Molecular variability of lignin fractions isolated from wheat straw

Autor: E. Billa, B. Monties
Přispěvatelé: ProdInra, Migration, Institut National de la Recherche Agronomique (INRA)
Rok vydání: 1995
Předmět:
Zdroj: Research on Chemical Intermediates
Research on Chemical Intermediates, Springer Verlag, 1995, 21 (3-5), pp.303-311
ISSN: 1568-5675
0922-6168
DOI: 10.1007/bf03052260
Popis: Three lignin fractions were isolated from wheat straw internodes and leaves: alkali lignin (LA), milled lignin (LM) and enzyme lignin (LE). Thioacidolysis and alkaline nitrobenzene oxidation were used for the characterisation of the lignin monomeric composition. Esterified and etherifiedp-coumaric and ferulic acids were characterised by alkali hydrolysis and acidolysis, respectively. Lignin fractions from leaves are more condensed than those from internodes. The syringyl/guaiacyl (S/G) ratio is higher in the case of internode lignins. Among the three lignin fractions, LA is the less condensed whereas LM and LE do not present significant structural differences according to their monomeric composition. Finally, the lignin fractions studied differ in their contents and proportions of associated phenolic acids.
Databáze: OpenAIRE
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