A new parameter for checking the suitability of alpha-tocopherol standards.
The quality of an alpha-tocopherol standard can be checked easily by measuring the UV absorbance at minimum (255 nm, Amin) and maximum (292 nm, Amax) wavelengths in n-hexane. If the quotient Amin/Amax exceeds 0.18, the standard contains less than 90% alpha-tocopherol and the determination at 292 nm will yield inaccurate results.
Balz
M
M
Institut für Lebensmittelchemie, Westfälischen Wilhelms-Universität, Münster, Germany.
Schulte
E
E
Thier
H P
HP
D002851:Chromatography, High Pressure Liquid; D005504:Food Analysis / Q000592:standards*; D012015:Reference Standards; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet; D014810:Vitamin E / Q000032:analysis* / Q000592:standards*
D014810:Vitamin E