Factors that affect protein adsorption on nanostructured titania films. A novel spectroelectrochemical application to sensing

被引:169
作者
Topoglidis, E
Campbell, CJ
Cass, AEG
Durrant, JR [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AY, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Biochem, London SW7 2AY, England
关键词
D O I
10.1021/la010309b
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nanoporous, thick (8 mum) films of titania (TiO2) were prepared and used for the immobilization of proteins. A detailed study has been made into the factors influencing protein adsorption on TiO2. Among these, we investigated pH, ionic strength of solution, protein surface charge, protein size, and immobilization time. Protein immobilization is found to be remarkably stable, attributed to secondary binding processes occurring after the initial immobilization. We also investigated the electrochemical properties of these films using cyclic voltammetry and spectroelectrochemistry and found that not only was direct reduction of the Fe-III-heme to Fe-II-heme of both cytochrome-c and hemoglobin possible but that all the protein in the film is electroactive. We further demonstrate the use of a hemoglobin/TiO2 film as an aerobic sensor for nitric oxide. Optical sensing is demonstrated, with a limit of detection of 1 muM.
引用
收藏
页码:7899 / 7906
页数:8
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