Microstructure and Magnetic Properties of LaSrMnO Nanoparticles and Their Application to Cardiac Immunoassay

Woo Seung Ham, Min Kyung Kim, Ji Seok Gim, Ji Sung Lee, Jun Hua Wu, Kyu Back Lee, Young-geun Kim

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2 Citations (Scopus)


Though enzyme-linked immunosorbent assay is widely used in laboratory medicine, it has limitations due to interactions between enzymes and secondary antibodies. Here, we propose a new cardiac assay scheme for detecting troponin I antigens based on La(1-x)SrxMnO3 (x=0.10, 0.15, and 0.25) nanoparticles (NPs). These NPs are synthesized via a modified polyol process followed by heat treatment. An increase in x induces changes in crystal structure and increases both Curie temperature and saturation magnetization. The NPs with x=0.15 exhibit a Curie temperature close to the human body temperature. The limit of detection is found to be 0.78 ng/mL. We also confirm that LaSrMnO NPs are reusable after heating the assay plate.

Original languageEnglish
Article number7113860
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - 2015 Nov 1



  • Cardiac troponin I (cTnI)
  • Curie temperature
  • immunoassay
  • LaSrMnO nanoparticles (NPs)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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