Title of article :
Surface plasmon resonance biosensor based on Fe3O4/Au nanocomposites
Author/Authors :
Wang، نويسنده , , Jian and Sun، نويسنده , , Ying and Wang، نويسنده , , Liying and Zhu، نويسنده , , Xiaonan and Zhang، نويسنده , , Hanqi and Song، نويسنده , , Daqian، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Abstract :
In this paper, the core/shell Fe3O4/Au nanocomposites modified with 3-mercaptopropionic acid (MPA) were prepared and applied in the surface plasmon resonance (SPR) biosensor. And the detailed investigation of Fe3O4/Au nanocomposites was separately performed by UV–vis spectroscopy and transmission electronic microscopy. As the magnetic property and exceptional optical properties, the Fe3O4/Au nanocomposites were used as the solid support for the goat anti-human IgM, which could be immobilized on the surface of SPR biosensor chip by a magnetic pillar. This novel method of immobilizing goat anti-human IgM simplified experimental procedures and facilitated the regeneration of the sensing membrane. In addition, the different diameter of Fe3O4/Au nanocomposites could be obtained with the different amount of MPA in the solution. And the effect of Fe3O4/Au nanocomposites with different diameters on the sensitivity of SPR biosensor was also explored. As a result, the SPR biosensor exhibits a satisfactory response for human IgM in the concentration range of 0.30–20.00 μg ml−1 and the increasing nanocomposite diameter is in favor of the sensitivity enhancement of SPR biosensor.
Keywords :
surface plasmon resonance (SPR) , Core/shell structure , Human IgM , Fe3O4/Au nanocomposites
Journal title :
Colloids and Surfaces B Biointerfaces
Journal title :
Colloids and Surfaces B Biointerfaces