Chromatogr., 845, 1999, 21-31. ass: Standard non-polar; Column diameter: 0.23 mm; Column length: 50 m; Column type: Capillary; Heat rate: 2 K/min; Start T: 30 C; End T: 200 C; Start time: 2 min; CAS no: 75070; Active phase: BP-1; Carrier gas: He; Data type: Kovats RI; Authors: Bartley, J.P.; Schwede, A.M., Production of volatile componds in ripening kiwi fruit (Actinidia chinensis), J. Agric. J.H. ; Yook, H.S. (2005) adopted a different approach, using density-functional theory (DFT) to calculate band strengths for gas-phase acetaldehyde. Additional reaction products certainly can be suggested, such as ethanol, a reduction product, or diacetyl, (CH3CO)2, from radical dimerization, but the complexity of our IR spectra make all such suggestions highly speculative. Standard Beer's law plots then gave the apparent absorption coefficients (α′) in Table 2. Food Chem., 29, 1981, 57-63. ass: Standard non-polar; Column diameter: 0.31 mm; Column length: 25 m; Column type: Capillary; Heat rate: 2 K/min; Start T: 60 C; End T: 200 C; CAS no: 75070; Active phase: OV-101; Carrier gas: He; Data type: Kovats RI; Authors: Morales, A.L. ; Flath, R.A.; Guntert, M.; Jennings, W., Nectarine volatiles: vacuum steam distillation versus headspace sampling, J. Agric. ; Yunes, R.A.; Heinzen, V.E.F., Application of the semi-empirical topological index in quantitative structure-chromatographic retention relationship (QSRR) studies of aliphatic ketones and aldehydes on stationary phases of different polarity, J. Braz. Band strengths and absorption coefficients were not calculated for these crystalline ices, but positions of selected peaks are listed in Table 3. (2004), Dartois (2005), and Vinogradoff et al. All IR spectra were collected by co-adding 300 scans at a resolution of 4 cm −1. Isosbestic points near 3001, 2871, 1436, 1427, 1408, 1402, and 1119 cm−1 were consistent with an interpretation of there being no intermediate phase. The same authors also pointed out that no H2O-ice was present in two previous experiments that produced acetaldehyde by electron-radiolysis at 10 K (Bennett et al. natalensis Berger, J. Agric. YOU WILL NEED A PERIODIC TABLE, A TABLE OF COMMON … ; Marbot, R.; Bello, A., Volatile compounds of Psidium salutare (H.B.K.) + \!\rm e^- \\
Technol., 220, 2005, 226-231. class: Standard polar; Column diameter: 0.25 mm; Column length: 60 m; Column type: Capillary; Description: 50C(3min)=>3C/min =>100C=>10C/min =>220C(13.5min); CAS no: 75070; Active phase: FFAP; Carrier gas: He; Phase thickness: 0.5 um; Data type: Linear RI; Authors: Ranau, R.; Kleeberg, K.K. From this slope A′ is calculated. Food Chem., 32, 1984, 987-992. umn class: Standard non-polar; Column length: 2 m; Column type: Packed; Start T: 100 C; CAS no: 75070; Active phase: SE-30; Substrate: Gaschrom Q; Data type: Kovats RI; Authors: Winskowski, J., Gaschromatographische Identifizierung von Stoffen anhand von Indexziffem und unterschiedlichen Detektoren, Chromatographia, 17(3), 1983, 160-165. umn class: Standard non-polar; Column length: 12 ft; Column type: Packed; Start T: 150 C; CAS no: 75070; Active phase: SE-30; Substrate: Celatom AW silanized; Data type: Kovats RI; Authors: Haken, J.K.; Nguyen, A.; Wainwright, M.S., Application of linear extrathermodynamic relationships to alcohols, aldehydes, ketones, amd ethoxy alcohols, J. Food Chem., 47, 1999, 3702-3705. ass: Standard polar; Column diameter: 0.32 mm; Column length: 60 m; Column type: Capillary; CAS no: 75070; Active phase: HP-Innowax; Carrier gas: Helium; Phase thickness: 0.25 um; Data type: Normal alkane RI; Authors: Viegas, M.C. The IR peaks expected for 13CO and H213C13CO, labelled ketene, are well separated. A, 973, 2002, 135-142. umn class: Standard non-polar; Column diameter: 0.32 mm; Column length: 50 m; Column type: Capillary; Start T: 20 C; CAS no: 75070; Active phase: HP-1; Phase thickness: 1.05 um; Data type: Kovats RI; Authors: Heberger, K.; Gorgenyi, M.; Kowalska, T., Temperature dependence of Kovats indices in gas chromatography revisited, J. Chromatogr. Nova, 30(8), 2007, 2031-2034. ass: Standard polar; Column diameter: 0.53 mm; Column length: 60 m; Column type: Capillary; Heat rate: 3 K/min; Start T: 50 C; End T: 180 C; Start time: 10 min; CAS no: 75070; Active phase: DB-Wax; Phase thickness: 1 um; Data type: Normal alkane RI; Authors: Rizzolo, A.; Cambiaghi, P.; Grassi, M.; Zerbini, P.E., Influence of 1-Methylcyclopropene and Storage Atmosphere on Changes in Volatile Compounds and Fruit Quality of Conference Pears, J. Agric. Those authors' work did not include solid-phase results, but their suggestion has now been confirmed by us for solid acetone, acetic acid, and acetaldehyde (Fig. 2017). Previous work in our laboratory gave n670 = 1.303 and ρ = 0.787 g cm−3 for the refractive index and density, respectively, of amorphous acetaldehyde near 15 K (Hudson & Coleman 2019). The original thickness of each ice was about 1.3 µm. Food Res. 2 0 obj
Chem. Multiplication of each absorbance or band area by ln(10) ≈ 2.303 was then done to convert from a common to a natural logarithmic scale. aVibrational assignments and descriptions are from Hollenstein & Günthard (1971). Spectra are offset vertically for clarity. Table 1 gives the positions of selected peaks in the IR spectrum of the 18 K ice, rounded to the nearest 1 cm−1. Food Agric., 81, 2001, 1547-1552. ass: Standard polar; Column diameter: 0.25 mm; Column length: 30 m; Column type: Capillary; Heat rate: 4 K/min; Start T: 20 C; End T: 200 C; End time: 1 min; Start time: 1 min; CAS no: 75070; Active phase: FFAP; Carrier gas: He; Phase thickness: 0.25 um; Data type: Linear RI; Authors: Ott, A.; Fay, L.B. IR transmission spectra were recorded with a Thermo iS50 spectrometer as 64–100 scans ratioed against the spectrum of the blank substrate, with measurements being made from 5000 to 600 cm−1 at a resolution of 1 cm−1.