부산대학교 도서관

Non-thermal strategies have shown potential application in fruit processing. In this study, we evaluated the use of high hydrostatic pressure (HHP) (100–500 MPa) in the rheology of nectarine pulp and spray drying (190 °C/300.05 mL h−1) on powder properties. Empirical models were used to describe the rheological behavior of the pulp, in addition, the obtained powders were characterized in terms of their physical, morphological, structural and bioaccessibility properties. The treatment with HHP reduced the viscosity of the pulp, which showed pseudoplastic behavior and the Ostwald–de-Waele model showed the best fit (R2 > 0.99). While for the powder characteristics (yield between 34.58 and 59.19%), the GAB model best represents the water adsorption isotherms. The physical properties were influenced according to the applied pressure (p < 0.05) and zeta potential showed values in the range of − 28.78 mV to − 25.94 mV. It was seen that the pressure facilitated the extraction of total phenolic compounds, with a subsequent reduction in digestibility, the highlight being the pulp previously treated at 500 MPa, which presented a bioaccessibility of 31.61%. Morphologically, the increase in pressure changed the appearance of the surfaces from ovoid to spherical and rough, while for the FT-IR only the absorption intensities were modified. The HHP treatment applied to the pulp is a fast and efficient non-thermal method to improve the properties of the nectarine pulp and obtaining its powder by spray drying was feasible, guaranteeing greater stability during storage.Graphical abstract: