Academic thesis

Barbara Hentschel: Biochemical Methods For Thinning Consolidant Coatings – Alternatives To The Use Of Solvents? Back
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Dark stains of mould fungi at a ceiling painting.
Abstract: The impulse for this thesis was the situation of the painted ceiling by A. Kolb (1927) in the St. Mauritius church in Ibbenbüren: During a conservation intervention during the 1970s the painting, originally executed in casein paints, was coated with a consolidating film of acrylic resin (Paraloid®/Acryloid B 72). Ever since a strong colonization with the mould fungus Aspergillus fumigatus is detected on the treated surfaces. A direct coherence between the colonization of the painted ceiling and the introduction of acrylic resins could be shown. The release of the fungal toxin Gliotoxin, which is produced by Aspergillus fumigatus through solvents which are conventionally used to thin such coatings, was also proven.
Thereupon microorganisms were examined for their ability to break down Paraloid®/Acryloid B 72 and Primal® AC 33 as their nutrient. With Beauveria alba and Bacillus subtilis two organisms could be found, which seem to be suited for the development of biochemical methods for thinning acrylic coatings. The documented conditions for growth of Beauveria alba, in particular, make this mould fungus and its extracellular enzymes seem to make it interesting for the use in the field of wall paintings. Experiments to produce and to test enzyme-containing solutions followed.

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Keywords: acrylic resin, mould, enzymes, fungal toxin, coatings
 
Micrograph showing the pervasion of Paralloid/Acryloid B 27 by Beauveria alba
Details:
  • academic institution: HAWK Hochschule für angewandte Wissenschaft und Kunst Hildesheim/ Holzminden/Göttingen
  • kind of theses:  Masterarbeit
  • main Tutor:  Prof. Dr. Karin Petersen
  • assistant Tutor:  Prof. Dr. Thomas Scheper
  • date:  2006
  • Language:  German
  • pages:  110
  • pictures:  45
 
Contact:
 
Barbara Hentschel
Von-Steuben-Str. 20
31135  Hildesheim
Deutschland
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