Issue 2, 2003

Micro-Raman spectroscopy of natural and synthetic indigo samples

Abstract

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.

Article information

Article type
Paper
Submitted
01 Oct 2002
Accepted
10 Jan 2003
First published
20 Jan 2003

Analyst, 2003,128, 187-193

Micro-Raman spectroscopy of natural and synthetic indigo samples

P. Vandenabeele and L. Moens, Analyst, 2003, 128, 187 DOI: 10.1039/B209630G

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