title: Preliminary investigation of the application of on-line membrane extraction of trifluoroacetic acid as an aid to improvement of negative ion electrospray mass spectrometry data.
abstract: We have recently investigated the biodegradation of a number of acidic aromatic compounds that give excellent chromatography using trifluoroacetic acid (TFA) based HPLC methods. Unfortunately HPLC methods using TFA are not usually compatible with detection by negative ion mass spectrometry as TFA suppresses ionisation of the analyte during the electrospray process. We present a preliminary investigation of the use of an anion-exchange micro-membrane suppressor to remove TFA on-line post column with the aim of improvement of mass spectral data using an aromatic acid as an example, Thus LC-MS using a TFA based HPLC method with negative ion mass spectral detection is shown to be possible with good sensitivity.
authors.affiliation: SmithKline Beecham Pharmaceuticals, Harlow, Essex, UK. anthony_p_new@sbphrd.com
authors.forename: A P
authors.initials: AP
authors.lastname: New
authors.forename: J C
authors.initials: JC
authors.lastname: Wolff
authors.forename: S
authors.initials: S
authors.lastname: Crabtree
authors.forename: L
authors.initials: L
authors.lastname: Freitas do Santos
authors.forename: G
authors.initials: G
authors.lastname: Okafo
authors.forename: J
authors.initials: J
authors.lastname: Lee
authors.forename: K
authors.initials: K
authors.lastname: Divan
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D008567:Membranes, Artificial; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet; D014269:Trifluoroacetic Acid / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D014269:Trifluoroacetic Acid