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Evening Primrose Oil
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Evening primrose oil is extracted from the evening primrose plant ( Oenothera biennis), a wildflower found in North America, Europe and parts of Asia. The plant's pale yellow flowers open in the evening--hence its common name--and its seeds bear the special fatty oil that is used today.
An important source of γ-Linolenic acid, evening primrose ( Oenothera spp.) is grown in temperate regions. The level of γ-Linolenic in evening primrose oil can vary from 8% to 10.5%. Additionally, evening primrose oil contains one of the highest levels of linoleic acid.
General Specifications: Min - Max
Acid Value (mg KOH/g): n/a - 1.5
Peroxide Value (mEq/Kg): n/a - 5.0
Iodine Value (gI 2/100g): 150 - 165
Saponification Value (mg KOH/g): 180 - 165
Unsaponifiable Matter (%): n/a - 2.5
Specific Gravity 20°C (g/mL): 0.921 - 0.931
Fatty Acid Composition: Area %
C 16:0 Palmitic Acid: n/a - 10
C 18:0 Stearic: n/a - 3
C 18:1 Oleic: 4 - n/a
C 18:2 Linoliec: 70 - n/a
C 18:3 γ Linolenic: 9 - n/a
C 18:3 α Linolenic: n/a - 1
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