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Hong, P., Luo, Q., Ruan, R., Zhang, J., and Liu, Y. (2014). "Structural features of lignin and lignin-carbohydrate complexes from bamboo (Phyllostachys pubescens Mazel)," BioRes. 9(1), 1276-1289.


Understanding the structural features of lignin (L) and lignin-carbohydrate complexes (LCC) in bamboo (Phyllostachys pubescens Mazel) is important in order to expand the use of bamboo biomass. In this study, L and LCC were isolated from four-year-old mature bamboo using an organic solvent as an extractant. The structural features of L and LCC were characterized via UV-vis, FT-IR, NMR, sugar composition analysis, and alkaline nitrobenzene oxidation. L and LCC contained almost the same structural units: guaiacyl (G), syringyl (S), p-hydroxybenzoate substructures (PB),β-O-4’ substructures (A), 3-O-acetyl-(1→4)-linked- β-d-xylopyranosyl (βXyl3), (1→4)-linked-α(β)-d-xylopyranosyl (α(β)Xyl), and 4-O-methyl-α-d-glucuronic acid (MeGlcA(1→4)). The contents of the units varied between L and LCC. Carbohydrates linked with lignin in L and LCC mainly consisted of xylans. The sugar units of carbohydrates linked with lignin in LCC were determined to be of xylose (76.98%), arabinose (4.08%), glucose (6.47%), mannose (6.34%), altrose (3.69%), galactose (1.75%), and ribose (0.69%). The S (75.80%) and G (24.20%) units with a high S/G ratio of 3.13 were the main structural elements of lignin associated with carbohydrates in LCC.
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