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Nanoparticle characterization. (a) Structure of glutathione monoethyl ester (GSHzwt). GSHzwt is a zwitterionic derivative of glutathione having an ethylated C-terminus. (b) AuNP characterization by dark-field scanning-transmission electron microscopy. Nanoparticles are approximately 2 nm in core diameter. Scale bar, 20 nm. (c) AuNP characterization by UV-visible spectroscopy. (d) AuNP characterization by analytical ultracentrifugation (colors as in (c)).
