pyrazines has been researched along with norpseudoephedrine in 1 studies
| Timeframe | Studies, this research(%) | All Research% |
|---|---|---|
| pre-1990 | 0 (0.00) | 18.7374 |
| 1990's | 0 (0.00) | 18.2507 |
| 2000's | 1 (100.00) | 29.6817 |
| 2010's | 0 (0.00) | 24.3611 |
| 2020's | 0 (0.00) | 2.80 |
| Authors | Studies |
|---|---|
| Ding, MY; Li, HX; Lv, K; Yu, JY | 1 |
1 other study(ies) available for pyrazines and norpseudoephedrine
| Article | Year |
|---|---|
Separation and determination of ephedrine alkaloids and tetramethylpyrazine in Ephedra sinica Stapf by gas chromatography-mass spectrometry.
Topics: Ephedrine; Gas Chromatography-Mass Spectrometry; Helium; Phenylpropanolamine; Plant Extracts; Plants, Medicinal; Pyrazines; Quality Control; Reproducibility of Results | 2001 |