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In order to improve the viable counts of Bifidobacterium bifidum BB01 in the liquid medium, the Central Composite Design (CCD) was used to optimize the nitrogen source in the medium of B. bifidum BB01. The results showed that the nitrogen source composition of B. bifidum BB01 was: peptone 0.9%, yeast extracts 0.3%, beef paste 0.7%. Under the optimal conditions, the viable counts of B. bifidum BB01 reached (2.49±0.06)×109CFU/mL after cultured at 18h, which was 42.97% higher than MRS (lactose),doi:10.1515/aucft-2016-0004 fatcat:5pi6s4y5sve6pna3dq3spxt24i