Selenium speciation and bioaccessibility in Se-fertilised crops of dietary importance in Malawi

Muleya, Molly; Young, Scott D.; Reina, Saul Vazquez; Ligowe, Ivy S.; Broadley, Martin R.; Joy, Edward J.M.; Chopera, Prosper; Bailey, Elizabeth H.

Abstract

© 2021 The Author(s) The purpose of this research was to explore the speciation and bioaccessibility of native soil-derived selenium (Se) versus Se applied via fertiliser in the edible portions of maize, groundnut and cowpea grown in Malawi. Fertiliser-derived Se, applied as isotopically labelled selenate, contributed 88–97% of the total Se in the edible portions. Both soil and fertiliser-derived Se were transformed into similar species, with more than 90% of the extracted Se in an organic form. The main form of fertiliser-derived Se in grain was selenomethionine with an abundance of 92.0 ± 7.6% in maize, 63.7 ± 6.2% in cowpea and 85.2 ± 1.9% in groundnut. In addition, cowpea contained 32.7 ± 6.2% of Se-methyl-selenocysteine. The mean bioaccessibility of fertiliser-derived Se was 73.9 ± 8.5% with no statistically-significant difference across all crops despite some variation in speciation. Understanding the contribution of fertiliser-derived Se to the formation of organic forms of Se in crops is crucial, given that organic Se species are more bioaccessible than inorganic forms.

Citation

Muleya, M., Young, S. D., Reina, S. V., Ligowe, I. S., Broadley, M. R., Joy, E. J., Chopera, P., & Bailey, E. H. (2021). Selenium speciation and bioaccessibility in Se-fertilised crops of dietary importance in Malawi. Journal of Food Composition and Analysis, 98, Article 103841. https://doi.org/10.1016/j.jfca.2021.103841

• Journal Article Type: Article
• Acceptance Date: Feb 3, 2021
• Online Publication Date: Feb 5, 2021
• Publication Date: May 1, 2021
• Deposit Date: Apr 25, 2021
• Publicly Available Date: Apr 26, 2021
• Journal: Journal of Food Composition and Analysis
• Print ISSN: 0889-1575
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 98
• Article Number: 103841
• DOI: https://doi.org/10.1016/j.jfca.2021.103841
• Public URL: https://nottingham-repository.worktribe.com/output/5369072
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0889157521000417?via%3Dihub