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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).
Propylene glycol is generally regarded as safe for use in food. Ethylene glycol has been found in at least 34, and propylene glycol in at least 5, of the 1,416 National Priorities List sites identified by the Environmental Protection Agency (EPA). For more information look at Cancer and the role toxic chemicals such as propylene glycol and ethylene glycol play...