Abstract
Mass, volume, electrical and mechanical properties of four apple cultivars after high hydrostatic pressure (HHP) treatment were investigated. Volume changes were greater than those of mass after HHP treatment. Electric properties were measured by electrical impedance spectroscopy, and their frequency dependences were analyzed using the Cole-Cole plot and cell-based electrical circuit model (modified Hayden model). The analyzed electric parameters showed differences among the cultivars, indicating cell membrane damage after HHP treatment. HHP treatment also affected the mechanical properties such as breaking stress and strain, indicating changes in cell structure. However, the mechanical properties after HHP treatment of ‘Shinanogold’ and ‘Fuji’ fruit were retained to a greater extent than those of ‘Jonathan’ and ‘Jonagold’ despite cell membrane destruction. This study is the first to reveal cultivar differences in the physical property changes after HHP treatment and their tolerances to treatment.
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