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Comparison of the electropherograms obtained using a 50 μM solution of DA and CAT, a 5-s injection at 5 kV, a 25-kV separation potential and a 10 mM TES (pH = 7.2) separation buffer with 5 % 1-propanol in a 16 μm i.d. capillary with (a) a 30-μm diameter carbon fiber microelectrode and (b) a 5-μm diameter carbon fiber microelectrode.
