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In this study, the impacts of two different pear cultivars, "Conference" and "Alexander Lucas", on the kinetics and the final quality of samples dried by convection (CD) and microwave-convection (MCD) methods, were investigated. The quality of dried material was evaluated by the analysis of water activity, porosity, color, acoustic emission (AE) and mechanical and sensory properties. The required drying time to obtain 0.2 kg H 2 O/kg dry solid (d.s.) was longer for "Conference" than "Alexander Lucas" and was 20 min by CD and 5 min by MCD. The pear cultivar, in conjunction with the drying method (CD or MCD), affected the number of AE events and the work of breaking. The CD pear of the "Conference" cultivar was characterized by higher force, higher breaking work and stronger AE relative to the CD pear of the "Alexander Lucas" cultivar. There were no differences in taste or overall quality, but the hardness was higher for the CD "Conference" pear. A principal component analysis showed that panelists preferred dried fruit with good taste and overall quality but lower hardness. A positive correlation was found between the number of acoustic events and sensory hardness; thus, an acoustic method can be useful for effectively evaluating the texture of dried pears. These results show that the dried pear slices that generated fewer AE events upon breaking were perceived as better by the panelists.

Influence of Pear Variety and Drying Methods on the Quality of Dried Fruit