Month: November 2022

On July 31, 2022, Kamel, Al Khansaa A.; Hozayen, Walaa; El-kawi, Samraa H. Abd; Hashem, Khalid S. published an article.Computed Properties of 85-91-6 The title of the article was Galaxaura elongata Extract (GE) Modulates Vanadyl Sulfate-Induced Renal Damage via Regulating TGF-β/Smads and Nrf2/NF-κB Pathways. And the article contained the following:

Nephrotoxicity becomes a provoked problem as the kidneys are the target of many chemotherapies. For this reason, we aimed to study the protective effect of Galaxaura elongata extract (GE) against the vanadyl sulfate (Van) induced nephrotoxicity in rats. Forty Wistar albino rats (male) were divided into four groups (n = 10) as follows: control group: rats received 0.5% CM-cellulose (CMC). Galaxa group: rats received GE at a dose (100 mg/kg orally) daily for 6 wk. Van group: rats injected with Van at a dose (50 mg/kg i.p.) once weekly for 6 successive weeks. Galaxa+Van group: rats received GE at a dose (100 mg/kg orally) daily for 6 wk concurrently with Van at a dose (50 mg/kg i.p.) for 6 wk. Our results showed that Van significantly raised urea and creatinine serum levels as compared to the control group as well as disordered renal oxidative/antioxidant redox. Administration of GE with Van alleviated the adverse impact of Van over the kidney tissues. Furthermore, GE administration in Galaxa+ Van group downregulates angiotensin-converting enzyme (ACE1) mRNA expression, angiotensin II (Ang II) concentration, transforming growth factor β (TGF-β) mRNA expression and protein concentration and Nuclear factor κB (NF-κB) mRNA expression as compared to Van group. Also, GE administration caused a noticeable upregulation of Nrf2 and heme oxygenase-1 (HO-1) expressions with a consequent decrease of DNA fragmentation % compared to Van group. The results of the current study show that simultaneous treatment with GE can alleviate nephrotoxicity caused by Van in diabetic rats. The GE treatment of the Van treated animals restored altered renal oxidative/antioxidant redox values towards normal and lessened fibrosis. These results are consistent with these efects being caused by interactions with the TGF-B/Smads and Nrf2/NF-κB signaling pathways. The experimental process involved the reaction of Methyl N-Methylanthranilate(cas: 85-91-6).Computed Properties of 85-91-6

The Article related to galaxaura elongata vanadyl sulfate tgfbeta smad nrf renal damage, ace1, ang ii, galaxaura elongata extract, ho-1, nf-κb, nephro toxicity, nrf2, smad3, smad7, tgf-β, vanadyl sulfate and other aspects.Computed Properties of 85-91-6

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

Abe, Haruka published an article in 2021, the title of the article was National standard and new reference material for specific heat capacity measurements.Category: esters-buliding-blocks And the article contains the following content:

Thermal anal. and calorimetry share a close relationship in the field of thermal research. With regards to the sp. heat capacity, researchers have been able to realize absolute measurement techniques by utilizing drop, conduction, and adiabatic methods that are used in calorimetry. Furthermore, it is possible to optimize differential scanning calorimetry, which is a comparative measurement technique for the sp. heat capacity used in thermal anal., by improving the absolute measurement techniques. At the National Metrol. Institute of Japan (NMIJ), we developed a new certified reference material (CRM) for comparatively measuring the sp. heat capacity, the single-crystalline silicon-NMIJ CRM 5806a, using a new type of cryogenic adiabatic calorimeter equipped with a pulse-tube refrigerator working at from 50 to 350 K. This CRM was produced in accordance with the quality specifications of NMIJ, and complies with the ISO/IEC 17025, ISO 17034, and ISO GUIDE 35 standards This paper reports on the procedure for fabricating this CRM and using it to perform sp. heat capacity measurements at low temperatures The sp. heat capacity was measured using a differential scanning calorimeter at from 280 to 340 K. NMIJ CRM 5806a was used to calibrate the heat flow. It was found that the uncertainty evaluation became easier because one factor of the uncertainty evaluation could be removed using the CRM. We show that the development of the CRM using the adiabatic calorimeter has led to an improvement in the sp. heat capacity measurement results obtained by the differential scanning calorimeter. The experimental process involved the reaction of Phenyl Salicylate(cas: 118-55-8).Category: esters-buliding-blocks

The Article related to specific heat capacity standard reference material, specific heat capacity, adiabatic calorimeter, differential scanning calorimeter, reference material, single-crystalline silicon and other aspects.Category: esters-buliding-blocks

