Separation Behavior of Short Oligonucleotides by Ion-Pair Reversed-Phase Capillary Liquid Chromatography Using a Silica-Based Monolithic Column Applied to Simple Detection of SNPs
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Abstract
The separation behaviors of short oligonucleotides using capillary liquid chromatography have been investigated comparatively on an octadecylsilane (ODS) packed column (0.3 mm inner diameter, particle size 3 μm) and a monolithic ODS column (0.5 mm inner diameter, through pore size 2 μm). The present paper clearly demonstrates that the resolution obtained using the monolithic ODS packed column is much higher than that using a semi-μ-high-performance liquid chromatography (HPLC) column on a semi-μ-HPLC system. Furthermore, it was surprising that complete baseline resolution of oligonucleotides, typically shorter than 30-mer, with single nucleotide units was achieved using the monolithic column, although this was not possible using the ODS packed column. Good separation of short oligonucleotides was achieved at 40–60 °C with a linear 40–60 % gradient of methanol content. Separation conditions on the monolithic column were optimized regarding the type of counterion, methanol content, temperature, and flow rate. Using the present method, detection of single-nucleotide polymorphisms was achieved without using a mass-spectrometry (MS) detector.
Keywords
Capillary liquid chromatography Ion-pair reversed-phase separation Monolithic column Oligonucleotide Single-nucleotide polymorphismNotes
Acknowledgments
This research was supported by a Grant-in-Aid for Scientific Research 21200004 (2009–2011) on Innovative Areas from MEXT of Japan.
Supplementary material
References
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