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We developed a non-competitive, enzyme-linked, immunosorbent assay (ELISA) for the quantitation of lipoprotein lipase (LPL) in human postheparin plasma using affinity-purified antihuman milk lipoprotein lipase antibodies produced in chicken eggs and a monoclonal antibody directed against human lipoprotein lipase. We compared our ELISA method with a commercially available sandwich-enzyme immunoassay (Markit-F LPL EIA Kit, Dainippon Pharmaceutical Co, Ltd. Osaka, Japan). The reference values for lipoprotein lipase catalytic activity concentration and mass concentration in healthy Finns were determined. Lipoprotein lipase activity concentration (mean +/- SD) was 297 +/- 112 U/l in women, and mass concentration as measured by the ELISA method was 1058 +/- 367 micrograms/l. The corresponding values for men were 247 +/- 97 U/l and 815 +/- 207 micrograms/l, respectively. Across the whole concentration range of the ELISA method, the control samples' intra- and inter-assay coefficients of variation (CV) were 5.1% and 6.5%, respectively. The correlation between the ELISA and EIA methods was good, r = +0.81. The importance of the correct standardisation of immunoassays is discussed.

clinical chemistry and laboratory medicine

Development and Evaluation of an ELISA Method for the Determination of Lipoprotein Lipase Mass Concentration — Comparison with a Commercial, One-Step Enzyme Immunoassay