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

On October 31, 2020, Zhang, Penghan; Carlin, Silvia; Lotti, Cesare; Mattivi, Fulvio; Vrhovsek, Urska published an article.Application In Synthesis of Methyl N-Methylanthranilate The title of the article was On sample preparation methods for fermented beverage VOCs profiling by GCxGC-TOFMS. And the article contained the following:

Aromas and tastes have crucial influences on the quality of fermented beverages. The determination of aromatic compounds requires global non-targeted profiling of the volatile organic compounds (VOCs) in the beverages. However, exptl. VOC profiling result depends on the chosen VOC collection method. This study aims to observe the impact of using different sample preparation techniques [dynamic headspace (DHS), vortex-assisted liquid-liquid microextraction (VALLME), multiple stir bar sorptive extraction (mSBSE), solid phase extraction (SPE), and solid phase micro-extraction (SPME)] to figure out the most suitable sample preparation protocol for profiling the VOCs from fermented beverages. Five common sample preparation methods were studied with beer, cider, red wine, and white wine samples. After the sample preparation, collected VOCs were analyzed by two-dimensional gas chromatog. coupled with time of flight mass spectrometry (GCxGC-TOFMS). GCxGC oven parameters can be optimized with the Box-Behnken surface response model and response measure on peak dispersion. Due to the unavoidable column and detector saturation during metabolomic anal., errors may happen during mass spectrum construction. Profiling results obtained with different sample preparation methods show considerable variance. Common findings occupy a small fraction of total annotated VOCs. For known fermentative aromas, best coverage can be reached by using SPME together with SPE for beer, and VALLME for wine and cider. GCxGC-TOFMS is a promising tool for non-targeted profiling on VOCs from fermented beverages. However, a proper data processing protocol is lacking for metabolomic anal. Each sample preparation method has a specific profiling spectrum on VOC profiling. The coverage of the VOC metabolome can be improved by combining complementary methods. The experimental process involved the reaction of Methyl N-Methylanthranilate(cas: 85-91-6).Application In Synthesis of Methyl N-Methylanthranilate

The Article related to fermented beverage sample preparation voc profiling gcxgc tofms, fermented beverages, sample preparation methods, two dimensional gas chromatography–mass spectrometry, voc profiling and other aspects.Application In Synthesis of Methyl N-Methylanthranilate

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

Kumar, Harikesh; Dubey, Atul; Prajapati, Gurudayal; Kant, Ruchir; Ampapathi, Ravi S.; Mandal, Pintu Kumar published an article in 2022, the title of the article was Regioselective direct sulfenylation of glycals using arylsulfonyl chlorides in the presence of triphenylphosphine: access to C2-thioaryl glycosides.Recommanded Product: (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate And the article contains the following content:

Direct triphenylphosphine-mediated regioselective sulfenylation of glycals by using various cheap and easily available aryl sulfonyl chlorides as a sulfur source to generate different C2-S-aryl-glycosides was developed. Notably, the features of this protocol offer a milder and easier operational procedure, and broad substrate scope with complete regioselectivity at C-2. Experiments and DFT calculations supported the proposed mechanism and regioselectivity for the formation of C2-S-aryl-glycosides. The experimental process involved the reaction of (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate(cas: 2873-29-2).Recommanded Product: (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate

The Article related to regioselective sulfenylation glycal arylsulfonyl chloride phenylphosphine aryl thioglycoside, crystal structure transition state glycal monosaccharide preparation thioaryl glycoside and other aspects.Recommanded Product: (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate

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

Schank, Kurt published an article in 1970, the title of the article was Base catalyzed rearrangement of α-acetoxy-β-oxosulfones. Signs for the intermediate existence of valence tautomeric α-acetoxyketenes.Category: esters-buliding-blocks And the article contains the following content:

Deprotonation of RCOCH(OAc)SO2R1 with tertiary bases leads to the formation of the shortlived intermediates RCOC-(OAc)SO2R1 ⇌ RC(O-):C(OAc)SO2R1 (I), which were trapped by azo coupling with p-N2+C6H4Cl to give RCO(AcO)C(SO2R1)N:NC6H4Cl-p (where R = Ph, C6H4CH:CH, p-MeOC6H4, or p-O2NC6H4 and R1 = Ph or p-MeC6H4). In inert solvents the tautomeric anions I undergo a fast acyl migration followed by elimination of RSO2-. The formation of the very reactive R(AcO)C:CO (II) is assumed, which can react with RSO2- in a known manner at the O atom or, depending on the p-substituents in II, can lead to the formation of p-O2NC6H4CH(OAc)SO2R (where R = Ph or p-MeC6H4) via valence tautomers of II. The experimental process involved the reaction of tert-Butyl 2-(4-nitrophenyl)acetate(cas: 29704-38-9).Category: esters-buliding-blocks

