Liquid-phase detection of biological targets with magnetic markers

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We have developed a liquid-phase immunoassay technique using Brownian relaxation of magnetic markers. First, we quantitatively characterized the properties of the magnetic markers in order to find the markers suitable for the application. Next, we developed a detection method using large polymer beads to fix the biological targets, where bound and free markers were magnetically distinguished using the difference in their Brownian relaxation. Therefore, we can omit a time consuming washing process called bound/free separation. We also developed a detection system using high Tc SQUID sensor, and demonstrated the high sensitivity detection of biological targets called biotins.