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  • Title: ELISA for the detection of anticardiolipin antibodies. High specificity based on the use of adult bovine serum as buffer and systematic subtraction of non-specific binding.
    Author: Rupin A, Gruel Y, Watier H, Girard AC, Leroy J, Bardos P.
    Journal: J Immunol Methods; 1991 Apr 25; 138(2):225-31. PubMed ID: 2033275.
    Abstract:
    We have used an ELISA procedure to compare the reactivity of samples with or without IgG anticardiolipin antibodies (ACA) on cardiolipin-coated wells (target wells) and cardiolipin-free wells (control wells), using 10% fetal calf serum (10% FCS), 10% adult bovine serum (10% ABS) or 1% bovine serum albumin (1% BSA) as buffer. With 1% BSA, ACA reactivity was very low which suggests that this buffer would be inappropriate for use in ELISA procedures for ACA. 10% FCS induced non-specific binding of normal IgG only on target wells, particularly in the case of IgG hypergammaglobulinemia. With 10% ABS, this non-specific binding occurred on the solid phase with and without cardiolipin and could be accurately evaluated by subtracting the absorbance of control wells. Results of assays on 35 systemic lupus erythematosus sera using 10% ABS as buffer showed that highly specific results-could be obtained only if non-specific binding was systematically subtracted.
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