Investigation of selected thermal and non-thermal preservative techniques to produce high quality and safe to drink sour cherry, red grape and pomegranate juices

Red-coloured fruit juices, due to their main bioactive components such as phenolic compounds and anthocyanins, have gained much attention. Present study was focused on the evaluation of pasteurization (at 90 °C for 30 s), mild heat treatment (at 60 °C for 8 min), sonication (at amplitude level of 42.7 μm and 25 °C for 8 min) and thermosonication (at amplitude level of 42.7 μm and 60 °C for 8 min) preservation techniques, on physico-chemical and safety attributes of red grape, pomegranate and sour cherry juices. The results indicated that all four treatment methods, had insignificant effects on brix, pH and titratable acidity of the treated fruit. Furthermore, while pasteurization had significant ( p