Variability in Lignin Composition and Structure in Cell Walls of Different Parts of Macaúba (Acrocomia aculeata) Palm Fruit

The lignins from different anatomical parts of macaúba (Acrocomia aculeata) palm fruit, namely stalks, epicarp, and endocarp, were studied. The lignin from stalks was enriched in S-lignin units (S/G 1.2) and β-ether linkages (84% of the total) and was partially acylated at the γ-OH of the lignin sid...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2018-01, Vol.66 (1), p.138-153
Main Authors: Rencoret, Jorge, Kim, Hoon, Evaristo, Anderson B, Gutiérrez, Ana, Ralph, John, Del Río, José C
Format: Article
Language:English
Subjects:
2D-NMR
BASIC BIOLOGICAL SCIENCES
DFRC
endocarp
epicarp
piceatannol
Py-GC/MS
stalk
stilbenes
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Summary:The lignins from different anatomical parts of macaúba (Acrocomia aculeata) palm fruit, namely stalks, epicarp, and endocarp, were studied. The lignin from stalks was enriched in S-lignin units (S/G 1.2) and β-ether linkages (84% of the total) and was partially acylated at the γ-OH of the lignin side-chains (26% lignin acylation), predominantly with p-hydroxybenzoates and acetates. The epicarp lignin was highly enriched in G-lignin units (S/G 0.2) and consequently depleted in β-ethers (65%) and enriched in condensed structures such as phenylcoumarans (24%) and dibenzodioxocins (3%). The endocarp lignin was strikingly different from the rest and presented large amounts of piceatannol units incorporated into the polymer. This resulted in a lignin polymer depleted in β-ethers but enriched in condensed structures and linked piceatannol moieties. The incorporation of piceatannol into the lignin polymer seems to have a role in seed protection.
ISSN:0021-8561
1520-5118
DOI:10.1021/acs.jafc.7b04638