These results indicate that the amount of easily accessible EO in orange peel is the same at any condition of
the sample, although the interaction between particle size with microwave may enhance the velocity at which the process begins (Fig. 2), and that the only mass transfer process that affects the oil extraction rate is the EO diffusion from the particle core to the region of broken cells (Sovova and Aleksovski, 2006; Wang and Weller, 2006), which is promoted at higher microwave power levels.