Therapeutic oligonucleotides have recently been approved in the United States, the EU, and Japan. Hence, the analysis of oligonucleotides is an important topic in drug development. Liquid chromatographic techniques are commonly used for purity verification and the determination of oligonucleotides. In ion-pair reversed-phase separation, several parameters, such as the pore size of the stationary phase, mobile phase additives, and column temperature, were investigated using three types of oligonucleotides (18, 19, and 20 mer). All of the investigated parameters could influence the separation, and they are expected to be useful for optimizing oligonucleotide separation.
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http://dx.doi.org/10.2116/analsci.21P224 | DOI Listing |
J Chromatogr A
January 2025
Ionis Pharmaceuticals, Carlsbad, CA 92010, USA.
The increased effectiveness of small interfering RNAs (siRNAs) to induce gene silencing has brought a great therapeutic promise to many diseases. siRNAs are under highly active current research and development. Ligand conjugation and chemical modifications of the sense (SS) and antisense (AS) strands of the siRNA duplex improve stability and facilitate delivery, but significantly increase the complexity of the analytical requirements.
View Article and Find Full Text PDFJ Chromatogr A
January 2025
Department of Engineering and Chemical Sciences, Karlstad University SE-651 88 Karlstad, Sweden. Electronic address:
In indirect detection, sample components lacking detectable properties are detected by adding a detectable component to the eluent, a so-called probe that interacts with the analytes to be detected. This study focuses on modeling indirect detection in two principally different cases. In case (1), the analyte component has the same charge as the probe component, so the probe acts as a co-ion of the analyte.
View Article and Find Full Text PDFAnalyst
December 2024
Rieveschl Laboratories for Mass Spectrometry, Department of Chemistry, University of Cincinnati, PO Box 210172, Cincinnati, Ohio 45221-0172, USA.
The use of liquid chromatography coupled with mass spectrometry (LC-MS) for the characterization of oligonucleotides and nucleic acids is a powerful analytical method. Recently, hydrophilic interaction chromatography (HILIC) has been proposed as a reasonable alternative to ion-pair reversed phase separations of oligonucleotides prior to MS. A wide variety of HILIC stationary phase surface chemistries are currently available.
View Article and Find Full Text PDFJ Chromatogr A
January 2025
School of Pharmaceutical Sciences, University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva 4, Switzerland; Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva 4, Switzerland. Electronic address:
Ion-pair reversed-phase liquid chromatography (IP-RPLC) is clearly recognized as the gold standard for analyzing therapeutic oligonucleotides (ONs). Recent studies have shown that ONs exhibit an on-off retention behavior in IP-RPLC, meaning that minor changes in acetonitrile (ACN) proportion can significantly impact retention. However, this behavior was initially demonstrated with only a single mobile phase condition.
View Article and Find Full Text PDFAnal Bioanal Chem
January 2025
RNA Sciences, Sanofi, 1541 av. Marcel Mérieux, 69280, Marcy l'Étoile, France.
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