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Table 3 Crystalline and amorphous cellulose contents (measured by XRD) of samples obtained using various ammonia treatment conditions and aqueous NaOH treatment

From: Effects of alkaline or liquid-ammonia treatment on crystalline cellulose: changes in crystalline structure and effects on enzymatic digestibility

Cellulose samples

Treatment conditions

Amorphous content (%)

Cellulose allomorphs (CI, %)

Crystallite size (Ã…)

Cellulose conversion (%)

    

I

II

IIII

 

16 h

24 h

Avicel

Control

26

74

-

-

46

39

46

 

NaOH

25°C

47

-

53

-

37

66

76

 

NH3

25°C

46

-

-

54

38

49

59

  

130°C

26

-

-

74

55

36

49

α-cellulose

Control

42

58

-

-

40

41

48

 

NaOH

25°C

51

-

49

-

33

65

77

 

NH3

25°C

45

-

-

55

45

51

62

  

130°C

36

-

-

64

55

43

56

Cotton linters

Control

27

73

-

-

55

36

41

 

NaOH

25°C

56

-

44

-

40

67

78

 

NH3

25°C

48

-

-

52

57

43

52

  

130°C

24

-

-

76

68

42

53

Corn stover

Control

50

50

-

-

30

78

86

 

NaOH

25°C

56

-

44

-

34

79

87

 

NH3

25°C

49

-

-

51

54

76

85

  

130°C

32

-

-

68

56

55

67

  1. CI: crystallinity index; XRD: X-ray diffraction.