| abstract |
(57) [Summary] [Structure] A modified hyaluronic acid having the structure of the following general formula 1, a method for producing the same, and an emulsifier. [Chemical 1] In the above chemical formula 1 , R 1 , R 2 , R 3 and R 4 mean hydrogen or ester-bonded acid residues, and the acid residues include hydrophilic acid residues and hydrophobic acid residues. There are at least two types. R 5 represents hydrogen or an alkali metal atom. [Effect] It can be used as an extremely excellent emulsifier. |