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New CRM for Selenomethionine in yeast developed by NRC Canada is now on the market
(02.08.2005)
Institute for National Measurement Standards, National Research Council Canada recently completed the certification of selenized yeast reference material SELM-1.
Mineral supplementation represents a sizeable portion of the
multibillion dollar nutritional supplement / functional food / animal
feed business. Many of the supplemented metals are added as metal
enriched yeast (i.e., Zn, Cr, Se) to the final formulation. However,
there are currently no Certified Reference Materials available for
quality control of measurements characterizing these supplements.
In the case of Se enriched yeast, the question of the quality of the
product is even more difficult because most of the Se present is
covalently bound to carbon, forming the non-canonical amino acid
selenomethionine. Most of the functionality claims for Se
enriched yeast are related to its SeMet content.
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Selenium Enriched Yeast Certified
Reference Material: SELM-1
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CERTIFIED VALUES SELM-1
(milligram/kilogram) |
| Total Selenium |
2059 ± 64 |
| Selenomethionine |
3431 ± 157 |
| Methionine |
5758 ± 277 | * certification valid until Nov. 2006 |
It is intended that the expanded uncertainty UCRM
encompasses every aspect that reasonably contributes to the uncertainty
of the measurand (e.g. measurement uncertainty, homogeneity,
stability). A coverage factor of 2 was applied.
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