Figure 5.
The ionic impedance at 3 kHz through the morpholino modified membrane prepared with the 1:7 ratio of amine:ester silanes. Different stages of DNA sensing are shown, where target and mutant are the complementary and noncomplementary 15-mer DNA oligomers, respectively. The measurements were performed in 10 µM KCl buffer and denaturing was achieved with 9.0 M urea.