Chromatographic methods can be classified according to the types of mobile and stationary phases as follows: Where: GSC = gas-solid chromatography GLC = gas-liquid chromatography PC = paper chromatography LSC = liquid-solid chromatography IEC = ion-exchange chromatography TLC = thin-layer chromatography BPC = bond-phase chromatography EC = exclusion chromatography LLC = liquid-liquid chromatography GPC = gel permeation chromatography GFC = gel filtration chromatography