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Using two kinds of central metal ions in a background electrolyte, ligand exchange CE was investigated for the simultaneous enantioseparation of dl‐malic, dl‐tartaric, and dl‐isocitric acids. Ligand exchange CE with 100 mM d‐quinic acid as a chiral selector ligand and 10 mM Cu(II) ion as a central metal ion could enantioseparate dl‐tartaric acid but not dl‐malic acid or dl‐isocitric acid. A dual central...
Lipoic acid, an antioxidant, naturally occurs as the (R)‐enantiomer, while synthetic lipoic acid is racemic. It is thus of interest to know the (R)‐enantiomer content of lipoic acid supplements. Here, we used capillary electrophoresis to directly enantioseparate lipoic acid in dietary supplements by using a sulfonated capillary with an effective voltage of +18 kV and direct detection at 200 nm. Factors...
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