Table 1.

Average degree of polymerization (DP) and fraction of acetylation (F_A) of chitosans (Group I) without treatment (A) and thermally treated for 3 and 10 h (B and C) and chitosans (Group II) obtained by partial alkaline deacetylation of chitin (D and E) and chitosans (X₁ to X₆) generated by partial homogeneous de-N-acetylation of chitin (Group III) and chitosans (Y₁ to Y₄) obtained by partial re-N-acetylation of polyglucosamine (Group IV).

	Group I			Group II
Code	A	B	C	D	E
DP a	1,383	366	45	1,171	1,089
FA	0.22	0.23c	0.22	0.08	0.16

	Group III
Code	X1	X2	X3	X4	X5	X6
DP b	190	320	68	121	210	224
FA	0.01	0.15	0.35	0.49	0.60	0.69

	Group IV
Code	Y1	Y2	Y3	Y4
DP a	2,580	2,608	2,528	2,518
FA	0.10	0.29	0.40	0.50

^aDP_w (mass average molar mass)

^bDP_n (number average molar mass).

^cF_A determined by potentiometric titration. F_A of other samples were determined by high-field ¹H NMR (proton nuclear magnetic resonance spectroscopy)