Abstract:
:Coniferyl alcohol was polymerized in pectin solution in order to mimic the lignification that is the final step of biosynthesis of plant cell wall. Dehydrogenated polymers (DHP = coniferyl alcohol polymers = synthetic lignin) interact with pectin to form hydrophobic clusters as monitored by pyrene fluorescence spectroscopy. The structure of these clusters was studied during the polymerization of synthetic lignin by static and quasielastic light scattering and small angle neutron scattering experiments. We show that synthetic lignin and pectin contribute to the same clusters, but the inner structure of these clusters is very heterogeneous and displays three phases. One observes a segregation between well separated pectin and lignin rich phases at length scales below approximately 30 nm. As a corollary of this segregation, clusters embody a large amount of solvent. On average, the density of the polymer rich phase (lignin plus pectin) inside clusters increases while its specific surface area decreases throughout the polymerization process. These results are discussed with respect to in vivo lignification of the plant cell wall.
journal_name
Biomacromoleculesjournal_title
Biomacromoleculesauthors
Lairez D,Cathala B,Monties B,Bedos-Belval F,Duran H,Gorrichon Ldoi
10.1021/bm049390ykeywords:
subject
Has Abstractpub_date
2005-03-01 00:00:00pages
763-74issue
2eissn
1525-7797issn
1526-4602journal_volume
6pub_type
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