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Electrochemical identification of anthraquinone-based dyes in solid microsamples by square wave voltammetry using

A Doménech-Carbó1, M T Doménech-Carbó, M C Saurí-Peris

  • 1Departament de Química Analítica, Universitat de València, Dr Moliner 50, 46100, Burjassot, València, Spain. antonio.domenech@uv.es

Analytical and Bioanalytical Chemistry
|May 7, 2003
PubMed
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This study introduces an electrochemical technique to identify anthraquinone dyes in art microsamples. The method uses voltammetry of microparticles on composite electrodes for analyzing natural pigments.

Area of Science:

  • Analytical Chemistry
  • Art Conservation Science

Background:

  • Anthraquinone dyes are crucial colorants in historical artworks.
  • Accurate identification of these dyes aids in art conservation and authentication.
  • Microsamples from artworks require sensitive and specific analytical methods.

Purpose of the Study:

  • To develop and validate an electrochemical method for identifying anthraquinone-type dyes.
  • To analyze natural pigments commonly found in works of art.
  • To demonstrate the applicability of the voltammetry of microparticles approach.

Main Methods:

  • Utilized the voltammetry of microparticles (VMP) approach.
  • Employed graphite/polyester composite electrodes for dye analysis.
  • Performed square wave voltammetry in both organic (MeCN) and aqueous electrolytes.

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Main Results:

  • Successfully identified natural pigments including aloe, henna, cochineal red, madder lake, kermes, and shellac.
  • Alizarin and purpurin were used as reference materials and identified.
  • Distinct square wave voltammetric profiles were obtained for each dye.

Conclusions:

  • The electrochemical VMP method is effective for identifying anthraquinone dyes in art microsamples.
  • The technique offers a sensitive approach for analyzing natural pigments relevant to art conservation.
  • This method provides a valuable tool for art historical and conservation research.