During the osmotic treatment, increasing sucrose concentrations from 50 to 70°Brix resulted in increased water loss at the first 5 min from 46.43±1.8 to 66.94±2.01% (Figure 1(a)) and solid gain from 16.23±0.60 to 23.20±0.51%. At 20 min of the osmotic dehydration solid gain increased from 13.87±1.63 to 25.43±1.60% (Figure 1 (c)). The increasing on solids gain and water loss with the solution concentration is due to the high concentration difference between the lemon peel samples and osmotic solution which increased the rate of diffusion of solute and water exchange with osmotic solution. Lazarides etal. [18] attributed the increased mass transfer of sugar molecules with increasing concentration to possible membrane swelling effect,