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  • Title: Quantitative determination of human plasma apolipoprotein A-I by a noncompetitive enzyme-linked immunosorbent assay.
    Author: Koren E, Puchois P, McConathy WJ, Fesmire JD, Alaupovic P.
    Journal: Clin Chim Acta; 1985 Apr 15; 147(2):85-95. PubMed ID: 3921293.
    Abstract:
    A noncompetitive enzyme-linked immunosorbent assay (ELISA) for human plasma apolipoprotein A-I (ApoA-I) was developed. Microtiter plates were coated with purified antibodies to ApoA-I and blocked. Plasma samples from normolipidemic and hypertriglyceridemic subjects were added and ApoA-I was allowed to bind to coating antibodies. After washing, the amount of ApoA-I bound to microtiter plates was estimated with horseradish peroxidase-labeled antibodies to ApoA-I. A single step delipidization procedure was included to expose masked antigenic sites of ApoA-I in plasma. The average concentration of ApoA-I in plasma of normolipidemic subjects was 1.37 g/l. Recovery of ApoA-I added to plasma varied from 93-107%. Intra- and inter-assay coefficients of variations were 4 and 8%, respectively. The assay was also used for quantifying ApoA-I in lipoprotein density classes. There was a good correlation between this assay and electroimmunoassay (r = 0.84-0.92). The described sandwich ELISA is a specific, precise, sensitive and relatively simple method for measuring ApoA-I levels in human plasma.
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