Total phenols and flavonoids levels were
enhanced after being treated with various pressure
levels. In particular, at a pressure of 600 MPa both
of these compounds showed a significant increase
(P≤0.05). At the same pressure levels, temperature
had no effect on these compounds (Table 3). Cao
et al. (2011) found that total phenols in strawberry
pulp were unchanged after pressurization at 400-600
MPa for 5-25 min, while these components were
apparently improved in blueberry (Barba et al., 2013)
and pomegranate (Varela-Santos et al., 2012) juices
when high pressure did. Of note was that phenols
and flavonoids appeared to be pressure tolerant than
ascorbic acid. Corrales et al. (2008) stated that the
increase of phenol contents in the products might be
due to the rupture of plate tissues by the increased
pressure.