Abstract
Because of its use in pharmaceutical preparations, the oil of evening primrose ( Oenothera biennis L.) must be subjected to rigorous analyses as part of any quality control programme. Gas chromatography (GC) can be applied for the determination of fatty acid content (especially that of γ-linolenic acid), but more complicated methodology may be necessary for structural analysis of triacylglycerols, for example. These and other methods for analysis of evening primrose oil are reviewed here.
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