Abstract: A composition containing a lignocellulose derivative contains at least one of the group consisting of a compound containing lignin and a compound containing hemicellulose. The composition may further contain a cellulose derivative in which some or all of hydroxyl groups in cellulose are etherified with an alkyl group having 2 or more carbons. A method for producing the composition includes subjecting a biomass as a raw material containing lignocellulose to an alkali treatment in a solvent; alkylating the lignocellulose by adding an alkylating agent to the alkali-treated biomass as a raw material; and fractionating the alkylated biomass as a raw material. The alkylating agent is an alkyl halide having 2 or more carbons.

Abstract: A polymer compound or a salt thereof which comprises a biodegradable polymer such as polyglutamic acid acetylated at N-terminal thereof containing a glycosphingolipid such as lysoganglioside GM3, and which exerts antiviral activity against variety of viruses and is useful as an active ingredient of a medicament.