A bottom-up approach identifying equivalent effects of high-pressure processing (HPP-600 MPa, 20 °C, 10 min), thermal treatment (TT-70 °C, 15 min) and high pressure-mild thermal processing (HPMT-600 MPa, 50 °C, 10 min) on quality and stability of peach-strawberry puree was applied during refrigerated storage. TT and HPP ensured 3-log aerobic bacteria inactivation at first, while HPMT reduction was below the detection limit. After 21 days all samples had equivalent microbiological stability. A 2.6-fold increase in the residual activity of PPO and POD was found in the HPP sample compared to TT and HPMT samples (1st day); after 21 days PPO, POD and TPC were equivalent for TT and HPP peach-strawberry purees. Equivalent volatile profile and rheology behavior was observed after 21 days of all samples' storage. Meanwhile, the color of the HPP, TT and HMPT samples remained significantly different (p < 0.05) throughout the whole storage period, with the lowest browning index registered for HPP samples.
Keywords: equivalent effects; high pressure; peaches; refrigerated storage; strawberries; thermal treatment.