Abstract: The objectives of the study were to understand the effects of different ion-exchange membranes,including homogeneous membrane,heterogeneous membrane and alloy membrane,on the compositions of metal ions and its effect on sensory quality of asparagus juice during the process of electrodialysis.The results suggested that electrodialysis can effectively reduce the concentration of metal ions in asparagus juice,but the effects were varied depending on the natures of ion-exchange membranes.Under the same voltage and current,the proportion of ions removed by homogeneous membrane was low,while heterogeneous membrane was too high.This resulted in the loss of nutrient components,and the alloy membrane could appropriately regulate metal ions without losing nutrient components.Besides,the electrodialysis process did not affect the total content of saponin in asparagus juice.Moreover,the alloy membrane could regulate the concentration of organic acids,major metal ions and trace metalions.Furthermore,sensory evaluation showed that alloy membrane was more suitable to improve the quality of asparagus juice,the asparagus juice obtained by electrodialysis for 180 min with alloy membrane had the best quality.Using above treatment,the conductivity was decreased to 0.894% that of the original juice,and the soluble solid content was decreased to 84.2% of the original one.
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