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. 2015 Dec 1;5:17040. doi: 10.1038/srep17040

Figure 1. Amination control.

Figure 1

(a). Representative NP dissolution NMR corresponding to chosen amine surface densities labelled H, M, L and VL (b). Ninhydrin assay measurement of no. of surface amines across precursor concentration range in optimal amination conditions (“natural” pH with thermal treatment). Red stars indicate the chosen surface densities with corresponding NMR surface measurements (All Ninhydrin and NMR averaged from minimum of three independently synthesized batches) (c). Representative zeta potential–pH titrations for chosen surface densities.