The Article related to acetoxy oxo sulfones rearrangement mechanism, oxo acetoxy sulfones rearrangement mechanism, sulfones acetoxy oxo rearrangement mechanism, rearrangement mechanism acetoxy oxo sulfones and other aspects.Category: esters-buliding-blocks

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

On September 1, 2017, Hoellerer, Christine; Mueller, Johannes; Goeen, Thomas; Eckert, Elisabeth published an article.Safety of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate The title of the article was Isomeric separation and quantitation of di-(2-ethylhexyl) trimellitates and mono-(2-ethylhexyl) trimellitates in blood by LC-MS/MS. And the article contained the following:

A new and fast HPLC-method for the simultaneous determination of tri-(2-ethylhexyl) trimellitate (TOTM or TEHTM), its diesters 2,4-di-(2-ethylhexyl) trimellitate (2,4-DEHTM), 1,4-di-(2-ethylhexyl) trimellitate (1,4-DEHTM), 1,2-di-(2-ethylhexyl) trimellitate (1,2-DEHTM) and monoesters 1-mono-(2-ethylhexyl) trimellitate (1-MEHTM), 2-mono-(2-ethylhexyl) trimellitate (2-MEHTM) and 4-mono-(2-ethylhexyl) trimellitate (4-MEHTM) together with di-(2-ethylhexyl) phthalate (DEHP) and its primary metabolite mono-(2-ethylhexyl) phthalate (MEHP) in blood was developed and validated. The analytes are extracted from blood using liquid-liquid extraction and are chromatog. separated by reversed-phase HPLC using core shell material. Quant. assessment was performed by ESI-tandem mass spectrometry in neg. ionization mode using stable isotope dilution In less than 30 min six postulated primary metabolites of TOTM along with the DEHP metabolite MEHP can be selectively and sensitively quantified. Addnl., the method enables the determination of the parent plasticizers TOTM and DEHP. The detection limits in blood were found to range between 0.7-5.5 μg/L for all TOTM analytes. Precision and repeatability of the method were proven by relative standard deviations between 0.9% and 8.7%. TOTM, an alternative plasticizer to DEHP, is already increasingly used for medical devices. Nevertheless, data about the human metabolism of TOTM are still limited. The presented method is the first one enabling the simultaneous determination of the parent plasticizers TOTM and DEHP together with their primary degradation products (DEHTM, MEHTM, MEHP) and can thus be applied manifold including the investigation of the human metabolism of TOTM. The experimental process involved the reaction of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate(cas: 3319-31-1).Safety of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate

The Article related to monoethylhexyl diethylhexyl trimellitate quantitation blood lc ms, biomonitoring, core shell material, di-(2-ethylhexyl) phthalate, human metabolites, tri-(2-ethylhexyl) trimellitate and other aspects.Safety of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate

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

On November 30, 1981, Fujisawa, Seiichiro; Masuhara, Eiichi published an article.Quality Control of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate) The title of the article was Determination of partition coefficients of acrylates, methacrylates, and vinyl monomers using high performance liquid chromatography (HPLC). And the article contained the following:

Retention times (Rt) for acrylates, methacrylates, and vinyl monomers were measured with 2 different columns (C18 Corasil and C8 LiChrosorb) using reverse-phase HPLC in order to obtain their partition coefficients between 1-octanol and water (log P). The log P values of test compounds were determined from the regression curves between Rt and log P values of a number of standards using C8 LiChrosorb. The log P values obtained in this manner agreed closely with the log P values observed in previous studies. However, the peaks of these compounds were not sharp and some compounds were eluted for > 10 min. Thus, the measurement of accurate Rt values is tedious. C18 Corasil was therefore used in a mobile phase (MeOH-H2O 85:15). The Rt of some methacrylates with P values over 4 were delayed due to the hydrophobic interaction between these compounds and the C18 packing material. However, in the measurable region of the log P values (about -1 to +4), log P correlated linearly with log Rt following 2 different regression curves: one for aliphatic and aromatic compounds with the functional groups (r = 0.92), and the other for compounds without these groups (r = 0.99). Log P values of methacrylates widely used in dentistry can be determined easily and accurately by HPLC. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Quality Control of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

The Article related to partition coefficient acrylate monomer, liquid chromatog acrylate monomer, methacrylate monomer liquid chromatog, vinyl monomer liquid chromatog, dental monomer partition coefficient and other aspects.Quality Control of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

