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Magnetic fine particles having lower critical solution temperature

a technology of critical solution temperature and magnetic fine particles, which is applied in the field of magnetic fine particles having a lower critical solution temperature, can solve problems such as poor versatility

Inactive Publication Date: 2005-07-21
FURUKAWA HIROTAKA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides magnetic fine particles that can be used as separating agents and have a lower critical solution temperature. These particles can be immobilized with various substances such as biotin, avidin, enzymes, antibodies, nucleic acids, and proteins. The particles can be used for separation, concentration, modification, and detection of biological substances. The invention also provides a method for detecting nucleic acids using magnetic fine particles. The particles have a unique property of binding to a substance through a polymer having a lower critical solution temperature, which makes them versatile in uses.

Problems solved by technology

As described above, in the conventional technology, the usefulness of the magnetic fine particles having an LCST is recognized in the field of separating agents and the like, but there is a problem of poor versatility.

Method used

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  • Magnetic fine particles having lower critical solution temperature
  • Magnetic fine particles having lower critical solution temperature
  • Magnetic fine particles having lower critical solution temperature

Examples

Experimental program
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Effect test

example 1

Preparation of Magnetic Fine Particles

[0074] Magnetic fine particles are prepared according to the following method.

[0075] In a 1 L flask, 83.4 g of ferrous sulfate (heptahydrate) and 10.4 g of sodium nitrite were thoroughly mixed with 500 ml of distilled water, followed by 20 minutes of stirring at 40° C. Thereafter, 125 ml of concentrated ammonia was added thereto and insoluble matter was collected and washed twice with distilled water to obtain magnetite. The resulting magnetite was added to 500 ml of distilled water in a 1 L flask and the temperature of the solution was raised to 80° C. Then, 7.5 g of sodium oleate was added thereto, followed by 20 minutes of stirring at the same temperature. Thereafter, pH of the solution was adjusted to 5.5 and the resulting insoluble matter was collected by filtration and washed twice with distilled water to obtain magnetite having an oleic acid layer. The magnetite was again added into a 1 L flask, 500 ml of distilled water was added, and ...

example 2

Preparation of LCST Magnetic Fine Particles

[0076] Using the above magnetic fine particles, LCST magnetic fine particles were prepared according to the following method.

[0077] Into a 300 ml flask were added 4 ml of the magnetic fine particles prepared in Example 1, 0.488 g of N-isopropylacrylamide, 12.7 mg of N-biotinyl-N′-methacryloyltrimethyleneamide, and 94 ml of distilled water, followed by thorough stirring at room temperature. Thereto was added 0.1 g of potassium persulfate, followed by 6 hours of stirring at room temperature. The resulting solution was dialyzed for one day and night to obtain a solution of LCST magnetic fine particles to which biotin was immobilized.

[0078] The lower critical solution temperature (LCST) of the resulting solution was measured to be 31° C. The LCST hardly changed in a physiological saline and in 100 mM phosphate buffer (pH 7.0). In this connection, the LCST was measured using transmittance of visible light.

example 3

Separation of Avidin from Aqueous Solution

[0079] In a test tube, 50 μl of the solution of LCST magnetic fine particles obtained in Example 2, 50 μl of 1.0% avidin solution, 100 μl of 1.0 M sodium phosphate buffer (pH 7.0), and 800 μl of distilled water were thoroughly mixed and then the temperature of the solution was raised to 31° C. or higher. The aggregate was recovered with neodi-magnet (4300 G), and 100 μl of the supernatant was taken out and subjected to denaturation treatment with sodium dodecyl sulfate (SOS). Then, disappearance of the band corresponding to avidin in the supernatant was confirmed by SDS-polyacrylamide gel electrophoresis (SDS-PAGE).

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Abstract

The present invention relates to magnetic fine particles having a lower critical solution temperature to which at least one substance selected from biotin and avidin is immobilized, and a method of converting a substance, a method of separating or concentrating a microorganism, a method of modifying a denatured protein, a method of detecting a nucleic acid, a separating agent, and a method of separating a biological substance using the same.

Description

TECHNICAL FIELD [0001] The present invention relates to magnetic fine particles having a lower critical solution temperature, and a method of converting a substance, a method of separating or concentrating a microorganism, a method of modifying a denatured protein, a method of detecting a nucleic acid, a separating agent, and a method of separating a biological substance, each using the magnetic fine particles. BACKGROUND ART [0002] As described in Clin. Microbiol. Rev., 1994, pp. 43-54, there are many attempts to separate a variety of biological molecules and microorganisms by immobilizing antibodies or pairing bases to magnetic fine particles. As the magnetic fine particles for use in these methods, those having a particle size of 1 μm or more are usually used in consideration of the time for recovering them with a magnet. However, since the surface area decreases as the particle size increases, the efficiency is a big problem in the case that a small molecule such as a protein or...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07D495/04C07K17/14C12N11/14C12N15/10G01N33/543
CPCC07D495/04C07K17/14C12N11/14G01N2446/86G01N33/5434G01N2333/255C12N15/1013
Inventor FURUKAWA, HIROTAKAOHNISHI, NORIYUKIKATAOKAUENO, KATSUHIKO
Owner FURUKAWA HIROTAKA
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