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    Biochemical Comparison of Commercial Selenium Yeast Preparations


    Fagan, Sheena and Owens, Rebecca A. and Ward, Patrick and Connolly, Cathal and Doyle, Sean and Murphy, Richard (2015) Biochemical Comparison of Commercial Selenium Yeast Preparations. Biological Trace Element Research, 166. pp. 245-259. ISSN 0163-4984

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    Abstract

    The trace mineral selenium (Se) is an essential element for human and animal nutrition. The addition of Se to the diet through dietary supplements or fortified food/feed is increasingly common owing to the often sub-optimal content of standard diets ofmany countries. Se supplements commercially available include the inorganic mineral salts such as sodium selenite or selenate, and organic forms such as Se-enriched yeast. Today, Se yeast is produced by several manufacturers and has become the most widely used source of Se for human supplementation and is also widely employed in animal nutrition where approval in all species has been granted by regulatory bodies such as the European Food Safety Authority (EFSA). Characterisation and comparison of Se-enriched yeast products has traditionally been made by quantifying total selenomethionine (SeMet) content. A disadvantage of this approach, however, is that it does not consider the effects of Se deposition on subsequent digestive availability. In this study, an assessment wasmade of the water-soluble extracts of commercially available Se-enriched yeast samples for free, peptide-bound and total water-soluble SeMet. Using LCMS/ MS, a total of 62 Se-containing proteins were identified across four Se yeast products, displaying quantitative/ qualitative changes in abundance relative to the certified reference material, SELM-1 (P value <0.05; fold change ≥2). Overall, the study indicates that significant differences exist between Se yeast products in terms of SeMet content, Secontaining protein abundance and associated metabolic pathways.

    Item Type: Article
    Keywords: Selenium; Yeast; Selenomethionine; Speciation; Supplementation; Proteomics; LC-MS/MS;
    Academic Unit: Faculty of Science and Engineering > Biology
    Item ID: 9249
    Identification Number: https://doi.org/10.1007/s12011-015-0242-6
    Depositing User: Dr. Sean Doyle
    Date Deposited: 13 Feb 2018 17:05
    Journal or Publication Title: Biological Trace Element Research
    Publisher: Humana Press
    Refereed: Yes
    URI:

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