Ion-pairing reagents as mobile phase additives enable the separation of ionic and highly polar substances on reversed phase HPLC columns. The purity of mobile phase additives is a most important parameter to be considered for their successful application. Sigma-Aldrich has a broad-range of tailor-made reagents for anionic (quaternary ammonium and phosphonium salts) and cationic (alkanesulfonates) determinations. All mobile phase additives are subjected to rigorous testing with special emphasis on the needs of modern reversed phase HPLC:
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