Investigation of lignins structure in cereal crops by chemical degradation methods

 
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1998 (EN)
Investigation of lignins structure in cereal crops by chemical degradation methods (EN)

Billa, E (EN)
Koukios, EG (EN)
Monties, B (EN)

N/A (EN)

The monomeric composition of in situ lignins in sorghum, maize and wheat straw stems is investigated by two chemical degradation methods: thioacidolysis and alkaline nitrobenzene oxidation. It is shown that the structural information obtained in the case of lignin characterisation by alkaline nitrobenzene oxidation is strongly dependent on the reaction conditions, namely the temperature and the reaction time, as indicated by the significant variations in the yields of aromatic aldehydes that correspond to the three main constitutive lignin units, p-hydroxyphenyl (H), guaiacyl (G) and syringyl (S), Moreover, the complementary character of the two methods that stems from their different specificities is discussed in view of the molecular heterogeneity of lignins. Finally, the results obtained indicate a significant structural variability of the lignins of the three crops examined. (C) 1998 Elsevier Science Limited. All rights reserved. (EN)

journalArticle

Cereal crops (EN)
Lignin (EN)
Temperature (EN)
Alkaline nitrobenzene oxidation (EN)
Crops (EN)
Structure (composition) (EN)
Sorghum (EN)
Reaction Time (EN)
Thioacidolysis (EN)
Maize (EN)
Degradation (EN)
Benzene (EN)
Wheat straw (EN)
Wheat Straw (EN)
Oxidation (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Polymer Degradation and Stability (EN)

1998


ELSEVIER SCI LTD (EN)



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