Evening primrose (<i>Oenothera</i> spp.) oil and seed

Abstract Evening primrose ( Oenothera spp.) seed contains ca. 15% protein, 24% oil, and 43% cellulose plus lignin. The protein is unusually rich in sulphur‐containing amino acids and in tryptophan. The component fatty acids of the oil are 65–80% linoleic and 7–14% of γ ‐linolenic, but no α ‐linolenic acid. The 1.5–2% unsaponifiable matter has a composition very similar to that of cottonseed oil. The sterol fraction contains 90% β ‐sitosterol and the 4‐methyl sterol fraction contains 48% citrostadienol; γ ‐tocopherol dominates its class, with some α ‐ but no other tocopherols.

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