2.3. Ultrasound treatment
Ultrasound treatments of apple juice were performed by putting
80 mL of sample in 100 mL jacketed vessel. As shown in Table 1,
two types of ultrasonic treatments were carried out: in-bath (a)
and with ultrasonic probe (b). In case of a, jacketed vessel containing
apple juice sample was put in an ultrasonic bath cleaner of
SB-500 DTY (Ningbo Scientz Biotechnology Co., Ltd., Ningbo, China)
working at 25 kHz frequency, radiating 70% of power (500 W) and
the samples were ultrasound treated at 20, 40 and 60 C for 30 min
(USB20-30, USB40-30 and USB60-30). The ultrasonic density of the