... head Packing materials generally made of silica gel, alumina, and agarose are available to allow separation by partition, adsorption, ion exchange, size, and affinity modes A useful LC modification ... remember that HPLC is both an analytical and a preparative tool Often the preparative capabilities of the HPLC are overlooked While normal analytical injections contain picogram to nanogram quantities, ... chromatographer in using an HPLC system as a tool Twenty-five years in HPLC, first as a user, then in field sales and application support for HPLC manufacturers, and finally working as a teacher and...