Fig. 9.

Results obtained from droplet samples moved to the QCM-sensor. Each block of measurement data is taken from the same droplet. Once more the reduction in the resonance frequency corresponds with a binding of molecules. No change in the measured resonance frequency and their variances between the droplets of the same composition could be seen (Streptavidin 1–3). Thus, the high variations are a direct result of the applied integration method. Measurements on two PBS droplets before and after the binding of streptavidin molecules confirm the bio-chemical binding.