Shelf life and sensory attributes of a fruit smoothie-type beverage processed with moderate heat and pulsed electric fields

Abstract Smoothie-type beverages are usually preserved by mild pasteurisation (MP) but combining moderate heat ( H ) and pulsed electric fields (PEF) could represent an alternative technique achieving similar, or better, microbiological safety and shelf life, and possibly lowering the thermal impact on physical and sensory product properties. Following H (55 °C after 60 s) and PEF (34 kV/cm, 60 μs) the microbiological shelf life of smoothie stored at 4 °C was extended over that of mildly pasteurised (72 °C, 15 s) smoothie (21 vs. 14 days ( P P  ≥ 0.05). H/PEF-treated smoothie achieved better stability of Brix and viscosity than MP ( P P P  ≥ 0.05). Due to superior microbiological shelf stability and generally comparable attributes of the smoothie-type beverage H/PEF preservation proved to be a feasible processing alternative to fruit smoothie treatment with MP.

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