Month: November 2022

On December 21, 2020, Omaiye, Esther E.; Luo, Wentai; McWhirter, Kevin J.; Pankow, James F.; Talbot, Prue published an article.Synthetic Route of 85-91-6 The title of the article was Electronic Cigarette Refill Fluids Sold Worldwide: Flavor Chemical Composition, Toxicity, and Hazard Analysis. And the article contained the following:

Flavor chems. in electronic cigarette (EC) fluids, which may neg. impact human health, have been studied in a limited number of countries/locations. To gain an understanding of how the composition and concentrations of flavor chems. in ECs are influenced by product sale location, we evaluated refill fluids manufactured by one company (Ritchy LTD) and purchased worldwide. Flavor chems. were identified and quantified using gas chromatog./mass spectrometry (GC/MS). We then screened the fluids for their effects on cytotoxicity (MTT assay) and proliferation (live-cell imaging) and tested authentic standards of specific flavor chems. to identify those that were cytotoxic at concentrations found in refill fluids. A total of 126 flavor chems. were detected in 103 bottles of refill fluid, and their number per/bottle ranged from 1-50 based on our target list. Two products had none of the flavor chems. on our target list, nor did they have any nontargeted flavor chems. A total of 28 flavor chems. were present at concentrations ≥1 mg/mL in at least one product, and 6 of these were present at concentrations ≥10 mg/mL. The total flavor chem. concentration was ≥1 mg/mL in 70% of the refill fluids and ≥10 mg/mL in 26%. For sub-brand duplicate bottles purchased in different countries, flavor chem. concentrations were similar and induced similar responses in the in vitro assays (cytotoxicity and cell growth inhibition). The levels of furaneol, benzyl alc., ethyl maltol, Et vanillin, corylone, and vanillin were significantly correlated with cytotoxicity. The margin of exposure calculations showed that pulegone and estragole levels were high enough in some products to present a nontrivial calculated risk for cancer. Flavor chem. concentrations in refill fluids often exceeded concentrations permitted in other consumer products. These data support the regulation of flavor chems. in EC products to reduce their potential for producing both cancer and noncancer toxicol. effects. The experimental process involved the reaction of Methyl N-Methylanthranilate(cas: 85-91-6).Synthetic Route of 85-91-6

The Article related to electronic cigarette fluid flavor toxicity hazard, Toxicology: Methods (Including Analysis) and other aspects.Synthetic Route of 85-91-6

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Yue, Qiming; Zhao, Yi; Sun, Baohou; Hai, Li; Guo, Li; Wu, Yong published an article in 2015, the title of the article was First Synthesis and Characterization of Stereoisomers of Choleretic Drug Dihydroxydibutylether.HPLC of Formula: 3976-69-0 And the article contains the following content:

The synthesis of the four stereoisomers (R)-3-((R)-3-hydroxylbutoxy)-1-butanol, (R)-3-((S)-3-hydroxylbutoxy)-1-butanol, (S)-3-((R)-3-hydroxylbutoxy)-1-butanol and (S)-3-((S)-3-hydroxylbutoxy)-1-butanol from readily available starting materials, methyl(R/S)-3-hydroxybutanoate, in 9 steps with overall yields of 13%’-‘17% was reported. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).HPLC of Formula: 3976-69-0

The Article related to hydroxylbutoxy butanol diastereoselctive preparation, Aliphatic Compounds: Ethers and Sulfides and other aspects.HPLC of Formula: 3976-69-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On January 12, 2005, Chen, Li; Wang, Qingmin; Huang, Runqiu; Mao, Chunhui; Shang, Jian; Bi, Fuchun published an article.Product Details of 141940-37-6 The title of the article was Synthesis and insecticidal evaluation of propesticides of benzoylphenylureas. And the article contained the following:

Two series of benzoylphenylurea derivatives were synthesized as candidate propesticides by a nucleophilic addition reaction between 2,6-difluronbenzoyl isocyanate and N-substituted anilines. The new compounds were identified by 1H NMR spectroscopy, electron ionization-mass spectrometry, and elemental analyses. The bioactivities of the new compounds were evaluated. All of the propesticides were soluble in most organic solvents, and their hydrophobicities were improved. The result of the bioactivities of the new compounds against Oriental armyworm showed that some of the new compounds are active as compared to diflubenzuron and penfluron. The experimental process involved the reaction of tert-Butyl (4-(trifluoromethyl)phenyl)carbamate(cas: 141940-37-6).Product Details of 141940-37-6

