Lignin is a superb renewable feedstock for deriving petroleum-analogous biochemicals and value-added bioproducts. However, proper elucidation of its original biosynthetic structure and subsequent deconstruction is necessary to facilitate proper exploitation. Herein, its chemical substructure and linkages within an important global feedstock, rice straw, were interrogated by spectroscopy. Pyrolysis was chosen to cleave it and obtain guaiacyl (G), syringyl (S), and hydroxyphenyl (H) monophenols distributions at various temperatures. A unique relationship between product substructures and lignin depolymerization was revealed. The overall scope of the depolymerization mechanism into monophenols by cleavage of β-O-4 and β-5 in phenylcoumaran subunits were explored experimentally and through bond dissociation energy (BDE) theory.

中文翻译：

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稻草木质素亚基键断裂及其单酚形成机理的研究。

木质素是一种极好的可再生原料，用于衍生石油类生物化学物质和增值生物产品。但是，必须对其原始的生物合成结构进行适当的阐明并随后进行解构以促进适当的利用。在此，通过光谱法研究了其在重要的全球原料稻草中的化学亚结构和连接。选择热解来裂解它，并在不同温度下获得愈创木脂基（G），丁香基（S）和羟苯基（H）单酚分布。揭示了产物亚结构和木质素解聚之间的独特关系。通过键合解离能（BDE）理论实验性地探索了通过裂解苯酷马兰亚基中的β-O-4和β-5来解聚为单酚的解聚机理的整体范围。