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Structural characterization of stalk lignin from banana plant
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Orientador(es)
Resumo(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.
Descrição
Palavras-chave
Lignin Musa acuminata Colla var. Cavendish Rachis Floral stalk Banana plant 13C NMR 1H NMR . Faculdade de Ciências Exatas e da Engenharia
Contexto Educativo
Citação
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.
Editora
Elsevier