Month: October 2022

Ghahremani, Milad; Ghasemzadeh, Kamran; Jalilnejad, Elham; Iulianelli, Adolfo published the artcile< A Theoretical Analysis on a Multi-Bed Pervaporation Membrane Reactor during Levulinic Acid Esterification Using the Computational Fluid Dynamic Method>, Product Details of C19H34O2, the main research area is multi bed pervaporation membrane reactor levulinic acid esterification; computational fluid dynamic method; computational fluid dynamic (CFD) method; esterification process; modeling and simulation; pervaporation membrane reactor.

Pervaporation is a peculiar membrane separation process, which is considered for integration with a variety of reactions in promising new applications. Pervaporation membrane reactors have some specific uses in sustainable chem., such as the esterification processes. This theor. study based on the computational fluid dynamics method aims to evaluate the performance of a multi-bed pervaporation membrane reactor (including poly (vinyl alc.) membrane) to produce Et levulinate as a significant fuel additive, coming from the esterification of levulinic acid. For comparison, an equivalent multi-bed traditional reactor is also studied at the same operating conditions of the aforementioned pervaporation membrane reactor. A computational fluid dynamics model was developed and validated by exptl. literature data. The effects of reaction temperature, catalyst loading, feed molar ratio, and feed flow rate on the reactor’s performance in terms of levulinic acid conversion and water removal were hence studied. The simulations indicated that the multi-bed pervaporation membrane reactor results to be the best solution over the multi-bed traditional reactor, presenting the best simulation results at 343 K, 2 bar, catalyst loading 8.6 g, feed flow rate 7 mm3/s, and feed molar ratio 3 with levulinic acid conversion equal to 95.3% and 91.1% water removal.

Membranes (Basel, Switzerland) published new progress about Catalysts. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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

Jiang, Yuan; Liu, Xiao-Chen; Ahrne, Lilia M.; Skibsted, Leif H. published the artcile< Enthalpy-entropy compensation in calcium binding to acid-base forms of glycine tyrosine dipeptides from hydrolysis of α-lactalbumin>, Synthetic Route of 112-63-0, the main research area is alpha lactalbumin hydrolysis calcium binding glycine tyrosine dipeptide; Calcium binding; Calcium bioavailability; Density Functional Theory; Dipeptide; Enthalpy–entropy compensation.

Calcium binding to peptides formed by hydrolysis of whey proteins during digestion is important for calcium uptake in the intestines and affects the antioxidant function of the peptides. For the two dipeptides, Gly-Tyr and Tyr-Gly, potential hydrolysis products of α-lactalbumin, calcium binding to the three forms of each dipeptide in acid-base equilibrium at intestinal pH was determined electrochem. and compared to binding to tyrosine for aqueous 0.16 M NaCl for 5 < pH < 9 at 15°C, 25°C, and 37°C. At milk pH at 25°C, binding of calcium to the zwitterion of GlyTyr dominates, with an association constant Kass2 = 22 M-1 with ΔH0 = -46 kJ·mol-1, while binding to the mononeg. TyrGly dominates for TyrGly with Kass3 = 32 M-1 and ΔH0 = -38 kJ·mol-1. At intestinal conditions, pH = 7 and 37°C, binding of calcium has similar affinity for GlyTyr and TyrGly, while at higher pH and lower temperature, GlyTyr binds stronger. D. Functional Theory calculations confirmed a stronger binding to the zwitterion of GlyTyr than of TyrGly and an increasing affinity with increasing pH for both. Calcium binding to the acid/base forms of the dipeptides is at neutral pH strongly exothermic with ΔH0 becoming less neg. at higher pH, and a linear enthalpy-entropy compensation (r2 = 0.99) results in comparable binding important for calcium bioavailability along the changing distribution among acid-base forms. Calcium binding decreases radical scavenging rate and antioxidative activity of both dipeptides. Food Research International published new progress about Amino acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Synthetic Route of 112-63-0.

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

Vinogradov, Serguei V.; Batrakova, Elena V.; Kabanov, Alexander V. published the artcile< Nanogels for oligonucleotide delivery to the brain>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is nanogel oligonucleotide delivery brain.

