RESUMO
<p><b>OBJECTIVE</b>To establish a purificatory method of alpha-fetoprotein variant (AFP-L3) based on microspincolumn with lens culinaris agglutinin (LCA).</p><p><b>METHODS</b>LCA was isolated by ammonium sulfate precipitation method from lens culinaris. AFP-L3 affinity adsorption microspincolumns which were made from LCA coupled with activated Sepharose 4B were prepared. By adding into the centrifuge column, serum was absorbed and eluted to purify AFP-L3. The results of purified AFP-L3 detection of 10 cases AFP positive sera by electro-chemiluminescence immunoassay were compared with traditional crossed affinity immunoelectrophoresis.</p><p><b>RESULTS</b>8 of 10 cases AFP-L3 concentration were greater than 5 ng/ml in purified sera. Six cases show positive reaction in affinity immune cross electrophoresis experiment.</p><p><b>CONCLUSION</b>Successfully established purification method of AFP-L3 by affinity absorption based on microspincolumn. The method was more conducive to clinical laboratory applications due to its high sensitive and easy operation.</p>