Isolation ; characterization and valorization of hemicelluloses from Aristida pungens leaves as biomaterial

Lahouari Chaa (1, 1) , Nicolas Joly (2) , Vincent Lequart , Céline Faugeron (3) , Jean-Claude Mollet (1, 4) , Patrick Martin (2) , Henri Morvan (1)

1 LBHE - Laboratoire de Physiopathologie de la Barrière Hémato-Encéphalique
2 UCCS - Unité de Catalyse et Chimie du Solide - UMR 8181
3 LCSN - Laboratoire de Chimie des Substances Naturelles
4 GTCV - Glycobiologie et transports chez les végétaux

Aristida pungens, a perennial grass widely distributed on the Algerian arid regions, may potentially be the source of raw cell wall material to promote a local development in North Africa. Hemicelluloses, the main matrix cell wall polymers of this species were isolated from leaves with 14% KOH aqueous solution, characterized and converted as plastic material. The extraction procedure yielded two hemicellulose fractions (A and B) accounting for 3.5 and 10.1% of the starting leaf material, respectively. GC and13C NMR showed the presence of xylose as the main component with arabinosyl residues. Both analyses indicate that hemicelluloses from A. pungens leaves are arabinoxylans. Arabinoxylans were transformed into hydrophobic plastics by grafting of lauroyl chloride. The resulting materials were characterized by FT-IR and1H NMR spectroscopies, with both mechanical and thermogravimetric analysis.

Mots clés: Plastic films; Aristida pungens; Hemicelluloses; Arabinoxylan

Domaines: Chimie organique

Lahouari Chaa, Nicolas Joly, Vincent Lequart, Céline Faugeron, Jean-Claude Mollet, et al.. Isolation ; characterization and valorization of hemicelluloses from Aristida pungens leaves as biomaterial. Carbohydrate Polymers, 2008, 74 (3), pp.597-602. ⟨10.1016/j.carbpol.2008.04.017⟩. ⟨hal-00687060⟩