Comparison of polarimetry and crown ether-based HPLC chiral stationary phase method to determine (l)-amino acid optical purity

Simultaneous quantitation of nine kinds of (d)- and (l)-amino acid enantiomers by HPLC-MS/MS: application to the quality control of amino acid tablets

“…Therefore this resulted in poor correlation between amino acid titration data and content data of (L)-amino acid. 7 Analytical methods based on high performance liquid chromatography (HPLC), 8,9 capillary electrophoresis, 10,11 enzymatic 12 and immunochemical biosensors, 13 etc. were reported.…”