Quantitative Analysis of Protein Phosphorylation in Mouse Brain by Hypothesis-Driven Multistage Mass Spectrometry

2005 ◽  
Vol 77 (24) ◽  
pp. 7845-7851 ◽  
Author(s):  
Mi Jin ◽  
Helen Bateup ◽  
Júlio C. Padovan ◽  
Paul Greengard ◽  
Angus C. Nairn ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Quantitative Analysis ◽  
Protein Phosphorylation ◽  
Mouse Brain

scholarly journals Quantitative Analysis of Pyrazines and Their Perceptual Interactions in Soy Sauce Aroma Type Baijiu

Foods ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 441
Author(s):  
Yan Yan ◽  
Shuang Chen ◽  
Yao Nie ◽  
Yan Xu
Keyword(s):  
Mass Spectrometry ◽  
Quantitative Analysis ◽  
Ultra Performance Liquid Chromatography ◽  
Alcohol Solution ◽  
Soy Sauce ◽  
Tandem Mass ◽  
Odor Thresholds ◽  
Quantitative Results ◽  
Odor Activity Value ◽  
The Impact

Pyrazines are important compounds in soy sauce aroma type Baijiu (SSAB). In this work, a total of 16 pyrazines were analyzed using ultra-performance liquid chromatography coupled with tandem mass spectrometry (UPLC–MS/MS) in SSAB. The quantitative results showed that 2,3,5,6-tetramethylpyrazine, 2,6-dimethylpyrazine and 2,3,5-trimethylpyrazine were the three most concentrated pyrazines. The highest odor activity value (OAV) was determined for 2-ethyl-3,5-dimethylpyrazine. Quantitative analysis combined with descriptive sensory analysis revealed that sub-threshold pyrazines (2,3-dimethylpyrazine, 2,3-diethylpyrazine, 2,3-diethyl-5-methylpyrazine and 2-acetyl-3-methylpyrazine) are significantly correlated with the roasted aroma in SSAB. Our study focused on the impact of sub-threshold pyrazines on the perception of roasted aroma in SSAB. The effect of the sub-threshold pyrazines was detected by the addition of various pyrazines in SSAB samples, despite their sub-threshold concentrations. Furthermore, the presence of sub-threshold pyrazines in dilute alcohol solution resulted in a significant reduction in the odor thresholds of supra-threshold pyrazines. Sensory investigation indicated that pyrazines have a synergistic effect on the perception of roasted aroma. The results highlighted the contribution of some pyrazines to the roasted aroma in SSAB despite their sub-threshold concentrations.

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