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• W1967319380 endingPage "35" @default.
• W1967319380 startingPage "30" @default.
• W1967319380 abstract "Stereoselective amino acid analysis is still a challenging task. In this work, we report a study on the chiral recognition of d,l-Trp and d,l-His using l-Cys capped silver nanoparticles (AgNPs) and copper(II) ion. The AgNPs have been characterized by TEM, UV–Vis spectra and dynamic light scattering (DLS) measurements and used for chiral discrimination. In the l-Cys capped AgNPs, the α-amino and α-carboxyl groups of the surface-confined amino acid, besides showing either a negative or a neutral charge as a function of the pH, can coordinate the copper(II) ion, which in turn, binds the l- or d-amino acid present in solution forming diastereoisomeric complexes. The resulting systems have been characterized by UV–Vis spectroscopy, exploiting the zwitterionic nature of the cysteine to obtain enantiodiscrimination by a fine tuning of the pH. The analysis of the UV–Vis data by using a multiwavelength approach allows us to determine the kinetic constants ruling the processes." @default.
• W1967319380 created "2016-06-24" @default.
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• W1967319380 date "2015-04-01" @default.
• W1967319380 modified "2023-09-27" @default.
• W1967319380 title "Fine tuning the pH triggers the enantiorecognition of underivatized amino acids by silver nanoparticles: A novel approach based on the focused use of solution equilibria" @default.
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• W1967319380 doi "https://doi.org/10.1016/j.jcis.2014.11.067" @default.
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