Immunoassay for LSD and 2-oxo-3-hydroxy-LSD
The present invention provides hapten derivatives useful for the preparation of antigens, antibodies and reagents for use in immunoassays for the detection of LSD and 2-oxo-3-hydroxy LSD. In the present invention, the 2-oxy LSD nucleus is derivatized out of the indole nitrogen to form an aminoalkyl derivative. The resulting haptens can then be further modified at this functionalized position for linking to appropriate immunogenic or labeling groups to provide reagents for immunoassays having substantially equal specificity for both LSD and 2-oxo-3-hydroxy-LSD.
1. A method for determining an amount of LSD and 2-oxo-3-hydroxy-LSD in a sample suspected of containing LSD and 2-oxo-3-hydroxy-LSD, said method comprising the steps of:
forming a reaction mixture comprising said sample, an antibody having substantially equal reactivity with LSD and 2-oxo-3-hydroxy-LSD, and a conjugate comprising an LSD hapten and a detectable label under conditions favorable for binding of said antibody to said LSD, said 2-oxo-3-hydroxy-LSD, and said conjugate
measuring the amount of said conjugate bound to said antibody by measuring the amount of said detectable label on the bound conjugate,
correlating the amount of label measured with the amount of LSD and 2-oxo-3-hydroxy-LSD in the sample, wherein the said conjugate comprising an LSD hapten and a detectable label has the formula
wherein; R 1 is H and R 2 is CON(CH 2 CH 3 ) 2 R 3 is H; R 4 is a branched or straight chain linking group having 1-10 carbon atoms with 0-2 unsaturated bonds and 0-6 heteroatoms;
and R 5 is selected from the group consisting of COR 6 and NHR 7 wherein R 6 is LX and R 7 is LX, wherein L is a linking group and X is a detector.
2. The method of claim 1 wherein the correlation step is performed using a calibrator comprising a predetermined amount of LSD.