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Method of determining energy transfer efficiency of a donor-acceptor pair of fluorescent dyes

  • US 5,237,515 A
  • Filed: 04/10/1991
  • Issued: 08/17/1993
  • Est. Priority Date: 04/10/1991
  • Status: Expired due to Fees
First Claim
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1. A method of determining the energy transfer efficiency of a donor-acceptor pair of fluorescent dyes useful in fluorescent energy transfer immunoassay which comprises:

  • (a) measuring the fluorescence and absorption spectra of donor-protein, acceptor-protein, mixture of donor-protein and acceptor-protein and donor-acceptor-protein conjugates;

    (b) separating the respective spectra measured in (a) into their respective donor-protein complex and acceptor-protein complex components using multiple linear regression and employing models
    
    
    space="preserve" listing-type="equation">F.sub.a-d =α

    ·

    F.sub.d +β

    ·

    F.sub.a +ε

    and
    
    
    space="preserve" listing-type="equation">A.sub.a-d =α

    '"'"'·

    A.sub.d +β

    '"'"'·

    A.sub.a +ε

    '"'"' where Fd, Fa, and Fa-d are the fluorescence spectra of the donor-protein conjugate, the acceptor-protein conjugate, and the donor-acceptor-protein conjugate, respectively, α and

    β

    are the linear coefficients to be determined and ε

    is the error term and Ad, Aa, and Aa-d are the absorption spectra of the donor-protein conjugate, the acceptor-protein conjugate, and the donor-acceptor-protein conjugate, respectively, α

    '"'"' and β

    '"'"' are the linear coefficients to be determined and ε

    '"'"' is the error term; and

    (c) determining the energy transfer efficiency on the basis of quenching of donor fluorescence using the equation ##EQU2## where E is energy transfer efficiency, Fd is the fluorescence intensity of donor in the absence of acceptor, Ad is the absorbance of donor in the absence of acceptor, Fad is the fluorescence intensity of the donor in the presence of acceptor, and Aad is the absorbance of donor in the presence of acceptor.

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