Nitrogen source suitable for efficient proliferation of bifidobacterium adolescentis and application of nitrogen source

The invention discloses a nitrogen source suitable for efficient proliferation of bifidobacterium adolescentis and application of the nitrogen source, and belongs to the technical field of microorganisms. According to the method, the optimal growth nitrogen source composition of bifidobacterium adolescentis is obtained firstly, then ultrafiltration freeze drying is adopted for preparing the specific nitrogen source of bifidobacterium adolescentis, and the nitrogen source is composed of molecular peptides with the molecular weight of 500-2000 Da. Bifidobacterium adolescentis is added into a culture system with the nitrogen source as the only nitrogen source, the utilization rate and growth rate of bifidobacterium adolescentis on the nitrogen source can be remarkably increased, and the viable count of bifidobacterium adolescentis in fermentation liquor is high; and the viable count of the bifidobacterium adolescentis utilizing the specific nitrogen source per unit mass is not less than 3.0 * 10 < 8 > CFU/mL and