Effects of non-thermal food processing techniques on the composition, bioaccessibility and shelf-life of bioactive compounds in a fruit juice blend

In this study, the effects at various conditions of high-pressure processing (HPP) at 600 MPa/3 min, 500 MPa/5 min, 500 MPa/10 min, pulsed electric field (PEF) at 120 kJ/L-24 kV/cm, 100 kJ/L-20 kV/cm, 100 kJ/L-15 kV/cm and thermal treatment (TT) at 80 °C/ 30 min on the stability, digestibility properties, and durability during shelf-life of phenolic compounds in fruit juice blend (21 % kiwi, 10.5 % mango, 37 % orange, 31.5 % blueberry) have been investigated. Results of this study indicated that the highest content on bioactive substance and antioxidant capacity values were obtained for HPP treatment at 600 MPa/3 min and for PEF treatment at 120 kJ/L-24 kV/cm. After in vitro digestion, the highest total phenolic content (TPC), total flavonoid content (TFC) and total anthocyanin content (TAC) values were detected in the PEF treated samples. Moreover, the bioactive content of the non-thermal-treated samples was found to be protected as that of thermal-treated sample during storage, except for individual anthocyanin and vitamin C contents in HPP-treated samples.