ZORBAXOriginalReversed-PhaseHPLCColumns ZORBAXOriginalReversed-PhasecolumnsaremadewithTypeAsilicaandareusefulformanyseparationsofacidicorneutralcompounds.Thesecolumnshaveahigheractivitylevelandarethereforeusefulforseparatingisomers(e.g.cis-trans,geometric)orothercompoundswheresilanolactivityenhancesselectivity.Thesecolumnsareusedinmanyestablishedmethods.