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. Author manuscript; available in PMC: 2015 Aug 7.
Published in final edited form as: Nanoscale. 2014 Aug 7;6(15):8873–8877. doi: 10.1039/c4nr02097a

Fig. 3.

Fig. 3

Responsiveness of the carboxylate-histidine zipper towards pH and salt concentration. Fluorescence titrations between 400 nM of AuNP-COOH and 100 nM of (a) 12×His-GFP, (b) 6×His-GFP, and (c) 1×His-GFP were performed parametrically varied pH and salt (NaCl) concentrations in 5 mM PB. The intensity of GFP released from nanoparticles was normalized against the intensity of free GFP.