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In this protocol, nuclease digestion of an oligonucleotide is followed by dephosphorylation and HPLC analysis of the monomers on a reversed-phase C18 column. This method can be used to detect and quantitate a wide variety of nucleobase modifications in oligonucleotides. Integrated areas of the nucleoside chromatogram give precise quantitation of nucleoside composition when the relative extinction coefficient cofactors are applied to the sum of the areas of the four bases. The protocol is also useful for analysis of oligonucleotides containing conjugated moieties and carbohydrate modifications.
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Andrus et al. (2000) studied this question.
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