Thus, the mechanism of far-infrared drying is different from that of hot
air drying (Sandu, 1986), so that the electromagnetic wave energy is
absorbed directly by the dried food with reduced energy loss. FIR is
thought to liberate and activate low molecular weight natural
antioxidant compounds, because it heats material without degrading
the constitutive molecules on the sample surface and it transfers heat
evenly to the center of the material (Niwa et al., 1988).