Evaluation of Raman and SERS analytical protocols in the analysis of Cape Jasmine dye (Gardenia augusta L.)

被引:24
作者
Canamares, M. V. [1 ,2 ]
Leona, M. [3 ]
Bouchard, M. [4 ]
Grzywacz, C. M. [4 ]
Wouters, J. [5 ]
Trentelman, K. [4 ]
机构
[1] CUNY City Coll, Dept Chem, New York, NY 10031 USA
[2] CUNY City Coll, CASI, New York, NY 10031 USA
[3] Metropolitan Museum Art, New York, NY 10028 USA
[4] Getty Conservat Inst, Los Angeles, CA 90049 USA
[5] Getty Conservat Inst, B-2070 Zwijindrecht, Belgium
基金
美国安德鲁·梅隆基金会; 美国国家科学基金会;
关键词
Gardenia augusta; surface-enhanced Raman scattering; dispersive Raman spectrosocpy; art and archeology; organic colorants; SURFACE-ENHANCED RAMAN; SCATTERING SERS; CROCUS SATIVUS; FT-RAMAN; IDENTIFICATION; MICROSCOPY; PIGMENT; SILVER; ADSORPTION; COLORANTS;
D O I
10.1002/jrs.2462
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
The identification of organic colorants in works of art (such as dyes on textiles or organic pigments) by Raman spectroscopy is generally limited by the presence of a strong fluorescence background. In this paper, the effectiveness of minimizing fluorescence in the analysis of Cape Jasmine (Gardenia augusta L.) by dispersive Raman spectroscopy at three different excitation wavelengths (633, 785 and 1064 nm) and by surface-enhanced Raman spectroscopy (SERS) with and without acid hydrolysis is evaluated and compared. It is shown that these vibrational techniques offer an alternative analytical approach, when, as is particularly the case of Cape Jasmine, sample preparation procedures that are routinely applied for natural organic dyes and pigments cause alterations that lead to low sensitivity in the more classical high-performance liquid chromatography-photodiode array (HPLC-PDA) analytical protocols. Samples of the yellow dye G. augusta L. in the following forms were analyzed: dyed on alum mordanted wool, dyed on nonmordanted and alum mordanted silk, pigment precipitated on hydrated aluminum oxide, extract mixed with a protein binder and painted on glass, and as a water-based glaze applied on a mock-up of a typical Chinese wall-painting. Raman bands at 1537, 1209 and 1165 cm(-1) are identified as discriminating markers for the carotenoid colorant components crocetin and crocin. Copyright (C) 2009 John Wiley & Sons, Ltd.
引用
收藏
页码:391 / 397
页数:7
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