【摘要】 人类对纤维素的开发与利用还非常有限,未能完全搞清天然纤维素的生物降解机制是其一个重要原因。自从C1—Cx假说提出以来,又有较多的降解理论出现对其改进,纤维素酶水解机制不能完全解释天然纤维素的降解,大量文献证实天然纤维素降解存在氧化机制。本文主要介绍水解与氧化机制中具代表性酶协同降解模型、纤维二糖水解酶(CBH)协同作用假说、羟基自由基的氧化机制和纤维二糖脱氢酶途径等不同降解理论,将水解和氧化两种机制结合起来给出其降解途径,也许能够较为容易理解纤维素的降解具体过程。更多还原

【Abstract】 The development and application of cellulose is limited because the mechanism of cellulose bio-degradation has not yet been clearly understood. Since hypothesis of C1—Cx was suggested, other theories of degradation were suggested to modify the former. It is obvious that enzymic hydrolysis mechanism of cellulose alone could not explain degradation of natural cellulose completely. In this article, representative enzymatic synergisms, hypothesis of cellobiohydrolase(CBH) synergism, HO· radical oxidation and cellobioes dehydrogenase have been mainly introduced. The pathway of cellulose degradation could be better understood through combination of hydrolysis mechanism and oxidation mechanism.更多还原