ABSTRACT
<p><b>AIM</b>To establish antibody sandwich enzyme-linked immunoadsorbent assay for determination of recombinant E. coli L-asparaginase in rat plasma and study its pharmacokinetics.</p><p><b>METHODS</b>A Japanese white rabbit was immunized with recombinant E. coli L-asparaginase. Immunoglobulin G was separated and purified by using DEAE-cellulose chromatography. Conjugation of horseradish peroxidase to immunoglobulin G was obtained using the two-step glutaraldehyde method. Recombinant E. coli L-asparaginase protein in plasma was measured by antibody sandwich enzyme-linked immunoadsorbent assay. Pharmacokinetic parameters were assessed with model-dependent method.</p><p><b>RESULTS</b>The linearities was 1-64 U.L-1. Concentration-time profile after i.v. of 1.25, 2.50, 5.00 kU.kg-1 of recombinant E. coli L-asparaginase fitted with a two-compartment model. The first and terminal elimination T1/2 were 0.50-0.57 h and 2.45-3.02 h, respectively. The AUC was linearly related to the doses.</p><p><b>CONCLUSION</b>Antibody sandwich enzyme-linked immunoadsorbent assay was constant, reliable, sensitive, and suitable for the determination of recombinant L-asparaginase. Pharmacokinetics of recombinant E. coli L-asparaginase in rats is warranted for the design of future clinical trails.</p>