Table 2.

Influence of deacetylation degree (DD) on physicochemical properties of chitosan in different forms.

Form	DD (%)	Properties	Results	Ref.
Films	82, 80–85, 100	Crystallinity, tensile strength, % elongation, swelling index	Crystallinity and tensile strength increased, while % elongation and swelling index decreased with increase in DD (highest MW)	[75]
Powder	76–92	Thermal degradation	Thermal stability decreased with increase in DD	[76]
Films	70–95	Crystallinity, tensile strength, % elongation, swelling index	Crystallinity and tensile strength increased with increase in DD, swelling index decreased with increase in DD; % elongation increased when the DD increased from 70% to 80% and decreased when the DD increased from 80% to 95%	[77]
Microspheres	48, 62, 75	Swelling index	Swelling index increased with increase in DD	[78]
Membranes	75, 87, 96	Crystallinity, swelling index, tensile strength, % elongation	87% DD presented lower crystallinity and mechanical properties, but higher swelling index than 75% or 96% DD	[79]
Nanofibers	59, 76, 85	Thermal degradation	Thermal stability decreased with increase in DD	[80]
Films	15–70	Tensile strength, % elongation	Tensile strength, and % elongation increased with increase in DD	[81]
Sponge	58, 73, 82, 88, 91	Swelling index, tensile strength	Swelling index increased and tensile strength decreased with increase in DD	[82]
Films	72–85	Crystallinity, tensile strength, % elongation, degradation rate	Crystallinity increased and tensile strength decreased with increase in DD, % elongation decreased when the DD was increased from 72% to 75% and decreased when it increased from 75% to 85%. No difference in degradation rates	[83]
Beads	83,94,96	Tensile strength, thermal degradation	Tensile strength, thermal stability increased with increased in DD	[84]