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- W2078171046 abstract "Abstract A novel method of chiral ligand‐exchange CE was developed with either L ‐ or D ‐lysine (Lys) as a chiral ligand and zinc(II) as a central ion. This type of chiral complexes was explored for the first time to efficiently separate either individual pairs of or mixed aromatic amino acid enantiomers. Using a running buffer of 5 mM ammonium acetate, 100 mM boric acid, 3 mM ZnSO 4 ·7H 2 O and 6 mM L ‐Lys at pH 7.6, unlabeled D , L ‐tryptophan, D , L ‐phenylalanine, and D , L ‐tyrosine were well separated, giving a chiral resolution of up to 7.09. The best separation was obtained at a Lys‐to‐zinc ratio of 2:1, zinc concentration of 2–4 mM and running buffer pH 7.6. The buffer pH was determined to have a strong influence on resolution, while buffer composition and concentration impacted on both the resolution and peak shape. Boric acid with some ammonium acetate was an adoptable buffer system, and some additives like ethylene diamine tetraacetic acid capable of destroying the complex should be avoided. Fine‐tuning of the chiral resolution and elution order was achieved by regulating the ratio of L ‐Lys to D ‐Lys; i.e. the resolution increased from zero to its highest value as the ratio ascended from 1:0 to 1:infinitive, and L ‐isomers eluted before or after D ‐isomers in excessive D ‐ or L ‐Lys, respectively." @default.
- W2078171046 created "2016-06-24" @default.
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- W2078171046 date "2007-07-26" @default.
- W2078171046 modified "2023-09-26" @default.
- W2078171046 title "Chiral CE of aromatic amino acids by ligand-exchange with zinc(II)–L-lysine complex" @default.
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- W2078171046 doi "https://doi.org/10.1002/elps.200600740" @default.
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