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Clinical Chemistry 38: 2273-2277, 1992;
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Clinical Chemistry, Vol 38, 2273-2277, Copyright © 1992 by American Association for Clinical Chemistry

Pre-beta high-density lipoprotein determined by immunoblotting with chemiluminescent detection

MJ O'Kane, GB Wisdom, J McEneny, NV McFerran and ER Trimble
Department of Clinical Biochemistry, Royal Victoria Hospital, Belfast, UK.

We describe a novel assay of pre-beta high-density lipoprotein (HDL), a unique apolipoprotein A-I (apo A-I)-containing lipoprotein particle. The pre-beta and alpha lipoproteins are separated by electrophoresis in agarose and transferred onto a membrane by capillary blotting. The membrane blot is sequentially incubated with sheep anti-human apo A-I antiserum and then with a conjugate of rabbit anti-sheep immunoglobulin and horseradish peroxidase. Chemiluminescence formed by the peroxidase- catalyzed oxidation of luminol in the presence of an enhancer is captured on photographic film, and the pre-beta HDL band is quantified by transmission densitometry. The assay is calibrated with standards prepared from a reference serum diluted in 9 mol/L urea. Within-batch precision (CV) at pre-beta HDL concentrations of 22.1 and 44.3 mg/L was 7% and 4.9% respectively. Pre-beta HDL contained 1.6% (0.65-2.6%, mean and range) of total serum apo A-I in 30 normolipidemic subjects.


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