Following this preparatory stage, the seeds undergo a critical step known as flaking, where they are crushed into thin, flat pieces to rupture cell walls and increase surface area. Furthermore, the deodorization step, while necessary for neutrality, can slightly diminish the levels of vitamin E, a natural antioxidant originally present in the seed.
From Seed to Drop: The Journey of Canola Oil
This refining stage involves several distinct procedures; neutralization removes free fatty acids using an alkali wash, while bleaching with activated clay eliminates color pigments and impurities. These seeds arrive at processing facilities carrying the promise of a neutral-flavored, heart-healthy cooking fat, ready to be liberated through a carefully orchestrated sequence of mechanical and chemical processes.
Prepress Solvent Extraction: The Core Separation For the majority of commercial production, the prepared flakes enter a prepress extractor, where they are cooked under heat and pressure to drive out a significant portion of the oil mechanically. This prepared material is then subjected to high-pressure rolling, which further breaks down the structure, making the oil within more accessible for efficient extraction in the subsequent stages.
From Seed to Drop: The Journey of Canola Oil
The resulting press cake, though oil-rich, still contains a substantial amount of residual fat that is difficult to remove with pressure alone. Once the refining is complete, the oil is transported to a storage facility where it is held in large tanks before bottling.
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