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J Immunoassay Immunochem. 2013;34(2):166-79. doi: 10.1080/15321819.2012.699493.

apoB-independent enzyme immunoassay for lipoprotein(a) by capture on immobilized lectin (jacalin).

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Department of Biochemistry, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India.


Enzyme immunoassay for lipoprotein(a) [Lp(a)] using antibodies to both apoB and apo(a) subunits (a-B assay) is shown to be affected by differential masking of apoB by apo(a) and the presence of LDL-Lp(a) adducts. An apoB-independent immunoassay by capturing Lp(a) through its O-glycans on microplate-coated lectin jacalin and quantitation using peroxidase-labeled anti-apo(a) (J-a assay) is described. J-a assay response is linear, more than twice as sensitive as a-B assay, and is suppressed only 18 ± 5% by non-Lp(a) O-glycan-containing proteins of serum. Wide variations in IgA did not significantly affect Lp(a) binding to jacalin (CV = 6.4%).

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