Colominic acid sodium salt, also known as polysialic acid sodium salt, is naturally isolated from the cell wall of Escherichia coli and animals. It exhibits a red color with an absorption maximum of 530 nm and possesses anti-bacterial activity.

Colominic acid (Polysialic acid) is an form of N-glycosylation with great specificity for its limited central nervous system targets, including the cell adhesion molecules neural cell adhesion molecule (NCAM) and synaptic cell adhesion molecule 1 (SynCAM1), and the receptor, neuropilin-2[2].