STABILITY AND PURITY OF LOW-POLARITY ADSORBENTS FOR COUPLED SUPERCRITICAL FLUID EXTRACTION-SUPERCRITICAL FLUID CHROMATOGRAPHY-FLAME IONIZATION DETECTION

摘要

Several adsorbent materials have been evaluated for their purity and stability when used and reused in on-line solid-phase adsorption (SPA)-supercritical fluid extraction (SFE)-supercritical fluid chromatography (SFC) with neat carbon dioxide as mobile phase and flame ionization as universal detection. The low-polarity adsorbents in this study were made of deactivated glass, solid and porous silica, polymeric beads and a continuous bed of polyacrylamide.