Detection of magnetic nanoparticles with superconducting quantum interference device (SQUID) magnetometer and application to immunoassays

被引：126

作者：

Enpuku, K ^{[1
]}

Minotani, T

Gima, T

Kuroki, Y

Itoh, Y

Yamashita, M

Katakura, Y

Kuhara, S

机构：

[1] Kyushu Univ, Dept Elect Device Engn, Higashi Ku, Fukuoka 8128581, Japan

[2] Kyushu Univ, Grad Sch Genet Resources Technol, Fukuoka 8128581, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 1999年 / 38卷 / 10A期

关键词：

SQUID magnetometer; magnetic nanoparticle; magnetization; antigen-antibody reaction; immunoassay; high T-c superconductor;

D O I：

10.1143/JJAP.38.L1102

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A system is developed to magnetically measure biological antigen-antibody reactions with a superconducting quantum interference device (SQUID) magnetometer. In this system, antibodies are labeled with magnetic nanoparticles of g-Fe2O3, and the antigen-antibody reactions are measured by detecting the magnetic field from the magnetic nanoparticles. A setup of the system is described, and the sensitivity of the system is studied in terms of detectable weight of nanoparticles. Magnetic particles as small as 600 pg can be detected at present. An experiment is also conducted to measure antigen-antibody reaction with the present system. It is shown that the sensitivity of the present system is better than that of the conventional optical method. A one order of magnitude improvement of sensitivity will be realized by the sophistication of the present system.

引用

页码：L1102 / L1105

页数：4

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