3.3.3. Chemical demineralization
In the recovery of chitin from shrimp waste, associated min-erals should be removed as a second stage. As a consequence,shrimp waste deproteinized by enzymatic treatment was sub-jected to mild acid treatment in order to remove minerals.Residual minerals were then determined and results showedthat obtained samples contained 0.89 ± 0.1% minerals on driedmaterial basis (Table 3).