Magnetic nanoparticle images and assaying biomarkers via the magnetic relaxation of biofunctionalized nanoparticles associated with biotargets

Research output: Contribution to journalArticle

Abstract

This research 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 conjugating of AFP and Fe3O4-antiAFP, the BMNs were dried for magnetic measurements. Magnetic nanoparticle images were obtained from magnetic force microscopy (MFM) with details regarding the transmission electron microscopy (TEM) images. Findings show that the saturation magnetization Ms increases with a rise in the associated AFP concentration, and that 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 statusAccepted/In press - 2018 Jan 1

Fingerprint

assaying
Magnetic relaxation
biomarkers
magnetic relaxation
Biomarkers
Nanoparticles
nanoparticles
Saturation magnetization
Magnetic force microscopy
saturation
magnetization
dextrans
Dextran
magnetic force microscopy
Magnetic variables measurement
Magnetic moments
Iron oxides
iron oxides
Relaxation time
magnetic measurement

Keywords

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

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

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title = "Magnetic nanoparticle images and assaying biomarkers via the magnetic relaxation of biofunctionalized nanoparticles associated with biotargets",
abstract = "This research 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 conjugating of AFP and Fe3O4-antiAFP, the BMNs were dried for magnetic measurements. Magnetic nanoparticle images were obtained from magnetic force microscopy (MFM) with details regarding the transmission electron microscopy (TEM) images. Findings show that the saturation magnetization Ms increases with a rise in the associated AFP concentration, and that 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 N{\'e}el motion of magnetic moments in BMNs.",
keywords = "alpha-fetoprotein (AFP), biofunctionalized magnetic nanoparticles (BMNs), magnetic relaxation, saturation magnetization",
author = "M. Wang and Yang, {T. W.} and Wang, {C. Y.} and D. Shen and Chen, {J. M.} and Chen, {K. L.} and Liao, {S. H.}",
year = "2018",
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AU - Wang, M.

AU - Yang, T. W.

AU - Wang, C. Y.

AU - Shen, D.

AU - Chen, J. M.

AU - Chen, K. L.

AU - Liao, S. H.

PY - 2018/1/1

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N2 - This research 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 conjugating of AFP and Fe3O4-antiAFP, the BMNs were dried for magnetic measurements. Magnetic nanoparticle images were obtained from magnetic force microscopy (MFM) with details regarding the transmission electron microscopy (TEM) images. Findings show that the saturation magnetization Ms increases with a rise in the associated AFP concentration, and that 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.

AB - This research 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 conjugating of AFP and Fe3O4-antiAFP, the BMNs were dried for magnetic measurements. Magnetic nanoparticle images were obtained from magnetic force microscopy (MFM) with details regarding the transmission electron microscopy (TEM) images. Findings show that the saturation magnetization Ms increases with a rise in the associated AFP concentration, and that 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.

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KW - saturation magnetization

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