Fixed oil is derived from the seeds of the plant. Due to the highly polyunsaturated nature of the oil (=73%), extracts are obtained by cold-pressing rather than heat extraction. Flaxseed oil (FSO) is highly susceptible to photo-oxygenation, so it is packaged in opaque bottles. It is also susceptible to auto-oxidation, resulting in the production of hydroperoxides and aldehydes that can give a rancid flavour. Flaxseed oil 449
Encapsulated FSO Is considered more stable, particularly when antl-oxldants are added (Kolodziejczyk & Fedec 1995).
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