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백색부후균인 Phanerochaete chrysosporium에 의한 리그닌 모델 화합물 분해
안세희,島田幹夫 대구대학교 과학기술연구소 1999 科學技術硏究 Vol.5 No.5
The degradation products were extracted with ethyl acetate and identified by NMR and GC-MS to elucidate degradation pathways of the lignin substructure model compounds. All degradation products were identified by GC-MS in comparison with mass spectra of synthetic authentic compounds. The results are classified to the cleavage of side chain and aromatic ring opening of the compounds. We found that lignin peroxidase of P. chrysosporium also catalyzes one electron oxidation of non-phenolic compounds in the initial degradation of lignin substructure model compounds. Lignin peroxidase catalyzes one electron oxidation of aromatic rings of non-phenolic aromatic compounds to give unstable cation radical which undergo spontaneous transformation. The Cα-Cβ 13 bond of the propyl side chain is homolytically cleaved via an aryl cation radical of the substrate to give benzyl cation, and guaiacoxyethyl radical which is attacked by dioxygen to form an unstable hemiketal. The O-Cβ bond of hemiketal is subsequently cleaved to give vanillin and benzaldehyde. The aromatic ring opening products were also identified as lignin peroxidase degradation products of β-O-4 model compound.