title: Separation and identification of oligonucleotides by hydrophilic interaction liquid chromatography (HILIC)-inductively coupled plasma mass spectrometry (ICPMS).
abstract: A method for the separation and detection of oligonucleotides utilizing hydrophilic interaction liquid chromatography (HILIC) with inductively coupled plasma mass spectrometry (ICPMS) is described. Polythymidylic acids of various lengths (10, 15, 20 and 30 nucleotides) were separated under gradient HILIC conditions. Selective detection of oligonucleotides was possible through monitoring m/z 47, corresponding to (31)P(16)O(+), using ICPMS. Oxygen was used as a reaction gas in the collision/reaction cell to produce PO(+) by reacting with phosphorus in the gas phase, thereby effectively eliminating the interferences for phosphorus normally seen at m/z 31. Limits of detections (LODs) were determined to be 1.69 pmol, 1.21 pmol, 1.0 pmol and 0.55 pmol loaded on column for the 10, 15, 20 and 30 mer, respectively.
authors.affiliation: University of Cincinnati/Agilent Technologies Metallomics Center of the Americas, Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA.
authors.forename: Renee N
authors.initials: RN
authors.lastname: Easter
authors.forename: Karolin K
authors.initials: KK
authors.lastname: Kröning
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Caruso
authors.forename: Patrick A
authors.initials: PA
authors.lastname: Limbach
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D056148:Chromatography, Reverse-Phase / Q000379:methods; D057927:Hydrophobic and Hydrophilic Interactions; D013058:Mass Spectrometry / Q000379:methods*; D011071:Poly T / Q000032:analysis* / Q000302:isolation & purification; D013696:Temperature
chemical_list: D011071:Poly T