The Article related to benzoylphenylurea derivative preparation insecticide, Agrochemical Bioregulators: Invertebrate and other aspects.Product Details of 141940-37-6

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On January 4, 2017, Bohman, Bjorn; Flematti, Gavin R.; Unelius, C. Rikard published an article.SDS of cas: 3976-69-0 The title of the article was Practical one-pot stereospecific preparation of vicinal and 1,3-diols. And the article contained the following:

A facile one-pot synthesis providing vicinal diols and 1,3-diols in >95% stereoisomeric purity from com. available enantiopure hydroxy esters has been developed. The esters were reduced with DIBALH and alkylated in situ with 4-pentenylmagnesium bromide, which after workup generated the title diols as diastereomeric pairs. These pairs were easily separated by preparative chromatog., affording products with retained stereoisomeric purity from the starting materials. This method represents an expedient preparation of many common natural products, such as cerambycid beetle pheromones and intermediates towards bicyclic acetal bark beetle pheromones. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).SDS of cas: 3976-69-0

The Article related to diol stereoselective preparation, hydroxy ester reduction, Aliphatic Compounds: Alcohols and Thiols and other aspects.SDS of cas: 3976-69-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Kodama, Susumu; Yoshii, Nao; Ota, Akihiro; Takeshita, Jun-ichi; Yoshinari, Kouichi; Ono, Atsushi published an article in 2021, the title of the article was Association between in vitro nuclear receptor-activating profiles of chemical compounds and their in vivo hepatotoxicity in rats.Formula: C6H8O3 And the article contains the following content:

The liver plays critical roles to maintain homeostasis of living organisms and is also a major target organ of chem. toxicity. Meanwhile, nuclear receptors (NRs) are known to regulate major liver functions and also as a critical target for hepatotoxic compounds In this study, we established mammalian one-hybrid assay systems for five rat-derived NRs, namely PXR, PPARα, LXRα, FXR and RXRα, and evaluated a total of 326 compounds for their NR-activating profiles. Then, we assessed the association between their NR-activating profile and hepatotoxic endpoints in repeated-dose toxicity data of male rats from Hazard Evaluation Support System. In the in vitro cell-based assays, 68, 38, 20, 17 and 17 compounds were identified as positives for PXR, PPARα, LXRα, FXR and RXRα, resp. The association analyses demonstrated that the PXR-pos. compounds showed high frequency of endpoints related to liver hypertrophy, such as centrilobular hepatocellular hypertrophy, suggesting that PXR activation is involved in chem.-induced liver hypertrophy in rats. It is intriguing to note that the PXR-pos. compounds also showed statistically significant associations with both prolonged activated partial thromboplastin time and prolonged prothrombin time, suggesting a possible involvement of PXR in the regulation of blood clotting factors. Collectively, our approach may be useful for discovering new functions of NRs as well as understanding the complex mechanism for hepatotoxicity caused by chem. compounds The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Formula: C6H8O3

The Article related to chem compound nuclear receptor activating profile hepatotoxicity, Toxicology: Methods (Including Analysis) and other aspects.Formula: C6H8O3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Kodama, Susumu; Yoshii, Nao; Ota, Akihiro; Takeshita, Jun-ichi; Yoshinari, Kouichi; Ono, Atsushi published an article in 2021, the title of the article was Association between in vitro nuclear receptor-activating profiles of chemical compounds and their in vivo hepatotoxicity in rats.Recommanded Product: Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate And the article contains the following content:

