. 2016 Feb 26;6:22186. doi: 10.1038/srep22186

Table 2. The assignment of functional groups at different chemical-shift regions and their proportions in the total spectral area determined by ¹³C NMR.

Group	190–220 ppm	165–190 ppm	142–165 ppm	110–142 ppm	93–110 ppm	60–93 ppm	45–60 ppm	0–45 ppm
Assignment	ketones/aldehydes	COO/N–C = O	aromatic C–O	aromatic C–C + /H	alkyl O–C–O	O–alkyl	NCH/OCH₃	alkyl
L30	1.4 ± 0.2cd	6.2 ± 0.1d	3.9 ± 0.1d	9.4 ± 0.1c	9.8 ± 0.2a	42.8 ± 1.0a	8.4 ± 0.1d	18.2 ± 1.2a
M30	1.0 ± 0.1d	6.7 ± 0.1d	3.9 ± 0.0d	9.7 ± 0.1c	8.5 ± 0.1b	38.1 ± 0.1b	10.9 ± 0.1b	21.2 ± 0.1ab
H30	2.0 ± 0.4bc	8.7 ± 0.3c	5.5 ± 0.3c	11.9 ± 0.3b	7.9 ± 0.1b	30.7 ± 0.2c	11.9 ± 0.3a	21.5 ± 1.1ab
L120	2.9 ± 0.0ab	9.9 ± 0.1b	5.8 ± 0.1bc	11.7 ± 0.1b	7.3 ± 0.1c	31.1 ± 0.1c	9.8 ± 0.1c	21.5 ± 0.2a
M120	3.0 ± 0.1a	9.9 ± 0.1b	6.2 ± 0.0b	12.5 ± 0.1ab	7.0 ± 0.0d	30.2 ± 0.1c	9.9 ± 0.1c	21.2 ± 0.1ab
H120	3.0 ± 0.1ab	10.8 ± 0.2a	7.4 ± 0.1a	12.9 ± 0.2a	6.5 ± 0.0cd	24.8 ± 0.2d	11.7 ± 0.2a	23.0 ± 0.4a

L30: low temperature (15 °C) on day 30 (early stage of decomposition); M30: moderate temperature (25 °C) on day 30; H30: high temperature (35 °C) on day 30; L120: low temperature on day 120 (late stage of decomposition); M120: moderate temperature on day 120; H120: high temperature on day 120.

Table 2. The assignment of functional groups at different chemical-shift regions and their proportions in the total spectral area determined by 13C NMR.

Table 2. The assignment of functional groups at different chemical-shift regions and their proportions in the total spectral area determined by ¹³C NMR.