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Table 3 Lignin and carbohydrate composition of each fraction

From: Precipitate obtained following membrane separation of hydrothermally pretreated rice straw liquid revealed by 2D NMR to have high lignin content

 

Fraction No.

Acid-insoluble lignin %

Soluble lignin %

Glucan %

Xylan %

Ash %

Others %

Rice straw

1

19.5

6.5

31.9

12.8

10.0

19.3

Solid fraction

2

17.2

2.5

53.6

1.1

16.5

9.1

Brown precipitate

3

29.4

8.7

13.2

13.5

4.4

30.8

Supernatant

4

17.3

9.6

8.1

19.4

0.0

45.5

NF concentrate

5

17.0

11.2

9.6

24.6

0.0

37.6

Black precipitate

6

52.9

12.9

4.0

11.9

0.1

18.3

UF concentrate

7

24.5

16.7

5.6

29.0

0.0

24.2