| http://www.w3.org/ns/prov#value | - Polyanionic polysaccharide water-insoluble gels, films, and foams are prepared generally by dissolving at least one polyanionic polysaccharide (e.g., HA, CMC, CMA), in an aqueous mixture; activating the polyanionic polysaccharide with an activating agent such as a diimide, e.g. EDC or ETC; modifying the activated polyanionic polysaccharide with a modifying compound such as 1-hydroxybenzotriazole h
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