Preparation of polyionic liquid membrane and its application in low-sodium and high-potassium healthy soy sauce
Soy sauce usually contains a high concentration of NaCl due to the fermentation process as well as shelf-life requirements,while excessive NaCl intake as well as low potassium intake by the human body can cause physical diseases.Therefore,in this study,electrodialysis was used to replace Na+with K+to achieve the preparation of low-sodium and high-potassium healthy soy sauce.Firstly,experiments were carried out using commercial membranes and it was found that the Na+removal rate was 37.3％and the K+increase factor was 2.83 times.It could not reach the best standard of low-sodium and high-potassium healthy soy sauce(Na+content reduced by half and K+content increased by five times).Therefore,the polyionic liquid membrane was prepared and applied to the electrodialysis experiment,and the Na+concentration in soy sauce was reduced from the initial 2.6 mol/L to 1.39 mol/L,and the K+concentration was increased from the initial 0.18 mol/L to 0.93 mol/L,which was very close to the best standard of low-sodium and high-potassium healthy soy sauce.
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