Category: 638-02-8

Detailed characterization of sulfur compounds in fast pyrolysis bio-oils using GC × GC-SCD and GC-MS was written by Auersvald, Milos;Kejla, Lukas;Eschenbacher, Andreas;Thi, Hang Dao;Van Geem, Kevin M.;Simacek, Pavel. And the article was included in Journal of Analytical and Applied Pyrolysis in 2021.COA of Formula: C6H8S The following contents are mentioned in the article:

Only trace amounts of sulfur (tens to thousands of ppm) are present in bio-oils produced from fast pyrolysis of lignocellulosic biomass. However, even such small amounts of sulfur-containing compounds can act as catalytic poisons during bio-oil upgrading. To improve the knowledge of sulfur speciation in bio-oils for process design and development, e.g. by hydrotreatment, comprehensive two-dimensional gas chromatog. (GC ×GC) coupled with selective sulfur chemiluminescence detector (SCD) and headspace gas chromatog. coupled to a quadrupole mass spectrometry (GC-MS) were combined. This allowed to quantify sulfur-containing compounds present in crude bio-oils produced from different types of biomass (beech wood, miscanthus, and straw) and straw bio-oil after hydrotreatment. Hydrogen sulfide, methanethiol, di-Me disulfide, and several thiophenes were identified and quantified as the most abundant sulfur compounds The detailed anal. of the hydrotreated bio-oil prepared at 360°C and 8 MPa showed that most GC-detectable sulfur was related to hydrogen sulfide not sufficiently removed in the product separator. Used anal. methods brought an unprecedented level of details about bio-oil sulfur speciation and acquired data can help to drive further R&D in bio-oil upgrading. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8COA of Formula: C6H8S).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene finds use in research as a starting material for the synthesis of larger, usually bioactive structures. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.COA of Formula: C6H8S

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Determination of exogenous-prohibited flavour compounds added in coffee using gas chromatography triple quadrupole tandem mass spectrometry and gas chromatography/combustion/isotope ratio mass spectrometry was written by Wang, Yujiao;Liu, Tong;Chen, Fengming;Wang, Xiujuan;Zhang, Feng. And the article was included in Food Additives & Contaminants, Part A in 2020.Name: 2,5-Dimethylthiophene The following contents are mentioned in the article:

An anal. method based on gas chromatog. coupled to triple quadrupole tandem mass spectrometry (GC-MS/MS) was developed for the simultaneous determination of exogenous prohibited flavor compounds in coffee samples. In addition, gas chromatog./combustion/isotope ratio mass spectrometry (GC/C/IRMS) was developed to determine the origin of the founded prohibited flavor compound, N-methylpyrrole-2-carboxaldehyde (NMPCA). The good selectivity and sensitivity achieved in multiple reactions monitoring (MRM) mode allowed satisfactory confirmation and quantitation for the flavor compounds The limits of detection (LODs) and limits of quantitation (LOQs) of these compounds were in the range of 0.0005-5.0μg/kg and 0.002-16.0μg/kg, resp. The coffee samples were extracted with simultaneous distillation extraction (SDE) and NMPCA was analyzed on a GC/C/IRMS system. The δ¹³C values of endogenous NMPCA in coffee beans were within a range of -35.0% to -31.1%, whereas exogenous NMPCA was the range from -27.9% to -23.9%. The validation results revealed that the GC-MS/MS method was sensitive and reliable, and the origin of NMPCA can be distinguished by GC/C/IRMS. Finally, this method was successfully applied to coffee samples anal. and NMPCA was found in coffee samples. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Name: 2,5-Dimethylthiophene).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene scaffolds are of great importance due to its increased presence in bioactive molecules. It is found within the chemical structures of pharmaceutical drugs such as zileuton, raloxifene, and sertaconazole, and also BTCP.Name: 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Analysis of organic sulphur compounds in coal tar by using comprehensive two-dimensional gas chromatography-high resolution time-of-flight mass spectrometry was written by Aloisi, Ivan;Zoccali, Mariosimone;Tranchida, Peter Q.;Mondello, Luigi. And the article was included in Separations in 2020.Computed Properties of C6H8S The following contents are mentioned in the article:

