Isoelectric focusing (IEF) gels separate proteins based on their net charge rather than their molecular weight. IEF gels are cast with carrier ampholytes to create a pH gradient within the gel. Proteins migrate to their pI, the pH at which their net charge is zero. IEF gels contain no denaturing agents, allowing one-dimensional separation under native conditions.
Criterion precast gels include a broad selection of 13.3 x 8.7 cm polyacrylamide gels in single-use cassettes. This gel size provides reproducible, high-resolution results with fast setup, loading, and run times. Criterion gels are packaged and sold in individual units: 1–2 gels can be run in the Criterion cell and 1–12 gels can be run in the high-throughput Criterion Dodeca cell. The Criterion blotter offers a variety of convenient features, such as two electrode configurations and a convenient gel/blot assembly tray, for blotting applications.