Category: Pyrazines

Gao, Xianli published the artcileAccelerating aroma formation of raw soy sauce using low intensity sonication, Quality Control of 14667-55-1, the main research area is Zygosaccharomyces Tetragenococcus sonication aroma; Aroma compound; Sonication; Soy sauce; Tetragenococcus halophilus; Zygosaccharomyces rouxii.

Sonication was applied to accelerate aroma formation and shorten fermentation time of soy sauce. Effects of sonication at 68 kHz on the aroma and aroma-producing Zygosaccharomyces rouxii and Tetragenococcus halophilus in moromis were investigated using sensory evaluation, SPME-GC-olfactometry/MS, viable cell counting and SEM. The sensory scores of caramel-like, fruity, alc., floral, malty, smoky, sour and overall aroma in sonicated moromis were enhanced by 23.4%, 23.2%, 13.6%, 12.8%, 7.6%, 6.3%, 5.6% and 14.4%, resp. Sensory scores of samples fermented for 90-180 days were higher than those of controls fermented for 180 days, suggesting that sonication could reduce fermentation time by 90 days. Thirty-four aroma-active compounds were detected from 85 volatile compounds in soy sauces. Sonication accelerated and elevated the formation of aroma compounds by chem. reactions. It also markedly increased the reproduction and cell permeability of both microorganisms in moromis, which favored the formation of aroma compounds by both strains.

Food Chemistry published new progress about Flavoring materials, caramel flavor. 14667-55-1 belongs to class pyrazines, name is 2,3,5-Trimethylpyrazine, and the molecular formula is C7H10N2, Quality Control of 14667-55-1.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Son, Se In published the artcileActivity-guided design of HDAC11-specific inhibitors, Application of 2-Chloro-5-(trifluoromethyl)pyrazine, the main research area is HDAC11 inhibitor histone dacetylase.

Mammalian histone deacetylases (HDACs) are a class of enzymes that play important roles in biol. pathways. Existing HDAC inhibitors target multiple HDACs without much selectivity. Inhibitors that target one particular HDAC will be useful for investigating the biol. functions of HDACs and for developing better therapeutics. Here, we report the development of HDAC11-specific inhibitors using an activity-guided rational design approach. The enzymic activity and biol. function of HDAC11 have been little known, but recent reports suggest that it has efficient defatty-acylation activity and that inhibiting it could be useful for treating a variety of human diseases, including viral infection, multiple sclerosis, and metabolic diseases. Our best inhibitor, SIS17(I), is active in cells and inhibited the demyristoylation of a known HDAC11 substrate, serine hydroxymethyl transferase 2, without inhibiting other HDACs. The activity-guided design may also be useful for the development of isoform-specific inhibitors for other classes of enzymes.

ACS Chemical Biology published new progress about Histone deacetylase inhibitors. 799557-87-2 belongs to class pyrazines, name is 2-Chloro-5-(trifluoromethyl)pyrazine, and the molecular formula is C5H2ClF3N2, Application of 2-Chloro-5-(trifluoromethyl)pyrazine.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Martinez, Silvia Juliana published the artcileNovel stainless steel tanks enhances coffee fermentation quality, Product Details of C7H10N2, the main research area is stainless steel tank coffee fermentation quality; Bioreactors; Natural process; Pulped natural process; Volatile precursors; Yeast starters.

Fermenting in bioreactors can improve coffee quality, standardize the fermentation process, and generate specialty coffees. This work aimed to evaluate novel stainless steel bioreactors with inoculated and non-inoculated coffees processed via natural and pulped natural. Yeast and bacteria populations were evaluated and grown on Yeast Extract Peptone Glucose; De Man, Rogosa, and Sharpe; and Nutrient agar media. Volatile compounds from roasted beans were analyzed in a Gas Chromatog.-Mass Spectrometry equipment, and the sensory perception was evaluated through a cup test. The mesophilic bacteria population was statistically significant in pulped natural coffee compared to yeast and lactic acid bacteria. Furans had the highest concentration among the chem. groups. Beverage inoculated with CCMA 0535 presented the highest SCA score. Prune, peach, and floral attributes were only perceived in Nat CCMA 0535. The sensory perception indicated that the inoculated yeasts modified the flavor attributes, enhanced the quality, and increase their SCA scores.

