What is claimed is:
1. A derivative of an insoluble biopolymer, wherein said biopolymer contains reactive amine or carboxyl groups, characterized in that said derivative is modified with a modifier molecule with the formation of a peptide bond.
FIELD OF THE INVENTION
The invention relates to a method for synthesis of a biopolymer derivative, preferably a chitosan derivative, comprising formation of a peptide bond, a biopolymer derivative, and use of a biopolymer derivative, preferably a chitosan derivative. The invention relates also to cosmetic compositions containing a new chitosan derivative and to the...