GALDI‐MS Applied to Characterise Natural Varnishes and Binders

Dietemann, Patrick; Herm, Christoph

doi:10.1002/9780470741917.ch5

Cited by 9 publications

(4 citation statements)

References 39 publications

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“…Thus, secondary oxidation reactions are limited. Such a reduced light sensitivity of unsaturated ketones was also observed from graphite-assisted laser desorption/ionization-mass spectrometry (GALDI-MS) measurements on other pure terpenes . Exposure to UVA containing light, however, leads to different aging pathways.…”

Section: Results and Discussionmentioning

confidence: 67%

Derivatization Technique To Identify Specifically Carbonyl Groups by Infrared Spectroscopy: Characterization of Photooxidative Aging Products in Terpenes and Terpeneous Resins

et al. 2017

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Analysis of bioorganic materials by infrared spectroscopy (FT-IR) is frequently limited due to overlapping of diagnostic bands from the various components, which poses a fundamental problem to this analytical technique. The distinction of oxidized di- and triterpenes, for example, is hindered by the superposition of similar absorption bands of carbonyl functional groups summing up to a broad, nondistinctive signal. This study presents a technique for selective fluorination of various carboxylic acids by exposure to gaseous sulfur tetrafluoride. The derivatization treatment leads to characteristic band shifts, allowing the separation of otherwise overlapping bands. Accordingly, the IR bands of primary acids, α,β-unsaturated acids, tertiary acids, peroxy acids, esters, ketones, and α,β-unsaturated ketones are split into distinct absorption bands. The capability of this method is demonstrated on the example of natural resins and their ingredients, which are commonly known to be susceptible to oxidation at ambient conditions. The derivatization method enables one to identify various carbonyl containing functional groups by infrared spectroscopy, even in complex mixtures of terpenes. It unveils previously hidden degradation reactions running in terpenes and natural resins exposed to artificial aging by irradiation with light. New insight is presented on the individual reaction pathways of the terpenes hydroxydammarenone and abietic acid as well as of natural resin varnishes made from dammar and colophony.

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Section: Results and Discussionmentioning

confidence: 67%

Derivatization Technique To Identify Specifically Carbonyl Groups by Infrared Spectroscopy: Characterization of Photooxidative Aging Products in Terpenes and Terpeneous Resins

et al. 2017

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“…One the most important techniques is high-performance liquid chromatography (HPLC) coupled with mass spectrometry or UV detection, as well as gas chromatography (GC) coupled with mass spectrometry. Chromatographic techniques are used to analyse a variety of different organic components such as varnishes or binding media [30,31], dyes or colourants [32] and polymers or adhesives used for historical restorations. In the field of preventive conservation, chromatographic methods are essential in analysing volatile organic compounds (VOC) to determine their impact on cultural heritage objects [33,34].…”

Section: Techniquesmentioning

confidence: 99%

Diagnostics in Arts and Culture

Hahn

2013

Handbook of Technical Diagnostics

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“…Given the limitations in taking samples from such objects, how often they are recoated or restored, and how often they may have lost a significant part of their original coating, the identification of these original coatings is one of the main challenges for researchers. There are a variety of methods for identifying historical resins and coatings, including techniques based on chromatography and mass spectrometry, which are relatively expensive [11][12][13][14][15][16]. However, more affordable spectroscopic methods such as Raman spectroscopy and especially Fourier transform infrared spectroscopy also have a good track record in identifying the molecular structure of complex organic compounds like those of coatings used on historical objects [17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Identification of Coatings on Persian Lacquer Papier Mache Penboxes by Fourier Transform Infrared Spectroscopy and Luminescence Imaging

2021

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In this study, Fourier transform infrared spectroscopy (FTIR) and luminescence imaging were used to identify the coatings of seven Persian lacquer papier mache penboxes, of which two were contemporary, one was from the Pahlavi era, and four belonged to the Qajar era. First, FTIR was used to identify the nature of the coating. Then, visible-induced luminescence imaging at the spectral ranges of 420–680 nm (UVL), 425–495 nm (UVIBL), and 615–645 nm (UVIRL) was performed for further examination. The FTIR results showed that the coatings were made of alkyd resin, oil-resin varnish (Kaman oil), and shellac. In visible-induced luminescence images, synthetic alkyd resin showed no fluorescence, which made it distinguishable from the natural organic coatings. While it is slightly challenging to differentiate Kaman oil from shellac based on FTIR results, these two coatings can be easily distinguished by their fluorescence in UVL and UVIBL images. The results suggest that the combined use of spectroscopy and spectral imaging methods can provide substantial information about the organic coatings of historical objects.

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GALDI‐MS Applied to Characterise Natural Varnishes and Binders

Cited by 9 publications

References 39 publications

Derivatization Technique To Identify Specifically Carbonyl Groups by Infrared Spectroscopy: Characterization of Photooxidative Aging Products in Terpenes and Terpeneous Resins

Derivatization Technique To Identify Specifically Carbonyl Groups by Infrared Spectroscopy: Characterization of Photooxidative Aging Products in Terpenes and Terpeneous Resins

Diagnostics in Arts and Culture

Identification of Coatings on Persian Lacquer Papier Mache Penboxes by Fourier Transform Infrared Spectroscopy and Luminescence Imaging

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