Chitosan Hydrogel preparation

[Frank]

Hi

Has anyone here used hydrogels such as chitosan as injectable scaffold or vehicle? I need to prepare an injectable chitosan gel loaded with PRP. The purpose is to keep the platelets in place longer that they would remain if injected as PRP alone.

Do I have to make the chitosan gel myself from crystalized chitosan (which would be a deal breaker) or can I get a ready to go gel? Is hyaluronic acid gel (as an alternative) significantly less porous than the chitosan?

thank you