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Schematic representation of different Au NP capping agents. a NP obtained by synthesis A or B (named Au-C and Au-TC, respectively): spherical gold core surrounded by citrate ligands. b NP obtained by synthesis C (named Au-CYS): the gold core can link to the thiol groups on the CYS molecule. c NP obtained by synthesis D (named Au-GSH): the gold core is bound to GSH thiol groups
