Chemical Name: 1,2,3-propanetriol or propane-1,2,3-triol. It is a colorless, clear, viscous liquid; sweet taste; hygroscopic; its aqueous solution (1→10) shows a neutral reaction. It is miscible with water or ethanol in any proportion, slightly soluble in acetone, and insoluble in chloroform or ether.
Also known as: anhydrous citric acid, chemical name: 2-hydroxypropane-1,2,3-tricarboxylic acid. It is a colorless translucent crystal, white granule or white crystalline powder; odorless, with a very sour taste; its aqueous solution shows an acidic reaction. It is slightly efflorescent in dry air; it is very easily soluble in water, easily soluble in ethanol, and slightly soluble in ether. It is often used as a buffer, pH adjuster, flavoring agent, stabilizer, excipient, disintegrant, etc., for oral, intravenous, ophthalmic, nasal, and inhalation, and general external use.
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