Patent EP0357786A1 successfully refreshed from Google Patents.
← Back to Patent Explorer
EP0357786A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for assaying antigen or antibody

Assignee: Mitsubishi Chemical Corp
•
Filing: 1989-01-27
•
Granted: —
•
Expires: 2009-01-27
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract This invention relates to (1) a method for qualitatively or quantitatively assaying an antigen or antibody contained in a liquid medium by reacting an antigen, antibody or a mixture thereof with an antibody or antigen supported on insoluble carrier particles in a liquid medium and measuring the extent of changes of the reaction product with the progress of the reaction, which comprises conducting the reaction using magnetic substance-containing insoluble carrier particles and magnetic substance-free insoluble carrier particles as the carrier particles, subjecting the reaction mixture to a magnetic field to separate agglomerated particles containing unreacted, magnetic substance-containing insoluble carrier particles and magnetic substance-containing carrier particles from the reaction mixture, and detecting remaining magnetic substance-free insoluble carrier particles, and (2) another method for qualitatively or quantitatively assaying an antigen or antibody, which comprises adding, to magnetic substance-containing insoluble carrier particles or magnetic substance-free insoluble carrier particles, a suspension sensitized by an antibody for the antigen to be assayed or by an antigen for the antibody to be assayed to react for a given time not enough for the antigen-antibody reaction to reach equilibrium, and then a suspension of magnetic substance-free insoluble carrier particles or magnetic substance-containing insoluble carrier particles: sensitized by an antibody for the antigen to be assayed or by an antigen for the antibody to be assayed to react till the antigen-antibody reaction reaches equilibrium, and subjecting the reaction mixture to a magnetic field to thereby separate agglomerated particles containing unreacted magnetic substance-containing particles and magnetic substance from magnetic substance-free insoluble carrier particles and detect remaining magnetic substance-free insoluble particles. These methods enable an antigen or antibody to be assayed rapidly and conveniently with high sensitivity.

Inventors

  • 👤 Minoru Ogura
  • 👤 Masanobu Sawai
  • 👤 Michio Ito
  • 👤 Hideki Kohno

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 19:57
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/58; G01N33/585; G01N33/53; G01N33/543; G01N33/54313; G01N33/54326; G01N33/54333; G01N33/551; G01N33/553

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 147 words
A method for the determination of an amount of an antigen or antibody comprising loading an antibody or antigen on insoluble carrier particles, reacting the loaded antibody or antigen with the antigen, antibody or their mixture in a liquid medium and measuring the degree in change of reaction product associated with the progress of the said reaction, characterized in that the antigen or antibody in the liquid medium is qualitatively or quantitatively measured by carrying out the said reaction using both insoluble carrier particles containing a magnetic substance and those not containing any magnetic substance as the above-mentioned carrier particles, subsequently by applying a magnetic field to the reaction mixture in order to separate aggregated particles comprising the magnetic substance-containing insoluble carrier particles and unreacted magnetic substance-containing insoluble carrier particles from the reaction mixture, and by detecting the remaining insoluble carrier particles not containing the magnetic substance.
Claim 2
Independent Claim 147 words
A method for the determination of an amount of an antigen or antibody comprising loading an antibody or antigen on insoluble carrier particles, reacting the loaded antibody or antigen with the antigen, antibody or their mixture in a liquid medium and measuring the degree in change of reaction product associated with the progress of the said reaction, characterized in that the antigen or antibody in the liquid medium is qualitatively or quantitatively measured by carrying out the said reaction using both insoluble carrier particles containing a magnetic substance and those not containing any magnetic substance as the above-mentioned carrier particles, subsequently by applying a magnetic field to the reaction mixture in order to separate aggregated particles comprising the magnetic substance-containing insoluble carrier particles and unreacted magnetic substance-containing insoluble carrier particles from the reaction mixture, and by detecting the remaining insoluble carrier particles not containing the magnetic substance.
Claim 3
Independent Claim 208 words
A method for the determination of an amount of an antigen or antibody wherein the antigen or antibody is qualitatively or quantitatively measured by allowing a suspension of insoluble carrier particles containing a magnetic substance or of those not containing any magnetic substance, which particles have been sensitized with an antibody for the antigen to be measured or with an antigen for the antibody to be measured, to react with the antigen or antibody to be measured in an aqueous medium for a certain time insufficient to attain the equilibrium of an antigen-antibody reaction, then by adding to the reaction mixture a suspension of the insoluble carrier particles not containing the magnetic substance or of those containing the magnetic substance, which particles have been sensitized with the antibody for the antigen to be measured or with the antigen for the antibody to be measured, by incubating the reaction mixture until the antigen-antibody reaction reaches a state of equilibrium, whereupon by applying a magnetic field to the reaction mixture in order to separate unreacted particles containing the magnetic substance and aggregated particles comprising the magnetic substance from the insoluble carrier particles not containing the magnetic substance, and by detecting the remaining insoluble carrier particles not containing the magnetic substance.
Claim 4
Independent Claim 208 words
A method for the determination of an amount of an antigen or antibody wherein the antigen or antibody is qualitatively or quantitatively measured by allowing a suspension of insoluble carrier particles containing a magnetic substance or of those not containing any magnetic substance, which particles have been sensitized with an antibody for the antigen to be measured or with an antigen for the antibody to be measured, to react with the antigen or antibody to be measured in an aqueous medium for a certain time insufficient to attain the equilibrium of an antigen-antibody reaction, then by adding to the reaction mixture a suspension of the insoluble carrier particles not containing the magnetic substance or of those containing the magnetic substance, which particles have been sensitized with the antibody for the antigen to be measured or with the antigen for the antibody to be measured, by incubating the reaction mixture until the antigen-antibody reaction reaches a state of equilibrium, whereupon by applying a magnetic field to the reaction mixture in order to separate unreacted particles containing the magnetic substance and aggregated particles comprising the magnetic substance from the insoluble carrier particles not containing the magnetic substance, and by detecting the remaining insoluble carrier particles not containing the magnetic substance.
Claim 5
Dependent Claim 36 words
A method for the determination of an amount of an antigen or antibody according to Claim 1 or 2 wherein the insoluble carrier particles containing iron and/or magnetic iron oxide as the magnetic substance are used.
Claim 6
Dependent Claim 31 words
A method for the determination of an amount of an antigen or antibody according to Claim 1, 2 or 3 wherein organic polymer material is used for the insoluble carrier particles.
Claim 7
Dependent Claim 31 words
A method for the determination of an amount of an antigen or antibody according to Claim 1, 2 or 3 wherein inorganic fine powder is used for the insoluble carrier particles.
Claim 8
Dependent Claim 30 words
A method for the determination of an amount of an antigen or antibody according to Claim 4 wherein polystyrene latex or styrene-butadiene copolymer is used for the insoluble carrier particles.
Claim 9
Dependent Claim 37 words
A method for the determination of an amount of an antigen or antibody according to Claim 5 wherein ceramic fine particles, silica, alumina, silica-alumina charcoal powder or metal fine powder is used for the insoluble carrier particles.
Claim 10
Dependent Claim 45 words
A method for the determination of an amount of an antigen or antibody according to Claim 1 or 2 wherein the insoluble carrier particles containing the magnetic substance and those not containing the magnetic substance are combined at a ratio of between 1:20 and 20:1.
Claim 11
Dependent Claim 49 words
A method for the determination of an amount of an antigen or antibody according to Claim 1 or 2 wherein the amount of the antigen or antibody in a specimen is qualitatively decided by.visual detection of the amount of the remaining insoluble carrier particles not containing the magnetic substance.
Claim 12
Dependent Claim 37 words
A method for the determination of an amount of an antigen or antibody according to Claim 1 or 2 wherein organic polymer particles comprising dye are used as the insoluble carrier particles not containing the magnetic substance.
Claim 13
Dependent Claim 31 words
A method for the determination of an amount of an antigen or antibody according to Claim 10 wherein two or more kinds of the organic polymer particles comprising dye are used.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag