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A lifetime‐based ratiometric microscale pH sensor system and a fluorescence microscopic setup was developed for the in‐line observation of pH in free‐flow isoelectric focusing based on the principle of time‐domain dual lifetime referencing (t‐DLR). The t‐DLR method has been developed for pH monitoring and various other applications in the fields of environmental monitoring and biotechnology. Here,...
We present methods for fabrication and application of microfluidic chips for free-flow electrophoresis (FFE) that allow integrated pH sensing. Monitoring of the pH gradient in microfluidic free-flow isoelectric focusing (FFIEF) allows on-line adjustment of the parameters for electrophoresis and evaluation of the isoelectric point (pI) of focused analyte bands almost in real time. The fabrication of...
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