A study of the interaction between rabbit glue binder and blue copper pigment under UV radiation: A spectroscopic and PCA approach

Manzano, Eloísa; Romero-Pastor, Julia; Navas, Natalia; Rodríguez-Simón, Luis Rodrigo; Cardell, Carolina

doi:10.1016/j.vibspec.2010.04.003

Cited by 29 publications

(36 citation statements)

References 24 publications

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“…a). These PCA results suggest chemical modifications of the pure glue due to the UV ageing after 200 h of exposure, as was previously demonstrated . The combination of both components, PC1 and PC2 was necessary to distinguish among check times up to 1500 h of ageing.…”

Section: Resultssupporting

confidence: 81%

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Collagen‐based proteinaceous binder‐pigment interaction study under UV ageing conditions by MALDI‐TOF‐MS and principal component analysis

et al. 2012

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This study focuses on acquiring information on the degradation process of proteinaceous binders due to ultra violet (UV) radiation and possible interactions owing to the presence of historical mineral pigments. With this aim, three different paint model samples were prepared according to medieval recipes, using rabbit glue as proteinaceus binders. One of these model samples contained only the binder, and the other two were prepared by mixing each of the pigments (cinnabar or azurite) with the binder (glue tempera model samples). The model samples were studied by applying Principal Component Analysis (PCA) to their mass spectra obtained with Matrix-Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry (MALDI-TOF-MS). The complementary use of Fourier Transform Infrared Spectroscopy to study conformational changes of secondary structure of the proteinaceous binder is also proposed. Ageing effects on the model samples after up to 3000 h of UV irradiation were periodically analyzed by the proposed approach. PCA on MS data proved capable of identifying significant changes in the model samples, and the results suggested different aging behavior based on the pigment present. This research represents the first attempt to use this approach (PCA on MALDI-TOF-MS data) in the field of Cultural Heritage and demonstrates the potential benefits in the study of proteinaceous artistic materials for purposes of conservation and restoration.

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Section: Resultssupporting

confidence: 81%

“…cinnabar, Cin‐G; and azurite, Azu‐G) with the glue. The particular composition of the glue tempera samples (pigment/binder) was 5.2/1 (w/v) in order to obtain the combination according to Old Recipe . Once the mixtures were prepared, each was spread and dried on glass slide in five fine coats as indicated above for the PG model samples.…”

Section: Methodsmentioning

confidence: 99%

Collagen‐based proteinaceous binder‐pigment interaction study under UV ageing conditions by MALDI‐TOF‐MS and principal component analysis

et al. 2012

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“…The applied autoscaling procedure gives the same relevance to each IR spectral region and spectral regions with small variation—no relevant IR bands—can acquire the same importance as large IR bands related to structural or compositional bands. Therefore, in this study, only IR bands containing the highest variability were chosen to apply PCA . For 1800–600 cm −1 , no pattern distributions were detected when projecting the samples onto the space of the first PCs, and the score plots showed no relation between sample distribution and composition for all four color samples studied.…”

Section: Methodsmentioning

confidence: 99%

“…The red, purple, white, and blue matrices were formed by 100, 65, 85, and 135 spectra, respectively. Enamel from 3 to 7 surface areas (identified by letters from the Latin alphabet) was analyzed depending on the visual decay, and each area was characterized by the registration of five ATR‐FTIR spectra recorded under the same experimental conditions . Two spectral regions were selected on the basis of the presence of characteristic bands of the glassy phases, coloring agents, and other compounds contained in the glass.…”

Section: Methodsmentioning

confidence: 99%

“…In this sense, previous research has demonstrated the benefit of applying spectral data coupled with a multivariant analysis (e.g., Principal Component Analysis, PCA) to detect structural interactions and alteration processes in painting materials . However, very little research has been done on the combined use of these techniques in ancient glass and enamels.…”

Section: Introductionmentioning

confidence: 99%

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A Nondestructive Methodology for the Study of Colored Enamels: Insights into Manufacturing and Weathering Processes

