Abstract
This communication describes the synthesis and structure of multilayered protein nanotubes bearing a magnetite (Fe3O4) surface exterior, and their binding capability for zinc(II)‐protoporphyrin IX (ZnPP) in aqueous medium. The nanotubes were fabricated using an alternating layer‐by‐layer (LbL) assembly of human serum albumin (HSA) and poly‐L‐arginine (PLA) in a track‐etched polycarbonate (PC) membrane (pore size, 400 nm), which had been precoated in advance with Fe3O4 nanoparticles. Dissolution of the PC template yielded Fe3O4(PLA/HSA)3 nanotubes. SEM measurements revealed the formation of uniform hollow cylinders with 417 ± 16 nm outer diameter and 56 ± 7 nm wall thickness. TEM observations confirmed the homogeneous outer surface of Fe3O4. In an aqueous medium, the nanotubes captured ZnPP into the swollen wall. The ZnPP‐loaded protein nanotubes were collected by exposure to a magnetic field. Copyright © 2011 John Wiley & Sons, Ltd.
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