Acidic polysaccharide esters containing carboxylic groups are useful for protecting against and curing ulcers of the gastro-enteric system. These esters include choline esters with acidic polysaccharide selected from the group consisting of hyaluronic acid, alginic acid, gellan, oxidized cellulose, oxidized chitin, carboxy-hydrocarbyl-cellulose, carboxy-hydrocarbyl-starch and carboxy-hydrocarbyl-chitin, wherein the term hydrocarbyl means the residue of a hydrocarbon selected from the group consisting of by alkyl, aralkyl and cycloalkyl.
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