Romero-Pastor

Navarro²,

Egido³

et al. 2013

J. Am. Ceram. Soc.

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We studied ancient enamels on gilded copper from a collection of archeological horse harness pendants of the Museo Instituto Valencia de Don Juan (Madrid, Spain) to test the benefits of a new, nondestructive analytical methodology based on chemometric analysis (i.e., Principal Component Analysis, PCA) on micro‐ATR‐FTIR spectral data and chemical quantification using SEM‐EDS. The novelty of this approach was threefold: (i) PCA allowed the discrimination of the different harness pendants of known origin and attributed to the 14th and 15th centuries according to the chemical complex composition, nanostructure, glass weathering, and/or coloring mechanisms of each colored enamel, separately (i.e., red, purple, blue, and white), (ii) it is a cheap, easily available and nondestructive methodology that enables us to (iii) draw archeological conclusions about the quality of the manufacturing process, reassess the chronology of these objects and attempt to attribute them to different workshops according to the different traditional recipes identified. In particular, the enamels were made of alkali and/or alkaline earth lead‐glass with a wide range of chemical compounds in the form of pigments or opacifiers. Two types of coloring mechanisms were identified, colloidal particles such as copper‐ruby for red enamels, and ionic mechanisms such as Fe(II) and Co(II) to achieve a blue pigments; Mn(III) in the purple pigment; and two kind of white enamels were identified, i.e., tin oxide as an opacifier and uranium oxide. In addition, we established the reason for the poor state of conservation of some of the enamels by means of the identification of depolymerization and ion exchanges, well‐known harmful effects of glass weathering, and finally a chronology was assigned for some of these pieces according to the enamel composition.

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Assessment of Raman microscopy coupled with principal component analysis to examine egg yolk–pigment interaction based on the protein CH stretching region (3100–2800 cm⁻¹)

Romero-Pastor

Cardell

Manzano

et al. 2011

J Raman Spectroscopy

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This work seeks to identify the slight changes in the characteristic C-H stretching region (3100-2800 cm −1 ) of a protein-based binder and fatty acid esters from egg yolk, which may occur in complex paint samples due to the presence of particular pigments. To date, this protein region -where historic pigments do not show characteristic Raman bands -has not been used to identify possible interactions between painting materials, in spite of its potential due to the mentioned feature. This study is based on the investigation of pure egg yolk model samples and tempera model samples prepared by mixing this binder with some historic pigments (cinnabar, raw Sienna, lead white, gypsum, calcite, azurite, lapis lazuli and smalt) as binary samples. All samples were analyzed in this region by Raman microscopy (RM) coupled with principal component analysis (PCA) for three color groups (red, white and blue) separately. The results show relevant spectral changes in the C-H stretching region of amino acids and polyunsaturated fatty acids esters of the egg yolk binder, particularly in the azurite, lead white and gypsum-based tempera samples. Lesser interactions were discerned in the tempera samples made with smalt, as well as shift in the region of polyunsaturated fatty acid esters of the egg yolk binder in the cinnabar and rawSienna-based tempera paintings. No interactions were recognized between the egg yolk and the pigments calcite and lapis lazuli. The effectiveness of applying RM combined with PCA for identifying interaction processes between binders and pigments is demonstrated.

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A study of the interaction between rabbit glue binder and blue copper pigment under UV radiation: A spectroscopic and PCA approach

Cited by 29 publications

References 24 publications

Collagen‐based proteinaceous binder‐pigment interaction study under UV ageing conditions by MALDI‐TOF‐MS and principal component analysis

Collagen‐based proteinaceous binder‐pigment interaction study under UV ageing conditions by MALDI‐TOF‐MS and principal component analysis

A Nondestructive Methodology for the Study of Colored Enamels: Insights into Manufacturing and Weathering Processes

Assessment of Raman microscopy coupled with principal component analysis to examine egg yolk–pigment interaction based on the protein CH stretching region (3100–2800 cm⁻¹)

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A study of the interaction between rabbit glue binder and blue copper pigment under UV radiation: A spectroscopic and PCA approach

Cited by 29 publications

References 24 publications

Collagen‐based proteinaceous binder‐pigment interaction study under UV ageing conditions by MALDI‐TOF‐MS and principal component analysis

Collagen‐based proteinaceous binder‐pigment interaction study under UV ageing conditions by MALDI‐TOF‐MS and principal component analysis

A Nondestructive Methodology for the Study of Colored Enamels: Insights into Manufacturing and Weathering Processes

Assessment of Raman microscopy coupled with principal component analysis to examine egg yolk–pigment interaction based on the protein CH stretching region (3100–2800 cm−1)

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Assessment of Raman microscopy coupled with principal component analysis to examine egg yolk–pigment interaction based on the protein CH stretching region (3100–2800 cm⁻¹)