Hydroxyl Groups SKL(mmol/g) DL (mmol/g)
Carboxylic Acid 1.28 2.44
Guaiacyl-OH 0.96 1.32
Syringyl-OH 0.01 0.03
Aliphatic-OH 0.69 0.82
p-Hydroxyphenyl-OH 0.12 0.4
Table 4: Quantification of different hydroxyl groups of SKL and DL by 31P-NMR spectrometry.