| http://www.w3.org/ns/prov#value | - A chitosan derivative consisting of a natural or partially digested chitosan, said chitosan derivative bearing one or more units of the compound of claim 1 wherein R2 is a hydrogen or acetyl and R3 is phenyl or tButyloxy and wherein R is CO (CH2) nCOX in which n is 2 to 14 and X is a bond attaching the compound of claim 1 to a nitrogen of said chitosan and Ri is CO (CH2) nCO X in which n is 2 to 1
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