A Dependable Microelectronic Peptide Synthesizer Using Electrode Data

Figure 7

MEA direct sensing electrode pair (electrode # 62 and # 63) measurements of impedance and phase.

(a) MEA direct sensing electrode pair (62-63) measurement in the case of a pure peptide fluid. Impedance (10 Ω–100 kΩ scale) and phase (−120 deg–40 deg scale) versus frequency (1 kHz–50 MHz scale)

(b) Measured MEA direct sensing electrode pair impedance in the case of droplet absence (empty), TFA, pure, and impure peptide fluids (1 kHz–407 kHz frequency range)

(c) Previous measurements zoomed in for the last three droplet cases in the 11 kHz–70 kHz range

(d) MEA direct sensing electrode pair phase measurements in the case of droplet absence, TFA, pure, and impure peptide droplets (1 kHz–1.2 MHz frequency range)

(e) Previous phase measurements zoomed in for the last three droplet cases in the 11 kHz–70 kHz frequency range