Generally, chromatography is
separated in to two categories. It is depending on the solvents flows down to
the column. If solvent granted to the flow down in the column by gravity, at
that time it is called gravity column chromatography. If the column pressured
down the column by positive air pressure, at that time it is called flash
chromatography. Many type
of chromatography like column
chromatography, affinity column chromatography,...