Identifying the characteristic secondary ions of lignin polymer using ToF-SIMS
Identifying the characteristic secondary ions of lignin polymer using ToF-SIMS
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DOI：
10.1021/bm049521v
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发表时间：
2005-03-01
影响因子：
6.2
通讯作者：
Fukushima, K
中科院分区：
文献类型：
--
作者：
Saito, K;Kato, T;Fukushima, K
采用飞行时间二次离子质谱（ToF-SIMS）研究了木质素的化学结构。从松木和山毛榉木中分离的木质素的正ToF-SIMS光谱显示具有愈创木基（m/z 137和151）或双辛基（m/z 167和181）环的突出的二次离子，这是木质素聚合物的基本结构单元。这表明ToF-SIMS是木质素结构分析的有用工具。m/z 137和167处的峰被指定为C-6-C-1离子，m/z 151和181处的峰可能是双组分，C-6-C-1离子和C-6-C-2离子。我们证实了使用合成的木质素模型化合物，脱氢聚合物（DHP），这是由未标记和氘标记的松柏醇聚合形成的特征愈创木基离子。通过对松柏醇分子中的特定位置进行稳定同位素标记，推测了主要二次离子的形成机理，研究了二次离子形成与化学结构的关系。
The chemical structure of lignin, a complex, irregular polymer of phenylpropane units that occurs in plant cell walls, was investigated using time-of-flight secondary ion mass spectrometry (ToF-SIMS). The positive ToF-SIMS spectra of lignin isolated from pine and beech wood showed prominent secondary ions possessing guaiacyl (at m/z 137 and 151) or syringyl (at m/z 167 and 181) rings, which are the basic building units of lignin polymer. This shows that ToF-SIMS is a useful tool for lignin structural analysis. The peaks at m/z 137 and 167 were assigned as the C-6-C-1 ion, and the peaks at m/z 151 and 181 may be double-component, the C-6-C-1 ion and the C-6-C-2 ion. We confirmed the characteristic guaiacyl ions using a synthetic lignin model compound, dehydrogenation polymer (DHP), which was formed by polymerizing of unlabeled and deuterium-labeled coniferyl alcohols. The formation mechanism of the main secondary ions was deduced by labeling specific positions of coniferyl alcohols with a stable isotope to study the relationship between chemical structure and secondary ion formation in ToF-SIMS.