Fig. 12.
Typical protein immobilization sensogram is shown as a plot of Response Unit (RU) against time. The following protein amine coupling procedure was used: 1 min equilibration followed by 7 min EDC/NHS activation; 2 min equilibration followed by 5 min protein injection; 2 min equilibration followed by 5 min ethanolamine capping; 5 min equilibration. A final coupling of 15,000 RU of a protein was achieved. One resonance unit (RU) represents the binding of approximately 1 pg protein/mm2 and thus it is proportional to the mass of protein bound (36)