In the recovery of chitin from shrimp waste, associated minerals
should be removed as a second stage. As a consequence, shrimp
waste deproteinized by enzymatic treatment was subjected to mild
acid treatment in order to remove minerals. The demineralization
was completely achieved within 6 h at 50 ◦C after treatment with
1.5 M HCl solution at a ratio of 1:10 (w/v).