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Wednesday, December 2, 2020 | History

2 edition of Molecular studies of fresh and aged triterpenoid varnishes found in the catalog.

Molecular studies of fresh and aged triterpenoid varnishes

Gisela Annabel Van der Doelen

Molecular studies of fresh and aged triterpenoid varnishes

  • 129 Want to read
  • 9 Currently reading

Published by MOLART in [Amsterdam .
Written in English

    Subjects:
  • Varnish and varnishing.,
  • Painting -- Conservation and restoration.

  • About the Edition

    Focuses on the molecular aging process of the triterpenoid resins dammar and mastic, frequently used as picture varnishes.

    Edition Notes

    Other titlesArt Conservation Department Library
    StatementGisela Annabel van der Doelen.
    SeriesMOLART reports -- 1
    ContributionsState University College at Buffalo. Dept. of Art Conservation., MOLART (Project)
    The Physical Object
    Pagination[8], 178 p. ;
    Number of Pages178
    ID Numbers
    Open LibraryOL22860704M
    ISBN 109080170437
    ISBN 109789080170438

      9. van der Doelen, G.A., Molecular Studies of Fresh and Aged Triterpenoid Varnishes, University of Amsterdam,


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Molecular studies of fresh and aged triterpenoid varnishes by Gisela Annabel Van der Doelen Download PDF EPUB FB2

Are investigated by comparative studies of fresh resins, aged varnishes from paintings and artificially aged varnishes. This chapter starts with a overview of the use of dammar and mastic resin as painting varnishes. A descriptive model is postulated for the molecular ageing of triterpenoid varnishes Cited by: Molecular studies of fresh and aged triterpenoid varnishes Supervisors.

J.J. Boon. Award date 25 March Document type Aged triterpenoid varnishes from paintings; Chapter 4: Artificially light aged varnishes; Chapter 5: Artificial ageing of varnish triterpenoids in solution; Chapter 6: Mass spectrometric analysis of triterpenoids in. Molecular studies of fresh and aged triterpenoid varnishes () Pagina-navigatie: Main; Save publication.

Save as MODS; Export to Mendeley; Save as EndNoteCited by: Printed books can be ordered from JAAP-Enterprise for Art Scientific Studies using the contact form.

MOLART Reports book series. Report 1. Gisela A. van der Doelen, Molecular studies of fresh and aged triterpenoid varnishes. With atlas of mass spectra of triterpenoids. ISBN Report 2. Petri deWilligen, The triterpenoid resins dammar and mastic are frequently used as varnishes for paintings.

Unfortunately, these varnishes degrade in the course of time. A large number of aged yellowed varnishes taken from paintings from several museum collections was analyzed by gas chromatography/mass spectrometry (GC/MS) to identify oxidized triterpenoids.

Molecular studies of fresh and aged triterpenoid varnishes van Doelen, G.A. Link to publication Citation for published version (APA): van Doelen, G. Molecular studies of fresh and aged triterpenoid varnishes.

General rights. (). Comparative chromatographic and mass-spectrometric studies of triterpenoid varnishes: fresh material and aged samples from paintings.

Studies in. In earlier SEC studies of aged varnishes from paintings at nm, a MW increase absorbing strongly at molecular weights greater than Da was detected, while artificially aged dammar resins in solution absorbed intensely at Da with shoulders at higher molecular weights. This molecular mass increase was associated with yellowing.

Direct temperature mass spectrometric study on the depth-dependent compositional gradients of aged triterpenoid varnishes. Author links open overlay panel Charis Theodorakopoulos a Jaap J. Boon b Vassilis Zafiropulos c. Triterpenoid varnish. Laser ablation. Gradient. In relatively fresh varnishes, however, the extent of oxidation can limit yellowing, and the more strongly oxidized varnishes aged in light may be more yellow than aged in Molecular studies of fresh and aged triterpenoid varnishes book.

In previously photoaged varnishes, enough oxygen is incorporated in the form of ketones and hydroxy moieties that the same yellow substances develop even under a.

1. Introduction. Terpenoids, which are widely distributed in nature in both the plant and animal kingdom, are made up of units of the C 5 compound isoprene.