Coal tar is a complex mixture of organic compounds obtained from the thermal treatment of coal; it contains several different chem. classes of compounds, such as polycyclic aromatic hydrocarbons, phenols and different heterocyclic compounds including sulfur derivatives In the present research, a target anal. was carried out for the characterization of fourteen different classes of organic sulfur compounds in coal tar by using cryogenically-modulated (CM) comprehensive two-dimensional gas chromatog.-high resolution time-of-flight mass spectrometry (GCxGC-HR ToFMS) with the support of target analyte finding, a specific software function. Furthermore, absolute quantification data were obtained by using eight pure standard sulfur compounds, and 1-fluoronaphthalene as internal standard Several figures-of-merit of the proposed method were measured (linearity, intra-day precision, limits of detection and quantification). Finally, the overall anal. performance of CM GCxGC-HR ToFMS was evaluated, in relation to MS similarities, mass accuracies, second-dimension peak widths, peak capacity and tailing factors. The approach proved itself as being a powerful anal. platform, benefiting from the high sensitivity, selectivity and resolving power, of both the GC and MS sides. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Computed Properties of C6H8S).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophenes are valuable heterocycles that are widely used in medicines, agrochemicals, and materials science. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.Computed Properties of C6H8S

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Quality comparison of “Laba” garlic processed by High Hydrostatic Pressure and High Pressure Carbon Dioxide was written by Tao, Dandan;Li, Fangwei;Hu, Xiaosong;Liao, Xiaojun;Zhang, Yan. And the article was included in Scientific Reports in 2020.COA of Formula: C6H8S The following contents are mentioned in the article:

Abstract: The production of “Laba” garlic is limited to the homemade method with long processing time and non-uniform color quality. Innovative food processing technologies including high hydrostatic pressure (HHP) and high pressure carbon dioxide (HPCD) were applied to the processing of “Laba” garlic. Products prepared at different treatment pressures (200, 350 and 500 MPa of HHP; 4, 7 and 10 MPa of HPCD) were compared by evaluating the texture, color, flavor and sensory qualities. The results indicated that HHP treatment at 200 MPa was optimal for retaining the textural quality of “Laba” garlic, which was mainly attributed to the compacted cells and the increased Ca²⁺-cross linked cell-cell adhesion. HHP had greater effect on facilitating the formation of the attractive green color of “Laba” garlic than HPCD. The flavor profiles of “Laba” garlic were modified after treatments, with pungent compounds decreased to non-detectable. The results from sensory study confirmed that “Laba” garlic treated by HHP at 200 MPa was most acceptable to consumers. Moreover, considering the treatment capacity and feasibility of commercialization, HHP would be a promising technol. in production of “Laba” garlic with improved quality and efficiency. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8COA of Formula: C6H8S).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene finds use in research as a starting material for the synthesis of larger, usually bioactive structures. It is found within the chemical structures of pharmaceutical drugs such as zileuton, raloxifene, and sertaconazole, and also BTCP.COA of Formula: C6H8S

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Impact of donor-acceptor alternation on optical power limiting behavior of H-Shaped thiophene-imidazo[2,1-b] [1,3,4]thiadiazole flanked conjugated oligomers was written by Kakekochi, Viprabha;Nikhil P, P.;Chandrasekharan, Keloth;Kumar D, Udaya. And the article was included in Dyes and Pigments in 2020.Electric Literature of C6H8S The following contents are mentioned in the article:

A new series of four D-A-D configured conjugated oligomers with H-type structure, possessing two thiophene-imidazo [2,1-b][1,3,4]thiadiazole branches and thiophene (TIT), thiophene-1,3,4-oxadiazole-thiophene (TITO), thiazolo [5,4-d]thiazole (TITz), phenyl-thiazolo [5,4-d]thiazole-Ph (TIPTz) units as central core moieties were efficiently synthesized. These core moieties were specifically selected to increase the planarity, rigidity, stability, extend the π-conjugation and to understand the influence of central core on nonlinear absorption coefficient (β_eff) and optical limiting behavior of the synthesized oligomers. The structure-property relationships of these oligomers were established by the optical absorption (UV-Vis), electrochem. (CV) and theor. (DFT) studies. The “effective two-photon absorption” of oligomers was confirmed by single-beam Z-scan anal. The exceptional increase in nonlinear response was achieved with the oligomers TITO and TIPTz with nonlinear absorption coefficient (β_eff) of 1.62 and 2.71 x 10^-10 m W^-1, and limiting thresholds of 6.02 and 3.14 J cm^-2, resp., which suggest that these oligomers could be potent materials for practical applications in laser photonics. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Electric Literature of C6H8S).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene scaffolds are of great importance due to its increased presence in bioactive molecules. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, and sertaconazole, and also BTCP.Electric Literature of C6H8S

