Issue 7, 2016
From the journal:

Analytical Methods

Low molecular weight organic acid salts, markers of old fungi activity in wall paintings

Nati Salvadó,*ab   Salvador Butí,ab   Trinitat Pradell,bc   Victòria Beltran,ab   Gianfelice Cinque,d   Jordi Juanhuix,e   Lídia Fontf  and  Rosa Senserrichg  

* Corresponding authors

a Dpt. d'Enginyeria Química. EPSEVG. Universitat Politècnica de Catalunya, Av. Víctor Balaguer s/n, 08800 Vilanova i la Geltrú, Barcelona, Spain
E-mail: nativitat.salvado@upc.edu
Fax: +34 0034938967700
Tel: +34 0034938967717

b Center for Research in Nano-Engineering, Universitat Politècnica de Catalunya, Barcelona, Spain

c Dpt. Física. Universitat Politècnica de Catalunya. Campus del Baix Llobregat, c. Esteve Terradas 8, 08860 Castelldefels, Barcelona, Spain

d Diamond Light Source, Harwell Campus, Chilton-Didcot OX11 0DE Oxon, UK

e CELLS-ALBA Synchrotron, Ctr. BP 1413, de Cerdanyola a Sant Cugat, km 3, 3, 08290 Cerdanyola del Vallès, Barcelona, Spain

f Museu d’Historia de Barcelona MUHBA, Institut de Cultura, Ajuntament de Barcelona, Llibreteria 7 4t, 08002 Barcelona, Spain

g Secció de Conservació i de Restauració de la Facultat de Belles Arts, Universitat de Barcelona, Pau Gargallo 4, 08024 Barcelona, Spain

Abstract

Micro-Infrared Spectroscopy (μSR-FTIR) and X-ray diffraction (μSR-XRD) with synchrotron light, Gas Chromatography/Mass Spectrometry (CG/MS), Optical Microscopy (OM) and Scanning Electron Microscopy (SEM/EDS) were used to identify and obtain the distribution of complex mixtures of calcium salts of low molecular weight organic acids (LMWOA) in micro-layered micro-samples. Filamentous fungi produce LMWOA that can react with metal cations producing stable salts. These substances were found in the dark spots covering the surfaces of Saint Michael's Chapel wall paintings of the Royal Monastery of Pedralbes in Barcelona linking them to old fungi activity. The presence of glycerol likewise related to the fungi activity is also identified in the layers.

Graphical abstract: Low molecular weight organic acid salts, markers of old fungi activity in wall paintings

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Article information

DOI
https://doi.org/10.1039/C5AY02656C
Article type
Paper
Submitted
06 Oct 2015
Accepted
22 Jan 2016
First published
22 Jan 2016

Anal. Methods, 2016,8, 1637-1645

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Low molecular weight organic acid salts, markers of old fungi activity in wall paintings

N. Salvadó, S. Butí, T. Pradell, V. Beltran, G. Cinque, J. Juanhuix, L. Font and R. Senserrich, Anal. Methods, 2016, 8, 1637 DOI: 10.1039/C5AY02656C

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