Hyaluronic Acid is labeled with epoxide. Purity: >95% lyophilized powder. Degree of substitution (DoS): 5 mol % substitution. Other epoxide labeling ratio such as 15% can be ordered through custom synthesis.
The epoxide substitution or labeling ratio is the percentage of HA disaccharide monomers that are functionalized with epoxide groups. You may calculate the number of epoxide by 1) dividing the MW of HA by the MW of one disaccharide monomer to derive the number of disaccharide monomers in HA; 2) then multiple the number of disaccharide monomers by the labeling ratio to get the number of epoxide in each HA polymer.