Category: 34413-35-9

Domeno, Celia; Aznar, Margarita; Nerin, Cristina; Isella, Francesca; Fedeli, Mauro; Bosetti, Osvaldo published an article in 2017, the title of the article was Safety by design of printed multilayer materials intended for food packaging.Name: 5,6,7,8-Tetrahydroquinoxaline And the article contains the following content:

Printing inks are commonly used in multilayer plastics materials used for food packaging, and compounds present in inks can migrate to the food either by diffusion through the multilayers or because of set-off phenomena. To avoid this problem, the right design of the packaging is crucial. This paper studies the safety by design of multilayer materials. First, the migration from four different multilayers manufactured using polyethylene terephthalate (PET), aluminum (Al) and polyethylene (PE) was determined The structural differences among materials such as the presence of inks or lacquer coatings as well as the differences in layers position allowed the study of a safety-by-design approach. Sixty-nine different compounds were detected and identified; 49 of them were not included in the pos. list of Regulation EU/10/2011 or in Swiss legislation and 15 belong to Cramer class III, which means that they have a theor. high toxicity. Some of the compounds related to ink composition were pyrene, a compound com. used to make dyes and dye precursors and the antioxidant Irganox 1300. The application of external lacquers decreased the concentration of some migrants but also brought the potential for new migrants coming from its composition A final risk assessment of the material allowed evaluating food safety for different food simulants and confirm it. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Name: 5,6,7,8-Tetrahydroquinoxaline

The Article related to printed multilayer material food packaging safety regulation, gc-ms, inks, food packaging, lacquer, risk assessment, safety by design, Food and Feed Chemistry: Packaging, Preservation, and Processing and other aspects.Name: 5,6,7,8-Tetrahydroquinoxaline

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Frost, Scott C.; Walker, Paige; Orians, Colin M.; Robbat, Jr. Albert published an article in 2022, the title of the article was The Chemistry of Green and Roasted Coffee by Selectable 1D/2D Gas Chromatography Mass Spectrometry with Spectral Deconvolution.COA of Formula: C8H10N2 And the article contains the following content:

Gas chromatog./mass spectrometry (GC/MS) is a long-standing technique for the anal. of volatile organic compounds (VOCs). When coupled with the Ion Analytics software, GC/MS provides unmatched selectivity in the anal. of complex mixtures and it reduces the reliance on high-resolution chromatog. to obtain clean mass spectra. Here, we present an application of spectral deconvolution, with mass spectral subtraction, to identify a wide array of VOCs in green and roasted coffees. Automated sequential, two-dimensional GC-GC/MS of a roasted coffee sample produced the retention index and spectrum of 750 compounds These initial analytes served as targets for subsequent coffee anal. by GC/MS. The workflow resulted in the quantitation of 511 compounds detected in two different green and roasted coffees. Of these, over 100 compounds serve as candidate differentiators of coffee quality, AAA vs. AA, as designated by the Coopedota cooperative in Costa Rica. Of these, 72 compounds survive the roasting process and can be used to discriminate green coffee quality after roasting. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).COA of Formula: C8H10N2

The Article related to roasted coffee spectral deconvolution gas chromatog mass spectrometry, 2d–gc/ms, gc/ms, coffee, coffee quality, deconvolution, green coffee, Food and Feed Chemistry: Packaging, Preservation, and Processing and other aspects.COA of Formula: C8H10N2

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

On June 3, 2016, Luo, Kai; Chen, Yao-Zhong; Chen, Li-Xian; Wu, Lei published an article.Computed Properties of 34413-35-9 The title of the article was Autoxidative C(sp2)-P Formation: Direct Phosphorylation of Heteroarenes under Oxygen, Metal-Free, and Solvent-Free Conditions. And the article contained the following:

The authors reveal here a direct autoxidative phosphorylation of heteroarenes induced by O under metal-free and solvent-free conditions. This new methodol. provides an economical, operationally simple, and environmentally friendly approach toward (Het)C(sp2)-P formation with medium to excellent yields. Heteroarenes including thiazole and quinoxaline derivatives are applicable under standard conditions, which is testified via a radical mechanism. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Computed Properties of 34413-35-9

The Article related to phosphorylation heteroarene arylphosphine oxide, heteroaryl phosphine oxide preparation, Organometallic and Organometalloidal Compounds: Phosphorus Compounds and other aspects.Computed Properties of 34413-35-9