Triterpenoids are C 30 alicyclic compounds which often contain several functional groups. Triterpenoid resins are used as varnishes on paintings, in order to increase the colour saturation and gloss, and to protect against ageing of the.

Photochemical and thermal aging of triterpenoid dammar and mastic resins used as varnishes on paintings were studied using graphite-assisted laser desorption/ionization mass spectrometry.

This extends an earlier study on similar materials (Zumbühl et al., Anal. Chem.70, −) that focused on photoaging. Progressive aging results in development of groups of signals spaced by 14. The project examined selected paintings by Edvard Munchs paintings in the Munch Museum (MUM) in Oslo that had been varnished with ketone resins.

23 paintings attributed to Munch (–) were. Analysis of fresh triterpenoid resins and aged triterpenoid varnishes by high-performance liquid chromatography–atmospheric pressure chemical ionisation (tandem) mass spectrometry Author links open overlay panel Gisela A van der Doelen a Klaas Jan van den Berg a Jaap J Boon a Nobuko Shibayama b E René de la Rie b Wim J L.

Genuit c. A high performance size exclusion chromatographic study on the depth-dependent gradient in the molecular weight of aged triterpenoid varnish films book provided.

The most important and. Molecular studies of fresh and aged triterpenoid varnishes, Gisela A. van der Doelen, ISBN 2. A mathematical study on craquelure and other mechanical damage in paintings, Petri de Willigen, ISBN 3.

Solvent extractable components of oil paint films, Kenneth R. Sutherland, ISBN 4. A high performance size exclusion chromatographic study on the depth-dependent gradient in the molecular weight of aged triterpenoid varnish films.

Progress in Organic Coatings72 (4), DOI: /at Giuseppe Spoto, Giuseppe Grasso. Research employing mass spectrometric techniques has identified many molecular changes in varnishes as a Two fresh and artificially aged triterpenoid varnishes, dammar and. Dominique Scalarone, Marc C.

Duursma, Jaap J. Boon, Oscar Chiantore, MALDI‐TOF mass spectrometry on cellulosic surfaces of fresh and photo‐aged di‐ and triterpenoid varnish resins, Journal of Mass Spectrometry, /jms, 40, 12, (), ().

Direct temperature mass spectrometric study on the depth-dependent compositional gradients of aged triterpenoid varnishes Article in International Journal of Mass Spectrometry (1) Various studies have been done on fresh resins of dammar are the result of molecular modifications in the varnish which occur with aging: aromatic ring scission in the aged varnish may lead to.

Van der Doelen GA: Molecular studies of fresh and aged triterpenoid varnishes. Ph.D. thesis.University of Amsterdam, ISBN: Google Scholar. study of photochemical and thermal aging of triterpenoid varnishes, Anal.

Chem. 73 () e [28] G. Thomson, New picture v arnishes, in: G. Thomson (Ed.), Recent. for Atomic and Molecular Physics, KruislaanSJ Amsterdam, The Netherlands.

Previously issues of the MOLART series: 1. Molecular studies of fresh and aged triterpenoid varnishes, Gisela A. van der Doelen, ISBN 2.

A mathematical study on craquelure and other mechanical damage in paintings, P. de Willigen,   Stabilized dammar picture varnish. Studies in conservation 34(3)– de la Rie, E.R. and A.M. Shedrinsky.

The Chemistry of ketone resins and the synthesis of a derivative with increased stability and flexibility. Studies in conservation 34(1):9– Thomson, G. Some picture varnishes.

Studies in conservation 3(2)– SPECTROMETRIC STUDIES OF TRITERPENOID VARNISHES: FRESH MATERIAL AND AGED SAMPLES FROM PAINTINGS Gisela A. van der Doelen, Klaas Jan van den Berg and Jaap J. Boon Summary-The triterpenoid resins dammar and mastic are frequently used as varnishes for paintings. Unfortunately, these varnishes degrade in the course of time.

In this work, we report that polarization second harmonic generation (PSHG) microscopy, commonly used in biomedical imaging, can quantitatively discriminate naturally aged from fresh starch-based glues used for conservation or restoration of paintings, works of art on paper, and books.

