title: Characterization of G-rich and T-rich oligonucleotides using ion-pair reversed-phase high-performance liquid chromatography/tandem electrospray ionization mass spectrometry.
abstract: Characteristics of G-rich and T-rich oligonucleotides were investigated to compare their retention time, total ion current (TIC) intensity, charge-state distribution and product ion using ion-pair reversed-phase high- performance liquid chromatography/tandem electrospray ionization mass spectrometry (IP-RP-HPLC/ESI-MS) at room temperature. Three commonly used mobile phases for the analysis of oligonucleotides, triethylammonium acetate (TEAA), triethylammonium bicarbonate (TEAB) and triethylammonium hexafluoroisopropanol (HFIP) have been utilized. Retention time of G-rich and T-rich oligonucleotides was significantly different in TEAA and TEAB buffer systems, while in the HFIP buffer system it was affected more by the length of oligonucleotides. On the other hand, the ESI-MS ion abundance in the HFIP buffer system was higher than that in both TEAA and TEAB buffers. The TIC intensity of T-rich oligonucleotides was much higher than that of G-rich oligonucleotides in all mobile phases. In addition, much higher charge-state fragments were observed in HFIP buffer system than that in the case of TEAA and TEAB buffer systems. Product ions of both G-rich and T-rich oligonucleotides were affected by charge state of parent ions and collision energy.
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Research Center of Mass Spectrometry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Renfang
authors.initials: R
authors.lastname: Song
authors.forename: Wenbing
authors.initials: W
authors.lastname: Zhang
authors.forename: Huayong
authors.initials: H
authors.lastname: Chen
authors.forename: Huimin
authors.initials: H
authors.lastname: Ma
authors.forename: Yulian
authors.initials: Y
authors.lastname: Dong
authors.forename: Guoying
authors.initials: G
authors.lastname: Sheng
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhou
authors.forename: Jiamo
authors.initials: J
authors.lastname: Fu
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006151:Guanosine / Q000737:chemistry*; D009841:Oligonucleotides / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013941:Thymine / Q000737:chemistry*
chemical_list: D009841:Oligonucleotides; D006151:Guanosine; D013941:Thymine