NDLI: Delignification of cell walls of Chamaecyparis obtusa during alkaline nitrobenzene oxidation

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Delignification of cell walls of Chamaecyparis obtusa during alkaline nitrobenzene oxidation

Content Provider	Springer Nature Link
Author	Yoshinaga, Arata Oh, Seizo Fujita, Miru
Copyright Year	2004
Abstract	To clarify the behavior of whole lignins in wood cell walls during alkaline nitrobenzene oxidation, the delignification process from cell walls in normal and compression woods of Chamaecyparis obtusa Endl. (Cupressaceae) was observed using ultraviolet and transmission electron microscopies. The lignin content conspicuously decreased to around 10% after 35 min in normal wood. The lignin content in compression wood finally leveled off at aroumd 10% after 50 min. In gel filtration of oxidation products in ethyl acetate, a high molecular weight fraction was prominent in extracts from the early stage of the reaction. As the oxidation progressed, the high molecular weight fraction became less prominent in both normal and compression wood. Changes in the weights of cell wall residues during reaction indicated that approximately half of the components other than lignin were also removed from the cell walls. This shows that the majority of lignin with relatively high molecular weight is removed from the cell walls together with polysaccharides in the early stage of the reaction and that further oxidative degradation occurs in solution in later stages. Only a small amount of the lignin with low molecular weight could be analyzed by gas chromatography.
Starting Page	287
Ending Page	294
Page Count	8
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	50
Issue Number	4
e-ISSN	16114663
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-08-25
Publisher Place	Tokyo
Access Restriction	Subscribed
Subject Keyword	Lignin distribution Alkaline nitrobenzene oxidation Ultraviolet microscopy Transmission electron microscopy Gel filtration
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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