abstract |
Disclosed are a carboxymethyl group-containing modified hyaluronic acid and / or a salt thereof, and cosmetics, food compositions and pharmaceutical compositions containing the same. A carboxymethyl group-containing modified hyaluronic acid and / or a salt thereof has a molecular weight of 800,000 or more, and a carboxymethylation rate with respect to a disaccharide unit constituting hyaluronic acid is 5% or more and 200% or less, or The molecular weight is 4,000 or more and less than 800,000, and the carboxymethylation rate for the disaccharide unit constituting hyaluronic acid is 60% or more and 200% or less. [Selection figure] None |