Abstract
During the total chemical synthesis of a structural gene for the human peptide hormone angiotensin II [1] some difficult problems in ion-exchange chromatography of protected oligodeoxyribonucleotides were solved using an adsorption and a chromatographic column in combination with an automatic gradient generator and gradienttermination controller. This arrangement allows a well-timed gradient termination and therefore the separation of substances with only a small difference in charge. On the other hand the automatic run of the chromatography of protected oligonucleotides reduces the time factor in oligonucleotide chemistry. This technique is applicable for ion-exchange chromatography in general.
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