Development of competitive ELISA for the detection of bovine serum albumin using single-chain variable fragments
2017
Abstract Soluble anti-bovine serum albumin (BSA) single-chain variable fragments (scFvs) were expressed in E. Coli. HB2151. The antigen-binding equilibrium dissociation constant of the scFvs was determined to be 2.9 × 10 −8 M by surface plasmon resonance analysis. A competitive ELISA for the detection of BSA was developed using the antibody fragment above. The limits of detection (I 10 ) and I 50 were 0.002 and 0.74 μg/ml respectively, with a recovery between 87.8 and 119.2% in spiked milk samples. The assay has the potential to be used to detect concentration of BSA in milk or other matrix instead of the ELISA based on traditional antibodies.
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