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Solid Phase Micro-extraction – Gas Chromatography-Mass Spectrometry to Characterize Pyrolysis Products from Textiles was written by Goltz, Douglas M.;Bradford, Brock H.;Ahmadi, Shokoufeh;Henderson, Anna R. P.;Duffy, Stephen J.. And the article was included in Analytical Letters in 2017.Recommanded Product: 2,5-Dimethylthiophene The following contents are mentioned in the article:

Headspace solid phase micro-extraction gas chromatog.-mass spectrometry (HS-SPME GC-MS) was used for identifying thermally labile volatile compounds from cotton, wool, polyester, olefin, silk, and acrylic. Volatile compounds were generated from the textiles using a pyrolysis apparatus prior to GC-MS. Pyrolysis temperatures ranged from 190 to 550°C. Each textile displayed a unique chromatogram containing compounds that were consistent with the chem. structure of the textile. Exptl. parameters that were investigated included the temperature, sample size, and sampling time to determine their effect on the number and intensity of peaks in the chromatograms as well as to identify optimum conditions for anal. Heating of each sample was achieved using a resistively heated Pt wire. Full pyrolysis at 550°C of the textiles appeared to give the best results in terms of peak height relative to background. A range of sample sizes (0.02-1.5 mg) were used and, generally, ≤0.02 mg was used for identifying the textiles. The reproducibility of retention times for selected compounds in the chromatograms was less than 1% relative standard deviation. The combination with mass spectrometry provided valuable structural information. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Recommanded Product: 2,5-Dimethylthiophene).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The electrophilic substitution of benzothiophene systems is much less regioselective than that of indoles. The different substitution patterns in these heterocycles offer new opportunities for drug discovery and other applications in materials science.Recommanded Product: 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Flow injection gas chromatography with sulfur chemiluminescence detection for the analysis of total sulfur in complex hydrocarbon matrixes was written by Hua, Yujuan;Hawryluk, Myron;Gras, Ronda;Shearer, Randall;Luong, Jim. And the article was included in Journal of Separation Science in 2018.Application In Synthesis of 2,5-Dimethylthiophene The following contents are mentioned in the article:

A fast and reliable anal. technique for the determination of total sulfur levels in complex hydrocarbon matrixes is introduced. The method employed flow injection technique using a gas chromatograph as a sample introduction device and a gas phase dual-plasma sulfur chemiluminescence detector for sulfur quantification. Using the technique described, total sulfur measurement in challenging hydrocarbon matrixes can be achieved in <10 s with sample-to-sample time <2 min. The high degree of selectivity and sensitivity toward sulfur compounds of the detector offers the ability to measure low sulfur levels with a detection limit in the range of 20 ppb weight/weight S. The equimolar response characteristic of the detector allows the quantitation of unknown sulfur compounds and simplifies the calibration process. Response is linear over a concentration range of five orders of magnitude, with a high degree of repeatability. The detector’s lack of response to hydrocarbons enables direct anal. without the need for time-consuming sample preparation and chromatog. separation processes. This flow injection-based sulfur chemiluminescence detection technique is ideal for fast anal. or trace sulfur anal. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Application In Synthesis of 2,5-Dimethylthiophene).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The electrophilic substitution of benzothiophene systems is much less regioselective than that of indoles. It is found within the chemical structures of pharmaceutical drugs such as zileuton, raloxifene, and sertaconazole, and also BTCP.Application In Synthesis of 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Impact of processing on odour-active compounds of a mixed tomato-onion puree was written by Koutidou, Maria;Grauwet, Tara;Van Loey, Ann;Acharya, Parag. And the article was included in Food Chemistry in 2017.Quality Control of 2,5-Dimethylthiophene The following contents are mentioned in the article:

