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. 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.