Variations in the composition and structure of the lignins of oat (Avena sativa L.) straws according to variety and planting season.
Int J Biol Macromol
; 242(Pt 2): 124811, 2023 Jul 01.
Article
in En
| MEDLINE
| ID: mdl-37187416
ABSTRACT
The differences in the composition and structure of the lignins from straws of different oat (Avena sativa L.) varieties, planted in two seasons (winter and spring), were studied in detail by different analytical techniques such as pyrolysis coupled to gas chromatography-mass spectrometry (Py-GC/MS), two-dimensional nuclear magnetic resonance (2D-NMR), derivatization followed by reductive cleavage (DFRC), and gel permeation chromatography (GPC). Overall, the analyses revealed that oat straw lignins were enriched in guaiacyl (G; 50-56 %) and syringyl (S; 39-44 %) units, with relatively lower amounts of p-hydroxyphenyl (H; 4-6 %) units. The lignins also incorporated significant quantities of p-coumarates (8-14 % of total lignin units), which are acylating the γ-OH of the lignin side chains, and predominantly over the S units. Furthermore, oat straw lignins also incorporated considerable amounts of the flavone tricin (5-12 % of total lignin units). Interestingly, this study revealed that the lignin content and composition of the oat straws vary with genotype and planting season. Since p-coumarates and tricin are high-value aromatic compounds especially attractive from a biorefinery point of view, the information disclosed here is highly relevant to plant breeding programs aimed at developing functional foods and lignin modifications for improved biorefinery applications.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Avena
/
Lignin
Language:
En
Journal:
Int J Biol Macromol
Year:
2023
Document type:
Article