Production of a hyaluronic acid gel, which comprises keeping hyaluronic acid in water at a hyaluronic acid concentration of at least 5 wt % in the presence of an acid component in an amount at least equimolar with the carboxyl groups in the hyaluronic acid....http://www.google.ca/patents/US7014860?utm_source=gb-gplus-sharePatent US7014860 - Hyaluronic acid gel, process for producing the same, and medical material containing the same
