Carotenoids produced by halophilic bacterial strains on mural paintings and laboratory conditions

壁画 保护 绘画 嗜盐菌 颜料 类胡萝卜素 拉曼光谱 化学 艺术 矿物学 生物 天体生物学 考古 细菌 食品科学 艺术史 地理 生态学 视觉艺术 光学 古生物学 物理
作者
Roxana Cojoc,Mădălin Enache,Simona Neagu,Eduard-Marius Lungulescu,Radu Setnescu,Robert Ruginescu,Ioana Gomoiu
出处
期刊:Fems Microbiology Letters [Oxford University Press]
卷期号:366 (21) 被引量:17
标识
DOI:10.1093/femsle/fnz243
摘要

ABSTRACT Due to the presence of efflorescences and improper microclimate conditions for conservation, pink-pigmented areas were reported in two historic monuments in Northern and Central part of Romania. The aims of the present study were to find the nature of pink pigments observed on the pictorial layer, original and infilling mortar, to investigate the presence of carotenoids both on mural paintings and in the isolated halophilic bacterial strains and to preliminary characterize and identify the producing strains. Their role in the aesthetical biodeterioration of historic monuments was also pointed out. Obtained Raman spectra of the pink pigments extracted both from the isolated bacterial cultures (molecularly identified as mostly related to Halobacillus hunanensis and Halobacillus naozhouensis) and from the mural painting samples contain diagnostic bands of carotenoids. These results were confirmed by FTIR spectroscopy. The strong Raman signal of bacterial carotenoids detected on mural painting indicated their potential use as biomarker molecules in the evaluation of contamination and state of conservation of mural paintings and lithic monuments. Our results contribute to opening a new direction in cultural heritage restoration to assess the conservation status on the basis of interdisciplinary research, starting with spectroscopic methods (Raman, FTIR) and confirmed by microbiological analysis.

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