Month: November 2022

On May 31, 2010, Perez-Garrido, Alfonso; Helguera, Aliuska Morales; Rodriguez, Francisco Giron; Cordeiro, M. Natalia D. S. published an article.Electric Literature of 1985-51-9 The title of the article was QSAR models to predict mutagenicity of acrylates, methacrylates and α, β-unsaturated carbonyl compounds. And the article contained the following:

The purpose of this study is to develop a quant. structure-activity relationship (QSAR) model that can distinguish mutagenic from nonmutagenic species with α,β-unsaturated carbonyl moiety using two endpoints for this activity, i.e. Ames test and mammalian cell gene mutation test, and also to gather information about the mol. features that most contribute to eliminate the mutagenic effects of these chems. Two data sets were used for modeling the two mutagenicity endpoints: (1) Ames test and (2) mammalian cells mutagenesis. The former comprised 220 mols., while the latter comprised 48 substances, ranging from acrylates and methacrylates to α,β-unsaturated carbonyl compounds The QSAR models were developed by applying linear discriminant anal. (LDA) along with different sets of descriptors computed using the DRAGON software. For both endpoints, there was a concordance of 89% in the prediction and 97% confidentiality by combining the three models for the Ames test mutagenicity. We have also identified several structural alerts to assist the design of new monomers. These individual models and especially their combination are attractive from the point of view of mol. modeling and could be used for the prediction and design of new monomers that do not pose a human health risk. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Electric Literature of 1985-51-9

The Article related to qsar model mutagenicity acrylate methacrylate unsaturated carbonyl compound, Toxicology: Carcinogens, Mutagens, and Teratogens and other aspects.Electric Literature of 1985-51-9

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

On April 5, 2011, Mealman, Tiffany D.; Bagai, Ireena; Singh, Pragya; Goodlett, David R.; Rensing, Christopher; Zhou, Hongjun; Wysocki, Vicki H.; McEvoy, Megan M. published an article.Reference of Bis(2,5-dioxopyrrolidin-1-yl) glutarate The title of the article was Interactions between CusF and CusB Identified by NMR Spectroscopy and Chemical Cross-Linking Coupled to Mass Spectrometry. And the article contained the following:

The Escherichia coli periplasmic proteins CusF and CusB, as part of the CusCFBA efflux system, aid in the resistance of elevated levels of copper and silver by direct metal transfer between the metallochaperone CusF and the membrane fusion protein CusB before metal extrusion from the periplasm to the extracellular space. Although previous in vitro experiments have demonstrated highly specific interactions between CusF and CusB that are crucial for metal transfer to occur, the structural details of the interaction have not been determined Here, the interactions between CusF and CusB are mapped through NMR spectroscopy and chem. crosslinking coupled with high-resolution mass spectrometry to better understand how recognition and metal transfer occur between these proteins. The NMR 1H-15N correlation spectra reveal that CusB interacts with the metal-binding face of CusF. In vitro chem. crosslinking with a 7.7 Å homobifunctional amine-reactive cross-linker, BS2G, was used to capture the CusF/CusB interaction site, and mass spectral data acquired on an LTQ-Orbitrap confirm the following two cross-links: CusF K31 to CusB K29 and CusF K58 to CusB K32, thus revealing that the N-terminal region of CusB interacts with the metal-binding face of CusF. The proteins transiently interact in a metal-dependent fashion, and contacts between CusF and CusB are localized to regions near their resp. metal-binding sites. The experimental process involved the reaction of Bis(2,5-dioxopyrrolidin-1-yl) glutarate(cas: 79642-50-5).Reference of Bis(2,5-dioxopyrrolidin-1-yl) glutarate

The Article related to interaction cusf cusb nmr spectroscopy crosslinking coupled mass spectrometry, Biochemical Methods: Spectral and Related Methods and other aspects.Reference of Bis(2,5-dioxopyrrolidin-1-yl) glutarate

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

Amin, Hassan B.; Taylor, Roger published an article in 1978, the title of the article was The mechanism of the gas-phase pyrolysis of esters. Part 6. Pyrolysis of 1-arylethyl benzoates and tert-butyl phenylacetates.HPLC of Formula: 29704-38-9 And the article contains the following content:

