中文摘要：

利用气相色谱-质谱联用（GC—MS）方法对GIF仿酶漂白中的木质素降解产物进行了分析，进一步探讨这种仿酶系统对木质素的降解机制。结果显示GIF仿酶处理使竹浆残余木质素进一步氧化降解，降解的主要方式有脱甲基作用、醌型结构的产生和开环、烷基一芳基醚键的开裂、侧链碳-碳连接的氧化断裂等。GC—MS检测所得的降解产物中，含羰基的化合物较多，这是GIF仿酶系统催化氧化的结果。一些醌式结构、共轭羰基和酚类的脱除，也使纸浆因发色基团减少而白度提高。此外，检测出一些糖类降解产物，说明GIF仿酶系统对纸浆碳水化舍物有一定的降解作用。

英文摘要：

The degraded products of lignin were identified by gas chromatography-mass spectrometry （GC-MS） during GIF biomi- metic bleaching of bamboo pulp to explore lignin degradation mechanism. The results showed that residual lignin was further degraded by GIF biomimetic system. The main ways of lignin degradation were involved with demethylation, formation and opening of quinone-type structures, cleavages of alkyl-aryl ether bond and carbon-carbon linkage in side-chain. The degraded products contained much carbonyl compounds, which was the result of catalytic oxidation in GIF biomimetic system. The pulp brightness was improved because of the removals of some quinone-type structures, conjugated carbonyl and phenolic compounds. Some carbohydrate-degraded products were also detected out by GC-MS.