The feed flow rate negatively affected powders moisture con- tent. Higher flow rates imply in a shorter contact time between the feed and the drying air, making the heat transfer less efficient and resulting in lower water evaporation. Hong and Choi (2007) investigated the physicochemical properties of protein-bound polysaccharide from Agaricus blazei Murill prepared by ultrafiltra- tion and spray drying process. The authors verified that the pow- ders moisture content increased with increasing pump rate and with decreasing inlet air temperature, and the effect of tempera- ture was greater than the effect of pump rate.