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Development of Competitive Direct Enzyme-linked Immunosorbent Assay for the Detection of Gentamicin Residues in the Plasma of Live Animals

  • Jin, Yong (Department of Biochemistry, College of Veterinary Medicine, Seoul National University) ;
  • Jang, Jin-Wook (Department of Biochemistry, College of Veterinary Medicine, Seoul National University) ;
  • Lee, Mun-Han (Department of Biochemistry, College of Veterinary Medicine, Seoul National University) ;
  • Han, Chang-Hoon (Department of Biochemistry, College of Veterinary Medicine, Seoul National University)
  • Received : 2005.03.17
  • Accepted : 2005.06.28
  • Published : 2005.10.01

Abstract

Competitive direct ELISA was developed to detect gentamicin residues. Mice immunized with gentamicin-keyhole limpet hemocyanin (KLH) conjugate developed good antiserum titers, which gradually increased with booster injections, indicating immunization was successfully processed. Monoclonal antibody against gentamicin was prepared using hybridoma cells cloned by limit dilution of fused cells. IgG was purified from ascites fluid of hybridoma cell-injected mice through ammonium sulfate precipitation and Sephadex G-25 gel filtration. After the gel filtration, fractions of high antibody titer were further purified through affinity chromatography on protein A/G column. Monoclonal antibody against gentamicin was confirmed as IgG1, which has kappa light chain. Cross-reactivities ($CR_{50}$) of gentamicin monoclonal antibody to other aminoglycosides (kanamycin, neomycin, and streptomycin) were less than 0.005%, indicating the monoclonal antibody was highly specific for gentamicin. Standard curve constructed through competitive direct ELISA showed measurement range (from 80 to 20% of B/$B_0$ ratio) of gentamicin was between 1 and 40 ng/ml, and 50% of B/$B_0$ ratio was about 4 ng/ml. The gentamicin concentration rapidly increased to 1,300 ng/ml after the intramuscular administration up to 2 h, then sharply decreased to less than 300 ng/ml after 4 h of withdrawal, during which the elimination half-life ($t_{1/2}$) of gentamicin in the rabbit plasma was estimated to be 1.8 h. Competitive direct ELISA method developed in this study using the prepared monoclonal antibody is highly sensitive for gentamicin, and could be useful for detecting gentamicin residues in plasma of live animals.

Keywords

Monoclonal Antibody;Gentamicin;Aminoglycosides;Competitive Direct ELISA

Acknowledgement

Supported by : Seoul National University

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