Walkling-Ribeiro et al. (2009) tested the use of thermosonication
(TS) (30 kHz, 55 °C, 10 min) combined with pulsed electric fields
(PEF) (40 kV/cm, 150 μs) – TS/PEF – for preservation of orange
juice. Immediately after the treatment, color was rated equivalent
for TS/PEF- and thermally-treated juice (94 °C for 26 s), but after
168 days of storage at 25 °C, color attributes were significantly affected.
The authors concluded that during long-term storage, TS/PEF-treated
juice proved to be less consistent with regard to juice color stability compared
to conventional thermal treatment.