Category: isoquinoline

El-Athman, Fatima published the artcileReaction kinetics of corrinoid-mediated deiodination of iodinated X-ray contrast media and other iodinated organic compounds, Formula: C11H9I3N2O4, the main research area is iodinated contrast media organic compound reaction kinetics corrinoid deiodination; Abiotic; Dehalogenation; Electron shuttle; Halogenated organic compound; Vitamin B(12).

Iodinated contrast media are found at considerably higher concentrations than any other pharmaceutical in waste water, surface water and bank filtrate. While the compounds are persistent to deiodination in aerobic environments, field data from bank filtration transects have demonstrated a partial deiodination in reducing soil-water environments. In a previous lab study, we have shown that this reductive deiodination is abiotically catalyzed by (free) corrinoids. We now investigated the reaction kinetics based on the decrease of the iodinated compound, the formation of deiodinated transformation products and the iodide release. The deiodination rate decreased with decreasing iodination degree with the deiodination rate constants k1 > k2 > k3. In contrast to the ICM, 2,4,6- and 2,3,5-triiodobenzoic acid, 5-amino-2,4,6-triiodoisophthalic acid and monoiodobenzoic acids did not show a complete deiodination under the same test conditions. Our results show that the deiodination strongly depends on the substitution pattern of the bound iodine atoms as well as on adjacent functional groups. Iodine atoms in ortho-position to another iodine atom or a carboxyl group were released more easily while an amino group in ortho-position inhibited the deiodination. Tests in tap water in the presence of B12 showed a much slower deiodination than in ultrapure water, most likely caused by competitive electron acceptors in the water matrix.

Chemosphere published new progress about Carboxyl group. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Formula: C11H9I3N2O4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Bhatia, Sneha published the artcileComparison of Cramer classification between Toxtree, the OECD QSAR Toolbox and expert judgment, Application of 5-Methyl-2-phenylhex-2-enal, the main research area is Toxtree OECD QSAR toolbox Cramer classification; Cramer classification; OECD QSAR Toolbox; TTC; Toxtree; in silico.

The Threshold of Toxicol. Concern (TTC) is a pragmatic approach in risk assessment. In the absence of data, it sets up levels of human exposure that are considered to have no appreciable risk to human health. The Cramer decision tree is used extensively to determine these exposure thresholds by categorizing non-carcinogenic chems. into three different structural classes. Therefore, assigning an accurate Cramer class to a material is a crucial step to preserve the integrity of the risk assessment. In this study the Cramer class of over 1000 fragrance materials across diverse chem. classes were determined by using Toxtree (TT), the OECD QSAR Toolbox (TB), and expert judgment. Disconcordance was observed between TT and the TB. A total of 165 materials (16%) showed different results from the two programs. The overall concordance for Cramer classification between TT and expert judgment is 83%, while the concordance between the TB and expert judgment is 77%. Amines, lactones and heterocycles have the lowest percent agreement with expert judgment for TT and the TB. For amines, the expert judgment agreement is 45% for TT and 55% for the TB. For heterocycles, the expert judgment agreement is 55% for TT and the TB. For lactones, the expert judgment agreement is 56% for TT and 50% for the TB. Addnl. analyses were conducted to determine the concordance within various chem. classes. Critical checkpoints in the decision tree are identified. Strategies and guidance on determining the Cramer class for various chem. classes are discussed.

Regulatory Toxicology and Pharmacology published new progress about Classification. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Application of 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Koetke, Danijela published the artcilePrioritised pharmaceuticals in German estuaries and coastal waters: Occurrence and environmental risk assessment, Name: Diatrizoic Acid, the main research area is pharmaceutical environmental risk assessment estuary coastal water pollution Germany; Baltic sea; German bight; Pharmaceuticals; Seawater; UHPLC-MS/MS.

