glutamyl-Semethyl -selenocysteine, which were previously reported to induce positive health effects, were lower as compared to other Allium species. The majority of the Se in the leek was found to be bioaccessible in the stomach (around 60%) and small intestine (around 80%). However, a significant fraction also has good chances to reach the colon, where it seems to be taken up by the microbial community and may also induce positive health effects.
    Original languageEnglish
    JournalJournal of Agricultural and Food Chemistry
    Volume60
    Pages (from-to)10930−10935
    Number of pages6
    ISSN0021-8561
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    Dive into the research topics of 'Fertilizing soil with selenium fertilizers: impact on concentration, speciation, and bioaccessibility of selenium in leek (Allium ampeloprasum)'. Together they form a unique fingerprint.

    Cite this