The refining process typically involves degumming (removing phospholipids), neutralization (removing free fatty acids), bleaching (using clays or activated carbon to lighten the color), and deodorization (steam stripping to eliminate volatile compounds). This makes virgin castor oil significantly more expensive but also the preferred choice for applications where chemical purity is paramount.
Castor Oil Made From Quality Control Laboratories: Ensuring Purity and Safety
Refining and Bleaching Regardless of the extraction method, crude castor oil often undergoes further refinement to remove impurities, odors, and color. From Seed to Shelf: The Final Product.
The seeds, which contain the toxic protein ricin and the potent oil, are harvested mechanically or by hand once they ripen to a brown color. The United States Pharmacopeia (USP) and the European Pharmacopeia (EP) set the international standards for medicinal castor oil, defining parameters for acidity, saponification value, and heavy metal content.
Castor Oil Made From Quality Control Laboratories: Ensuring Purity and Safety
These standards ensure that a bottle of castor oil purchased in one country will perform consistently anywhere else. There are two primary methods: cold pressing and solvent extraction.
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