Figure A4.
Control experiment for the detection of dopamine in the presence of norepinephrine. NIR fluorescence images of single (SWCNT)-DNA sensors. Here, 50 nM dopamine was added (t = 60 s) in the presence of 50 nM norepinephrine in phosphate-buffered saline. Control experiment using SWCNT-(AT)15, which showed a lower affinity/selectivity for dopamine (see Figure 3 and Figure 4). Insets show the fluorescence image of the single sensor at t = 0. Fluorescence counts were normalized. Scale bar = 1 μm.