The combined effect of pressure and temperature on the antioxidant activity is more marked at a longer treatment time. Ludikhuyze and Hendrickx (2002) reported that antioxidant capacity of orange juice decreased with increasing pressure
(200–600 MPa) at temperatures ranging from 30 to 70 °C as a function of treatment time (up to 20 min). With the increase in temperature up to 60 °C, GAEAC values decreased significantly (p b 0.05),
indicating reduced in-vitro antioxidant activity, though this loss
was within 10% of that in unprocessed sample