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Stereoselective amino acid analysis has increasingly moved into the scope of interest of the scientific community. In this work, we report a study on the chiral recognition of d,l-Trp and d,l-His using l-Cys-capped gold nanoparticles (AuNPs) and copper(II) ion. In the l-Cys-capped AuNPs, the thiol group of the amino acid interacts with AuNPs through the formation of Au–S bond, whereas the α-amino...
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