Conclusions
The application of Ultrasound at the stage of dried sour cherry production
resulted in the enhancement of mass transfer after osmotic
dehydration, which led to a higher dry matter content and lower
water activity in 60US sample after drying when compared to 0US..
Directly after processing, the US treatment seems to have had a
negative effect on anthocyanin retention, although the differences
were not significant. Despite the deterioration caused by storage,
significant differences between US treated and untreated samples
became visible after 8 weeks of storage. During storage antioxidant
potential decreased gradually and no substantial decline was
observed, as was also the case with anthocyanins. However, samples
treated with an US application had a lower antiradical capacity
than those untreated. It can be anticipated that ultrasound application
had a negative influence on anthocyanin content and may
quicken the loss of antioxidant potential.