Abstract
The quality of an α-tocopherol standard can be checked easily by measuring the UV absorbance at minimum (255 nm,A min) and maximum (292 nm,A max) wavelengths inn-hexane. If the quotientA min/A max exceeds 0.18, the standard contains less than 90% α-tocopherol and the determination at 292 nm will yield inaccurate results.
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References
Ball GFM (1988) Fat-soluble vitamin assays in food analysis. Elsevier, London, p 237
International Organization for Standardization (1994) Draft International Standard ISO/DIS 9936
Balz MK, Schulte E, Thier HP (1993) Fat Sci Technol 95: 215–220
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Balz, M., Schulte, E. & Thier, H.P. A new parameter for checking the suitability of α-tocopherol standards. Z Lebensm Unters Forch 202, 80–81 (1996). https://doi.org/10.1007/BF01229691
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DOI: https://doi.org/10.1007/BF01229691