Gas chromatog.-olfactometry revealed thirty-two odor-active compounds in a heat-processed tomato-onion puree, among which twenty-seven were identified by gas chromatog.-olfactometry-mass spectrometry (GC-O-MS) and comprehensive two-dimensional gas chromatog. coupled with time-of-flight mass spectrometry (GC × GC-TOF MS). Based on the results of two olfactometric methods, i.e. detection frequency and aroma extract dilution anal., the most potent aroma components include: di-Pr disulfide, S-Pr thioacetate, di-Me trisulfide, 1-octen-3-one, methional, di-Pr trisulfide, 4,5-dimethylthiazole, 2-phenylacetaldehyde and sotolone. Processing of mixed vegetable systems can add complexity in their aroma profiles due to (bio)chem. interactions between the components. Therefore, the impact of different processing steps (i.e. thermal blanching, all-in-one and split-stream processes) on the volatile profile and aroma of a mixed tomato-onion puree has been investigated using a GC-MS fingerprinting approach. Results showed the potential to control the aroma in a mixed tomato-onion system through process-induced enzymic modulations for producing tomato-onion food products with distinct aroma characteristics. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Quality Control of 2,5-Dimethylthiophene).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene is a fused ring compound of thiophene ring and benzene ring, which is an important class of heterocycles with advantageous structures. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, and sertaconazole, and also BTCP.Quality Control of 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Benchmarking the minimum Electron Beam (eBeam) dose required for the sterilization of space foods was written by Bhatia, Sohini S.;Wall, Kayley R.;Kerth, Chris R.;Pillai, Suresh D.. And the article was included in Radiation Physics and Chemistry in 2018.Reference of 638-02-8 The following contents are mentioned in the article:

As manned space missions extend in length, the safety, nutrition, acceptability, and shelf life of space foods are of paramount importance to NASA. Since food and mealtimes play a key role in reducing stress and boredom of prolonged missions, the quality of food in terms of appearance, flavor, texture, and aroma can have significant psychol. ramifications on astronaut performance. The FDA, which oversees space foods, currently requires a min. dose of 44 kGy for irradiated space foods. The underlying hypothesis was that com. sterility of space foods could be achieved at a significantly lower dose, and this lowered dose would pos. affect the shelf life of the product. Electron beam processed beef fajitas were used as an example NASA space food to benchmark the min. eBeam dose required for sterility. A 15 kGy dose was able to achieve an approx. 10 log reduction in Shiga-toxin-producing Escherichia coli bacteria, and a 5 log reduction in Clostridium sporogenes spores. Furthermore, accelerated shelf life testing (ASLT) to determine sensory and quality characteristics under various conditions was conducted. Using Multidimensional gas-chromatog.-olfactometry-mass spectrometry (MDGC-O-MS), numerous volatiles were shown to be dependent on the dose applied to the product. Furthermore, concentrations of off -flavor aroma compounds such as di-Me sulfide were decreased at the reduced 15 kGy dose. The results suggest that the combination of conventional cooking combined with eBeam processing (15 kGy) can achieve the safety and shelf-life objectives needed for long duration space-foods. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Reference of 638-02-8).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophenes are valuable heterocycles that are widely used in medicines, agrochemicals, and materials science. It has been used as a raw material for the synthesis of biologically active structures and is found in pharmaceuticals such as leukotriene synthesis inhibitors and antifungals, as well as in many natural products.Reference of 638-02-8

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Applications of thermal desorption coupled to comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry for hydrocarbon fingerprinting of hydraulically fractured shale rocks was written by Piotrowski, Paulina K.;Tasker, Travis L.;Burgos, William D.;Dorman, Frank L.. And the article was included in Journal of Chromatography A in 2018.SDS of cas: 638-02-8 The following contents are mentioned in the article:

Development of shale gas resources through the use of hydraulic fracturing has raised a multitude of environmental concerns and motivated research towards the understanding of shale gas systems. Previous research has demonstrated the potential of utilizing hydrocarbon distributions towards the fingerprinting of a potential environmental contamination event arising from shale gas operations. However, to apply hydrocarbon distributions from shale gas wells towards point-source identification and apportionment, a better understanding of hydrocarbon origins must be achieved. Here we present an efficient and repeatable thermal desorption method, as a sample introduction methodol. for GC × GC anal. of shale rock samples that results in comparable chromatograms to those produced by solvent extraction This novel and robust characterization technique of shale cores from Marcellus and Utica formations by thermal desorption followed by GC × GC enables the understanding of hydrocarbon speciation within the native rock with minimal sample preparation time and solvent use. The detailed shale chem. gives insight into utilizing hydrocarbon differences towards point-source identification methodologies of environmental contamination events associated with unconventional gas development. Addnl., this anal. technique may provide a more detailed anal. of hydrocarbons than what is currently implemented in the industry to pinpoint the most advantageous areas to exploit by hydraulic fracturing, yet avoiding undesirable areas such as those with a high abundance of sulfur containing compounds This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8SDS of cas: 638-02-8).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene finds use in research as a starting material for the synthesis of larger, usually bioactive structures. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.SDS of cas: 638-02-8

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem