The utilization of ion-pairing reagents as mobile phase additives allows the elution of ionic and highly polar substances using reversed phase HPLC columns. The purity of mobile phase additives is a prime factor to their successful application. Sigma-Aldrich offers an outstanding collection of tailor-made reagents for anionic (quaternary ammonium and phosphonium salts) and cationic (alkanesulfonates) analyzes. All mobile phase additives are rigorously tested with special emphasis on the requirements of modern reversed phase HPLC:
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LiChropur is a trademark of Merck KGaA, Darmstadt, Germany
Journal of chromatography, 581(1), 57-63 (1992-10-02)
A simple and efficient procedure has been developed for the derivatization of diuretic agents in human urine by direct extractive alkylation and their detection by gas chromatography-mass spectrometry. The procedure is an improvement over previous extractive alkylation methods because of
This work investigates the utility of RPLC displacement chromatography for the purification of recombinant brain derived neurotrophic factor (rHu-BDNF) from its variants and E. coli. protein (ECP) impurities. The closely associated variants (six in total) differ by one amino acid
Journal of biomedical materials research. Part A, 80(4), 852-860 (2006-10-31)
Although much effort has been extended to the efficient cancer therapies, the drug resistance is still a major obstacle in cancer chemotherapeutic treatments. Almost 90% of the cancer therapy failure is caused by the relative problems. Recently, the application of
The Journal of pharmacology and experimental therapeutics, 288(3), 1192-1198 (1999-02-23)
Polyspecific organic cation transporters in epithelia play an important role in the elimination of many endogenous bioactive amines and therapeutically important drugs. Recently, the first human organic cation transporter (hOCT1) was cloned from liver. The purpose of the current study
Journal of lipid research, 8(1), 55-58 (1967-01-01)
Ethyl acetate or chloroform solutions of tetraheptylammonium chloride, an oil-soluble quaternary amine, quantitatively extract polar, anionic lipids such as steroid or bile salt conjugates from aqueous solution by a process of anion exchange.
