Table 1.

The content of neutral sugars (% dry weight, w/w) in lignin fractions separated using ammonia hydrothermal system from dewaxed cotton stalk.

Sugars (%)	Lignin fractions a
	L1	L2	L3	L4	L5	MWL
Rhamnose	ND b	ND	0.02	0.01	0.03	0.09
Arabinose	ND	ND	0.02	0.01	0.05	0.09
Galactose	0.03	0.01	0.07	0.04	0.05	0.09
Glucose	1.18	1.21	0.70	0.36	0.83	2.04
Xylose	0.05	0.03	0.12	0.01	0.09	4.43
Mannose	0.03	ND	0.05	ND	ND	ND
Total	1.29	1.25	0.98	0.43	1.06	6.74

^aL₁, L₂, L₃, L₄, and L₅ represent the lignin fractions isolated based on ammonia hydrothermal treatment at different reaction time of 2, 4, 6, 8, and 10 h;

^bND = not detected.