title: A new parameter for checking the suitability of alpha-tocopherol standards.
abstract: 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.
authors.affiliation: Institut für Lebensmittelchemie, Westfälischen Wilhelms-Universität, Münster, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Balz
authors.forename: E
authors.initials: E
authors.lastname: Schulte
authors.forename: H P
authors.initials: HP
authors.lastname: Thier
mesh_terms: 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*
chemical_list: D014810:Vitamin E