Pyrazine, 2,5-dimethyl-
- Formula: C6H8N2
- Molecular weight: 108.1411
- IUPAC Standard InChIKey: LCZUOKDVTBMCMX-UHFFFAOYSA-N
- CAS Registry Number: 123-32-0
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: 2,5-Dimethylpyrazine
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Normal alkane RI, polar column, custom temperature program
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Column type | Capillary | Capillary | Capillary | Capillary | Capillary |
---|---|---|---|---|---|
Active phase | DB-Wax | DB-Wax | HP-Innowax | HP-Innowax | DB-Wax |
Column length (m) | 30. | 30. | 60. | 60. | 30. |
Carrier gas | Hydrogen | Hydrogen | Helium | Helium | He |
Substrate | |||||
Column diameter (mm) | 0.25 | 0.25 | 0.32 | 0.32 | 0.32 |
Phase thickness (μm) | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 |
Program | 44 0C 3 0C/min -> 170 0C 8 0C/min -> 250 0C | not specified | 40 0C (5 min) 4 0C/min -> 60 0C (5 min) 8 0C/min -> 250 0C (3 min) | not specified | 45C(5min) => 5C/min => 150C => 10C/min => 240C (10min) |
I | 1322. | 1347. | 1328. | 1334. | 1281. |
Reference | Gonzalez-Rios, Suarez-Quiroz, et al., 2007 | Gonzalez-Rios, Suarez-Quiroz, et al., 2007 | Viegas and Bassoli, 2007 | Viegas and Bassoli, 2007 | Krings, Zelena, et al., 2006 |
Comment | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI |
Column type | Capillary | Capillary | Capillary | Capillary | Capillary |
---|---|---|---|---|---|
Active phase | TC-Wax | Innowax | DB-Wax | TC-Wax | Carbowax 20M |
Column length (m) | 30. | 60. | |||
Carrier gas | Helium | Helium | |||
Substrate | |||||
Column diameter (mm) | 0.25 | 0.25 | |||
Phase thickness (μm) | 0.50 | 0.25 | |||
Program | not specified | 40 0C (2 min) 10 0C/min -> 100 0C 3 0C/min -> 160 0C 5 0C/min -> 260 0C (10 min) | 60 0C (3 min) 2 0C/min -> 150 0C 4 0C/min -> 200 0C | not specified | not specified |
I | 1338. | 1334. | 1320. | 1338. | 1320. |
Reference | Kraft and Switt, 2005 | Ito and Mori, 2004 | Kim. J.H., Ahn, et al., 2004 | Tachihara, Ishizaki, et al., 2004 | Vernin, Lageot, et al., 1998 |
Comment | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI |
Column type | Capillary | Capillary | Capillary | Capillary | Capillary |
---|---|---|---|---|---|
Active phase | Carbowax 20M | Supelcowax-10 | DB-Wax | Carbowax 20M | Carbowax 400, Carbowax 20M, Carbowax 1540, Carbowax 4000, Superox 06, PEG 20M, etc. |
Column length (m) | 30. | 30. | 50. | ||
Carrier gas | He | He | Hydrogen | ||
Substrate | |||||
Column diameter (mm) | 0.32 | 0.25 | 0.32 | ||
Phase thickness (μm) | 0.25 | ||||
Program | not specified | 50C(2min) => 7C/min => 140C => 17.5C/min => 230C | not specified | not specified | not specified |
I | 1320. | 1306. | 1308. | 1290. | 1290. |
Reference | Vernin, Lageot, et al., 1998 | Chang, Seitz, et al., 1995 | Hatsuko, Kazuko, et al., 1992 | Mihara and Masuda, 1987 | Waggott and Davies, 1984 |
Comment | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI |
References
Go To: Top, Normal alkane RI, polar column, custom temperature program, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Gonzalez-Rios, Suarez-Quiroz, et al., 2007
