3.2. Effect of pulse polarity
As can be seen in Table 3, RC of lutein, β-carotene, vitamin C and TP,
as well as the RAC, were significantly influenced by pulse polarity. An
increment in the content of lutein (RC of 111.9%) and β-carotene
(RC of 112.3%) was observed when broccoli juice was treated by HIPEF
in bipolar mode; while applying pulses in monopolar mode, the RC of lutein
diminished up to 93.9% and β-carotene augmented up to 103.5%. In
agreement with the results reported in this research, HIPEF treatments
in bipolar mode led to higher carotenoid content in HIPEF-treated tomato
juice than that of monopolar mode (Odriozola-Serrano et al., 2007).