Fig. 3. Effects of pulse frequency on the retention of vitamin C in orange
juice and gazpacho (mean ± SD). Treatments were performed at 25 kV/
cm, 400 ls and square bipolar pulses of 4 ls. Horizontal and discontinuous
horizontal lines correspond to a thermal treatment (90 C, 1 min) for
orange juice and gazpacho, respectively. Bars with different letters are
significantly different (p < 0.05).