Recent findings have elucidated numerous novel biological functions for oligonucleotides. Current standard methods for the study of oligonucleotides (i.e., hybridization and PCR) are not fully equipped to deal with the experimental needs arising from these new discoveries. More importantly, as the intracellular capacity of oligonucleotides is being harnessed for biomedical applications, alternative bioanalytical techniques become indispensable in order to comply with ever-increasing regulatory requirements. Owing to its ability to detect oligonucleotides independent of their sequence, LC-MS is emerging as the analytical method of choice for oligonucleotides. In this article, the current applications of LC-MS in the analysis of oligonucleotides, with an emphasis on RNA therapeutics and biomarkers, will be examined. In addition, the theoretical framework of oligonucleotide ESI is carefully inspected with the purpose of identifying the contributing factors to MS signal intensity.
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