In this study a target anal. approach with method detection limits down to 0.01 ng L-1 was developed in order to determine ultra-trace pharmaceuticals in seawater of the German coast and their estuaries. The selection of target analytes based on a prioritisation commissioned by the German Environmental Agency considering occurrence in German surface waters, production volumes and ecotoxicol. data. Using ultra-high pressure liquid chromatog. coupled to a triple quadrupole mass spectrometer equipped with an electrospray ionisation source 21 prioritised pharmaceuticals out of seven therapeutical classes (antibiotics, iodinated X-ray contrast media (ICM), analgesics, lipid reducers, antiepileptics, anticonvulsants, beta-blockers) have been detected in the low to medium ng L-1-range. The most frequently measured substance groups in the German Baltic Sea and German Bight are the ICM, represented by the non-ionic ICM iomeprol and the ionic ICM amidotrizoic acid , resp. The same pattern of substance distribution could be detected in the German Bight, the German Baltic Sea and their inflows with lower concentrations in the offshore region that are partly a result of dilution with marine water. Pharmaceuticals entering the estuaries and coastal regions are an environmental issue since data on the ecotoxicol. effects on aquatic marine organisms is limited. Especially the antibiotics clarithromycin and sulfamethoxazole could be ecotoxicol./environmentally critical

Environmental Pollution (Oxford, United Kingdom) published new progress about Coastal waters. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Name: Diatrizoic Acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Jiang, Ming published the artcileTwo-Dimensional Retention Indices Improve Component Identification in Comprehensive Two-Dimensional Gas Chromatography of Saffron, Safety of 5-Methyl-2-phenylhex-2-enal, the main research area is saffron two dimensional gas chromatog mass spectrometry.

Comprehensive two-dimensional gas chromatog. hyphenated with accurate mass time-of-flight mass spectrometry (GC × GC-accTOFMS) was applied for improved anal. accuracy of saffron anal., by using retention indexes in the two-dimensional separation This constitutes 3 dimensions of identification. In addition to accTOFMS specificity, and first dimension retention indexes (1I), a simple method involving direct multiple injections with stepwise isothermal temperature programming is described for construction of isovolatility curves for reference alkane series in GC × GC. This gives access to calculated second dimension retention indexes (2I). Reliability of the calculated 2I was evaluated by using a Grob test mixture, and saturated alkanes, revealing good correlation between previously reported I values from the literature, with R2 correlation being 0.9997. This essentially recognizes the retention property of peaks in the GC × GC 2D space as being reducible to a retention index in each dimension, which should be a valuable tool supporting identification. The benefit of 2I data, in supplementing 1I and MS library matching, was clearly demonstrated by the progressive reduction of the number of possible compound matches for peaks observed in saffron. 114 Analytes were assessed according to 1I and 2I values within ±20 index unit of reference values, and by MS spectrum matching above a match statistic of 750 (including mass accuracy of the mol. ion <20 ppm) and their possible identities derived. The described method provides a new avenue to utilize the full capability of the two-dimensional separation (GC × GC), in combination with MS library matching in complex sample anal., to provide improved component identification. Analytical Chemistry (Washington, DC, United States) published new progress about Crocus sativus. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Safety of 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Fucke, Katharina published the artcileInsights into the Crystallisation Process from Anhydrous, Hydrated and Solvated Crystal Forms of Diatrizoic Acid, Application In Synthesis of 117-96-4, the main research area is crystallization solvation mol structure crystal growth polymorphism diatrizoic acid; crystallography; halogen bonds; lattice energy calculation; neutron diffraction; polymorphism.

Diatrizoic acid (DTA), a clin. used X-ray contrast agent, crystallizes in two hydrated, three anhydrous and nine solvated solid forms, all of which have been characterized by X-ray crystallog. Single-crystal neutron structures of DTA dihydrate and monosodium DTA tetrahydrate have been determined All of the solid-state structures have been analyzed using partial at. charges and hardness algorithm (PACHA) calculations Even though in general all DTA crystal forms reveal similar intermol. interactions, the overall crystal packing differs considerably from form to form. The water of the dihydrate is encapsulated between a pair of host mols., which calculations reveal to be an extraordinarily stable motif. DTA presents functionalities that enable hydrogen and halogen bonding, and while an extended hydrogen-bonding network is realized in all crystal forms, halogen bonding is not present in the hydrated crystal forms. This is due to the formation of a hydrogen-bonding network based on individual enclosed water squares, which is not amenable to the concomitant formation of halogen bonds. The main interaction in the solvates involves the carboxylic acid, which corroborates the hypothesis that this strong interaction is the last one to be broken during the crystal desolvation and nucleation process.

