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(Science: chemical) An organic amine proton acceptor. It is used in the synthesis of surface-active agent and pharmaceuticals; as an emulsifying agent for cosmetic creams and lotions, mineral oil and paraffin wax emulsions, is a biological buffer, and is used as an alkaliser.

Pharmacological action: buffers, excipient.

Chemical name: 1,3-Propanediol, 2-amino-2-(hydroxymethyl)-