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Houminer, Yoram; Sanders, Edward B. published an article in 1980, the title of the article was The reaction of alkylpyrazine anions with some electrophiles. Synthesis of 1,2-bis(2-pyrazyl)ethanes.Application In Synthesis of 5,6,7,8-Tetrahydroquinoxaline And the article contains the following content:

The coupling of pyrazines I (R-R2 = Me, H; R = R1 = H, R2 = Me; R = Me, R1 = R2 = H) using LiN(CHMe)2(LDA)-iodine gave II (31-43%). The treatment of I (R-R2 = Me) with LDA and O gave 21% I (R = CH2OH, R1 = R2 = Me), which was coupled with I (R = Me, R1 = R2 = H) to yield 49% III. (±)- And meso-IV were prepared by the treatment of 5,6,7,8-tetrahydroquinoxaline with LDA and O. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Application In Synthesis of 5,6,7,8-Tetrahydroquinoxaline

The Article related to dipyrazinylethane, ethane dipyrazinyl, pyrazinylethane, bisquinoxalyl, coupling quinoxaline methylpyrazine, Heterocyclic Compounds (More Than One Hetero Atom): Pyrazines and Quinoxalines and other aspects.Application In Synthesis of 5,6,7,8-Tetrahydroquinoxaline

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Wong, Jennifer M.; Bernhard, Richard A. published an article in 1988, the title of the article was Effect of nitrogen source on pyrazine formation.Name: 5,6,7,8-Tetrahydroquinoxaline And the article contains the following content:

The role of the N source in pyrazine formation in model systems containing glucose and a base was examined The distribution of pyrazines formed in the reactions of NH4OH, ammonium formate, NH4OAc, glycine, and MSG depends strongly on the nature of the N source. Pyrazines were identified by mass spectrometry and by means of Kovat’s indexes on polar and nonpolar fused silica capillary columns. A novel mechanism for a Strecker degradation and cleavage of glutamate to AcH and 2-hydroxyacetate is proposed. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Name: 5,6,7,8-Tetrahydroquinoxaline

The Article related to pyrazine formation food model nitrogen, Food and Feed Chemistry: Physical, Organic, and Inorganic Chemistry and Model Systems and other aspects.Name: 5,6,7,8-Tetrahydroquinoxaline

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Baltes, Werner; Knoch, Eberhard published an article in 1993, the title of the article was Model reactions on roast aroma formation. XIII. The formation of some uncommon N-heterocyclic compounds and furans after roasting of tryptophan with reducing sugars and sugar degradation products.COA of Formula: C8H10N2 And the article contains the following content:

After treatment of D-glucose and D-xylose with tryptophan under the conditions of coffee roasting, 311 volatile compounds were identified. Among others, quinolines, quinoxalines and carbazoles were formed. Their formation is assumed to proceed via alkylated indoles by ring enlargement reactions of intramol. cyclizations. Another group of compounds formed are bicyclic furans, furfurylamines and N-2-furfuryl-pyrroles, the mass spectra of which are listed. The pathway of tryptophan degradation, as well as the formation of the described products, is discussed. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).COA of Formula: C8H10N2

The Article related to coffee roast aroma compound model, tryptophan reducing sugar roasting aroma compound, furan aroma coffee roasting model, heterocycle aroma coffee roasting model, Food and Feed Chemistry: Physical, Organic, and Inorganic Chemistry and Model Systems and other aspects.COA of Formula: C8H10N2

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

On December 31, 1989, Huang, Tzou Chi; Bruechert, Linda J.; Ho, Chi Tang published an article.Formula: C8H10N2 The title of the article was Kinetics of pyrazine formation in amino acid-glucose systems. And the article contained the following:

The chem. and kinetics of pyrazine formation were studied in 4 amino acid-glucose model systems. Different amounts of the same alkylpyrazines were produced in the 4 systems. The most abundant alkylpyrazine generated in a glycine-glucose system was 2,3,5-trimethylpyrazine, while 2-methylpyrazine was most abundant in an arginine-glucose system and 2,5-dimethylpyrazine predominated in a histidine-glucose system. 2-Methylpyrazine and 2,5-dimethylpyrazine were the 2 most abundant alkylpyrazines in a lysine-glucose system. Kinetic data from the arginine-glucose system indicated that each of 4 selected pyrazines was formed by a pseudo-zero-order reaction. Activation energies in the same system were 19.5 ± 4.1 kcal/mol for pyrazine, 24.8 ± 8.7 for 2-methylpyrazine, 20.8 ± 4.7 for 2,6-dimethylpyrazine and 29.0 ± 3.8 for 2-methyl-6,7-dihydro-5H-cyclopentapyrazine. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Formula: C8H10N2

