Method for supplementing corn steep liquor in fermentation process of tetrahydromethylpyrimidine carboxylic acid

The invention relates to the technical field of production of amino acid derivatives, and provides a method for supplementing corn steep liquor in the fermentation process of tetrahydromethylpyrimidine carboxylic acid. The method for supplementing the corn steep liquor in the fermentation process of the tetrahydromethylpyrimidine carboxylic acid comprises the following steps: firstly, pretreating the corn steep liquor by adopting an alkaline method; detecting the accumulation amount of carotene; the method comprises the following steps: culturing streptococcus thermophilus in a culture medium taking corn steep liquor as a nitrogen source, performing L-lactic acid fermentation, and detecting and recording the content of the streptococcus thermophilus in a tank; and after supplementing the corn steep liquor, detecting and recording the content in the tank again. A control group and an experimental group are set during a corn steep liquor supplement experiment, the control group is normally fermented without any