In peppers, ultrasound (47 kHz) might injure the cell wall
structure and induce changes in the texture. However, Cao et al. (2010) observed that ultrasound treatment
(40 kHz) inhibited the decrease of firmness in strawberries.
treated strawberries with different sanitizers
and observed that samples treated with ultrasound (35 kHz)
had 16% more firmness retention than the water-washed samples.
These different observations should be due to different treatment
conditions as frequency, time, amplitude.
A restricted number of reports discuss the flavour changes in
food treated with ultrasound. The free radicals produced by cavitation
might catalyse the degradation of flavour compounds. In
other cases, such as wine, ultrasound can decrease the off-flavours