Rate coefficients for pyrolysis of RC6H4CH(OAc)Me (R = H, p-, m-Me, -Cl, -NO2, p-CF3) were determined at 617.9-68.4 K and the log krelative values give an excellent correlation with σ+ values with ρ -0.72 at 600 K; this confirms that the polarity of the transition state for benzoate pyrolysis is greater than that for acetates and less than for carbonates. Rate coefficients for pyrolysis of RC6H4CH2CO2CMe3 (R = p-OMe, -Me, -F, -Cl, -NO2, m-Me, -Cl, H), determined at 543.3-600.8 K, give log krelative values which correlate with σ0 values with ρ 0.39 at 600 K, confirming that the polarity of the transition state for phenylacetate pyrolysis is less than that for benzoates and N-phenylcarbamates. The phenylacetate data correlate better with σn values, confirming that these are more accurate resonance-free substituent constants than are σ0 values. The experimental process involved the reaction of tert-Butyl 2-(4-nitrophenyl)acetate(cas: 29704-38-9).HPLC of Formula: 29704-38-9

The Article related to kinetics pyrolysis phenylethyl benzoate, butyl phenylacetate pyrolysis kinetics, Physical Organic Chemistry: Degradation Reactions and other aspects.HPLC of Formula: 29704-38-9

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

Natrajan, Anand; Wen, David published an article in 2015, the title of the article was A comparison of chemiluminescent acridinium dimethylphenyl ester labels with different conjugation sites.Reference of Bis(2,5-dioxopyrrolidin-1-yl) glutarate And the article contains the following content:

Chemiluminescent acridinium dimethylphenyl esters are highly sensitive labels that were used in automated assays for clin. diagnosis. Light emission from these labels and their conjugates is triggered by treatment with alk. peroxide. Conjugation of acridinium ester labels is normally done at the phenol. During the chemiluminescent reaction of these acridinium esters, the phenolic ester is cleaved and the light emitting acridone moiety is liberated from its conjugate partner. In the current study, the authors report the synthesis of three new acridinium esters with conjugation sites at the acridinium nitrogen and compare their properties with that of a conventional acridinium ester with a conjugation site at the phenol. The authors’ study is the first that provides a direct comparison of the emissive properties of acridinium dimethylphenyl esters (free labels and protein conjugates) with different conjugation sites, one where the light emitting acridone remains attached to its conjugate partner vs. conventional labeling which results in cleavage of the acridone from the conjugate. The authors’ results indicate that the conjugation at the acridinium nitrogen, which also alters how the acridinium ring and phenol are oriented with respect to the protein surface, has a minimal impact on emission kinetics and emission spectra. However, this mode of conjugation to three different proteins led to a significant increase in light yield which should be useful for improving the assay sensitivity. The experimental process involved the reaction of Bis(2,5-dioxopyrrolidin-1-yl) glutarate(cas: 79642-50-5).Reference of Bis(2,5-dioxopyrrolidin-1-yl) glutarate

The Article related to chemiluminescent acridinium dimethylphenyl ester label conjugation site protein, Biochemical Methods: Spectral and Related Methods and other aspects.Reference of Bis(2,5-dioxopyrrolidin-1-yl) glutarate

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

On June 21, 2020, Raj, Danuta published an article.Formula: C13H10O3 The title of the article was Thin-layer chromatography with eutectic mobile phases-preliminary results. And the article contained the following:

The presented paper is the first to show thin layer chromatog. (TLC) anal. based on eutectic mobile phases (Deep Eutectic Solvents – DES). During the experiment 25 eutectic mixtures were investigated for their chromatog. properties. Most of them belong to the natural deep eutectic solvents (NADES) group. Also, new eutectic liquids based on phenolics and terpenes, not previously employed in anal. practice, were tested. The eutectic liquids were investigated as pure or diluted with solvents used in chromatog. routine: methanol, water, acetone, chloroform or di-Et ether. The analyses were carried out using classic and high performance silica gel plates. The working solution was a mixture of five alkaloids found in genus Chelidonium, namely sanguinarine, coptisine, chelerythrine, chelidonine, and berberine, with UV light detection of 366 nm. This report proves that eutectic TLC is possible and that the eutectic interactions play a crucial role in the separation process. In most of the tested modifications at least partial separation was achieved. The most successful mobile phase, which enabled separation of all the tested alkaloids, was the equimolar mixture of menthol and phenol with a 35% addition of methanol. The system was also effective in separating alkaloids in the real Chelidonium maius extract sample. The experimental process involved the reaction of Phenyl Salicylate(cas: 118-55-8).Formula: C13H10O3

The Article related to thin layer chromatog eutectic mobile phase, chelidonium, chromatography, eutectic solvents, isoquinoline alkaloids, nades, tlc, Biochemical Methods: Spectral and Related Methods and other aspects.Formula: C13H10O3

