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ITS » Scientific Articles » Luar ITS Posted by email@example.com at 19/12/2014 21:50:31 • 800 Views
REACTIVITY OF LONG CHAIN ALKYLAMINES TO LIGNIN MOIETIES IMPLICATIONS ON HYDROPHOBICITY OF LIGNOCELLULOSE MATERIALS
Author : KUDANGA, TUKAYI; PRASETYO, ENDRY NUGROHO ( none; 197310142000121001 ) SIPILA, JUSSI; GUEBITZ, GEORG MNYANHONGO, GIBSON S
Enzymatic processes provide new perspectives for modification of lignocellulose materials. In the current study laccase catalyzed coupling of long chain alkylamines to lignin model molecules and lignocellulose was investigated. Up to two molecules of dodecylamine DA and dihexylamine DHA were successfully coupled with lignin monomers guaiacol catechol and ferulic acid while coupling onto complex lignin model compounds syringylglycerol 946-guaiacyl ether guaiacylglycerol 946-guaiacyl ether and dibenzodioxocin yielded 11 coupling products. Surface analysis of beech veneers enzymatically grafted with DA showed an increase in nitrogen content of 3.18 compared to 0.71 in laccase only treated controls while the O C ratio decreased from 0.52 to 0.46. Concomitantly the grafting of DHA or DA onto beech veneers resulted in a 53.8 and 84.2 increase in hydrophobicity respectively when compared to simple adsorption. Therefore laccase-mediated grafting of long chain alkylamines onto lignocellulose materials can be potentially exploited for improving their hydrophobicity.