Studies of magnetic properties when functionalized Fe3O4-antiCRP are associated with human C-reactive proteins for magnetic bio-sensing

Ming Chun Hsieh*, Jean Hong Chen, Yuan Fu Tong, Shu Hsien Liao

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    In this work, a highly balanced ac susceptometer was designed and implemented for magnetic immunoassays for sensing human C-reactive proteins (CRP). It is known that CRPs are used mainly as a biomarker for inflammation or acute diseases. Monitoring CRP values in blood can help medical doctors understand disease progression or the effectiveness of treatments. We characterize magnetic properties of the ac susceptometer as the human CRPs are associated with Fe3O4-antiCRP. In the design, the pickup coil and the excitation coil are positioned side-by-side with their coil axis parallel and separated at a distance of ∼1.5 cm. The pick-up coil consists of two coils wound in opposite direction with a compensation coil to improve balance. We use the Fe3O4-antiCRP-CRP magnetic clusters as the bio-target and study the effects of magnetic clustering on the changes of magnetization. The magnetic clusters are CRPs conjugated onto the Fe3O4-antiCRP and can be observed directly with SEM. The Fe3O4-antiCRP is the anti-C-reactive protein (antiCRP) coated onto dextran-coated magnetic nanoparticles (MNPs), also called the bio-functionalized magnetic nanoparticles (BMNs).

    Original languageEnglish
    Pages (from-to)1-8
    Number of pages8
    JournalSensors and Actuators, A: Physical
    Publication statusPublished - 2017 Jul 1


    • C-Reactive proteins
    • Magnetic nanoparticles
    • Pickup coil
    • Relaxation time
    • Susceptometer

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Instrumentation
    • Condensed Matter Physics
    • Surfaces, Coatings and Films
    • Metals and Alloys
    • Electrical and Electronic Engineering


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