Food Research International published new progress about Bioreactors (stainless steel). 14667-55-1 belongs to class pyrazines, name is 2,3,5-Trimethylpyrazine, and the molecular formula is C7H10N2, Product Details of C7H10N2.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Long, Madeline F. published the artcileDiscovery of a novel 2,4-dimethylquinoline-6-carboxamide M4 positive allosteric modulator (PAM) chemotype via scaffold hopping, Safety of 2-Chloro-5-(trifluoromethyl)pyrazine, the main research area is dimethylquinoline carboxamide derivative preparation muscarinic M4 receptor CNS; M(4); Muscarinic acetylcholine receptor; Positive allosteric modulator (PAM); Structure-Activity Relationship (SAR).

This Letter details our efforts to replace the 3-amino moiety, an essential pharmacophore for M4 PAM activity in most M4 PAMs to date, within the thieno[2,3-b]pyridine core, as the β-amino carboxamide motif has been shown to engender poor solubility, varying degrees of P-gp efflux and represents a structural alert. A scaffold hopping exercise identified a novel 2,4-dimethylquinoline carboxamide core that provided M4 PAM activity and good CNS penetration without an amino moiety. In addition, MacMillan photoredox catalysis chem. was essential for construction of the 2,4-dimethylquinoline core.

Bioorganic & Medicinal Chemistry Letters published new progress about Central nervous system agents. 799557-87-2 belongs to class pyrazines, name is 2-Chloro-5-(trifluoromethyl)pyrazine, and the molecular formula is C5H2ClF3N2, Safety of 2-Chloro-5-(trifluoromethyl)pyrazine.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

de la Pena, Eva published the artcileThe intensity of male-male competition may affect chemical scent constituents in the dark ventral patch of male Iberian red deer, Application of 2,3,5-Trimethylpyrazine, the main research area is male volatile chem scent constituent competitive sexual behavior.

During the mating season, Iberian red deer males (Cervus elaphus hispanicus) present a large visible dark ventral area in their abdomen. This characteristic dark-haired area is formed by the impregnation of the hair with sprayed urine and gland secretions and contains volatile compounds that can be used in intraspecific communication. Here, we used gas chromatog.-mass spectrometry (GC-MS) to describe the lipophilic chems. from the dark ventral patch of males from different populations with different levels of intrasexual competition. Amongst all the compounds found, m-cresol, benzoic acid, cholesterol and 4-hydroxy-benzenopropanoic acid were the most abundant. The proportions of these compounds varied with age as well as with the level of intra-sexual competition, independently of age. In particular, red deer males experiencing higher intra-sexual competition had lower proportions of aromatic compounds (especially m-cresol) but higher proportions of carboxylic acids on their dark bellies. Males in a high male-male competition situation, invest in volatile compounds that can reveal their age, dominance status and condition, and that, in addition, enhance this signal. On the contrary, males from low intra-sexual competition populations have chem. profiles more characteristic of young individuals. This research shows a first glance of how secretion of volatile compounds of male deer can be modulated due to the intensity of male-male competition in the population.

PLoS One published new progress about Abdomen (dark ventral patch). 14667-55-1 belongs to class pyrazines, name is 2,3,5-Trimethylpyrazine, and the molecular formula is C7H10N2, Application of 2,3,5-Trimethylpyrazine.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Zanin, Rodolfo Campos published the artcileModulation of aroma release of instant coffees through microparticles of roasted coffee oil, Formula: C7H10N2, the main research area is aroma instant cappuccino microparticle roasted coffee oil spray drying; Burst-effect; Instant cappuccino; Microencapsulation; PTR-ToF-MS; Soluble coffee; Spray drying.

