title: An electrospray mass spectrometric method for accurate mass determination of highly acid-sensitive phosphoramidites.
abstract: An accurate mass determination method utilizing electrospray ionization mass spectrometry is described for analysis of several different types of phosphoramidites that are extremely acid-sensitive compounds. An earlier method, which applied a LiCl/acetonitrile system, was extended for this special application by using polymeric standards including poly(ethylene glycol) (PEG), poly(ethylene glycol) dimethyl ether (PDE) and poly(propylene glycol) (PPG). Concentrations of standards, samples and LiCl were optimized and potential impurities that affect the analyses were also investigated.
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, CO, USA. kupi@ovrisc.mdche.u-szeged.hu
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Kupihár
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Timár
authors.forename: Zsuzsanna
authors.initials: Z
authors.lastname: Darula
authors.forename: Douglas J
authors.initials: DJ
authors.lastname: Dellinger
authors.forename: Marvin H
authors.initials: MH
authors.lastname: Caruthers
mesh_terms: D000143:Acids / Q000737:chemistry*; D008970:Molecular Weight; D009943:Organophosphorus Compounds / Q000032:analysis* / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D000143:Acids; D009943:Organophosphorus Compounds; C434331:phosphoramidite