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. Author manuscript; available in PMC: 2011 Jun 1.
Published in final edited form as: Biomaterials. 2010 Mar 25;31(18):4987–4994. doi: 10.1016/j.biomaterials.2010.02.063

Figure 1. The surface of polyketal microparticles can be modified with nitrilotriacetic acid (NTA) to bind His6-tagged proteins.

Figure 1

(A) A cartoon depicting NTA-lipid conjugate added to polyketal microparticles for surface modification. (B) SEM micrograph of NTA-functionalized microparticles. (C) Fluorescence micrograph of NTA polyketal microparticles that were incubated with phosphate buffered saline (PBS) prior to His6-tagged green fluorescent protein (GFP). Microparticles showed little green fluorescence. (D) Fluorescence micrograph of Ni+2-loaded NTA microparticles showed strong green fluorescence after incubation with His6-tagged GFP. (all scale bars 20 μm.)