Effect of drying methods on physicochemical properties of wet- processing konjac powder
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摘要: 本研究以湿法魔芋精粉干燥产品的色泽、孔隙率、堆积密度、溶胀速度、黏度和微观结构为考察对象,比较分析了热风干燥、真空加热干燥和微波干燥三种方法对湿法魔芋精粉理化性质的影响,并对相关机理进行探讨。结果表明:三种干燥方法对本研究所考察的魔芋精粉理化性质都有显著的影响(p<0.05)。与微波干燥和热风干燥相比,真空加热干燥所得魔芋精粉颗粒颜色洁白,孔隙率最高,内部形成的微孔数量众多,且细小均匀,使得魔芋精粉溶胀速率最高,溶胶的黏度最大(34500 m Pa·s),溶胀性优于其他两种方式干燥的产品,较适用于魔芋湿精粉的干燥。Abstract: 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.
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