title: Determination of amino acid enantiomers by two-column gas chromatography with valveless column switching.
mesh_terms: D000596:Amino Acids / Q000097:blood / Q000302:isolation & purification*; D002849:Chromatography, Gas / Q000295:instrumentation; D005260:Female; D006801:Humans; D007536:Isomerism; D011247:Pregnancy
chemical_list: D000596:Amino Acids