Characterization of therapeutic oligonucleotides using liquid chromatography with on-line mass spectrometry detection.
A method for the analysis and characterization of therapeutic and diagnostic oligonucleotides has been developed using a combination of liquid chromatography and mass spectrometry (LC-MS). The optimized ion-pairing buffers permit a highly efficient separation of native and chemically modified antisense oligonucleotides (AS-ODNs) from their metabolites or failure synthetic products. The mobile phases were MS compatible, allowing for direct and sensitive analysis of components eluting from the column. The method was applied for the quantitation and characterization of AS-ODNs, including phosphorothioates and 2'-O-methyl-modified phosphorothioates. Tandem LC-MS analysis confirmed the identity of the oligonucleotide metabolites, failure products, the presence of protection groups not removed after synthesis, and the extent of depurination or phosphorothioate backbone oxidation.
Gilar
Martin
M
Life Sciences Chemistry R&D, Waters Corporation, Milford, MA 01757, USA. Martin_Gilar@waters.com
Fountain
Kenneth J
KJ
Budman
Yeva
Y
Holyoke
Jeffrey L
JL
Davoudi
Hamid
H
Gebler
John C
JC
D002851:Chromatography, High Pressure Liquid / Q000379:methods; D020319:Oligodeoxyribonucleotides, Antisense / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
D020319:Oligodeoxyribonucleotides, Antisense