Organization Behavior of Guaiacyl and Guaiacyl/Syringyl Dehydrogenation Polymers (Lignin Model Compounds) at the Air/Water Interface

In plant cell walls, lignins are closely associated with hydrophilic polysaccharides. In these associations, the interface between the two polymers may have a strong influence on the molecular architecture of plant cell walls. To model such hydrophilic/hydrophobic and anisotropic media, two DHPs (de...

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Bibliographic Details
Published in:Langmuir 2000-12, Vol.16 (26), p.10444-10448
Main Authors: Cathala, B, Lee, L. T, Aguié-Béghin, V, Douillard, R, Monties, B
Format: Article
Language:English
Subjects:
Biochemistry
Biochemistry, Molecular Biology
Life Sciences
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Summary:In plant cell walls, lignins are closely associated with hydrophilic polysaccharides. In these associations, the interface between the two polymers may have a strong influence on the molecular architecture of plant cell walls. To model such hydrophilic/hydrophobic and anisotropic media, two DHPs (dehydrogenation polymer models of lignins, one guaiacyl type (G) and one mixed guaiacyl/syringyl type (GS)) were spread at the air/water interface. The investigation of these two DHP layers at the air/water interface by neutron reflectivity has demonstrated that both DHPs form a nonhomogeneous structure with DHP distribution going from a concentrate structure at the air side to a dilute one at the water side. When the amount of spread polymer is increased, the GS DHP layer shows a regular increase of the DHP volume fraction whereas the G DHP forms steeper density profile structures, implying that molecular structural differences might be involved in these different behaviors.
ISSN:0743-7463
1520-5827
DOI:10.1021/la000939y