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

On January 16, 2022, Dussoyer, Melissa; Page, Adeline; Delolme, Frederic; Rousselle, Patricia; Nystrom, Alexander; Moali, Catherine published an article.COA of Formula: C12H18O5 The title of the article was Comparison of extracellular matrix enrichment protocols for the improved characterization of the skin matrisome by mass spectrometry. And the article contained the following:

A striking feature of skin organization is that the extracellular matrix (ECM) occupies a larger volume than the cells. Skin ECM also directly contributes to aging and most cutaneous diseases. In recent years, specific ECM enrichment protocols combined with in silico approaches allowed the proteomic description of the matrisome of various organs and tumor samples. Nevertheless, the skin matrisome remains under-studied and protocols allowing the efficient recovery of the diverse ECM found in skin are still to be described. Here, we compared four protocols allowing the enrichment of ECM proteins from adult mouse back skin and found that all protocols led to a significant enrichment (up to 65%) of matrisome proteins when compared to total skin lysates. The protocols based on decellularization and solubility profiling gave the best results in terms of numbers of proteins identified and confirmed that skin matrisome proteins exhibit very diverse solubility and abundance profiles. We also report the first description of the skin matrisome of healthy adult mice that includes 236 proteins comprising 95 core matrisome proteins and 141 associated matrisome proteins. These results provide a reliable basis for future characterizations of skin ECM proteins and their dysregulations in disease-specific contexts. Extracellular matrix proteins are key players in skin physiopathol. and have been involved in several diseases such as genetic disorders, wound healing defects, scleroderma and skin carcinoma. However, skin ECM proteins are numerous, diverse and challenging to analyze by mass spectrometry due to the multiplicity of their post-translational modifications and to the heterogeneity of their solubility profiles. Here, we performed the thorough evaluation of four ECM enrichment protocols compatible with the proteomic anal. of mouse back skin and provide the first description of the adult mouse skin matrisome in homeostasis conditions. Our work will greatly facilitate the future characterization of skin ECM alterations in preclin. mouse models and will inspire new optimizations to analyze the skin matrisome of other species and of human clin. samples. The experimental process involved the reaction of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)(cas: 2358-84-1).COA of Formula: C12H18O5

The Article related to skin matrisome extracellular matrix mass spectrometry, decellularization, extracellular matrix, matrisome, mouse, proteomics, skin, Biochemical Methods: Spectral and Related Methods and other aspects.COA of Formula: C12H18O5

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

Coelho, Eduardo; Lemos, Margarida; Genisheva, Zlatina; Domingues, Lucilia; Vilanova, Mar; Oliveira, Jose M. published an article in 2020, the title of the article was Validation of a LLME/GC-MS methodology for quantification of volatile compounds in fermented beverages.Name: Diethyl succinate And the article contains the following content:

Knowledge of composition of beverages volatile fraction is essential for understanding their sensory attributes. Anal. of volatile compounds predominantly resorts to gas chromatog. coupled with mass spectrometry (GC-MS). Often a previous concentration step is required to quantify compounds found at low concentrations This work presents a liquid-liquid microextraction method combined with GC-MS (LLME/GC-MS) for the anal. of compounds in fermented beverages and spirits. The method was validated for a set of compounds typically found in fermented beverages comprising alcs., esters, volatile phenols, and monoterpenic alcs. The key requiremsents for validity were observed, namely linearity, sensitivity in the studied range, accuracy, and precision within the required parameters. Robustness of the method was also evaluated with satisfactory results. Thus, the proposed LLME/GC-MS method may be a useful tool for the anal. of several fermented beverages, which is easily implementable in a laboratory equipped with a GC-MS. The experimental process involved the reaction of Diethyl succinate(cas: 123-25-1).Name: Diethyl succinate

The Article related to fermented beverage volatile compound llme gcms, gc-ms, analytical method, fermented beverages, liquid-liquid microextraction, volatile compounds, Biochemical Methods: Spectral and Related Methods and other aspects.Name: Diethyl succinate

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

On December 31, 2017, Renaut, Steven D.; Whiteley, Michele published an article.Name: Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate The title of the article was A study to support regulatory submission assessing effects of Tri(2-ethylhexyl) trimellitate (TEHTM) upon pre and post-natal development in the rat, with a comparative group receiving Di(2-ethyl hexyl) phthalate (DEHP) included. And the article contained the following:

