Application of Optical Protein-chip in Detecting Phage M13KO7
光学蛋白芯片技术在噬菌体M13KO7检测中的应用

Avidin layer was bound on the substrate surface of Silicon wafer modified with aldehyde. The interaction between avidin and biotin was adopted for the immobilization of mouse monoclonal biotin-anti-M13 (antibody GP3)-labeled biotin. The surface was incubated in a solution containing phage M13KO7, which was trapped by the antibody GP3 with the interaction between phage M13KO7 and antibody GP3, resulting in a variation of layer thickness that was detected by imaging ellipsometry. The results showed a saturated layer of antibody GP3 with a thickness about 6.9 nm on the surface of the silicon wafer. The specific interaction between phage M13KO7 and antibody GP3 resulted in a variation of the layer thickness. The layer of phage M13KO7 bound with antibody GP3 was 17.5 nm in the concentration of 1.1 x 10(10) pfu/mL. Each variation of layer thickness corresponded to a concentration of phage M13KO7 in the range of 0.1 x 10(10) approximately 2.5 x 10(10) pfu/mL, with the sensitivity of 10(9) pfu/mL. Compared with other methods, the optical protein-chip requires only short measurement time, is label free, is a quantitative test, and can be visualized. This study could be significant on the investigation of interactions between the antibody and virus, and shows potential in the early diagnosis of virosis.