Disclosed is hylan, a chemically modified hyaluronan preparation characterized by the presence of small amounts (0.0002-0.05% by weight) of aldehyde cross-linking groups covalently bonded to the hyaluronan molecular chains. Also disclosed is an improved method of obtaining hylan comprising treating hyaluronan...http://www.google.com/patents/US5099013?utm_source=gb-gplus-sharePatent US5099013 - Hylan preparation and method of recovery thereof from animal tissues
