In this work, the solubility of natural and synthetic antioxidants in supercritical carbon dioxide is determined by a dynamic method in the pressure range 130-250 bar at 308.1-333.1 K. The compounds considered are ascorbic acid, ascorbyl palmitate, gallic acid, propyl gallate, lauryl gallate, alpha-tocopherol acid succinate and butyl hydroxyl anisole. The experimental data are correlated using the Peng-Robinson equation of state, and the solute properties are estimated by group contribution methods.