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. Author manuscript; available in PMC: 2010 Aug 10.
Published in final edited form as: Electrophoresis. 2010 Mar;31(5):902–909. doi: 10.1002/elps.200900589

Figure 1.

Figure 1

(A) Schematic of the membrane-less DFGF device. The electrodes in this apparatus are placed within the separation channel. To remove gas produced on the electrodes, an on-column degassing system, which uses a 250-μm thick Teflon sheet with an applied vacuum, is employed. (B) Calibration curve to determine pH based on the measured hue within the separation channel. Only the (◆) symbols were included in the correlation as the (◇) values line outside of the indicating range for neutral red. The solid line represents the least squares linear fit and has a standard error of ~0.09 pH units.