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Combined Fourier-transform infrared imaging and desorption electrospray-ionization linear ion-trap mass spectrometry for analysis of counterfeit antimalarial tablets

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Abstract

This paper reports use of a combination of Fourier-transform infrared (FTIR) spectroscopic imaging and desorption electrospray ionization linear ion-trap mass spectrometry (DESI MS) for characterization of counterfeit pharmaceutical tablets. The counterfeit artesunate antimalarial tablets were analyzed by both techniques. The results obtained revealed the ability of FTIR imaging in non-destructive micro-attenuated total reflection (ATR) mode to detect the distribution of all components in the tablet, the identities of which were confirmed by DESI MS. Chemical images of the tablets were obtained with high spatial resolution. The FTIR spectroscopic imaging method affords inherent chemical specificity with rapid acquisition of data. DESI MS enables high-sensitivity detection of trace organic compounds. Combination of these two orthogonal surface-characterization methods has great potential for detection and analysis of counterfeit tablets in the open air and without sample preparation.

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Acknowledgements

We thank EPSRC for support (Grant EP/C532678/1). L.N. thanks the US Pharmacopeia for a scholarship that supports his participation in this project. FMF thanks the Society of Analytical Chemists of Pittsburgh for a starter grant. We thank all those who collected samples, the Food and Drug Department and Food and Drug Quality Control Centre of the Ministry of Health, Lao PDR. The collection of samples was funded by the British Embassy, Bangkok, and the Wellcome Trust (UK). We thank Professors Nicholas White and Nicholas Day for their help.

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Authors and Affiliations

  1. Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK

    Camilla Ricci & Sergei G. Kazarian

  2. School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    Leonard Nyadong & Facundo M. Fernandez

  3. Wellcome Trust-Mahosot Hospital-Oxford Tropical Medicine Research Collaboration, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos

    Paul N. Newton

  4. Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford University, Oxford, OX3 7LJ, UK

    Paul N. Newton

Authors
  1. Camilla Ricci
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  2. Leonard Nyadong
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  3. Facundo M. Fernandez
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  4. Paul N. Newton
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  5. Sergei G. Kazarian
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Corresponding author

Correspondence to Sergei G. Kazarian.

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Ricci, C., Nyadong, L., Fernandez, F.M. et al. Combined Fourier-transform infrared imaging and desorption electrospray-ionization linear ion-trap mass spectrometry for analysis of counterfeit antimalarial tablets. Anal Bioanal Chem 387, 551–559 (2007). https://doi.org/10.1007/s00216-006-0950-z

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  • DOI: https://doi.org/10.1007/s00216-006-0950-z

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