In-vivo and fast examination of iron concentration of magnetic nano-particles in an animal torso via scanning SQUID biosusceptometry

W. K. Tseng, J. J. Chieh, S. Y. Yang, H. E. Horng, C. Y. Hong, H. C. Yang, C. C. Wu

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


To determine the iron concentration of administrated magnetic nano-particles in animals is essential for evaluation of arrival efficiency in target regions in biomagnetism studies. In this work, a high Tc superconucting quantum interference devices (SQUID) biosusceptometry with a scanning coil set is developed. The measurement principal is based on the AC susceptibility of magnetic nano-particles, and the low noise of 8 pT/√Hz at 400 Hz is characterized in unshielded environment. The dextran-coated magnetic nano-particle of 50 nm in diameter is administrated intravenously into Wistar male rats to demonstrate the in-vivo and fast examination feasibility of this instrument. The in-vivo results of heart region and liver region explained the reasonable biological phenomenon of magnetic nano-particles in animals. Good correlation of concentration-time curve between the induction-coupled-plasma (ICP) and in-vivo examination by AC susceptibility measurement in rat liver region until 4 hours after injection of magnetic naoparticle validates the in-vivo measurement of iron concentration. After 4 hrs post magnetic nanoparticle injection, the phagocyted magnetic nano-particles in liver tissue shows antiferromagnetism properties and explain the difference between the low in-vivo intensity by AC susceptibility measurement and high intensity by ICP.

Original languageEnglish
Article number5721748
Pages (from-to)2250-2253
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number3 PART 2
Publication statusPublished - 2011 Jun


  • Antiferromagnetism
  • In-vivo
  • Magnetic nano-particle

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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