Systemic delivery of oligonucleotides (ODN) to the central nervous system is needed for development of therapeutic and diagnostic modalities for treatment of neurodegenerative disorders. Macromols. injected in blood are poorly transported across the blood-brain barrier (BBB) and rapidly cleared from circulation. In this work we propose a novel system for ODN delivery to the brain based on nanoscale network of cross-linked poly(ethylene glycol) and polyethylenimine (“”nanogel””). The methods of synthesis of nanogel and its modification with specific targeting mols. are described. Nanogels can bind and encapsulate spontaneously neg. charged ODN, resulting in formation of stable aqueous dispersion of polyelectrolyte complex with particle sizes less than 100 nm. Using polarized monolayers of bovine brain microvessel endothelial cells as an in vitro model this study demonstrates that ODN incorporated in nanogel formulations can be effectively transported across the BBB. The transport efficacy is further increased when the surface of the nanogel is modified with transferrin or insulin. Importantly the ODN is transported across the brain microvessel cells through the transcellular pathway; after transport, ODN remains mostly incorporated in the nanogel and ODN displays little degradation compared to the free ODN. Using mouse model for biodistribution studies in vivo, this work demonstrated that as a result of incorporation into nanogel 1 h after i.v. injection the accumulation of a phosphorothioate ODN in the brain increases by over 15 fold while in liver and spleen decreases by 2-fold compared to the free ODN. Overall, this study suggests that nanogel is a promising system for delivery of ODN to the brain.

Bioconjugate Chemistry published new progress about Blood-brain barrier. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Piffeteau, Annie; Gaudry, Michel published the artcile< Biotin uptake: influx, efflux and countertransport in Escherichia coli K12>, Related Products of 112-63-0, the main research area is biotin transport Escherichia.

Biotin uptake by E. coli K12 has been reinvestigated. The vitamin uptake is an active process depending on energy and inhibited by uncouplers. The kinetic parameters (Km = 0.27 μM, Vmax = 6.8 pmol/min/mg dry cells) are close to those previously determined for a biotin-dependent strain E. coli C162 (Piffeteau, A., et. al, 1982). By use of biotin p-nitrophenyl ester, an affinity label of the biotin transport system, it was shown, under conditions of steady state, that the efflux of biotin is not energy dependent and is mainly mediated by a diffusion mechanism. Reexamination of the regulation of the biotin transport by biotin, revealed that only 50% of the biotin uptake system is under control by the vitamin.

Biochimica et Biophysica Acta, Biomembranes published new progress about Biological transport. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

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

Yudasaka, Masaharu; Maruyama, Toshifumi; Yamaguchi, Eiji; Tada, Norihiro; Itoh, Akichika published the artcile< Synthesis, Characterization, and Reaction of a Both Inter- and Intramolecularly Coordinated Pseudocyclic Iodosylbenzene-Trifluoroacetic Acid Complexes>, HPLC of Formula: 112-63-0, the main research area is iodobenzene oxidation; iodosylbenzene trifluoroacetic acid comples preparation oxidant.

An ortho-substituted ether-oxygen-coordinated pseudocyclic iodosylbenzene-trifluoroacetic acid (pcISB-TFA) complex was synthesized and characterized by X-ray crystallog. anal. TFA suppresses the disproportionation by both coordination of the oxygen atom to the iodine(III) center through secondary bonding and by hydrogen bonding to the oxygen anion. This bench-stable reagent is highly soluble in common organic solvents and reacts with various organic substrates under mild reaction conditions to give the corresponding products in good yields.

European Journal of Organic Chemistry published new progress about Crystal structure. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, HPLC of Formula: 112-63-0.

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

Li, Meng-Die; Fu, Lin; Lv, Bian-Bian; Xiang, Ying; Xiang, Hui-Xian; Xu, De-Xiang; Zhao, Hui published the artcile< Arsenic induces ferroptosis and acute lung injury through mtROS-mediated mitochondria-associated endoplasmic reticulum membrane dysfunction>, Safety of Ethyl 3-amino-4-(cyclohexylamino)benzoate, the main research area is arsenic ferroptosis acute lung injury mtROS ER membrane dysfunction; Acute lung injury; Arsenic; Ferroptosis; Mitofusin-2; MtROS; PERK.

