Establishment of Magnetic Affinity Enzyme Linked Immunoassay Based on Schistosoma japonicum Recombinant Antigen Sj26 and Its Application in Detection of Serum Antibody with Low Intensity of Infection
Objective To develop the magnetic affinity enzyme-linked immunoassay(MEIA) using recombinant glutathione-S-transferase of Schistosoma japonicum with a relative molecular weight of 26 000(rSj26-MEIA) for antibody detection under low intensity infection. Methods The recombinant plasmid pET28a-Sj26 was transformed into Escherichia coli strain BL21, and 0.6 mmol/L isopropyl β-D-1-thiogalactopyranoside(IPTG) was used to induce its expression. The expression products were purified by Ni~(2+)(nickel sulfate) affin...