Spectral characterisation of a traditional Mesoamerican dye: relationship between in situ identification on the 16th century Codex Borbonicus manuscript and composition of Justicia spicigera plant extract

文献信息

发布日期 2021-03-31
DOI 10.1039/D1AN00113B
影响因子 4.616
作者

Lucie Arberet, Fabien Pottier, Anne Michelin, Ludovic Bellot-Gurlet, Christine Andraud


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摘要

Characterisation of vegetal colourants in manuscripts is still a challenging task. Their identification using non-invasive techniques – since sampling is rarely possible – is valid only if there is evidence that the recorded signals are generated by compounds specific to the plant species. Otherwise, more extensive chemical characterisations are required to relate the non-invasive technique signals to the chemical composition of the dye extract and thus avoid misidentification. The case study of a traditional Mesoamerican dye found in the Codex Borbonicus is reported herein. The non-invasive identification of the colourant plant source and chemical characterisation of the coloured molecules were carried out through a multi-analytical technique approach. In situ Raman and UV-Vis emission fluorescence signals suggested the use of Justicia spicigera leaves to produce the brown paint layers of the manuscript. Analysis of the plant extract by liquid chromatography revealed that two compounds are mostly responsible for the colour, and these compounds were successfully isolated. Both contribute to the Raman spectra while only one of them is mainly responsible for the fluorescence recorded on Codex Borbonicus.

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