Metformin is the first-line medicine for the treatment of type 2 diabetes. Drug interactions\nbetween metformin and other drugs, food, or beverages cannot only cause changes in the\npharmacokinetic profiles but also affect the efficacy of metformin. The purpose of this study was to\ndevelop a rapid and reliable bioanalytical method for the detection of plasma metformin concentration\nin humans. To remove interfering substances in plasma, acidified acetonitrile (acetonitrile containing\n0.1% formic acid) was added to samples. Ultra-high-performance liquid chromatography (UHPLC)\ncoupled with high resolution mass spectrometry (HRMS) was used to analyze metformin and its\ninternal standard (metformin-d6). Analyte separation was performed on a BEH HILIC analytical\ncolumn..............................
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