不同截留分子质量超滤膜在米醋澄清中的应用研究

分别采用截留分子质量为350 ku、300 ku、250 ku、200 ku和150 ku的超滤膜过滤米醋，对超滤平均通量、通量稳定性、米醋澄清度及盐析蛋白析出量进行比较分析，优选适于米醋过滤的超滤膜。结果表明，200 ku分子质量超滤膜超滤米醋过程中即能保证较高的超滤稳定性、平均超滤通量，实现长时间连续运行，又能有效降低米醋清液盐析后的蛋白析出量，对米醋货架期稳定性有较大的改善作用。

Application research of ultrafiltration membrane with different molecular weight cut-off in rice vinegar clarification

The ultrafiltration membrane with molecular weight cut-off (MWCO) of 350 ku, 300 ku, 250 ku, 200 ku and 150 ku were used for ultrafiltration of rice vinegar. The average ultrafiltration flux, flux stability, rice vinegar clarity and salting-out protein precipitation yield were compared and analyzed. The ultrafiltration membrane which was suitable for filtration of rice vinegar was optimized and selected. The results showed that ultrafiltration membrane with 200 ku MWCO not only could ensure higher ultrafiltration stability and average ultrafiltration flux for long time continuous operation, but also could decrease effectively protein precipitation amount after rice vinegar clear liquid salting out, which had greater improvement effect on the shelf life of rice vinegar stability.