Pyrazine, 2-methoxy-3-(1-methylethyl)-
- Formula: C8H12N2O
- Molecular weight: 152.1937
- IUPAC Standard InChI: InChI=1S/C8H12N2O/c1-6(2)7-8(11-3)10-5-4-9-7/h4-6H,1-3H3
- IUPAC Standard InChIKey: NTOPKICPEQUPPH-UHFFFAOYSA-N
- CAS Registry Number: 25773-40-4
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
View 3d structure (requires JavaScript / HTML 5) - Other names: 2-Isopropyl-3-methoxypyrazine; 2-Methoxy-3-isopropylpyrazine; 3-Isopropyl-2-methoxypyrazine
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Van Den Dool and Kratz 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 | Stabilwax | Stabilwax | FFAP |
| Column length (m) | 30. | 30. | 30. | 30. | 30. |
| Carrier gas | H2 | H2 | He | He | |
| Substrate | |||||
| Column diameter (mm) | 0.32 | 0.32 | 0.32 | 0.32 | 0.32 |
| Phase thickness (μm) | 0.5 | 0.5 | 1. | 1. | 0.25 |
| Program | 40C(5min) => 4C/min => 100C6C/min => 136C => 3C/min => 220C (10min) | 40C(5min) => 4C/min => 100C => 6C/min => 200C | 40C(2min) => 5C/min => 100C => 4C/min => 230C (10min) | 40C(2min) => 5C/min => 100C => 4C/min => 230C (10min) | 50C (2min) => 6C/min => 180C => 10C/min => 240C(10min) |
| I | 1443. | 1444. | 1465. | 1475. | 1398. |
| Reference | Escudero, Campo, et al., 2007 | Campo, Ferreira, et al., 2005 | Wang, Finn, et al., 2005 | Wang, Finn, et al., 2005 | Rhlid, Fleury, et al., 2002 |
| Comment | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI |
| Column type | Capillary | Capillary | Capillary | Capillary | Capillary |
|---|---|---|---|---|---|
| Active phase | DB-Wax | FFAP | FFAP | FFAP | FFAP |
| Column length (m) | 30. | 30. | 30. | 30. | 25. |
| Carrier gas | He | He | He | He | |
| Substrate | |||||
| Column diameter (mm) | 0.25 | 0.32 | 0.32 | 0.32 | 0.32 |
| Phase thickness (μm) | 0.25 | 0.25 | 0.25 | 0.25 | 0.5 |
| Program | 20C(30s) => fast => 60C => 4C/min => 220C (20min) | 35C (2min) => 40C/min => 60C (2min) => 6C/min => 180C (5min) => 10C/min => 230C (5min) | 35C (2min) => 40C/min => 60C (2min) => 6C/min => 180C => 10C/min => 230C (10min) | 40C(1min) => 40C/min => 60C => 6C/min => 230C | 35C (2min) => 40C/min => 60C => 6C/min => 230C (10min) |
| I | 1413. | 1427. | 1427. | 1425. | 1434. |
| Reference | Cantergiani, Brevard, et al., 2001 | Tairu, Hofmann, et al., 2000 | Buettner and Schieberle, 1999 | Jagella and Grosch, 1999 | Fickert and Schieberle, 1998 |
| Comment | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI | MSDC-RI |
| Column type | Capillary |
|---|---|
| Active phase | FFAP |
| Column length (m) | 30. |
| Carrier gas | He |
| Substrate | |
| Column diameter (mm) | 0.32 |
| Phase thickness (μm) | 0.25 |
| Program | 35C(2min) => 40C/min => 60C(2min) => 6C/min => 180C => 10C/min => 230C(10 min) |
| I | 1427. |
| Reference | Hinterholzer, Lemos, et al., 1998 |
| Comment | MSDC-RI |
References
Go To: Top, Van Den Dool and Kratz 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.
