Chromatography resins are used in purification and separation of proteins and other bio-molecules in biotechnology, pharmaceutical, food manufacturing, and environmental analysis. Chromatography resins are of three types, viz., synthetic, natural and inorganic media. Natural and synthetic resins are preferred over inorganic media. Chromatography resins are used in affinity, mixed-mode, ion-exchange, hydrophobic interaction and size exclusion techniques. In terms of revenues, Protein A resins accounted for the highest share of the market.