Yeasts．Riched selenium

Synonyms: Selenium-Enriched Yeast, Selenium Yeast, Selenized Yeast, High-Selenium Yeast, Se-Yeast, Saccharomyces cerevisiae (selenium-enriched)

Selenium-enriched yeast is a nutritional ingredient produced by cultivating selected strains of Saccharomyces cerevisiae in a medium fortified with inorganic selenium, typically sodium selenite or selenate. During fermentation, the yeast cells actively take up and metabolize the mineral, converting it into organic selenium compounds—predominantly selenomethionine, along with smaller amounts of selenocysteine and other selenoamino acids. This biotransformation is what distinguishes the product from simple mineral salts: the selenium is genuinely incorporated into the yeast’s protein matrix, not merely adsorbed onto its surface.

The nutritional significance of this organic form lies in its bioavailability and metabolic fate. Selenomethionine, the dominant species, is absorbed via the same intestinal transporters as methionine and can be incorporated non-specifically into body proteins, creating a labile selenium pool that supports long-term selenium status. In contrast, inorganic selenium salts follow different absorption pathways and are more readily excreted. For formulators, this translates into better retention and a gentler profile, particularly when compared with selenite, which has a narrower margin between nutritional benefit and potential toxicity.

Commercial selenium-enriched yeast is standardized by total selenium content, with common grades ranging from 1000 ppm to 2000 ppm, and sometimes higher for premix applications. The specification also defines the proportion of organic selenium—typically expressed as the percentage of selenomethionine relative to total selenium—which serves as a quality marker for the fermentation process. Regulatory acceptance varies by region: the European Union, for example, recognizes selenium-enriched yeast as a source of selenium in food supplements and feed, provided it meets defined compositional criteria, while the United States allows it as a dietary ingredient in supplements.

In practice, selenium-enriched yeast is used across dietary supplements, functional foods, and animal nutrition. It appears in multivitamin-mineral tablets, standalone selenium capsules, sports nutrition products, and selenium-enriched eggs or meat when included in livestock feed. Its stability in dry blends and its compatibility with other micronutrients make it a practical choice for solid dosage forms, while its organic nature appeals to formulators targeting premium, naturally derived labels.

機能

• 抗酸化防御: Selenium is an essential cofactor for glutathione peroxidase and other selenoproteins that neutralize peroxides and protect cellular membranes from oxidative damage.
• Thyroid hormone metabolism: Selenoproteins such as iodothyronine deiodinases convert thyroxine (T4) to its active form T3, supporting normal thyroid function.
• 免疫サポート: Adequate selenium status is associated with healthy immune cell proliferation and antibody production; deficiency can impair immune response.
• Cardiovascular protection: Selenoproteins help regulate oxidative stress and inflammation in vascular tissue, contributing to cardiovascular health.
• Reproductive health: Selenium supports spermatogenesis and is a structural component of the selenoprotein PHGPx in sperm mitochondria.
• Heavy metal antagonism: Organic selenium can form inert complexes with mercury and other heavy metals, reducing their toxicity in animal models.

Source & Standardization

• 出典: Saccharomyces cerevisiae cultured in a selenium-supplemented medium
• Production: Aerobic fermentation under controlled conditions, followed by heat inactivation, drying, and milling
• Standardization: Total selenium content typically 1000–2000 ppm, with selenomethionine representing ≥ 60–70% of total selenium
• Forms: Light yellow to brownish-yellow fine powder; also available as granules or premix blends
• 用途: Dietary supplements, functional foods, animal feed premixes, selenium-enriched food production

仕様

資料・供給

• 月間処理能力: 20 metric tons
• リードタイム: 3～5営業日（在庫品）
• ドキュメント: COA, MSDS, TDS, nutritional analysis, allergen statement, GMO-free declaration
• パッケージ: 25 kg fiber drum with food-grade PE liner; custom packaging available on request

見積依頼

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