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Table 1 Relative distribution (%) of area under the curve of the chemical shift in the 13C-CPMAS-NMR spectra of LRC and three HA obtained through CSB activity in comparison to HA obtained through alkaline extraction with NaOH

From: Effect of low-rank coal inoculated with coal solubilizing bacteria on edaphic materials used in post-coal-mining land reclamation: a greenhouse trial

HA-sample

C. carboxylic

C. phenolic

C. aromatic

C in carbohydrates and Di-O alkyl

C. N-alkyl methoxy

C. aliphatic

Aromaticity index

HA-CSB A. baumannii

17.37

5.72

35.51

11.10

7.55

22.74

0.41

HA-CSB B. mycoides

17.98

5.80

36.23

10.20

7.58

22.22

0.42

HA-CSB Microbacterium sp

17.37

6.86

41.67

10.71

5.90

17.49

0.49

AH-NaOH

18.27

10.64

48.71

6.75

3.93

11.69

0.59

LRC

11.83

8.14

48.06

8.55

3.05

20.37

0.56