# US 7,410,811 B2 · Analytical method and device utilizing magnetic materials

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- Number: US 7,410,811 B2
- Document ID: US7410811B2
- Status: Granted
- Kind: B2
- Application number: 11/320,659
- Filed: 2005-12-30
- Published: 2006-12-21
- Granted: 2008-08-12
- Earliest claimed: 2005-06-21
- Assignees: Industrial Technology Research Institute
- Inventors: Yuh Jiuan Lin; Kun Feng Lee; Chi Min Chau; Hui Ju Cho
- Web page: https://patentgrep.com/patent/US7410811B2

## CPC

- G01N 33/54326: {Magnetic particles}
- G01N 33/54373: {involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings}
- Y10S 436/805: Optical property
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The present invention relates to an analytical method and device utilizing magnetic materials and acoustics sensor. The invention employs a magnetic material modified with specific recognizable molecules to capture a substance in a sample and provides an external magnetic field to draw the magnetic material to an sensing region of an acoustics sensor, and then converts an effect occurred on a surface of the sensing region to an amount of the substance in the sample, wherein the effect is caused by a contact of the surface with the magnetic material and the substance.

## Claims

### Claim 1

A method for analyzing a target substance in a sample, comprising the steps of:
a) providing a magnetic material having its surface modified with recognizable molecules to capture a target substance in a sample;
b) adding the magnetic material to the sample for the recognizable molecules thereon to capture the target substance in the sample;
c) using a magnetic field to draw the magnetic material to the surface of an sensing region of an acoustics sensor to produce an acoustic effect thereon, wherein said surface of the sensing region has been modified with substances which can prevent non-specific binding; and
d) converting the acoustic effect into the amount of the target substance in the sample.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the magnetic material includes magnetic particles, magnetic nanoparticles or superparamagnetic nanoparticles.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the recognizable molecules include compound, antigen, antibody, receptor, ligand, enzyme, protein, peptide, or nucleic acid.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the acoustic sensor includes quartz crystal microbalance (QCM), surface acoustic wave device, flexural plate wave sensor, acoustic plate mode device, or micro/nano cantilever beam.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the acoustic effect includes changes in deformation, changes in resonance frequency shift, or changes in acoustic wave signal.

### Claim 6 (depends on 1)

The method according to claim 1, further comprising the use of an optical sensor to detect the magnetic material.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the surface of magnetic material further contains signal molecules having the properties of light absorption, fluorescence emission, phosphorescence emission, or luminescence emission.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the surface of magnetic material further contains signal molecules having the properties of light absorption, fluorescence emission, phosphorescence emission, or luminescence emission.

### Claim 9 (depends on 2)

The method according to claim 2, wherein the recognizable molecules include compound, antigen, antibody, receptor, ligand, enzyme, protein, peptide, or nucleic acid.