A definitive analytical spectroscopic study of Indian yellow, an ancient pigment used for dating purposes
| Autor: | Dalva Lúcia Araújo de Faria, Nicholas Walt, Howell G. M. Edwards, Valeria P. Careaga, Marta S. Maier |
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| Rok vydání: | 2016 |
| Předmět: |
PIGMENT
TARTRAZINE Analytical chemistry 02 engineering and technology Nuclear Overhauser effect INDIAN YELLOW 01 natural sciences Pathology and Forensic Medicine chemistry.chemical_compound symbols.namesake ARTWORK Indian yellow Spectroscopy OBRA DE ARTE Chemistry Otras Ciencias Químicas 010401 analytical chemistry Ciencias Químicas 021001 nanoscience & nanotechnology 0104 chemical sciences Heteronuclear molecule RAMAN SPECTROSCOPY symbols 0210 nano-technology Raman spectroscopy Law Two-dimensional nuclear magnetic resonance spectroscopy CIENCIAS NATURALES Y EXACTAS Tartrazine Heteronuclear single quantum coherence spectroscopy |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1872-6283 |
| Popis: | The Raman spectrum of tartrazine has been mistakenly reported as being that of Indian yellow in the literature, which has serious consequences for the identification of this pigment in art works regarding their authentication. Unlike tartrazine, Indian yellow (a natural mixture of the magnesium and calcium salts of euxanthic acid) exhibits in its Raman spectrum a strong fluorescent background when visible excitation is used, however, excitation in the near infrared (1064 nm) permitted the observation of the Raman bands from the raw pigment with the main features placed at 1346, 1368, 1425, 1441 and 1626 cm−1. Indian yellow identification was assured by 1H and 13C Nuclear Magnetic Resonance characterization and the complete assignment of the proton and carbon resonances was accomplished using heteronuclear single quantum correlation (HSQC), heteronuclear multiple bond correlation (HMBC), nuclear overhauser effect spectroscopy (NOESY) and 1H–1H correlation spectroscopy (COSY). Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and X-ray fluorescence (XRF) analyzes were also conducted on a genuine sample of this historical pigment. Fil: de Faria, Dalva L.A.. Universidade de Sao Paulo; Brasil Fil: Edwards, Howell G. M.. University of Bradford; Reino Unido Fil: Careaga Quiroga, Valeria Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad de Microanálisis y Métodos Físicos en Química Orgánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de Microanálisis y Métodos Físicos en Química Orgánica; Argentina Fil: Walt, Nicholas. L. Cornelissen & Son; Reino Unido Fil: Maier, Marta Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad de Microanálisis y Métodos Físicos en Química Orgánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de Microanálisis y Métodos Físicos en Química Orgánica; Argentina |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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