Microstructure of Dried Apples. Scanning electron micrographs
of fresh apple, dried in a critical point drier, are shown
in Figures 6 and 7. The cell walls are intact and the cells are
adhered to one another. There is highly organized cellular
compartment of the cells in three-dimensional form in the fresh
apple. Some cell damage is apparent and probably occurred
during sample preparation. The pores are few and small in size
compared to the cells. Similar micrographs of fresh apple were
presented by Lee et al
Figure 8 shows the exterior microstructure of apple dried at
different temperatures of 20-25 °C (Figure 8a), 40-45 °C
(Figure 8b), and 60-65 °C (Figure 8c), at a relative humidity
of 20-25%. These micrographs show differences in the exterior
microstructure of the apple slices dried at different temperatures.
In Figure 8a (temperature ) 20-25 °C, relative humidity )
20-25%), cells have maintained their three-dimensional organization,
but there are some areas where the cells appeared to
have collapsed. In addition, there are many pores among the
cells. In comparison, Figure 8b (temperature ) 40-45 °C,