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Due to the high reproducibility of pH gradient slope and width, immobilized pH gradients (IPG) have been used as the first dimension of two-dimensional techniques in order to generate maps of constant spot position in the pI/Mr plane. However, when coupling IPG to SDS (sodium dodecyl sulphate) gels two problems were encountered: vertical streaking, due to incomplete zone solubilization in SDS, and horizontal streaking, due to spot fusion along the pH axis caused by the electroendosmosis of the charged Immobiline gels. Two methodical modifications are herewith described to overcome these drawbacks: (a) the SDS equilibration time of the first-dimension gel has been prolonged to at least 30 min; (b) the SDS electrophoresis gel has been cast together with a starting gel, containing 2.5 mM of each Immobiline species used in the first dimension, which serves as a transition from the charged to the uncharged gel.
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