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

On November 30, 2017, Radulovic, Niko S.; Miltojevic, Ana B.; Stojanovic, Nikola M.; Randjelovic, Pavle J. published an article.Name: Methyl N-Methylanthranilate The title of the article was Distinct urinary metabolite profiles of two pharmacologically active n-methylanthranilates: three approaches to xenobiotic metabolite identification. And the article contained the following:

Two volatile alkaloids, iso-Pr N-methylanthranilate (IMA) and Me N-methylanthranilate (MMA), present in the human diet and cosmetic products, were recently demonstrated to possess important pharmacol. activities. While MMA is considered to be phototoxic, there is scarce data on the toxicity of IMA. Herein, we analyzed urinary metabolites of IMA and MMA in rats (200 mg kg-1, i.p., 7 days) by combining three different approaches: 1) preparative chromatog., 2) synthesis, and 3) SPR. The preparative approach, Sephadex LH-20 chromatog. of the extract of urine samples of IMA treated animals, in conjunction with NMR, enabled the identification of 16 different anthranilate derivatives, among which products of aromatic core hydroxylation (iso-Pr 5-hydroxy-N-methylanthranilate, iso-Pr 5-hydroxyantranilate, iso-Pr 3-hydroxyantranilate) were the major ones. The first application of the synthetic/combinatorial approach led to a successful identification of MMA metabolites, where 2-(methylamino)benzamide and N-methylanthranilic acid were the principal ones, among 14 others. Generally, MMA and IMA undergo analogous biotransformation pathways; however, MMA predominantly underwent chem. conversions of the ester group, i.e. transformation into derivatives of anthranilamide and anthranilic acid, while the major metabolic pathway of IMA was hydroxylation of the aromatic core. Addnl., pathohistol. examinations revealed no signs of liver toxicity, or other signs of toxicity. The experimental process involved the reaction of Methyl N-Methylanthranilate(cas: 85-91-6).Name: Methyl N-Methylanthranilate

The Article related to urinary metabolite isopropyl methyl n methylanthranilate, isopropyl n-methylanthranilate, metabolite identification, methyl n-methylanthranilate, rat, urinary metabolites, xenobiotic and other aspects.Name: Methyl N-Methylanthranilate

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

On December 7, 2021, Chen, Peiran; Dai, Xueqi published an article.Reference of (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate The title of the article was Site-specific synthesis of 3-Se-1,2-unsaturated glycosides with R-Se-Se-R as the nucleophile precursors promoted by InCl3/Hf(OTf)4. And the article contained the following:

By using Hf(OTf)4 as the catalyst, a series of 3-Se 1,2-unsaturated glucosides, e.g. I, have been synthesized site-specifically from tri-O-acetyl-D-glucal, 3,4-di-O-acetyl-L-rhamnal or 2,4,6-tri-O-benzyl-D-glucal with alkyl(aryl) hydroselenides as the nucleophile precursors in good yield. The experimental process involved the reaction of (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate(cas: 2873-29-2).Reference of (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate

The Article related to substitution catalyst selenoglycoside preparation hafnium triflate indium chloride catalyst, selenoglycoside preparation hafnium triflate indium chloride catalyst selenylation glycal and other aspects.Reference of (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate

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

Romero, Eugenie; Minard, Corinne; Benchekroun, Mohamed; Ventre, Sandrine; Retailleau, Pascal; Dodd, Robert H.; Cariou, Kevin published an article in 2017, the title of the article was Base-Mediated Generation of Ketenimines from Ynamides: Direct Access to Azetidinimines by an Imino-Staudinger Synthesis.Formula: C12H14F3NO2 And the article contains the following content:

Ynamides were used as precursors for the in situ generation of highly reactive ketenimines that could be trapped with imines in a [2+2] cycloaddition This imino-Staudinger synthesis led to a variety of imino-analogs of β-lactams, namely azetidinimines I [Ar1 = Ph, 4-MeOC6H4, 4-ClC6H4, 4-BrC6H4, 4-IC6H4, 4-F3CC6H4; Ar2 = Ph, 4-MeOC6H4, 4-ClC6H4, 4-BrC6H4, 4-IC6H4, 4-MeO2CC6H4, 4-t-Bu-O2CC6H4; Ar3 = Ph, 4-MeOC6H4] that could be further functionalized through a broad range of transformations. The experimental process involved the reaction of tert-Butyl (4-(trifluoromethyl)phenyl)carbamate(cas: 141940-37-6).Formula: C12H14F3NO2

The Article related to azetidinimine preparation, ketenimine insitu generation ynamide imine imino staudinger cycloaddition, staudinger synthesis, [2+2] cycloaddition, azetidinimines, ketenimines, ynamides and other aspects.Formula: C12H14F3NO2

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