The liver plays critical roles to maintain homeostasis of living organisms and is also a major target organ of chem. toxicity. Meanwhile, nuclear receptors (NRs) are known to regulate major liver functions and also as a critical target for hepatotoxic compounds In this study, we established mammalian one-hybrid assay systems for five rat-derived NRs, namely PXR, PPARα, LXRα, FXR and RXRα, and evaluated a total of 326 compounds for their NR-activating profiles. Then, we assessed the association between their NR-activating profile and hepatotoxic endpoints in repeated-dose toxicity data of male rats from Hazard Evaluation Support System. In the in vitro cell-based assays, 68, 38, 20, 17 and 17 compounds were identified as positives for PXR, PPARα, LXRα, FXR and RXRα, resp. The association analyses demonstrated that the PXR-pos. compounds showed high frequency of endpoints related to liver hypertrophy, such as centrilobular hepatocellular hypertrophy, suggesting that PXR activation is involved in chem.-induced liver hypertrophy in rats. It is intriguing to note that the PXR-pos. compounds also showed statistically significant associations with both prolonged activated partial thromboplastin time and prolonged prothrombin time, suggesting a possible involvement of PXR in the regulation of blood clotting factors. Collectively, our approach may be useful for discovering new functions of NRs as well as understanding the complex mechanism for hepatotoxicity caused by chem. compounds The experimental process involved the reaction of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate(cas: 3319-31-1).Recommanded Product: Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate

The Article related to chem compound nuclear receptor activating profile hepatotoxicity, Toxicology: Methods (Including Analysis) and other aspects.Recommanded Product: Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Arndt, Daniel; Wachsmuth, Christian; Buchholz, Christoph; Bentley, Mark published an article in 2020, the title of the article was A complex matrix characterization approach, applied to cigarette smoke, that integrates multiple analytical methods and compound identification strategies for non-targeted liquid chromatography with high-resolution mass spectrometry.Application In Synthesis of 3-Acetyldihydrofuran-2(3H)-one And the article contains the following content:

Rationale : For the characterization of the chem. composition of complex matrixes such as tobacco smoke, containing more than 6000 constituents, several anal. approaches have to be combined to increase compound coverage across the chem. space. Furthermore, the identification of unknown mols. requiring the implementation of addnl. confirmatory tools in the absence of reference standards, such as tandem mass spectrometry spectra comparisons and in silico prediction of mass spectra, is a major bottleneck. Methods : We applied a combination of four chromatog./ionization techniques (reversed-phase (RP) – heated electrospray ionization (HESI) in both pos. (+) and neg. (-) modes, RP – atm. pressure chem. ionization (APCI) in pos. mode, and hydrophilic interaction liquid chromatog. (HILIC) – HESI pos.) using a Thermo Q Exactive® liquid chromatog./high-resolution accurate mass spectrometry (LC/HRAM-MS) platform for the anal. of 3R4F-derived smoke. Compound identification was performed by using mass spectral libraries and in silico predicted fragments from multiple integrated databases. Results : A total of 331 compounds with semi-quant. estimates ≥100 ng per cigarette were identified, which were distributed within the known chem. space of tobacco smoke. The integration of multiple LC/HRAM-MS-based chromatog./ionization approaches combined with complementary compound identification strategies was key for maximizing the number of amenable compounds and for strengthening the level of identification confidence. A total of 50 novel compounds were identified as being present in tobacco smoke. In the absence of reference MS2 spectra, in silico MS2 spectra prediction gave a good indication for compound class and was used as an addnl. confirmatory tool for our integrated non-targeted screening (NTS) approach. Conclusions : This study presents a powerful chem. characterization approach that has been successfully applied for the identification of novel compounds in cigarette smoke. We believe that this innovative approach has general applicability and a huge potential benefit for the anal. of any complex matrixes. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Application In Synthesis of 3-Acetyldihydrofuran-2(3H)-one

The Article related to cigarette smoke composition high resolution accurate mass spectrometry, Toxicology: Methods (Including Analysis) and other aspects.Application In Synthesis of 3-Acetyldihydrofuran-2(3H)-one

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

West, Cara; Silverman, Neal published an article in 2018, the title of the article was p38b and JAK-STAT signaling protect against Invertebrate iridescent virus 6 infection in Drosophila.Product Details of 3319-31-1 And the article contains the following content:

