A supramolecular proposal of lignin structure and its relation with the wood properties

Anais da Academia Brasileira de Ciências

Heber S. Abreu¹  João V.f. Latorraca¹  Regina P.w. Pereira¹  Maria Beatriz O. Monteiro¹  Fábio A. Abreu¹  Kelysson F. Amparado¹ 

[1] ,Universidade Federal Rural do Rio de Janeiro Instituto de Florestas Departamento de Produtos FlorestaisSeropédica RJ ,Brasil

关键词: lignin;    molecular conformation;    wood properties;    structure;    lignina;    conformação molecular;    propriedades da madeira;    estrutura;   

DOI  :  10.1590/S0001-37652009000100014

来源: SciELO

【 摘 要 】

In spite of the great importance of cellulose the lignin is considered the second most abundant substance of the wood. However, little attention has been given it, mainly to wood properties. The lignin as well as other structural compounds (cellulose and hemicelluloses), has obviously an important role on the wood properties, probably due its composition and existent bonds. In general lignins have β-O-4 (Alkyl Aril Ether) as majoritary bond. This bond in a continued structure form big molecules with spiral conformation as virtual model. Based on this idea, lignins that have high/low β-O-4 content may have differentiated spiraled structures,suggesting different behaviors on the wood properties,which shows that the lignins (Guaicyl:Syringyl (GS)) of angiosperms, for example, which have higher β-O-4 content would present higher spiral conformation than gymnosperms lignins(HG). On the other hand HG lignins have chance of being more anchored on the matrix compound than GS lignins. In this context, the β-O-4 bonds of lignins possibly affect the wood properties, therefore, it is considered relevant for wood technology science discussion.

【 授权许可】

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