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Expanding the Library of Secondary Ions That Distinguish Lignin and Polysaccharides in Time-of-Flight Secondary Ion Mass Spectrometry Analysis of Wood

机译:扩大木材飞行时间二次离子质谱分析中区分木质素和多糖的二次离子库

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摘要

Extracted pine (Pinus spp.) wood and the holocellulose and cellulose fractions of pine were analyzed by time-of-flight secondary ion mass spectrometry (ToF-SIMS). The main sources of variation among wood constituents were elucidated by principal component analysis (PCA). Peaks characteristic of lignin or polysaccharides were identified through the combination of high mass resolution analyses of pine fractions and high lateral resolution image analyses distinguishing the lignin-rich middle lamella from the secondary cell wall layers in solid wood cross-sections. A collection of peaks was compiled which (1) extends the library of characteristic lignin and polysaccharide secondary ions in wood, (2) can be applied to both high and nominal mass resolution spectra, and (3) is free from peaks that contraindicate between wood components. The removal of additional peaks to avoid mass interferences with common contaminants was also successful. Many of the characteristic peaks were high-intensity fingerprint ions below m/z 100, which provided for rapid analysis of the lignin and polysaccharide biopolymers in woody samples. The analysis also identified important mass interferences with previously reported wood ions.
机译:通过飞行时间二次离子质谱仪(ToF-SIMS)分析了提取的松木(Pinus spp。)木材以及松木的全纤维素和纤维素级分。主要成分分析(PCA)阐明了木材成分之间变异的主要来源。木质素或多糖的峰特征是通过对松木馏分的高质量解析度分析和高横向分辨率图像分析相结合来确定的,从而将富含木质素的中间层与实木横截面上的次生细胞壁层区分开。汇编了一组峰,这些峰(1)扩展了木材中特征性木质素和多糖二次离子的库,(2)可以应用于高和标称质量分辨率谱图,并且(3)没有峰在木材之间禁忌组件。去除其他峰以避免对常见污染物的质量干扰也很成功。许多特征峰是低于m / z 100的高强度指纹离子,可快速分析木质样品中的木质素和多糖生物聚合物。该分析还确定了对先前报道的木质离子的重要质量干扰。

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