Interactions between inorganic pigments and proteinaceous binders in reference paint reconstructions (Articolo in rivista)

Type
Label
  • Interactions between inorganic pigments and proteinaceous binders in reference paint reconstructions (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/C2DT32203J (literal)
Alternative label
  • Duce C.; Bramanti E.; Ghezzi L.;, Bernazzani L.; Bonaduce I.; Colombini M.P.; Spepi A.; Biagi S.; Tine M.R. (2013)
    Interactions between inorganic pigments and proteinaceous binders in reference paint reconstructions
    in Dalton transactions (2003. Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Duce C.; Bramanti E.; Ghezzi L.;, Bernazzani L.; Bonaduce I.; Colombini M.P.; Spepi A.; Biagi S.; Tine M.R. (literal)
Pagina inizio
  • 5975 (literal)
Pagina fine
  • 5984 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 42 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 10 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 17 (literal)
Note
  • Scopus (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • aDipartimento di Chimica e Chimica Industriale, Via Risorgimento 35, 56127 Pisa, Italy. E-mail: mrt@dcci.unipi.it bNational Research Council of Italy, C.N.R., Istituto di Chimica dei Composti Organo Metallici-ICCOM-UOS Pisa, Area di Ricerca, Via G. Moruzzi 1, 56124 Pisa, Italy cNational Research Council of Italy, C.N.R., Istituto per i Processi Chimico-Fisici, Area di Ricerca, Via G. Moruzzi 1, 56124 Pisa, Italy (literal)
Titolo
  • Interactions between inorganic pigments and proteinaceous binders in reference paint reconstructions (literal)
Abstract
  • The degradation of the proteinaceous binders, ovalbumin (OVA) and casein, and their interactions with azurite (Cu-3(CO3)(2)(OH)(2)), calcium carbonate (CaCO3), hematite (Fe2O3) and red lead (Pb3O4) pigments were studied. A multi-analytical approach based on Thermogravimetric Analysis (TG), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR) and Size Exclusion Chromatography (SEC) was used. The research was carried out on a set of paint reconstructions, which were analysed before and after artificial light ageing. We highlighted that in most cases the inorganic pigments interact with both proteins by decreasing their thermal stability and their intermolecular beta-sheet content, and that ageing induces aggregation. We hypothesized that pigments intercalate between protein molecules, producing a partial disruption to the protein-protein intermolecular interaction. In the case of casein, these phenomena continued during ageing. In fact, we observed a complete disappearance of intermolecular beta-sheets and an increase in intramolecular beta-sheets and random coil during ageing. This result is in agreement with the structural properties of casein, whose aggregation is known to be induced by hydrophobic interactions. On the other hand, in aged OVA paint replicas, we observed the formation of new intermolecular beta-sheets and an increase in thermostability. In addition FTIR showed oxidation of the side chains of the aged OVA/hematite sample and aged casein pigment samples, and SEC highlighted hydrolysis phenomena in aged carbonate, azurite and red lead/OVA complexes and in aged casein/calcium carbonate and casein/azurite samples. (literal)
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