Abstract
The objective of this study was to investigate the textural changes of apple slices undergoing convective drying. Texture profile analysis (TPA) measurements at 20% compression clearly showed three periods in texture development: softening, uniform hardness, and hardening. In the period of softening, the initial hardness of 2,260 g exponentially decreased to 40–90 g, remained low in the moisture content range of 3.0–0.5 g/g, and rapidly increased below 0.5 g/g. Cohesiveness, springiness, resilience, and chewiness demonstrated similar three-phase behavior with the dependence on moisture content in the period of softening, constant values in the period of uniform hardness, and an inversion point below 0.5 g/g. In the period of hardening, the texture parameters were dependent on temperature.
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