Oral exposure of rodents to the plasticizer, Di(2-Et hexyl) phthalate (DEHP), elicits birth defects and effects upon the reproductive tract. There is currently limited published information regarding potential developmental effects in rodents of another phthalate ester, TEHTM. The experimental process involved the reaction of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate(cas: 3319-31-1).Name: Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate

The Article related to dehp tehtm reproductive tract, male reproductive tract toxicity, phthalate, regulatory toxicology, reproductive toxicity, reproductive toxicology, Toxicology: Carcinogens, Mutagens, and Teratogens and other aspects.Name: Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate

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

On February 28, 2017, Genay, Stephanie; Feutry, Frederic; Masse, Morgane; Barthelemy, Christine; Sautou, Valerie; Odou, Pascal; Decaudin, Bertrand; Azaroual, Nathalie; Armed Study Group published an article.Electric Literature of 3319-31-1 The title of the article was Identification and quantification by 1H nuclear magnetic resonance spectroscopy of seven plasticizers in PVC medical devices. And the article contained the following:

Medical devices are generally made of polyvinyl chloride plasticized by six authorized plasticizers as alternatives to di-(2-ethylhexyl)-phthalate (DEHP) classified as reprotoxic class 1b. These are acetyl tri-Bu citrate (ATBC), di-(2-ethylhexy) adipate (DEHA), di-(2-ethylhexyl) terephthalate (DEHT), di-isononyl cyclohexane-1,2-dicarboxylate (DINCH), di-isononyl phthalate (DINP), and tri-octyl trimellitate (TOTM). The main objective of this study was to propose a new method using 1H NMR spectroscopy to determine and quantify these seven plasticizers in PVC sheets, standard infusion tubings, and com. available medical devices. Two techniques were compared: dissolution in deuterated THF and extraction by deuterated chloroform. Plasticizer 1H NMR spectra were very similar in both deuterated solvents; dissolution and extraction provided similar results. The sensitivity of this method enabled us to detect and quantify the presence of minor plasticizers in PVC. In nine com. available samples, the major plasticizer was identified and quantified by 1H NMR. In six samples, one, two, or three minor plasticizers were identified and also quantified. DEHP was detected in only one tubing. NMR is therefore very convenient for studying plasticizers contained in medical devices. Only small quantities of solvents and sample are required. It is not necessary to dilute samples to enter a quantification range, and it is sufficiently sensitive to detect contaminants. The experimental process involved the reaction of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate(cas: 3319-31-1).Electric Literature of 3319-31-1

The Article related to quantification nmr spectroscopy plasticizer pvc medical device, biomaterials, medical devices, nuclear magnetic resonance, plasticizers, polymers, polyvinyl chloride, Biochemical Methods: Spectral and Related Methods and other aspects.Electric Literature of 3319-31-1

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

On February 8, 2018, Avelino, Helena; Caetano, Fernando J. P.; Diogo, Joao C. F.; Fareleira, Joao M. N. A.; Pereira, Marta F. V.; Santos, Fernando J. V.; Santos, Tania V. M.; Wakeham, William A. published an article.Product Details of 3319-31-1 The title of the article was Density and Rheology of Tris(2-ethylhexyl) Trimellitate (TOTM). And the article contained the following:

This article presents new d. data and some rheol. studies on tris(2-ethylhexyl) trimellitate (TOTM) which has recently been proposed as a reference fluid for viscosity at high temperatures and high pressures. The d. data were obtained with the aid of an Anton Paar DMA HP U-tube instrument, covering temperatures from (328 to 423) K and pressures up to 70 MPa, and they are aimed at extending the temperature range of previous results. They are also used to check the effect of inter-lot consistency of the d. data for TOTM. The present d. measurements are compared with previously published data. Rheol. tests were carried out to complement earlier studies. Particular attention is given to the shear rate range of greatest interest for the proposed use of TOTM as an industrial reference fluid for viscosity: the tests include shear stresses up to 750 Pa and shear rates up to 4000 s-1 under atm. pressure. The tests were carried out using a Parallel Plate Rheometer AR1500ex10C4298. The results at 298 K corroborate the previous findings that TOTM is Newtonian below a shear rate of 600 s-1, which is entirely compatible with its use as an industrial calibrating fluid for viscosity. At shear rates higher than 600 s-1 a shear-thinning like behavior is observed 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 density rheol totm, General Physical Chemistry: Macroscopic Properties and other aspects.Product Details of 3319-31-1

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