Variability in Lignin Composition and Structure in
Cell Walls of Different Parts of Macaúba (Acrocomia
aculeata) Palm Fruit
Version 2 2018-02-22, 05:29
Version 1 2017-12-22, 20:15
Posted on 2018-02-22 - 05:29
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.
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Rencoret, Jorge; Kim, Hoon; Evaristo, Anderson B.; Gutiérrez, Ana; Ralph, John; C. del Río, José (2017). Variability in Lignin Composition and Structure in
Cell Walls of Different Parts of Macaúba (Acrocomia
aculeata) Palm Fruit. ACS Publications. Collection. https://doi.org/10.1021/acs.jafc.7b04638
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AUTHORS (6)
JR
Jorge Rencoret
HK
Hoon Kim
AE
Anderson B. Evaristo
AG
Ana Gutiérrez
JR
John Ralph
JC
José C. del Río