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. Author manuscript; available in PMC: 2023 Feb 20.
Published in final edited form as: ACS Appl Mater Interfaces. 2020 May 28;12(23):25645–25657. doi: 10.1021/acsami.0c06234

Figure 4.

Figure 4.

Size and zeta potential before/after incubation with poly-l-arginine 10 kDa (PLR10) then washing with DI water (once (1×) or twice (2×)) of (a) the electrostatically stabilized PLR10 on citrate-Au NPs (e-PLR10/Au) and (b) the covalently stabilized PLR10 on n-hydroxysuccinimide NHS-Au NPs (c-PLR10/Au). For the c-PLR10/Au NPs, the unreacted NHS groups were quenched with 0.1% bovine serum albumin (c-PLR10/Au/BSA NPs) or 5% w/v hydroxylamine (c-PLR10/Au/Hyd NPs) after 30 min of incubation.