brassicasterol and its Impurities

Brassicasterol is a 28-carbon sterol synthesised by several unicellular algae and some terrestrial plants, like rape. This compound has frequently been used as a biomarker for the presence of algal matter in the environment, and is one of the ingredients for E number E499.. Reference standards of Brassicasterol API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below