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Propylene glycol is a clear, colorless and hygroscopic liquid. Propylene glycol contains an asymmetrical carbon atom, so it exists in two enantiomers. The commercial product is a racemic mixture.Pure optical isomers can be obtained by hydration of optically pure propylene oxide.t is produced on a large scale and is primarily used in the production of polymers but also sees use in food processing as the E-number E1520. The compound is sometimes called Î±-propylene glycol to distinguish it from the isomer propane-1,3-diol (Î²-propylene glycol).
The Food and Drug Administration (FDA) permits Butylene Glycol to be used as a synthetic flavoring and adjuvant for direct addition to food. Butylene Glycol, Hexylene Glycol and Dipropylene Glycol are allowed to be used as indirect food additives. For example, Butylene Glcyol may be used in polymeric coatings in contact with food, and Hexylene Glycol and Dipropylene Glycol may be used in adhesives in contact with food. The safety of Butylene Glycol and related ingredients has been assessed by the Cosmetic Ingredient Review (CIR) Expert Panel.