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Cysteine-mediated gold nanoparticle aggregation. TEM of AuNPs incubated for 5 min in (a) 10% v/v DPBS or (b) 10% v/v DPBS spiked with 5 μM cysteine. Scale bar 100 nm. (c) Photographs of wells containing (i) AuNPs in DPBS or (ii) AuNPs in DPBS spiked with 5 μM cysteine. (d) Representative absorbance spectra of AuNP incubated for 15 min in DPBS or DPBS spiked with 0.01 to 5 μM cysteine. Characteristic emergence of a broad peak at around 660 nm is observed.
