Carrier ampholytes-based capillary electrophoresis as an alternative to capillary zone electrophoresis in classical background electrolytes.
Carrier ampholytes (CAs), originally designed for isoelectric focusing (IEF), have been used as background electrolytes (BGE) in capillary zone electrophoresis (CZE). Their main electrophoretic properties, relatively high buffering capacity and low electric conductivity allowed fast (less than 2 min) and high efficient (500,000 theoretical plates/m) separation of a test mixture of proteins under very high electric field strength (more than 1000 V/cm). The results obtained in such buffers have been compared to those obtained in more classical sodium--phosphate and sodium--N-(2-hydroxyethyl)piperazine-N'-(2-ethanesulfonate) background electrolytes. High ionic strength classical buffers were necessary to achieve the separation of the proteins contained in the test mixture. This induced a significant Joule heating and temperature increase inside the capillary whereas a negligible Joule heat was produced in carrier ampholyte buffers even at the above electric field strength (higher than 1000 V/cm).
Busnel
Jean-Marc
JM
Laboratory of Environment and Analytical Chemistry, UMR CNRS 7121, ESPCI, 10 rue Vauquelin, 75005 Paris, France. jean-marc.busnel@espci.fr
Kilár
Ferenc
F
Kasicka
Václav
V
Descroix
Stéphanie
S
Hennion
Marie-Claire
MC
Peltre
Gabriel
G
D002021:Buffers; D004573:Electrolytes / Q000737:chemistry*; D019075:Electrophoresis, Capillary / Q000379:methods*
D002021:Buffers; D004573:Electrolytes