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Could someone differentiate between the terms glycerol, glycerin, glyceryl and glyceride?

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There is no difference between glycerol and glycerin; they both refer to propane-1,2,3-triol (already answered here).

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Glyceryls refer to glycerol derivatives in which a hydrogen has been replaced (e.g. glyceryl trinitrate).

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Glycerides represent a specific example of glyceryls and are fatty acid esters derived from glycerol (e.g. triacetin).

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