Abstract
INTRODUCTIONThis protocol describes a method for separating proteins based on their net charge using the technique of isoelectric focusing (IEF) on immobilized pH gradient (IPG) gels, providing the first dimension of the 2D separation. In this protocol, the IPG gels are focused using self-contained instruments for IEF. These high-voltage systems allow fewer manipulations of the IPG gels, resulting in less error, strip mix-up, contamination, air contact, or urea crystallization. Because rehydration and IEF can be performed consecutively within a single unit, these two steps can be performed unattended overnight. Finally, faster separations and sharper focusing are possible due to the higher voltage available in these instruments.
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