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Issue 3, 2003
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Application of the Kohonen artificial neural network in the identification of proteinaceous binders in samples of panel painting using gas chromatography-mass spectrometry

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Abstract

Historically, three types of proteinaceous matter—casein, egg and animal glue—were used as binders for pigments or as adhesives in easel and wall painting. The relative percentage content of alanine, glycine, valine, leucine, isoleucine, serine, tyrosine, phenylalanine, aspartic acid, glutamic acid, lysine, methionine, proline and hydroxyproline, as determined by GC-MS, is used for binder identification. In this paper we analyse the viability of a multivariate modelling using Kohonen's neural network to characterise the wood adhesive in 16 old samples from Italian panel paintings of the 12–16th centuries. As a training set we use the amino acid composition of 141 samples contributed by the Opificio delle Pietre Dure of Florence (Cultural Heritage Ministry, Italy). Of the 141 samples, 113 were used to train the Kohonen neural network and the remaining 28 as the evaluation set. A specificity and sensitivity of 100% was achieved in training and 92–100% in prediction depending on the assignation criteria employed. The neural network thus trained and evaluated was applied to the old samples, achieving identification of all of them. In addition, the map obtained for each amino acid provides relevant information as to its importance in the characterisation of the sample.

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Publication details

The article was received on 17 Dec 2002, accepted on 18 Feb 2003 and first published on 25 Feb 2003


Article type: Paper
DOI: 10.1039/B212509A
Citation: Analyst, 2003,128, 281-286
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    Application of the Kohonen artificial neural network in the identification of proteinaceous binders in samples of panel painting using gas chromatography-mass spectrometry

    R. Lletí, L. A. Sarabia, M. C. Ortiz, R. Todeschini and M. P. Colombini, Analyst, 2003, 128, 281
    DOI: 10.1039/B212509A

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