title: Isotopic separation of acetaldehyde and methanol from their deuterated isotopologues on a porous layer open tubular column allows quantification by stable isotope dilution without mass spectrometric detection.
abstract: An isotopic separation of acetaldehyde and acetaldehyde-2,2,2-d3 was achieved in a temperature programmed run on a porous layer open tubular (PLOT) capillary column coated with particles of divinylbenzene ethylene glycol/dimethylacrylate (Rt®-U-BOND). This is the prerequisite for the development of quantitative analytical methods based on a stable isotope dilution assay (SIDA) without a mass spectrometric detection (non-MS SIDA). For routine analysis a flame ionization detector (FID) can thus be applied as a robust and low-cost alternative. In a preliminary study, static headspace extraction and gas chromatographic separation (HS-GC-FID) of acetaldehyde in aqueous solutions was shown as an application. Good linearity was obtained in a calibration range from 0.4 to 40mgL-1, with peak integration benefitting from the inverse isotope effect encountered on the specific porous polymer. Furthermore, separation of methanol and deuterated methanol (d3) could also be achieved under the same chromatographic conditions. The achieved isotopic separation of these important volatile compounds now allows non-MS SIDA-based methods that are still to be developed.
authors.affiliation: Dienstleistungszentrum Ländlicher Raum (DLR) Rheinpfalz, Institute for Viticulture and Oenology, Breitenweg 71, 67435 Neustadt an der Weinstraße, Germany; University Duisburg-Essen, Faculty for Chemistry, Instrumental Analytical Chemistry, Universitätsstraße 5, 45141 Essen, Germany. Electronic address: hans-georg.schmarr@dlr.rlp.de.
authors.forename: Hans-Georg
authors.initials: HG
authors.lastname: Schmarr
authors.affiliation: Dienstleistungszentrum Ländlicher Raum (DLR) Rheinpfalz, Institute for Viticulture and Oenology, Breitenweg 71, 67435 Neustadt an der Weinstraße, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Wacker
authors.affiliation: Dienstleistungszentrum Ländlicher Raum (DLR) Rheinpfalz, Institute for Viticulture and Oenology, Breitenweg 71, 67435 Neustadt an der Weinstraße, Germany.
authors.forename: Maximilian
authors.initials: M
authors.lastname: Mathes
mesh_terms: D000079:Acetaldehyde / Q000302:isolation & purification*; D002138:Calibration; D002849:Chromatography, Gas / Q000295:instrumentation; D003903:Deuterium / Q000737:chemistry*; D005410:Flame Ionization; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D007201:Indicator Dilution Techniques; D007553:Isotope Labeling / Q000379:methods*; D013058:Mass Spectrometry / Q000295:instrumentation* / Q000379:methods*; D000432:Methanol / Q000302:isolation & purification*; D016062:Porosity
chemical_list: D003903:Deuterium; D000079:Acetaldehyde; D000432:Methanol
keywords: Acetaldehyde; Flame ionization detection; Gas chromatography; Porous layer open tubular column; Stable isotope dilution assay; Static headspace extraction