Foodstuffs - Determination of vitamin A by high performance liquid chromatography - Part 1: Measurement of all-trans-retinol and 13-cis-retinol; German version EN 12823-1:2000— 14 стр.
Foodstuffs - Determination of vitamin A by high performance liquid chromatography - Part 1: Measurement of all-E-retinol and 13-Z-retinol; German version EN 12823-1:2014— 18 стр.
Foodstuffs - Determination of vitamin A by high performance liquid chromatography - Part 2: Measurement of <beta>-carotene; German version EN 12823-2:2000— 14 стр.
Foodstuffs - Determination of vitamin A by high performance liquid chromatography - Part 1: Measurement of all-E-retinol and 13-Z-retinol; German version EN 12823-1:2014— 18 стр.