The Article related to pyrazine formation kinetics maillard reaction, alkylpyrazine formation kinetics maillard reaction, amino acid glucose maillard reaction pyrazine, Food and Feed Chemistry: Physical, Organic, and Inorganic Chemistry and Model Systems and other aspects.Formula: C8H10N2

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Ji, Hong; Bernhard, Richard A. published an article in 1992, the title of the article was Effect of microwave heating on pyrazine formation in a model system.Quality Control of 5,6,7,8-Tetrahydroquinoxaline And the article contains the following content:

The effect of microwave heating was contrasted with that of conventional heating in pyrazine formation in a model food Maillard system containing glucose, glycine, and base. The heating system, and the time and temperature of heating, greatly influenced pyrazine formation and pyrazine distribution. Kinetic studies indicated that pyrazine formation follows pseudo-zero order reaction rates, and this order is the same regardless of the heating method used. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Quality Control of 5,6,7,8-Tetrahydroquinoxaline

The Article related to pyrazine food flavor cooking, maillard glucose glycine pyrazine, microwave pyrazine food flavor, Food and Feed Chemistry: Physical, Organic, and Inorganic Chemistry and Model Systems and other aspects.Quality Control of 5,6,7,8-Tetrahydroquinoxaline

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

On June 30, 1987, Baltes, Werner; Bochmann, Gloria published an article.Quality Control of 5,6,7,8-Tetrahydroquinoxaline The title of the article was Model reactions on roast aroma formation. IV. Mass spectrometric identification of pyrazines from the reaction of serine and threonine with sucrose under the conditions of coffee roasting. And the article contained the following:

From the volatiles of model roastings, where serine, threonine, and sucrose (in different ratios) were treated under the conditions of coffee roasting, 123 mono- and bicyclic pyrazines were separated and identified by capillary gas chromatog. and mass spectrometry. The spectra obtained were compared with the spectra of roast coffee volatiles. Numerous compounds unknown up to now were identified, among them 12 products which, according to their behavior, were postulated to be furfurylpyrazines. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Quality Control of 5,6,7,8-Tetrahydroquinoxaline

The Article related to pyrazine aroma coffee roasting model, serine threonine sucrose pyrazine, Food and Feed Chemistry: Physical, Organic, and Inorganic Chemistry and Model Systems and other aspects.Quality Control of 5,6,7,8-Tetrahydroquinoxaline

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider

Luo, Shuai; Zhou, Hong-Yan; Wang, Le; Yu, Ai-Nong; Yang, Xiao-Hong published an article in 2012, the title of the article was Effects of urea on the formation of perfume compounds by ascorbic acid-methionine model reaction.Name: 5,6,7,8-Tetrahydroquinoxaline And the article contains the following content:

By the headspace-solid phase micro-extraction – gas chromatog. – mass spectrometry (Headspace-SPME-GC-MS) technol., this article identifies products from the model reaction between ascorbic acid and methionine (ASA-Met), and studies the impacts of urea on the formation of perfume compounds from the model reaction. 17 Perfume compounds have been identified, including pyrazine, sulfur compounds, thiophene, pyrrole and compounds containing benzene rings, of which sulfur compounds, such as alicyclic sulfides, thioether and pyrazine, are the main flavor components. For urea being added to the model system, one the one hand, the yields of some sulfur compounds will be significantly reduced; on the other hand, it promotes the production of several nitrogen compounds such as Me pyrazine, Et pyrazine and 2,6-di-Me pyrazine, and other alkyl pyrazine. This indicates that urea inhibits the thermal degradation of Met in the model reaction, and also implies that as the nitrogen source during the thermal degradation of urea NH3 may be generated. After a competing reaction occurs between NH3 and the degradation products of H2S and ASA, nitrogen compounds are formed, such as alkyl pyrazine, so as to cause the lower production of sulfur compounds The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Name: 5,6,7,8-Tetrahydroquinoxaline

The Article related to perfume compound urea ascorbic acid methionine thermal degradation, Food and Feed Chemistry: Physical, Organic, and Inorganic Chemistry and Model Systems and other aspects.Name: 5,6,7,8-Tetrahydroquinoxaline

Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider