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. 2022 Jan 6;24(1):23. doi: 10.1208/s12248-021-00669-8

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© Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, N.J., U.S.A. 2022

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Inhibition of in situ formation of NDMA during analysis by FE-SHSGC-NPD. About 30 mg metformin HCl drug substance was added to the headspace vial with 50 μL diluent containing (1) isopropanol (IPA), (2) 20 mg/mL pyrogallol (PGL) in IPA (IPA + PGL), or (3) 20 mg/mL pyrogallol and 0.1% phosphoric acid (PA) in IPA (IPA + PGL + PA)