Physicochemical Characterization of Thermally Treated Chitosans and Chitosans Obtained by Alkaline Deacetylation

Table 4

Average molar mass (Mw), degree of polymerization, kinematic and apparent viscosties and viscosity average molar mass (Mv) of chitosans obtained by thermal treatment and alkaline deacetylation.

Code	GPC^1; Mw (g mol^−1)	DP^2	Apparent viscosity^3 (mPa·s)	Kinematic viscosity^4 (cSt)	Intrinsic viscosity^5; Mv (g mol^−1)
A	235,000	1,383	29.9	13.9	193,400
B	62,500	366	2.3	1.9	93,594
C	7,700	45	1.4	1.2	10,978
D	193,000	1,171	4.9	5.1	30,219
E	184,000	1,089	4.7	5.2	91,203

1Gel permeation chromatography. ²Degree of polymerization [DP = Mw/(203 ×  𝐹_A + 161 × (1 − 𝐹_A))]. ³Brookfield rheometer. ⁴Cannon-Fenske no. 200 viscometer. ⁵Ubbelohde type 53110/I Schott GmbH viscometer.