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Selenium / Selenium sources
  • Functions
              Selenium is an essential trace element which fulfills important tasks in           different metabolism processes. It is involved in the regulation of the           thyroid hormone metabolism and the redox status of vitamin C.
              Another very important function is the defense against oxidative stress by           forming of the enzyme glutathione peroxidase. This enzyme protects the           cell membrane against peroxidative damage by destroying peroxides           coming from other metabolism activities.

              A sufficient selenium supply in animal feed is necessary to avoid different           deficiency symptoms and diseases like
                        - white muscle disease
                        - cardiac failure/mulberry haert disease
                        - liver necrosis
                        - exsudative diathesis
                        - disturbances in growth and conception
                        - reduced immune response
  • Main sources of selenium
              Sodium Selenite
              Sodium Selenate
  • Quality parameters
              Biological availability
              Sodium selenite and sodium selenate are highly water soluble.
              The bioavailability is referred to vary between 85 and 95%.
              After intake sodium selenite is quickly metabolised to precursors for
              the synthesis of selenoproteins.

    Purity (undesirable elements)
              As < 12 ppm
              Cd < 5 ppm
              Hg < 0,1 ppm
              Pb < 30 ppm

    Stability
              Sodium selenite and selenate are chemically stable but very hygroscopic.
              They take up moisture from the air up to 0.5% even under
              dry storage conditions.
              Appropriate storage in suited containers is necessary to keep
              the quality of the product.

    Dusting behaviour
              Because of the toxicity of selenium compounds heavy dusting products           should be avoided. An improved dusting behaviour can be reached with           special production procedures. Spray dried products show optimal                     properties in avoiding of dust release.
 
 
 
 
 
 
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