Identification and determination of selenohomolanthionine - The major selenium compound in Torula yeast.

Katarzyna Bierła, Noriyuki Suzuki, Yasumitsu Ogra, Joanna Szpunar, Ryszard Łobiński

Food chemistry 2017 Dec 15

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Torula yeast (Candida utilis) was found to metabolize selenium in a totally different way to Brewer's yeast (S. cerevisiae) leading to the biosynthesis of selenohomolanthionine (SeHLan), a major selenium compound accounting for 60-80% of the total selenium. The identity of SeHLan was confirmed by retention time matching in hydrophilic ion interaction chromatography (HILIC) with inductively coupled plasma mass spectrometric detection (ICP MS) using a custom synthesized standard molecule and by HILIC - Orbitrap MS and MS-MS fragmentation. Selenohomolanthionine escapes the current assays for the organic character of Se-rich yeast based on the protein-bound selenomethionine determination. A HILIC - ICP MS method was developed for the quantitative determination of selenohomolanthionine in yeast supplements with a detection limit of 146ng/g. Copyright © 2017 Elsevier Ltd. All rights reserved.

Citation

Katarzyna Bierła, Noriyuki Suzuki, Yasumitsu Ogra, Joanna Szpunar, Ryszard Łobiński. Identification and determination of selenohomolanthionine - The major selenium compound in Torula yeast. Food chemistry. 2017 Dec 15;237:1196-1201