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Chitin is the second most abundant biopolymer worldwide and is found ina large variety of animals. Besides shrimps, other species possess significantchitin contents in their external non-edible fraction, thus allowing them tobe also economically viable sources of this macromolecule. According tomass-loss evaluation of crab residues, 78.4% of the mass is comprised ofCaCO3 and 21.6% associated to the organic phase. The chitin content foundwas 8.0% of the residue’s initial mass and after the deacetylation step, theaverage chitosan yield was 5.0% of the initial residue mass. The thermaldecomposition profiles of obtained chitin and chitosan samples werecharacteristic of biopolymers, exhibiting non-oxidative (190–360°C) andoxidative (340–670°C) events of mass loss. Vibrational spectroscopic analysisshowed that the degrees of deacetylation of the obtained chitosan sampleswere time-dependent and between 68.4 and 81.9%.

Extraction and characterization of biopolymers from exoskeleton residues of the amazon crab Dilocarcinus pagei