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Analytical ultracentrifugation analysis of AuMBA-2.0 and AuGSH-2.0 in PBS supplemented with FBS. (a) Serum protein associations with AuMBA-2.0 and some nanoparticle aggregation are observed (see text for details). (b) Extensive precipitation of AuGSH-2.0 is observed. Black, AuNPs in PBS; red, AuNPs in 10% FBS-PBS.