The fruit fly Drosophila melanogaster is a powerful model system for the study of innate immunity in vector insects as well as mammals. For vector insects, it is particularly important to understand all aspects of their antiviral immune defenses, which could eventually be harnessed to control the transmission of human pathogenic viruses. The immune responses controlling RNA viruses in insects have been extensively studied, but the response to DNA virus infections is poorly characterized. Here, we report that infection of Drosophila with the DNA virus Invertebrate iridescent Virus 6 (IIV-6) triggers JAK-STAT signaling and the robust expression of the Turandots, a gene family encoding small secreted proteins. To drive JAK-STAT signaling, IIV-6 infection more immediately induced expression of the unpaireds, a family of IL-6-related cytokine genes, via a pathway that required one of the three Drosophila p38 homologs, p38b. In fact, both Stat92E and p38b were required for the survival of IIV-6 infected flies. In addition, in vitro induction of the unpaireds required an NADPH-oxidase, and in vivo studies demonstrated Nox was required for induction of TotA. These results argue that ROS production, triggered by IIV-6 infection, leads to p38b activation and unpaired expression, and subsequent JAK-STAT signaling, which ultimately protects the fly from IIV-6 infection. The experimental process involved the reaction of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate(cas: 3319-31-1).Product Details of 3319-31-1

The Article related to p38b jak stat signaling drosophila invertebrate iridescent virus infection, Immunochemistry: Allergy and Anaphylaxis and other aspects.Product Details of 3319-31-1

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On September 30, 2020, Abdi, Khosrou; Ezoddin, Maryam; Pirooznia, Nazanin published an article.Application of 118-55-8 The title of the article was Temperature-controlled liquid-liquid microextraction using a biocompatible hydrophobic deep eutectic solvent for microextraction of palladium from catalytic converter and road dust samples prior to ETAAS determination. And the article contained the following:

A simple method based on temperature-controlled liquid-liquid microextraction (TC-LLME) using a novel hydrophobic deep eutectic solvent (DES) was developed for preconcentration of palladium. Deep eutectic solvent based on Ph salicylate (salol) and DL-menthol (1:1) was used as the extraction solvent. The control of temperature enhanced the dispersion of deep eutectic solvent and a homogeneous solution was made. Upon cooling the solution in an ice bath, a cloudy solution was formed. Afterwards, the mixture was centrifuged and the sediment phase was analyzed by Electrothermal Atomic Absorption Spectroscopy (ETAAS). To improve the extraction efficiency, the main parameters were optimized. Under the optimized extraction conditions, the limit of detection (LOD) and limit of quantification (LOQ) were 0.03μg L-1 and 0.10μg L-1 resp. Preconcentration factor was obtained 191. The precision, expressed as the relative standard deviation (RSD, n = 10), found to be 4.6%. Finally, the method was an effective procedure for the determination of palladium in water, catalytic converter and road dust samples with acceptable extraction recoveries of 95.1% to 100.4%. The obtained results confirmed the ability of the developed method in the different samples. The experimental process involved the reaction of Phenyl Salicylate(cas: 118-55-8).Application of 118-55-8

The Article related to palladium catalytic converter biocompatible hydrophobic solvent road dust microextraction, Inorganic Analytical Chemistry: Reagents and other aspects.Application of 118-55-8

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On November 15, 2019, Shenouda, Hannah; Alexanian, Erik J. published an article.Name: (R)-Methyl 3-hydroxybutanoate The title of the article was Manganese-Catalyzed Stereospecific Hydroxymethylation of Alkyl Tosylates. And the article contained the following:

The development of a stereospecific hydroxymethylation of alkyl tosylates using an inexpensive, first-row catalyst is described. The transformation proceeds under mild conditions with low pressure to deliver homologated alcs. as products. Chiral, nonracemic β-branched primary alcs. are obtained with high enantiospecificity from easily accessed secondary alkyl substrates. Simple modification of the reaction system also permits access to α-d2 alcs. These studies use anionic metal carbonyl catalysis to access a synthetic equivalent of the challenging hydroxymethyl anion from carbon monoxide. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Name: (R)-Methyl 3-hydroxybutanoate

The Article related to primary alc preparation enantioselective, alkyl tosylate hydroxymethylation manganese catalyst, Aliphatic Compounds: Alcohols and Thiols and other aspects.Name: (R)-Methyl 3-hydroxybutanoate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics