Micro-Raman spectroscopy of natural and synthetic indigo samples

被引:65
作者
Vandenabeele, P [1 ]
Moens, L [1 ]
机构
[1] State Univ Ghent, Analyt Chem Lab, B-9000 Ghent, Belgium
关键词
D O I
10.1039/b209630g
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
In this work indigo samples from three different sources are studied by using Raman spectroscopy: the synthetic pigment and pigments from the woad (Isatis tinctoria) and the indigo plant (Indigofera tinctoria). 21 samples were obtained from 8 suppliers; for each sample 5 Raman spectra were recorded and used for further chemometrical analysis. Principal components analysis (PCA) was performed as data reduction method before applying hierarchical cluster analysis. Linear discriminant analysis (LDA) was implemented as a non-hierarchical supervised pattern recognition method to build a classification model. In order to avoid broad-shaped interferences from the fluorescence background, the influence of 1st and 2nd derivatives on the classification was studied by using cross-validation. Although chemically identical, it is shown that Raman spectroscopy in combination with suitable chemometric methods has the potential to discriminate between synthetic and natural indigo samples.
引用
收藏
页码:187 / 193
页数:7
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