We report, on the successful addition of spray-dried microparticles containing roasted coffee oil, to soluble coffee (SC) and instant cappuccino (IC), to increase and tailor aroma release. Using PTR-ToF-MS (Proton Transfer Reaction Time-of-Flight Mass Spectrometry), five parameters were defined from time series intensity for each VOC, to compare the performance of different products: total area under the curve (AUC), area under the curve of burst (AUC-burst), maximum signal intensity, final intensity (5 min), and ratio AUC-burst/AUC. Microparticles with higher loads of roasted coffee oil were effective in increasing aroma intensity in SC while, for IC, all loads of microparticles improved aroma intensity. Volatility drove the VOC release in SC, and volatility and polarity for IC. Most compounds reached maximum headspace concentration in < 16 s upon start of reconstitution. These results open new perspectives for the development of instant coffee products and demonstrate their unique aroma release characteristics. Food Chemistry published new progress about Coffee beans, roasted beans. 14667-55-1 belongs to class pyrazines, name is 2,3,5-Trimethylpyrazine, and the molecular formula is C7H10N2, Formula: C7H10N2.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Velasquez, Sebastian published the artcileVolatile and sensory characterization of roast coffees – Effects of cherry maturity, Computed Properties of 14667-55-1, the main research area is roasted coffee volatile profile cherry maturity; Coffee; Cupping; Fruit maturity; PCA; Sensory characterization; Volatile profiling.

Immature coffee cherries produce roast coffees with lower hedonic scores than those produced from mature cherries, but variation in volatile and sensory characteristics over a range of maturities is not well studied. In this work, cherries from two coffee cultivars (Caturra, Catimor) were sorted into seven maturity stages from fully immature (Stage 1, green) to fully overripe (Stage 7, purple). Volatile profiles of Stage 1 roast coffee had lower concentrations of carbohydrate degradation products and higher concentrations of N-heterocycles and phenols. Differences in volatiles among Stage 2 (partially immature, yellow-green) and subsequent stages were insignificant (p > 0.05) or else minor. Principle component anal. of the volatile data set also distinguished Stage 1 from other stages. Similarly, a trained cupping panel reported significantly lower sensory scores for Stage 1 as compared to Stages 2-7, but few differences among Stages 2-7. Thus, partially mature and overripe cherries may be appropriate for specialty coffee.

Food Chemistry published new progress about Coffee beans, roasted beans. 14667-55-1 belongs to class pyrazines, name is 2,3,5-Trimethylpyrazine, and the molecular formula is C7H10N2, Computed Properties of 14667-55-1.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Sgorbini, Barbara published the artcileStrategies for accurate quantitation of volatiles from foods and plant-origin materials: A challenging task, Formula: C7H10N2, the main research area is volatile food plant GC MS solid phase microextraction; accurate quantitation of volatiles; food volatiles; gas chromatography−mass spectrometry; multiple headspace solid phase microextraction.

The volatile fraction of foods and of plant-origin materials provides functional information on sample-related variables, and gas-phase extractions are ideal approaches for its accurate chem. characterization. However, for gas-phase sampling, the usual procedures adopted to standardize results from solvent extraction methods are not appropriate: headspace (HS) composition depends on the intrinsic physicochem. analyte properties (volatility, polarity, partition coefficient(s)) and matrix effects. Method development, design, and expression of the results are therefore challenging. This review article focuses on volatile vapor-phase quantitation methods (internal standard normalization, standard addition, stable isotope dilution assay, multiple headspace extraction) and their suitability in different applications. Because of the analyte informative role, the different ways of expressing results (normalized chromatog. area, percent normalized chromatog. areas, and absolute concentrations) are discussed and critically evaluated with examples of quality markers in chamomile, process contaminants (furan and 2-methylfuran) in roasted coffee, and key-aroma compounds from high-quality cocoa.

