New reference material for wine authenticity testing
IRMM has released a new certified reference material (STA-003k) for the authenticity testing of wines. Tetramethylurea (TMU) has been certified for its deuterium-to-hydrogen (D/H) amount-of-substance ratio. This material is a successor of STA-003, the previous TMU batch.
STA-003k shall be used in site-specific natural isotope fractionation - nuclear magnetic resonance (SNIF-NMR) spectroscopy measurements as internal standard for determining D/H ratios of ethanols distilled from wines, an important measure in wine authenticity testing (Commission Regulation (EC) No 2676/90).
The material is available in 0.5 L quantities in dark glass bottles with cap and wax coating, and shall be stored in the dark at room temperature. Homogeneity and stability of the material were assessed, and within the shelf life stability is guaranteed. The certified value was accomplished in an interlaboratory comparison by strictly adhering to the SNIF-NMR Community protocol described in the Commission Regulation (EC) No 2676/90.