Degradation of benzyl ether bonds of lignin by ruminal microbes |
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Authors: | Kajikawa H Kudo H Kondo T Jodai K Honda Y Kuwahara M Watanabe T |
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Institution: | National Institute of Animal Industry, Tsukuba Norindanchi, Ibaraki, Japan. |
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Abstract: | We examined microbial activity in the rumen to cleave benzyl ether bonds of lignin model compounds that fluoresced when the bonds were cleaved. 4-Methylumbelliferone veratryl ether dimer was degraded completely within 8 h even in the presence of fungicidal antibiotics, but no significant degradation occurred with bactericidal antibiotics. Degradation of a phenolic beta-O-4 trimer incorporating 4-methylumbelliferone by a benzyl ether linkage was stimulated by ruminal microbes, although its corresponding non-phenolic model compound, 1-(4-ethoxy-3-methoxyphenyl)-1-O-(4-methylumbelliferyl)-2-(2-methoxyp henoxy)-3-propanol, was not degraded. A coniferyl dehydrogenation polymer bearing fluorescent beta-O-4 benzyl ether that contains both phenolic and non-phenolic benzyl ether bonds was partially degraded (about 20%) in 48 h. These results suggest that ruminal microbes decompose benzyl ether linkages of lignin polymers under anaerobic conditions. |
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Keywords: | Rumen microorganism Anaerobic degradation Lignin Lignin–carbohydrate complex Phenolic acid |
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