Bioassay using blocking temperature: Interparticle interactions between biofunctionalized magnetic nanoparticles conjugated with biotargets

C. Y. Wang, T. W. Yang, D. Shen, K. L. Chen, J. M. Chen, S. H. Liao, J. J. Chieh, H. C. Yang, L. M. Wang

研究成果: 雜誌貢獻文章

2 引文 斯高帕斯(Scopus)


This paper reports a bioassay of alpha-fetoprotein (AFP) concentration achieved via the measurement of blocking temperature (TB). Biofunctionalized magnetic nanoparticles (BMNs) consisting of anti-alpha-fetoprotein coated onto dextran-coated magnetic nanoparticles composed of Fe3O4 were prepared and then conjugated with AFP biotargets. It was found that both the saturation magnetization and value of TB increased with the concentration of the associated AFP. Furthermore, the dependence of TB of the samples on magnetic field agreed with the interparticle interaction model. Thus, this study demonstrated a platform to detect biomarkers by characterizing TB with a sensitivity limit of 20 ppb of AFP. The promising results obtained for this bioassay can be attributed to the interparticle interactions and Néel motions of magnetic moments in the BMNs.

期刊Applied Physics Letters
出版狀態已發佈 - 2017 三月 27


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)