2957052 UPLC-ToF-MS Ultra-performance liquid chromatography combined with time-of-flight mass spectrometry 4 572945 UPLC-HR-TOFMS ultra-performance liquid chromatography with high-resolution time-of-flight mass spectrometry 2 572947 UPLC-HRTOF-MS ultra-performance liquid chromatography with high-resolution time-of-flight mass spectrometry 1