Kinetics and Distribution of Zearalenone-14-Glucoside and Its Metabolite Zearalenone in Rat, Determined by a Reliable HPLC-MS/MS Method

A reliable high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was established for the simultaneous detection of zearalenone-14-glucoside (ZEN-14G) and its metabolite, zearalenone (ZEN), in the plasma, urine, and various tissues of rats. The performance of the developed method was validated by determining the selectivity, linearity (R-2 > 0.99), sensitivity (lower limit of quantification, 0.1-1 mu g/L), recovery (80.7 +/- 3.0-112.3 +/- 3.1%), precision (0.6-16.5%), and stability (81.7 +/- 1.7-104.1 +/- 3.9%). Through use of the methodological advances, the subsequent kinetics and distribution after administration of ZEN-14G by gavage were thoroughly investigated. ZEN-14G and ZEN exhibited similar trends in the plasma, and reached their peak concentrations at 10 min and then rapidly decreased. ZEN-14G could be quantified in the stomach, small intestine, and large intestine 24 h after administration, while ZEN was detectable in all tested tissues. Interestingly, ZEN-14G (7.6 +/- 3.0 mu g/L) and ZEN (977.5 +/- 98.0 mu g/L) were also detected in the urine 24 h after administration, indicating that ZEN-14G was prone to be slowly and continuously hydrolyzed into ZEN to be absorbed into the plasma and distributed to various tissues, thus leading to a cumulative exposure. Continuous attention should be paid to the co-exposure of ZEN and ZEN-14G, which might pose additional health risks to humans and animals.

Automated summary

A reliable HPLC-MS/MS method was established for simultaneous detection of ZEN-14G and ZEN in rats. The method showed good selectivity, linearity, sensitivity, recovery, precision, and stability. The study revealed the kinetic and distribution profiles of ZEN-14G and ZEN in plasma, urine, and various tissues of rats after oral administration of ZEN-14G. Continuous attention should be paid to the co-exposure of ZEN and ZEN-14G due to their potential health risks.