Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 66, Issue 1, Pages 138-153Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.7b04638
Keywords
stalk; epicarp; endocarp; stilbenes; piceatannol; P gamma-GC/MS; 2D-NMR; DFRC
Funding
- Spanish Projects [AGL2014-53730-R, CTQ2014-60764-JIN, AGL2017-83036-R]
- FEDER
- CSIC [2014-40E-097]
- DOE Great Lakes Bioenergy Research Center (DOE BER Office of Science) [DE-FC02-07ER64494]
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The lignins from different anatomical parts of macauba (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 beta-ether linkages (84% of the total) and was partially acylated at the gamma-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 beta-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 beta-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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