Structural characterization of stalk lignin from banana plant

Oliveira, L.; Evtuguin, D.; Cordeiro, N.; Silvestre, A.J.D.

http://hdl.handle.net/10400.13/3358

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Abstract(s)

Dioxane lignins from two fractions of banana plant ‘Dwarf Cavendish’ stalk (floral stalk (DLFS) and rachis (DLR)) were structurally characterized by a set of spectroscopic (Ultravio let (UV), FTIR, solid- and liquid-state NMR) and chemical degradation (permanganate (PO) and nitrobenzene oxidation (NO)) techniques. Despite both lignins are of HGS-type, strong structural differences were observed between them. Thus, DLFS showed almost twice the abundance of H and G units and almost half of the abundance of S units when compared to DLR. DLR possessed significantly higher amount of -O-4 structures (0.32/C6 against 0.12/C6) and the molecular weight (5400 Da against 3750 Da) than those of DLFS. About 72% of the con densed structures in DLFS are of -5 and 5–5 types, whereas 4-O-5 -diaryl ether structures were the most abundant condensed structures in DLR. Most of H units in both lignins are terminal phenolic coumarates linked to lignin substructures by ester bonds. Both lignins are structurally associated with suberin-like components in cell wall tissues. Structural fea tures of stalk lignin were discussed in terms of possible restrictions for the kraft pulping of integral stem material.

Keywords

Lignin Musa acuminata Colla var. Cavendish Rachis Floral stalk Banana plant 13C NMR 1H NMR . Faculdade de Ciências Exatas e da Engenharia

URI

http://hdl.handle.net/10400.13/3358

Citation

Oliveira, L., Evtuguin, D., Cordeiro, N., & Silvestre, A. J. D. (2009). Structural characterization of stalk lignin from banana plant. Industrial crops and products, 29(1), 86-95.