Ultra-high performance liquid chromatography–tandem mass spectrometry for profiling mercapturic acids in human urine after daily exposure to acrylamide, 3-monochloropropane-1,2-diol and glycidol

The mercapturic acids are critical urinary biomarkers for evaluating the short-term exposure to typical food processing contaminants <i>in vivo</i>. However, limited studies have focused on methodological supports for biomonitoring the internal exposure to these multiple contaminants. Here, we developed a reliable method for the simultaneous determination of five mercapturic acids originating from acrylamide, 3-monochloropropane-1,2-diol (3-MCPD), and glycidol by ultra-high performance liquid chromatography-tandem mass spectrometry. The limits of quantification of the five analytes ranged from 0.3 to 0.9 ng mL^-1, while the recovery rates were measured to be 102-119%, 107-118%, and 105-111% at low, intermediate, and high spiking levels of analyte standards, respectively. Chromatographic separation at the baseline level and a rapid run time (7 min per sample) for all mercapturic acids also supported the current effective analysis. We enrolled 408 Chinese participants (203 male and 205 female) who had not been served with special diets before and collected their urine samples in the morning after overnight fasting. The urinary concentrations of mercapturic acids were associated with typical demographic characteristics of the participants, including sex, age, body mass index, and smoking status. The current method was successfully used for biomonitoring urinary metabolites from daily exposure to acrylamide, 3-MCPD and glycidol among Chinese participants.