“…To date, a number of analytical methods including liquid chromatography (LC), ,− gas chromatography (GC),and capillary electrophoresis (CE) − coupled with ultraviolet (UV), fluorescence (FL), and mass spectrometric (MS) detections have been developed for the targeted chiral analysis of HAs/AAs. Besides chromatographic techniques, ion mobility-mass spectrometry (IM-MS) has also been emerged as a promising method for gas phase chiral analysis of AAs. − To achieve separation, these methods employ either chiral derivatizing reagents (CDRs) or chiral stationary phases (CSPs). Recently, Takayama and co-workers proposed an efficient LC coupled with electrospray-ionization quadrupole time-of-flight mass spectrometry (LC-ESI-QTOF/MS) strategy for chiral metabolomics using selectively synthesized CDRs for different functional groups such as (S)-1-(4,6-dimethoxy-1,3,5-triazin-2-yl)pyrrolidin-3-amine (DMT-3(S)-Apy) for carboxylic acids and (S)-2,5-dioxopyrrolidin-1-yl-1-(4,6-dimethoxy-1,3,5-triazin-2-yl) pyrrolidine-2-carboxylate (DMT-(S)-Pro-OSu) for amines. , Although this methodology provides an extremely useful tool for chiral metabolomics, the requirement of different CDRs and derivatization protocols for each class of chiral metabolites limits its suitability for analyzing patient samples due to the limited amount of sample as well as the trace levels of enantiomeric forms that are typically present.…”