Journal of Agricultural and Food Chemistry published new progress about Coffee beans, roasted beans. 14667-55-1 belongs to class pyrazines, name is 2,3,5-Trimethylpyrazine, and the molecular formula is C7H10N2, Formula: C7H10N2.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Zhu, JianCai published the artcileCharacterization of the key aroma compounds in Laoshan green teas by application of odour activity value (OAV), gas chromatography-mass spectrometry-olfactometry (GC-MS-O) and comprehensive two-dimensional gas chromatography mass spectrometry (GC x GC-qMS), Application In Synthesis of 14667-55-1, the main research area is nonanol decanal skatole furaneol Laoshan green tea aroma olfactometry; Characteristic aroma compound; Comprehensive two-dimensional gas chromatography mass spectrometry (GC × GC-qMS); Laoshan green tea; Odor activity value (OAV); S-curve.

To investigate the key aroma compounds in Laoshan green teas (Huangshan (S1), Changling (S2), and Fangling (S3)), gas chromatog.-mass spectrometry-olfactometry (GC-MS-O), a flame photometric detector (FPD), odor activity value (OAV), and comprehensive two-dimensional gas chromatog. mass spectrometry (GC x GC-qMS) were employed. A total of 50 aroma compounds were perceived and 24 compounds were identified as important compounds related to OAV, such as di-Me sulfide (OAV: 126-146), skatole (OAV: 27-50), furaneol (OAV: 8-27), (Z)-jasmone (OAV: 16-23), 2-methylbutanal (OAV: 15-22), and 3-methylbutanal (OAV: 68-87). Furthermore, the S-curve method was used to research the effect of aroma compounds on the threshold of aroma recombination (AR). The AR thresholds decreased from 3.8 mL to 0.45, 0.66, 0.93, 0.95, 0.75, 1.09, 3.01, and 2.57 mL after addition of eight compounds (skatole, furaneol, (Z)-jasmone, α-damascenone, sclareololide, dihydroactinidiolide, vanillin, and δ-valerolactone), indicating that those compounds (OAV >1) were contributors to the overall aroma of Laoshan teas.

Food Chemistry published new progress about Flame photometric detectors. 14667-55-1 belongs to class pyrazines, name is 2,3,5-Trimethylpyrazine, and the molecular formula is C7H10N2, Application In Synthesis of 14667-55-1.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Sonmezdag, Ahmet Salih published the artcileElucidation of hulling-induced changes in the aroma and aroma-active compounds of cv. Uzun pistachio (Pistacia vera), SDS of cas: 14667-55-1, the main research area is Pistacia aroma dry hulling method terpene pyrazine; extraction methods; key odorants; pistachio; process; volatile.

BACKGROUND : The purpose of this study was to define the effects of the hulling process on the aroma and aroma-active composition of cv. Uzun pistachio. Four different hulling processes, namely wet, wet-dry, dry-dry and brine, were applied. In addition, solvent-assisted flavor evaporation (SAFE), simultaneous distillation/extraction (SDE) and purge and trap (P&T) extraction methods were also tested to obtain the best representative aroma extract RESULTS : The results revealed that the dry-dry hulling method was the most prominent according to the aroma and aroma-active compounds, and this was especially the case with terpene compounds The method increased the content of terpenes, pyrazines and total aroma compounds By application of aroma extract dilution anal. (AEDA), a total of 18 compounds were detected, of which 11 were identified for the first time in the fruit of pistachio. 2,3-Dimethylpyrazine, trimethylpyrazine and 2-ethyl-3,5-dimethylpyrazine were the compounds that had the highest flavor dilution factors. CONCLUSION : In general, the results of the present research indicated that the hulling method highly affected the overall aroma structure of pistachios. The dry-dry hulling method is therefore suggested to manufacturers to obtain better pistachios with rich and high-quality aroma. © 2019 Society of Chem. Industry.

Journal of the Science of Food and Agriculture published new progress about Odor and Odorous substances. 14667-55-1 belongs to class pyrazines, name is 2,3,5-Trimethylpyrazine, and the molecular formula is C7H10N2, SDS of cas: 14667-55-1.

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem