An ester is a functional group in organic chemistry; specifically a chemical compound derived from an acid in which at least one hydroxyl group is replaced by alkoxy group.

Ester may also refer to:

Food additives and chemistry

  • Ester C, ascorbyl palmitate, used as an antioxidant food additive
  • Ester gum, or Ester of wood rosin, a food additive used as an emulsifier and stabiliser
  • Ester pyrolysis, a vacuum pyrolysis reaction

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