Effect of drying methods on physicochemical properties of wet- processing konjac powder

The indexes of wet- processing konjac powder dried by hot- air,vacuum- heating and microwave drying including color,porosity,packing density,swelling rate,viscosity and microstructure were determined respectively in order to investigate effect of drying methods on physicochemical properties of wet- processing konjac powder in this paper.The results showed that differences of physicochemical properties were significant for konjac powder dried by different method( p < 0.05).The konjac powder dried by vacuum- heating drying was white color,and had the highest swelling rate and viscosity( 34500 m Pa·s) owing to more homogeneous and finer porosity by comparison to those dried by hot- air drying and microwave drying. Thus,vacuum- heating drying could be a recommendable method for wet- processing konjac production.