We have automated the trityl-on purification of oligonucleotides by use of an XYZ axis robotic solid-phase extraction system. This greatly decreased the preparation time required for oligonucleotide purification. After about 15 min for set up of the samples and instrument, the oligonucleotides are automatically purified with a 15-min run time per sample. Thus, for example, the purification of 15 oligonucleotides requires only about 15 min of preparation time and 4 h of machine time. Yields and purity are equivalent to manual methods.
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