Abstract
DNA restriction fragments and PCR products were separated by means of ion-pair reversed-phase high-performance liquid chromatography on alkylated non-porous poly(styrene-divinylbenzene) particles with a mean diameter of 2.1 microns. Optimum resolution was obtained by using an acetonitrile gradient in 100 mM of triethylammonium acetate and a column temperature of 50 degrees C. This allowed the separation of DNA fragments differing in chain length by 1-5% up to a size of 500 base pairs. PCR products could be analyzed directly in less than two minutes with a concentration sensitivity of at least 300 ng/ml. Compared with anion-exchange chromatography or gel electrophoresis no desaltation of the purified DNA molecules is required because the volatile buffer system can be readily evaporated. Subsequently, the method was used for the semiquantitative evaluation of the expression of multidrug resistance genes in mononuclear white blood cells.
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