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Updated: Apr 16, 2026
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Radiosynthesis of 1-2-[18F]Fluoroethyl-L-Tryptophan using a One-pot, Two-step Protocol
Published on: September 21, 2021
Application of HPLC mixed-mode chromatography in determining radiochemical purity of [(14) C] labeled metformin
Van Truong1, Roy Helmy, Sumei Ren
1Analytical and Process Chemistry, Merck Research Laboratories, Rahway, NJ, 07065, USA.
Abstract:
Metformin is currently prescribed worldwide to treat type 2 diabetes, and therefore, radiolabeled [(14) C] metformin is often prepared for clinical comparisons of new drug candidates. Prior to using the radiolabeled metformin, the purity needs to be determined to ensure the quality of the material. While typical reversed-phase LC methods are often the first choice for purity analysis, they are not suitable for this determination because the compound is poorly retained under these conditions. Mixed-mode chromatography has been demonstrated to overcome these retention issues, and therefore, this methodology was utilized for the purity determination of radiolabeled metformin.
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