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. 2017 Sep 7;9(9):428. doi: 10.3390/polym9090428

Table 3.

The 1H-NMR analysis of acetylated lignin.

Sample ID Chemical shift (ppm) 8.39 8.07 6.96 3.82 2.27 2.03
Proton arrangement graphic file with name polymers-09-00428-i001.jpg graphic file with name polymers-09-00428-i002.jpg graphic file with name polymers-09-00428-i003.jpg graphic file with name polymers-09-00428-i004.jpg graphic file with name polymers-09-00428-i005.jpg graphic file with name polymers-09-00428-i006.jpg
DL-1 Integral area of chemical shifts 1.23 1.29 0.74 4.91 1.65 2.21
Integral area of one proton in each functional group 0.63 0.74 1.64 0.55 0.74
Relative integral area of proton 1.00 1.17 2.60 0.87 1.17
Molar amount of functional groups in 1 g acetylated lignin (m mol/g) 0.66 0.78 1.72 0.58 0.78
Molar amount of functional groups in 1 g lignin (m mol/g) 0.70 0.82 1.82 0.61 0.82
DL-Y1 Integral area of chemical shifts 1.68 1.72 0.78 3.89 2.93 3.68
Integral area of one proton in each functional group 0.85 0.78 1.3 0.98 1.23
Relative integral area of proton 1.00 0.92 1.53 1.15 1.45
Molar amount of functional groups in 1 g acetylated lignin (m mol/g) 0.66 0.61 1.01 0.76 0.96
Molar amount of functional groups in 1 g lignin (m mol/g) 0.71 0.65 1.09 0.82 1.03
Lignin Integral area of chemical shifts 1.52 1.64 0.73 9.65 1.92 1.28
Integral area of one proton in each functional group 0.79 0.73 2.22 0.64 0.43
Relative integral area of proton 1.00 0.92 2.81 0.81 0.54
Molar amount of functional groups in 1 g acetylated lignin (m mol/g) 0.66 0.61 1.85 0.53 0.36
Molar amount of functional groups in 1 g lignin (m mol/g) 0.69 0.63 1.93 0.56 0.37

Note: Assume that the total mass of acetylated lignin is 1.0 g, then the acetylated lignin containing lignin; MDL-1 = 1 − (0.58 + 0.78) × 10 − 3 × 42 = 0.943; MDL-Y1 = 1 − (0.76 + 0.96) × 10 − 3 × 42 = 0.928; MLignin = 1 − (0.53 + 0.36) × 10 − 3 × 42 = 0.962.