van Bergen P F, Poole I, Ogilvie T M, Caple C, Evershed R P
Organic Geochemistry Group, Faculty of Earth Sciences, Utrecht University, PO Box 80021, 3508 TA Utrecht, The Netherlands.
Rapid Commun Mass Spectrom. 2000;14(2):71-9. doi: 10.1002/(SICI)1097-0231(20000130)14:2<71::AID-RCM837>3.0.CO;2-9.
Archaeological oak (Quercus sp.) wood samples, ranging from 16(th) C. AD to 6000 BP, were studied using flash pyrolysis-gas chromatography/mass spectrometry to obtain insight into angiosperm lignin degradation. The pyrolysates revealed evidence of a number of 3-methoxy-1,2-benzenediol derivatives, methoxycatechols, directly related to 2,6-dimethoxyphenol, syringyl, moieties which are characteristic building blocks of angiosperm lignin. Mass spectra and mass chromatograms of these compounds are reported. The finding of these characteristic pyrolysis products in well-preserved archaeological wood provides unequivocal evidence that demethylation of syringyl units occurs very early in wood degradation. It is highly likely that the absence of abundant 3-methoxy-1, 2-benzenediols in degrading plant materials containing angiosperm lignin relates to the lability of these newly formed moieties.
利用闪速热解-气相色谱/质谱联用技术对公元16世纪至公元前6000年的考古橡木（栎属）木材样本进行了研究，以深入了解被子植物木质素的降解情况。热解产物显示出一些与2,6-二甲氧基苯酚、紫丁香基部分直接相关的3-甲氧基-1,2-苯二酚衍生物、甲氧基儿茶酚的证据，这些是被子植物木质素的特征性结构单元。报道了这些化合物的质谱和质量色谱图。在保存完好的考古木材中发现这些特征性热解产物，明确证明了紫丁香基单元的去甲基化在木材降解的早期就会发生。含有被子植物木质素的降解植物材料中缺乏大量的3-甲氧基-1,2-苯二酚，很可能与这些新形成部分的不稳定性有关。
