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Title
Chemical and spectral characteristics of annual plant lignins modified by hydroxymetylation reaction
Authors
ADINA-MIRELA CAPRARU ELENA UNGUREANU LUCIA CARMEN TRINCA TEODOR MALUTAN and VALENTIN I. POPA
Received
May 30, 2011
Published
Volume 46, Issue 9-10 November-December
Keywords
lignin, hydroxymethylation, FT-IR, 1 H NMR, HPSEC
Abstract
This paper aims at the synthesis and chemical and spectral characterization of lignins from annual plants (L1 – lignin
from wheat straw, and L2 – lignin from grass), modified by hydroxymethylation with formaldehyde in alkaline
environment. The derivatives synthesized by this reaction were characterized by the introduced functional groups,
which has been related to the consumption of formaldehyde under different conditions. Subsequently, additional
information on the changes has been obtained by spectral studies (FTIR, 1 H NMR) and high performance steric exclusion chromatography (HPSEC). Studies have rev ealed some functional changes, related to both different reactivity
of lignins and reaction conditions.
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