Several samples of fresh and aged (7 years) flour and. Dammar, also called dammar gum, or damar gum, is a resin obtained from the tree family Dipterocarpaceae in India and East Asia, principally those of the genera Shorea or Hopea (synonym Balanocarpus).Most is produced by tapping trees, however, some is collected in fossilised form on the ground.

The gum varies in colour from clear to pale yellow, while the fossilised form is grey-brown. from Prof. J.J. Boon, FOM-Institute for Atomic and Molecular Physics, KruislaanSJ Amsterdam, The Netherlands, [email protected] 1.

Molecular studies of fresh and aged triterpenoid varnishes, Gisela A. van der Doelen, ISBN A mathematical study on craquelure and other mechanical damage in paintings.

Spectroscopic Investigations on the Depth-Dependent Degradation Gradients of Aged Triterpenoid Varnishes. Applied Spectroscopy61 (10), DOI: / Andrea Cavicchioli, Dalva L.A. de Faria. Analysis of fresh triterpenoid resins and aged triterpenoid varnishes by high-performance liquid chromatography-atmospheric pressure chemical ioniation (tandem) mass spectrometry.

Journal of Chromatography A, AThese were incubated and analyzed by GC-MS to determine both the microbiological capacity of growth and chemical alteration on the resin.

Some of the studied microorganisms have shown patterns of deterioration similar to those found in works dedicated to natural or accelerated photochemical ageing of triterpenoid varnishes.

Studies of the organic materials used in Triterpenoid acids, including a J. Comparative chromatographic and mass spectrometric studies of triterpenoid varnishes: fresh material and aged.

A high performance size exclusion chromatographic study on the depth‐dependent gradient in the molecular weight of aged triterpenoid varnish films”, ().

A study of the mechanical and surface properties of oil paint films treated with organic solvents and water”. standards, fresh and aged triterpenoid resins were analysed using selected derivatization conditions.

Fresh dammar resin from the species Shorea javan-ica (supplied by Adam Messer) was analysed. Two aged varnishes were analysed: one from the paint-ing Nude on a blue cushion by Modigliani (National Gallery of Art, Washington DC, acc.

Samples of fresh dammar varnish (natural resin) and Paraloid B72 (synthetic resin) applied on glass and carbon black acrylic paint were analyzed.

Both varnishes were considered as perfect dielectrics, and the real part of their refractive index was described by the Cauchy model: n (λ) = A + B /λ 2 + C/ λ 4. "Analysis of Fresh Triterpenoid Resins and Aged Triterpenoid Varnishes by HPLC APCI-MS (/MS)." Journal of Chromatography A (): 21– Whitten, Jill.

"Characteristics of Low Molecular Weight Resins." In Painting Conservation Catalog: Varnishes and Surface Coatings, edited by Wendy Samet, 53– Washington: Paintings Specialty Group. A short description of the origin, physical properties, classification and chemical composition of the most abundant natural resins from trees and plants is presented, some of which have been used since immemorial times as adhesives and coatings.

It is in this form that they occur most commonly as museum materials. Fossil resins such as amber and hard copals have also been used to make objects. Analysis of fresh triterpenoid resins and aged triterpenoid varnishes by high-performance liquid chromatography–atmospheric pressure chemical ionisation (tandem) mass spectrometry.

Journal of Chromatography A(), Comparative Chromatographic and Mass-Spectrometric Studies of Triterpenoid Varnishes: Fresh Material and Aged Samples from Paintings (pp. ) Gisela A. van der Doelen, Klaas Jan van den Berg and Jaap J.

Boon. A high performance size exclusion chromatographic study on the depth-dependent gradient in the molecular weight of aged triterpenoid varnish films.

Progress in Organic Coatings72 (4), DOI: /at  The interpenetration of a varnish layer into a paint layer, which has sometimes been reported (Wolbers15, 31), may indicate that a varnish was applied while a paint layer was still very fresh, although varnish may also penetrate into an aged paint film .assessment of degradation of the outer protective layers of painted artworks as a function of depth due to aging.

Two fresh and artificially aged triterpenoid varnishes, dammar and mastic, were.