Nanobrook Omni测量应用案例-90

Control over the ligand surface density provides an accurate molecular basis for the quantitative study of biomolecular interactions. However, the classic hybrid self-assembly method lacks general applicability toward different self-assembly systems. In this paper, we report a new method based on the reaction kinetics of vinyl sulfone groups presented on surface to control the surface ligand density. Nα, Nα-bis(carboxymethyl)-L-lysine (ab-NTA) was selected as the model biological ligand and the catalyst for surface reaction was screened. The surface reaction was characterized by X-ray photoelectron spectroscopy (XPS) and the surface membrane potential. Static water contact angle was used to quantify the kinetics of the surface reaction, and calculations showed that the rate constant was 0.0012 min-1. The ability of the biological functional surface to bind a histidine labeling protein (SA-6His) was investigated by surface plasmon resonance (SPR).