title: Alternative plugs flow liquid chromatography (APFLC)/EI-MS system using a T-shaped flow path.
abstract: The vapor condensation method can be used for forming an alternative flow of liquid masses using a single solvent for alternative plugs flow liquid chromatography (APFLC), described in our previous paper. APFLC is more effective when adopting a T-shaped flow path and aqueous-organic solvents with a liquid-to-gas volume ratio (bulk fraction; β) ranging between 0.0006 and 0.004 in an open tubular GC capillary column at below 70°C. High-density plugs flow by a T-shaped flow path leads to extremely high resolution. Alternative plugs flow is formed when the liquid contact angle to the solid phase is above 75°. An aqueous mixture of the usual HPLC solvent can be readily used for APFLC. An EI-mass spectrum is obtained that is comparable with that in the NIST library, except for the DMF mixture medium. Due to low-pressure loss properties in the column, the system does not require a high-pressure liquid pump. Solid hydrocarbon resin with a contact angle to water of between 75° and 79°, such as polystyrene and olefinic polymers, is anticipated to be applicable to APFLC and hydro-membrane gas chromatography (HMGC) by a consideration of their surface tensions.
authors.affiliation: Infra-red Spectroscopy Analytical Laboratory, 3-3-13 Chuo, Ebina, Kanagawa 243-0432, Japan. ir-tanikawa@ir-bunseki.com
authors.forename: Isao
authors.initials: I
authors.lastname: Tanikawa
authors.forename: Miwako
authors.initials: M
authors.lastname: Konuma
authors.forename: Hiroko
authors.initials: H
authors.lastname: Hosono
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nakamura
mesh_terms: D002849:Chromatography, Gas / Q000295:instrumentation; D002853:Chromatography, Liquid / Q000295:instrumentation*; D006371:Helium / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization / Q000295:instrumentation; D013500:Surface Tension
chemical_list: D011108:Polymers; D012997:Solvents; D006371:Helium