 It was found that decreasing acetylation created an increase in compressive strength.Biodegradation was examined by use of lysozyme, which is known to be mainly responsible for degrading chitosan "in vivo" by hydrolyzing its glycosidic bonds and is released by phagocytic cells after nerve injury.The results reveal that there was an accelerated mass loss with intermediate DAs, compared with high and low DAs over the time period studied.