Chitosan from shrimp residues with a saturated solution of calcium chloride in methanol and water.

Calcium chloride, methanol, and water in stoichiometric amounts were used for the extraction of chitosan from shrimp residues (Farfantepenaeus aztecus). Chitosan was characterized by FT-IR, TGA, XRD, SEM, elemental analysis, and C-NMR. The yield of chitosan with medium molecular mass was 65.