Means with different superscripts on the same row indicate significant differences (P < 0.05).
TUV: ultraviolet irradiation for 30 min.
TPEF: pulsed electric field treatment at 40 kV/cm for 100 pulses.
TPEF+UV: sequence of PEF and UV.
TUV+PEF: sequence of UV and PEF.
TH72: heat treatment at 72 C for 26 s.
TH94: heat treatment at 94 C for 26 s.
GAE: Gallic acid equivalents.
PPO: polyphenol oxidase.
POD: peroxidase.
SED: standard error of difference.
a *, **, and *** refer to a P < 0.05, P < 0.01 and P < 0.001, respectively.