NS was inoculated with Lactobacillus plantarum culture (10% MRS broth (Beijing Solarbio Science & Technology Co., Ltd).; 3.1% of inoculation amount; pH 7.0) and fermented for 3.2 days at 37.6˚C. After fermentation, the culture was freeze-dried and smashed. The FNS and the raw NS powders were stored at -20˚C for later use.
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