Gonzalez-Rios, O.; Suarez-Quiroz, M.L.; Boulanger, R.; Barel, M.; Guyot, B.; Guiraud, J.-P.; Schorr-Galindo, S.,
Impact of ecological post-harvest processing of coffee aroma: II Roasted coffee.,
J. Food Composition Analysis, 2007, 20, 3-4, 297-307, https://doi.org/10.1016/j.jfca.2006.12.004
. [all data]
Viegas and Bassoli, 2007
Viegas, M.C.; Bassoli, D.G.,
Utilizacao do indice de retencao linear para caracterizacao de compostos volateis em cafe soluvel utilizando GC-MS e coluna HP-Innowax,
Quim. Nova, 2007, 30, 8, 2031-2034, https://doi.org/10.1590/S0100-40422007000800040
. [all data]
Krings, Zelena, et al., 2006
Krings, U.; Zelena, K.; Wu, S.; Berger, R.G.,
Thin-layer high-vacuum distillation to isolate volatile flavour compounds of cocoa powder,
Eur. Food Res. Technol., 2006, 223, 5, 675-681, https://doi.org/10.1007/s00217-006-0252-x
. [all data]
Kraft and Switt, 2005
Kraft, P.; Switt, K.A.D. (Eds),
Perspectives in Flavor and Fragrance Research, Wiley-VCH, Weinheim, Germany, 2005, 251. [all data]
Ito and Mori, 2004
Ito, K.; Mori, M.,
Formation of pyrazines in aqueous maltose/glucose/fructose-glutamide model systems upon heating at below 100 0C,
Food Sci. Technol. Res., 2004, 10, 2, 199-204, https://doi.org/10.3136/fstr.10.199
. [all data]
Kim. J.H., Ahn, et al., 2004
Kim. J.H.; Ahn, H.J.; Yook, H.S.; Kim, K.S.; Rhee, M.S.; Ryu, G.H.; Byun, M.W.,
Color, flavor, and sensory characteristics of gamma-irradiated salted and fermented anchovy sauce,
Radiation Phys. Chem., 2004, 69, 2, 179-187, https://doi.org/10.1016/S0969-806X(03)00400-6
. [all data]
Tachihara, Ishizaki, et al., 2004
Tachihara, T.; Ishizaki, S.; Ishikawa, M.; Kitahara, T.,
Studies on the volatile compounds of roasted spotted shrimp,
Chemistry Biodiversity, 2004, 1, 12, 2024-2033, https://doi.org/10.1002/cbdv.200490155
. [all data]
Vernin, Lageot, et al., 1998
Vernin, G.; Lageot, C.; Parkanyi, C.,
GC-MS(EI, PCI, NCI, SIM, ITMS) Data Bank Analysis of Flavors and Fragrances. Kovats indices
in Instrumental Methods on Food and Beverage Analysis, D. Wetzel, G. Charalambous, ed(s)., Elsevier Sci. B.V., Amsterdam, 1998, 245-301. [all data]
Chang, Seitz, et al., 1995
Chang, C.-Y.; Seitz, L.M.; Chambers, E., IV,
Volatile Flavor Components of Breads Made from Hard Red Winter Wheat and Hard White Winter Wheat,
Cereal Chem., 1995, 72, 3, 237-242. [all data]
Hatsuko, Kazuko, et al., 1992
Hatsuko, S.; Kazuko, H.; Masayoshi, K.; Yoshiaki, I.,
Improvement of quality of likorine extract by heat treatment,
J. Food Sci. Technol., 1992, 39, 11, 976-983, https://doi.org/10.3136/nskkk1962.39.976
. [all data]
Mihara and Masuda, 1987
Mihara, S.; Masuda, H.,
Correlation between molecular structures and retention indices of pyrazines,
J. Chromatogr., 1987, 402, 309-317, https://doi.org/10.1016/0021-9673(87)80029-8
. [all data]
Waggott and Davies, 1984
Waggott, A.; Davies, I.W.,
Identification of organic pollutants using linear temperature programmed retention indices (LTPRIs) - Part II, 1984, retrieved from http://dwi.defra.gov.uk/research/completed-research/reports/dwi0383.pdf. [all data]
Notes
Go To: Top, Normal alkane RI, polar column, custom temperature program, References
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