Sialyl lactose fermentation culture medium additive and application thereof in improving sialyl lactose production capacity of microorganisms

The invention relates to the technical field of microbial engineering, in particular to a sialic acid lactose fermentation culture medium additive and application thereof to improvement of sialic acid lactose production capacity of microorganisms. The sialic acid lactose fermentation culture medium additive comprises one or more of glutamine, aspartic acid or cytosine. According to the invention, glutamine, aspartic acid and cytosine are found to be capable of improving the ability of producing sialic acid lactose of the strain under a certain content; the three components are combined to obtain a fermentation culture medium additive, and the yield of sialic acid lactose produced by the strain can be remarkably improved by adding the fermentation culture medium additive combination into a fermentation culture medium of the strain for producing sialic acid lactose. The fermentation medium additive provided by the invention is suitable for various types of sialic acid lactose-producing strains, and has importan