RS ISO 20633: 2015
Infant formula and adult nutritionals — Determination of vitamin E and vitamin A by normal phase high performance liquid chromatography


This International Standard specifies a method for the simultaneous quantitative determination of vitamin E (?-tocopherol and ?-tocopheryl acetate) and vitamin A (13-cis and all-trans isomers of retinyl
palmitate and retinyl acetate) present in all forms of infant and adult formulas (powders, ready-to-feed
liquids and liquid concentrates).
Retinol is not used for fortification purposes and therefore is not addressed in this method. The innate
amount in products is insignificant.
Stereoisomers of vitamin E, ?-tocopherol and ?-tocopheryl acetate, are not differentiated in this method.

General Information

RS ISO 20633: 2015ADOPTED ISO STANDARDSFood technology29First Edition
Nov 2021
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