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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