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. Author manuscript; available in PMC: 2013 Jan 24.
Published in final edited form as: ACS Nano. 2011 Dec 19;6(1):512–522. doi: 10.1021/nn2038516

Figure 1.

Figure 1

Schematic illustration of the four methods for quantifying the average number of –S-PEG-NH2 chains on the surface of one single Au nanostructure: i) fluorescamine-based assay, ii) ninhydrin-based assay, iii) FITC-labeling assay, and iv) Cu2+-labeling assay.