Escudero, Campo, et al., 2007
Escudero, A.; Campo, E.; Fariña, L.; Cacho, J.; Ferreira, V.,
Analytical Characterization of the Aroma of Five Premium Red Wines. Insights into the Role of Odor Families and the Concept of Fruitiness of Wines,
J. Agric. Food Chem., 2007, 55, 11, 4501-4510, https://doi.org/10.1021/jf0636418
. [all data]
Campo, Ferreira, et al., 2005
Campo, E.; Ferreira, V.; Escudero, A.; Cacho, J.,
Prediction of the wine sensory properties related to grape variety from dynamic-headspace gas chromatography-olfactometry data,
J. Agric. Food Chem., 2005, 53, 14, 5682-5690, https://doi.org/10.1021/jf047870a
. [all data]
Wang, Finn, et al., 2005
Wang, Y.; Finn, C.; Qian, M.C.,
Impact of Growing Environment on Chickasaw Blackberry ( Rubus L.) Aroma Evaluated by Gas Chromatography Olfactometry Dilution Analysis,
J. Agric. Food Chem., 2005, 53, 9, 3563-3571, https://doi.org/10.1021/jf048102m
. [all data]
Rhlid, Fleury, et al., 2002
Rhlid, R.B.; Fleury, Y.; Blank, I.; Fay, L.B.; Welti, D.H.; Vera, F.A.; Juillerat, M.A.,
Generation of roasted notes based on 2-acetyl-2-thiazoline and its precursor, 2-(1-hydroxyethyl)-4,5-dihydrothiazole, by combined bio and thermal approaches,
J. Agric. Food Chem., 2002, 50, 8, 2350-2355, https://doi.org/10.1021/jf011170d
. [all data]
Cantergiani, Brevard, et al., 2001
Cantergiani, E.; Brevard, H.; Krebs, Y.; Feria-Morales, A.; Amadò, R.; Yeretzian, C.,
Characterisation of the aroma of green Mexican coffee and identification of mouldy/earthy defect,
Eur. Food Res. Technol., 2001, 212, 6, 648-657, https://doi.org/10.1007/s002170100305
. [all data]
Tairu, Hofmann, et al., 2000
Tairu, A.O.; Hofmann, T.; Schieberle, P.,
Studies on the key odorants formed by roasting of wild mango seeds (Irvingia gabonensis),
J. Agric. Food Chem., 2000, 48, 6, 2391-2394, https://doi.org/10.1021/jf990765u
. [all data]
Buettner and Schieberle, 1999
Buettner, A.; Schieberle, P.,
Characterization of the most odor-active volatiles in fresh, hand squeezed juice of grapefruit (Citrus paradise Macfayden),
J. Agric. Food Chem., 1999, 47, 12, 5189-5193, https://doi.org/10.1021/jf990071l
. [all data]
Jagella and Grosch, 1999
Jagella, T.; Grosch, W.,
Flavour and off-flavour compounds of black and white pepper ( Piper nigrum L.) I. Evaluation of potent odorants of black pepper by dilution and concentration techniques,
Eur. Food Res. Technol., 1999, 209, 1, 16-21, https://doi.org/10.1007/s002170050449
. [all data]
Fickert and Schieberle, 1998
Fickert, B.; Schieberle, P.,
Identification of the key odorants in barley malt (caramalt) using GC/MS techniques and odour dilution analyses,
Nahrung, 1998, 42, 6, 371-375, https://doi.org/10.1002/(SICI)1521-3803(199812)42:06<371::AID-FOOD371>3.0.CO;2-V
. [all data]
Hinterholzer, Lemos, et al., 1998
Hinterholzer, A.; Lemos, T.; Schieberle, P.,
Identification of the key odorants in raw French beans and changes during cooking,
Z. Lebensm. Unters. Forsch. A, 1998, 207, 3, 219-222, https://doi.org/10.1007/s002170050322
. [all data]
Notes
Go To: Top, Van Den Dool and Kratz RI, polar column, custom temperature program, References
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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