two-dimensional planar chromatography

Two-dimensional planar chromatography is a technique where the stationary phase is arranged as a thin, two-dimensional sheet. This method is a type of chromatography, a separation process involving a stationary phase and a mobile phase. In planar chromatography, samples are applied as spots at the edge of the stationary bed. The mobile phase moves through the stationary phase, driven by capillary action, separating the components of the mixture.123

A key characteristic of two-dimensional planar chromatography is that after an initial separation, the plate is rotated 90 degrees, and a second development occurs with a different mobile phase. This allows for more complex separations than a single-dimension approach. The separated components are identified by their migration distance relative to the mobile phase front, known as the R_f value.3