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High signal stability of the capillary mixer was recorded over a period of 20 min. The total ion count for a 5 μm solution of Cyt c in 50 mm NH4OAc. The flow rate was 2.75 μL min−1 and inner capillary positioning was at 0.4 s to allow minimal reaction time. The maximum signal corresponds to 6.2×104 ion counts.
