Microbial inactivation and shelf life of apple juice treated with high pressure carbon dioxide.

Apple juice prepared from 'Annurca' apple puree was treated with a HPCD batch system. The pH, degrees Brix, color parameters and microbial load of the treated apple juice were compared with those of thermally processed juice. Thermal processes were carried out at 35, 50, 65, 85 degrees C and treatment times ranging between 10 and 140 minutes.