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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Li, Jianlin Sailor, Michael J. |
| Description | Country affiliation: China Author Affiliation: Li J ( Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA); Sailor MJ ( Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA. Electronic address: msailor@ucsd.edu.) |
| Abstract | A nanoscale layer of TiO2 is coated on the inner pore walls of a porous silicon (PSi) film by room-temperature infiltration of a TiO2 sol-gel precursor and firing at 500 °C. The PSi:TiO2 composite films are characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), energy dispersive X-ray spectral analysis (EDS), scanning electron microscopy (SEM) and reflective interferometric Fourier transform spectroscopy (RIFTS). The analysis indicates that TiO2 conformally coats the inner pore surfaces of the PSi film. The film displays greater aqueous stability in the pH range 2-12 relative to a PSi:SiO2 surface. A label-free optical interference immunosensor based on the TiO2-coated PSi film is demonstrated by real-time monitoring of the physical adsorption of protein A, followed by the specific binding of rabbit anti-sheep immunoglobulin (IgG) and then specific capture of sheep IgG. The time to achieve equilibrium for the physical adsorption of protein A on the surface of TiO2-coated PSi film is significantly greater than that of PSi film. The specificity of the protein A and rabbit anti-sheep IgG construct on the sensor is confirmed by tests with non-binding chicken IgG. The sensitivity of the immunosensor is shown to be 8210 ± 170 nm/refractive index unit (RIU). |
| ISSN | 09565663 |
| Volume Number | 55 |
| e-ISSN | 18734235 |
| Journal | Biosensors and Bioelectronics |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-05-15 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Biosensing Techniques Instrumentation Coated Materials, Biocompatible Chemical Synthesis Immunoassay Immunoglobulin G Analysis Optical Devices Silicon Chemistry Titanium Animals Chickens Equipment Design Equipment Failure Analysis Immunology Porosity Refractometry Reproducibility Of Results Sensitivity And Specificity Sheep Staining And Labeling Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s. Discipline Biotechnology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology Medicine Biophysics Biomedical Engineering Biotechnology Electrochemistry |
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