Chemistry – A European Journal published new progress about Crystal growth. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Application In Synthesis of 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Albak, F. published the artcileVariation of total aroma and polyphenol content of dark chocolate during three phase of conching, Name: 5-Methyl-2-phenylhex-2-enal, the main research area is polyphenol caffeine theobromine aroma conching dark chocolate; Aroma; Caffein; Dark chocolate; Phases of conching; Polyphenol and theobromine.

Variation in the volatiles, total polyphenol, theobromine and caffeine was investigated both qual. and quant. for all phases of conching with GC/MS/SPME, HPLC, GC/O, and UV-visible spectrophotometry. The volatile compounds being identified during the three phases consisted of aldehydes, ketones, pyrazines, acids, alcs. and esters. The number and concentration of these compounds were observed to be 31-25,681 ppb, 44-34,838 ppb and 44-29,809 ppb in the dry, pasty, and liquid phases resp. The odor of dark chocolate was described as nutty, sweet, caramel, green and chocolate using olfactometry. The percent decrease in the concentration of total polyphenol, caffeine and theobromine was observed to be only 3.0, 11.0, and 32.0 resp.

Journal of Food Science and Technology (New Delhi, India) published new progress about Dark chocolate. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Name: 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

McManaman, Karlie M. published the artcileEffect of Extraction Procedure and Gas Chromatography Temperature Program on Discrimination of MDMA Exhibits, Recommanded Product: 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde, the main research area is forensic extraction gas chromatog MDMA.

Anal. of impurities in seized MDMA tablets can be used to determine the synthesis method used and to identify links among exhibits. However, no standardized method exists to generate impurity profiles, limiting comparisons among different laboratories This research investigated the effect of extraction procedure and gas chromatog. temperature program on the resulting impurity profiles. Five exhibits were extracted using liquid-liquid extraction (LLE) and headspace solid-phase microextraction (HS-SPME), then analyzed using two different temperature programs. Profiles were statistically assessed using principal components anal. While LLE was more reproducible, more compounds were extracted using HS-SPME, thus providing more informative chem. profiles. The longer temperature program (53 min vs. 36 min) allowed greater discrimination of exhibits, due to improved precision as a result of an extended hold time (12 min). This research further highlights the need for standardized extraction and anal. procedures to allow comparison of chem. profiles generated in different laboratories

Journal of Forensic Sciences published new progress about Drugs of abuse. 1205-17-0 belongs to class isoquinoline, name is 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde, and the molecular formula is C11H12O3, Recommanded Product: 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Utrilla-Vazquez, Marycarmen published the artcileAnalysis of volatile compounds of five varieties of Maya cocoa during fermentation and drying processes by Venn diagram and PCA, Category: isoquinoline, the main research area is volatile compound maya cocoa during fermentation drying processes; 2-Heptanone (PubChem CID: 8051); 2-Methylbutanal (PubChem CID: 7284); 2-Nonanone (PubChem CID: 13187); Acetophenone (PubChem CID: 7410); Benzeneacetaldehyde (PubChem CID: 998); Benzonitrile (PubChem CID: 7505); Cocoa beans; Criollo and Trinitario; Fermented and unfermented; Furfural (PubChem CID: 7362); Isobutyl benzoate (PubChem CID: 61048); Trimethylpyrazine (PubChem CID: 26808); Volatile profile, aromatic quality; β-Myrcene (PubChem CID: 31253).

Fermented cocoa beans can be described as a complex matrix that integrates the chem. history of beans, their processing, and environmental factors. This study presents an anal. that aims to identify volatile compounds of five varieties of fine-aroma cocoa types. The cocoa types studied were Carmelo, Rojo Samuel, Lagarto, Arcoiris, Regalo de Dios, that grow in the Maya lands of Chiapas, Mexico. Profile of volatile compounds was obtained from each cacao type during fermentation and drying process. This profile of volatile compounds also was compared with beans unfermented, using a statistical anal. of Venn diagram and a multivariate Anal. of Principal Components (PCA). One hundred nine different compounds were identified by SPME-HS GC-MS, these compounds mainly related to desirable aromatic notes generated by esters, aldehydes, ketones, and alcs. The differences in chem. composition of the volatile compounds were associated mainly with the process and not to cocoa varieties. Fermented dry cocoa beans showed a higher content of esters, aldehydes, pyrazines, alcs., some acids, and furans where Lagarto (CL), Rojo Samuel (CR), and Regalo de Dios (TRD) cocoas type showed a more interesting aromatic profile. On the other hand, as expected dry unfermented cocoas presented a few numbers of aroma compounds, in the five cacao types, where alcs., ketones and hydrocarbons predominated.

