I am trying to create a solution of Chitosan (Low MW) in 1% Acetic acid. I ve tried dissolving up to 3gr per 100ml (Literature reports solutions up to 10% wt.) My problem is that by using extensive sonication and stirring for days the solution is still very thick (very viscous) and you can see particles in it. If I use heating (~70 C for a day) I can get a cleaner (less viscous) solution but strangely the colour changes from light yellow to dark orange. Do i induce somekind of crosslinking that way? Whats the safe way to dissolve Chitosan?