Magnetic Nanoparticle Images and Assaying Biomarkers via the Magnetic Relaxation of Biofunctionalized Nanoparticles Associated with Biotargets

Li Min Wang, Tien Wei Yang*, Chih Yi Wang, Dong Shen, Jian Ming Chen, Kuen Lin Chen, Shu Hsien Liao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a novel assay of biomarkers consisting of alpha-fetaprotein (AFP) via the measurements of saturation magnetization and magnetic relaxation. The biofunctionalized magnetic nanoparticles (BMNs) were anti-alpha-fetaprotein (antiAFP) coated onto dextran-coated iron oxide nanoparticles, labeled as Fe3O4-antiAFP, and then conjugated with AFP biotargets. After a complete conjugation of AFP and Fe3O4-antiAFP, the BMNs were dried for magnetic measurements. Magnetic nanoparticle images were obtained from magnetic force microscopy with details regarding the transmission electron microscopy images. Findings show that the saturation magnetization Ms increases with a rise in the associated AFP concentration and the magnetic relaxation time τ also shows a rapid increase when the concentration of AFP is lower than 0.2 ppm. Thus, we demonstrate a sensitive platform for detecting biomarkers by characterizing Ms and τ with a sensitivity limit of 0.03-ppm AFP. The results can be attributed to the interparticle interactions and the Néel motion of magnetic moments in BMNs.

Original languageEnglish
Article number8561141
Pages (from-to)9004-9009
Number of pages6
JournalIEEE Sensors Journal
Volume19
Issue number20
DOIs
Publication statusPublished - 2019 Oct 15

Keywords

  • Alpha-fetoprotein (AFP)
  • biofunctionalized magnetic nanoparticles (BMNs)
  • magnetic relaxation
  • saturation magnetization

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Magnetic Nanoparticle Images and Assaying Biomarkers via the Magnetic Relaxation of Biofunctionalized Nanoparticles Associated with Biotargets'. Together they form a unique fingerprint.

Cite this