Journal
NANOTECHNOLOGY
Volume 25, Issue 16, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/16/165701
Keywords
mesoporous materials; nanocasting hard templating approach; NiO; streptavidin protein
Funding
- University of Queensland [RM 2010001818]
- ARC Centre for Functional Nanomaterials, AIBN. UQ
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A simple and efficient immobilization of streptavidin protein (with hexa-histidine tag) onto the surface of mesoporous NiO is described. Before immobilization of streptavidin protein (with hexa-histidine tag) onto the surface of mesoporous NiO, we first synthesized well-organized mesoporous NiO by a nanocasting method using mesoporous silica SBA-15 as the hard template. Then, the well-organized mesoporous NiO particles were characterized by small angle x-ray diffraction (XRD), wide angle XRD, nitrogen adsorption/desorption, and transmission electron microscopy (TEM). TEM and small angle XRD suggested the formation of mesoporous NiO materials, whereas the wide angle XRD pattern of mesoporous NiO indicated that the nickel precursor had been transformed into crystalline NiO. The N-2 sorption experiments demonstrated that the mesoporous NiO particles had a high surface area of 281 m(2) g (-1), a pore volume of 0 : 51 cm(3) g (-1) and a pore size of 4.8 nm. Next, the immobilization of streptavidin protein (with hexa-histidine tag) onto the surface of mesoporous NiO was studied. Detailed analysis using gel electrophoresis confirmed that this approach can efficiently bind his-tagged streptavidin onto the surface of mesoporous NiO material since the mesoporous NiO provides sufficient surface sites for the binding of streptavidin via non-covalent ligand binding with the histidine tag.
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