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Biotinylated oligonucleotides combined with streptavidin-coated magnetic beads are commonly used in current molecular biology. Their quality and the level of incorporated biotin are essential for yielding good results in either solid-phase DNA sequencing or solid-phase purification procedures. This paper presents a very simple analytical test using anion-exchange HPLC and avidin to ascertain the quality of biotinylated oligonucleotides and to predetermine their ability to bind to avidin, which is a prerequisite for functionality in some solid-phase methods.
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