LIPOSOME BASED HOMOGENEOUS IMMUNOASSAY FOR DIAGNOSTIC TESTS

    公开(公告)号:AU2006988A

    公开(公告)日:1989-02-02

    申请号:AU2006988

    申请日:1988-07-27

    Applicant: ABBOTT LAB

    Abstract: The present invention provides for novel homogeneous immunoassay systems involving complement-mediated lysis of marker-encapsulating lipid vesicles (liposomes) for detection of analyte in a fluid sample. Antibody sensitized liposomes (the first reagent) are sequentially incubated with an analyte-containing sample, and optionally "dummy" liposomes, which do not contain encapsulated marker, a second antibody (the second reagent), and finally with a complement source such as plasma. Complement is activated by the liposome-antibody-antigen-second antibody complex causing liposome lysis and a concomitant release of marker. Antibody of the first reagent may be an anti-analyte F(ab min )2 antibody fragment, or an anti-analyte Fab min antibody fragment. Antibody of the second reagent may be provided in either soluble form, or in insoluble form e.g., bound onto carboxylated polystyrene particles or coupled to a third antibody in the form of a "double antibody" immune precipitate. Also provided are methods for preparing antibody sensitized liposomes in the presence of a polysaccharide capable of forming a reversible gel and methods for preparing derivatized Fab min antibody fragments for coupling to lipid vesicles.

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