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Analytical ultracentrifugation analysis of ultrasmall AuNPs dispersed in concentrated BSA solutions. Sedimentation coefficient distributions for (a) AuMBA, (b) AuGSHzwt, (c) AuGSHzwt@1st and (d) AuGSHzwt@10st measured in PBS (black traces) and 20 mg/mL BSA (red traces). A confidence level of 68% was used for (a), (b) and (d), while 55% was used for (c).
