Direct exposure electron ionization mass spectrometry and gas chromatography/mass spectrometry techniques to study organic coatings on archaeological amphorae
Direct exposure electron ionization mass spectrometry and gas chromatography/mass spectrometry techniques to study organic coatings on archaeological amphorae
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DOI：
10.1002/jms.841
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发表时间：
2005-05-01
影响因子：
2.3
通讯作者：
Ribechini, E
中科院分区：
文献类型：
--
作者：
Colombini, MP;Modugno, F;Ribechini, E
本文比较了直接暴露电子电离质谱（DE-MS）和气相色谱/质谱（GC/MS）两种不同的分析方法在考古文物分析中的应用。DE-MS被认为是一种有效的指纹工具，用于快速筛选有机考古样品和提供有关主要成分的信息。GC/MS似乎是更有效地解开样品组成在分子水平上，尽管分析时间长，需要湿化学预处理。这两个程序被施加到表征的有机材料存在的涂层在罗马和埃及的双耳细颈瓶。DE-MS成功鉴定了松香烷类化合物，因此可以鉴定二萜类化合物并评估其氧化程度。GC/MS鉴定了脱氢枞酸、7-氧代脱氢枞酸、15-羟基-7-氧代脱氢枞酸、15-羟基脱氢枞酸、retene、四氢retene、norabietatriene、norabietatriene和脱氢枞酸甲酯。这些氧化和芳香化的松香烷提供了证据，证明所研究的双耳瓶是用松科植物的软木制成的沥青防水的。GC/MS数据的化学计量学评价突出了在两个考古遗址中发现的沥青之间的显着化学差异，基本上与材料的生产技术及其降解途径的差异有关。版权所有（c）2005年约翰威利父子有限公司。
Two different analytical approaches, direct exposure electron ionization mass spectrometry (DE-MS) and gas chromatography/mass spectrometry (GC/MS), were compared in a study of archaeological resinous materials. DE-MS was found to be an efficient fingerprinting tool for the fast screening of organic archaeological samples and for providing information on the major components. GC/MS appeared to be more efficient in unravelling the sample composition at a molecular level, despite the long analysis time and the need for a wet chemical pretreatment. Both procedures were applied to characterize the organic material present as coatings in Roman and Egyptian amphorae. DE-MS successfully identified abietanic compounds, hence a diterpenic resinous material could be identified and its degree of oxidation assessed. GC/MS enabled us to identify clehydroabietic acid, 7-oxodehydroabietic acid, 15-hydroxy-7-oxodehydroabietic acid, 15-hydroxydehydroabietic acid, retene, tetrahydroretene, norabietatriene, norabietatetraene and methyl dehydroabietate. These oxidized and aromatized abietanes provided evidence that the amphorae examined were waterproofed with a pitch produced from resinous wood of plants from the Pinaceae family. The chemometric evaluation of the GC/MS data highlighted significant chemical differences between the pitches found in the two archaeological sites, basically related to differences in the production techniques of the materials and in their degradation pathways. Copyright (c) 2005 John Wiley & Sons, Ltd.