Food Research International published new progress about Drying process. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Category: isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Wang, Qiuyue published the artcileLow-Temperature Catalytic Hydrogenolysis of Guaiacol to Phenol over Al-Doped SBA-15 Supported Ni Catalysts, Recommanded Product: 1,3-Dimethoxybenzene, the main research area is temperature catalytic hydrogenolysis guaiacol phenol aluminum supported nickel catalyst.

Selective hydrogenolysis of aromatic carbon-oxygen (Caryl-O) bonds is a key strategy for the generation of aromatic chems. from lignin. However, this process is usually operated at high temperatures and pressures over hydrogenation catalysts, resulting in a low selectivity for aromatics and an extra consumption of hydrogen. Here, a series of Al-doped SBA-15 mesoporous materials with different Si/Al molar ratios (Al-SBA-15) were prepared via a post-synthesis method using NaAlO2 as the Al source, and then Al-SBA-15 supported Ni catalysts (Ni/Al-SBA-15) were prepared by a deposition-precipitation method using urea as the hydrolysis reagent. The prepared supports and catalysts were extensively characterized using various techniques such as XRD, N2 adsorption/desorption, TEM, 27Al NMR, NH3-TPD, XPS, H2-TPR, and pyridine-FT-IR, and the catalysts were evaluated in the hydrogenolysis of the Caryl-O bond in guaiacol and lignin derived compounds under mild conditions. The effects of the Si/Al ratio in catalyst and reaction parameters on guaiacol conversion and product distribution were investigated in detail, associated with solvent effect. The incorporation of Al into the framework of SBA-15 can improve the Lewis acidity and the dispersion of the supported Ni particles and yet modulate the metal-support interactions, which are propitious to the hydrogenolysis of the Caryl-O bond in guaiacol. The catalyst Ni/Al-SBA-15 with a Si/Al molar ratio of 10 shows the best performance with a guaiacol conversion of 87.4% and a phenol selectivity of 76.9% under the mild conditions conducted, because of its proper acidity, suitable metal-support interactions, and high dispersion of the active species. The present study would stimulate research and development in multi-functional catalysts for the generation of valuable chems. from biomass.

ChemCatChem published new progress about Hydrogenolysis. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Recommanded Product: 1,3-Dimethoxybenzene.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Gur-Reznik, Shirra published the artcileInfluence of seasonal and operating conditions on the rejection of pharmaceutical active compounds by RO and NF membranes, Application In Synthesis of 117-96-4, the main research area is seasonal variation carbamazepine diatrizoate reverse osmosis nanofiltration wastewater treatment.

The effect of seasonal changes, ionic strength, effluent dilution, transmembrane pressure and spiked concentration on the rejection of the pharmaceutical active compounds (PhACs), carbamazepine (CBZ) and diatrizoate (DTZ) by reverse osmosis (RO) and nanofiltration (NF), was studied. They represent two families of compounds owning low/medium hydrophobicity and relatively high stability to biol. transformation at wastewater treatment plant conditions, frequently present in effluents. Experiments were performed with membrane bioreactor effluents and ultrapure water (UPW) to test the influence of background matrix on the rejection. Three RO (BW, SW and XLE) and two NF (NF90 and NF270) membranes were tested. RO exhibited high rejection of both the compounds (> 98%) regardless of membrane resolution or conditions tested. The loosest membrane tested, NF270, displayed a marked seasonal influence on CBZ rejection from effluents (up to 92% in summer and down to 50% in winter), whereas its rejection from UPW was steady (74 ± 7%). These findings strongly suggest that interactions between low/medium hydrophobicity-PhACs and effluent organic matter (EfOM) took place which markedly changed rejection efficiencies. These interactions seem to be highly correlated to EfOM quality, being enhanced during summer, increasing the removal of small PhACs even by loose nonporous membranes, but decreasing during winter, thus reducing rejection.

Desalination published new progress about Ionic strength. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Application In Synthesis of 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem