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Method of and apparatus for immune analysis

  • US 5,750,410 A
  • Filed: 01/26/1996
  • Issued: 05/12/1998
  • Est. Priority Date: 08/26/1994
  • Status: Expired due to Term
First Claim
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1. A method for quantitatively determining a target antigen or a target antibody in a liquid sample in an immunoassay, comprising:

  • (a) reacting said liquid sample with a solution comprising an antibody or antigen labelled with a colloidal noble metal particle, wherein said antibody or antigen specifically binds to said target antigen or said target antibody, respectively, to form a liquid sample/solution mixture containing a labelled immune complex;

    (b) contacting said liquid sample/solution mixture with a total reflection cell having a surface comprising a total reflection prism;

    (c) illuminating said total reflection prism with a measuring beam of light having a wavelength in a range of visible to infrared light at an angle of incidence which causes total reflection at an interface between said total reflection prism and said liquid sample/solution mixture in said total reflection cell;

    (d) measuring absorption of said measuring beam at the interface; and

    (e) comparing said measured absorption to a standard absorption obtained from a known concentration of said target antigen or said target antibody processed according to steps (a)-(d) to determine the amount of said target antigen or said target antibody in said liquid sample.

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