Table 1.

The composition of hydrogels and gelation time.

Sample	NH2/CHO Ratio	Chitosan (mg)	P5P (mg)	Water Volume (mL)	Water Content (%)	Solid Content (%)	Gelation Time
1	1:1	60	79.7	4	96.63	3.37	i
1d	1:1	60	79.7	8	98.28	1.72	i
1t	1:1	60	79.7	12	98.85	1.15	i
1q	1:1	60	79.7	16	99.13	0.87	5′
1.5	1.5:1	60	53.2	4	97.25	2.75	i
1.5d	1.5:1	60	53.2	8	98.60	1.40	i
1.5t	1.5:1	60	53.2	12	99.07	0.93	i
1.5q	1.5:1	60	53.2	16	99.30	0.70	30′
2	2:1	60	39.8	4	97.57	2.43	i
2d	2:1	60	39.8	8	98.77	1.23	i
2t	2:1	60	39.8	12	99.18	0.82	5′
2q	2:1	60	39.8	16	99.38	0.62	24 h
2.5	2.5:1	60	31.8	4	97.76	2.24	i
2.5d	2.5:1	60	31.8	8	98.87	1.13	5′
2.5t	2.5:1	60	31.8	12	99.24	0.76	24 h
2.5q	2.5:1	60	31.8	16	99.43	0.57	-
3	3:1	60	26.6	4	97.88	2.12	i
3d	3:1	60	26.6	8	98.93	1.07	30′
3t	3:1	60	26.6	12	99.28	0.72	24 h
3q	3;1	60	26.6	16	99.46	0.54	-
3.5	3.5:1	60	22.8	4	97.97	2.03	i
3.5t	3.5:1	60	22.8	12	99.31	0.69	24 h
3.5q	3.5:1	60	22.8	16	99.49	0.51	-
4	4:1	60	19.9	4	98.04	1.96	i
4d	4:1	60	19.9	8	99.01	0.99	30′
4t	4:1	60	19.9	12	99.34	0.66	24 h
4q	4:1	60	19.9	16	99.50	0.50	-
4.5	4.5:1	60	17.7	4	98.09	1.91	i
4.5t	4.5:1	60	17.7	12	99.36	0.64	-
5	5:1	60	15.9	4	98.14	1.86	i
5d	5:1	60	15.9	8	99.06	0.94	24 h
6	6:1	60	13.3	4	98.20	1.80	5′
7	7:1	60	11.4	4	98.25	1.75	30′
8	8:1	60	10.0	4	98.28	1.72	5 h
9	9:1	60	8.9	4	98.31	1.69	24 h

i—instantaneous gelation; -—no hydrogel formation.