Separation of closely related peptides by capillary electrophoresis with a nonionic surfactant
Separation of Angiotensin II, its derivatives and motilins, which have the same electric charge but a single different amino acid, was performed by capillary electrophoresis with a micellar pseudo-phase of nonionic surfactant, Tween 20, in the solution. The weak interaction of the micelles with the peptides enabled the separation of motilins, peptides with a long chain length. Under these conditions, the micellar phase worked more like a stationary phase in liquid chromatography.
Key WordsCapillary electrophoresis Nonionic micelles Tween 20 Angiotensin II Motilin
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