The strains of commonly used fermented dairy products were used as the donor strains,and the selenium-rich strains were screened out by selenium-rich fermentation test from Lactobacillus paracasei,Bifidobacterium animalis,Lactobacillus plantarum,Streptococcus thermopiles.In addition,the response surface test was used to optimize the selenium-rich process of the optimal selenium-rich strains,in order to obtain the optimal selenium-rich process.According to the results,the selenium-rich ability of Lactobacillus paracasei was better than that of the other three lactic acid bacteria.The optimal selenium-rich process of Lactobacillus paracasei was as follows:the selenium content of the strain was 5844.22 mg/kg,the selenium addition amount was 2.07 mg/kg,and the selenium addition time was 5.76 h.Based on the above conditions,the yield of the final selenium-rich probiotic product was 333.34 mg/kg,and the selenium content was 14002.96 mg/kg.The validation test proved that the optimized process parameters are accurate and reliable.
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