• Linda A Felton, Punit P Shah, Zachary Sharp, Viorel Atudorei, and Graham S Timmins.
• Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, Albuquerque, NM, USA. lfelton@unm.edu
• Drug Dev Ind Pharm. 2011 Jan 1; 37 (1): 88-92.

PurposeCounterfeit drug products have become a major problem worldwide and a number of techniques to detect counterfeit products or reduce the potential for counterfeiting have been investigated. This study examined the use of stable isotope-labeled excipients in solid dosage forms as a method to identify drug products and to detect counterfeits.Methods(2)H- and (13)C-glucose were used as model excipients and incorporated in wet granulated formulations at a variety of different isotopic ratios. The ratios of (2)H/(1)H and (13)C/(12)C in each product were then determined by isotope ratio mass spectrometry.ResultsResults demonstrated the ability to detect the isotope-labeled glucose in both granules and tablets.ConclusionsIt was possible to use the isotope ratios to differentiate between specific batches of granules, demonstrating the potential of this technique for in-product, batch-specific identification.

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