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Gewählte Doctoral Thesis:

Doctoral Thesis - Abteilung für Chemie nachwachsender Rohstoffe, BOKU-Universität für Bodenkultur, pp 161. UB BOKU obvsg FullText

Data Source: ZID Abstracts
The aim of this work was the development of analytical methods using ambient ionization techniques to detect the so-called key chromophores in cellulose-containing substrates. Two different techniques were used for this purpose: desorption electrospray ionization (DESI) coupled with mass spectrometry, and paper spray mass spectrometry (MS) for the investigation of historical rag papers. After comparing the applicability of the two techniques, paper spray-MS was selected because of its lower detection limit. A derivatization reaction based on gas-phase acetylation was tested to create a semi-quantitative analytical method in the first instance. Subsequently, a reactive paper spray-MS method was developed to lower the detection limits. The method is fast and accurate and can be carried out with high sample throughput due to its simplicity of application. In addition to historical samples, the method is also used for artificially aged paper samples to generate a statistical model for the generation of the key chromophores. In addition to ambient ionization techniques, a gas chromatographic method was also developed, which can be coupled with various detection methods. The aim here is the possible transfer to industrial laboratories to analyze traces of aging products from modern pulps. The detection limit of the Electron capture detector coupled to gas chromatography (GC-ECD) is approximately as low as that of the paper spray-MS methods that were developed. In addition, DESI-MS was used as a surface analysis method for the detection of Polycyclic aromatic hydrocarbons (PAHs). These arise from the combustion processes of organic compounds like paper as well. The method was applied to book samples that were severely affected by a fire. Thanks to the non-destructive measurement technique, chemical images of the samples could be prepared without further destruction and different combustion zones could be distinguished. All methods are adequately tested and can be used for routine analysis.

Betreuer: Potthast Antje
1. Berater: Rosenau Thomas
2. Berater: Böhmdorfer Stefan

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