The goal of this study was to analyze whether mitochondria-associated endoplasmic reticulum membrane (MAMs) dysfunction mediated arsenic (As)-evoked pulmonary ferroptosis and acute lung injury (ALI). As exposure led to alveolar structure damage, inflammatory cell infiltration and pulmonary function decline in mice. Ferritin, the marker of iron overload, was increased, GPX4, the index of lipid peroxidation, was decreased in As-exposed lungs and pulmonary epithelial cells (MLE-12). Pretreatment with ferrostatin-1 (Fer-1), the inhibitor of ferroptosis, alleviated As-evoked ALI. In addition, As-induced non-heme iron deposition was inhibited in Fer-1 pretreated-mice. Moreover, As-triggered mitochondria damage and ferroptosis were mitigated in Fer-1 pretreated-MLE-12 cells. Mechanistically, PERK phosphorylation and mitofusin-2 (Mfn-2) reduction was observed in As-exposed MLE-12 cells and mice lungs. Addnl., the interaction between PERK and Mfn-2 was downregulated and MAMs dysfunction was observed in As-exposed MLE-12 cells. Intriguingly, PERK inhibitor and Mfn-2-overexpression all mitigated As-induced ferroptosis in MLE-12 cells. Addnl., CLPP and mtHSP70, the markers of mitochondrial stress, were upregulated, mitochondrial ROS (mtROS) was elevated, mitochondrial membrane potential (MMP) and ATP were decreased in As-exposed MLE-12 cells. Mitoquinone mesylate (MitoQ), a novel mitochondrial-targeted antioxidant, alleviated As-induced excess mtROS, mitochondrial stress, MAMs dysfunction in pulmonary epithelial cells. Similarly, in vivo experiments indicated that MitoQ pretreatment countered As-induced pulmonary ferroptosis and ALI. These data indicated that mtROS-initiated MAMs dysfunction is, at least partially, implicated in As-evoked ferroptosis and ALI.

Ecotoxicology and Environmental Safety published new progress about Acute pulmonary injury. 347174-05-4 belongs to class esters-buliding-blocks, and the molecular formula is C15H22N2O2, Safety of Ethyl 3-amino-4-(cyclohexylamino)benzoate.

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

Nawghare, Beena R.; Lokhande, Pradeep D. published the artcile< First iodine-catalyzed deallylation of reactive allyl methylene esters>, HPLC of Formula: 30095-98-8, the main research area is allyl methylene ester iodine catalyzed deallylation lactonization.

A C-allyl cleavage was developed using inexpensive and mild I2 in DMSO. A variety of compounds with active methylene groups were C-deallylated using this reagent. This method is efficient and operationally simple in comparison to the methods using transition-metal complexes.

Synthetic Communications published new progress about Active methylene compounds Role: RCT (Reactant), RACT (Reactant or Reagent). 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, HPLC of Formula: 30095-98-8.

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

Uvyn, Annemiek; De Coen, Ruben; De Wever, Olivier; Deswarte, Kim; Lambrecht, Bart N.; De Geest, Bruno G. published the artcile< Cell surface clicking of antibody-recruiting polymers to metabolically azide-labeled cancer cells>, Name: Perfluorophenyl acrylate, the main research area is antibody recruiting polymer tumor binding innate immunity.

Triggering antibody-mediated innate immune mechanisms to kill cancer cells is an attractive therapeutic avenue. In this context, recruitment of endogenous antibodies to the cancer cell surface could be a viable alternative to the use of monoclonal antibodies. We report on antibody-recruiting polymers containing multiple antibody-binding hapten motifs and cyclooctynes that can covalently conjugate to azides introduced onto the glycocalyx of cancer cells by metabolic labeling with azido sugars.

Chemical Communications (Cambridge, United Kingdom) published new progress about Animal tissue culture (2D, 3D). 71195-85-2 belongs to class esters-buliding-blocks, and the molecular formula is C9H3F5O2, Name: Perfluorophenyl acrylate.

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

Aponick, Aaron; Li, Chuan-Ying; Palmes, Jean A. published the artcile< Au-Catalyzed cyclization of monopropargylic triols: an expedient synthesis of monounsaturated spiroketals>, Computed Properties of 617-55-0, the main research area is spiroketal derivative preparation; monopropargylic triol preparation cyclization gold; gold cyclization catalyst.

The gold-catalyzed cyclization of monopropargylic triols to form olefin-containing spiroketals is reported. The reactions are rapid and high yielding when 2 mol % of the catalyst generated in situ from Au[P(t-Bu)2(o-biphenyl)]Cl and AgOTf is employed in THF at 0 °C. A range of differentially substituted triols leading to substituted 5- and 6-membered ring spiroketals were prepared and function well in the reaction.

Organic Letters published new progress about Cyclization. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Computed Properties of 617-55-0.

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

Tran, Chinh Hoang; Lee, Min Woong; Kim, Sun A.; Jang, Han Byul; Kim, Il published the artcile< Kinetic and Mechanistic Study of Heterogeneous Double Metal Cyanide-Catalyzed Ring-Opening Multibranching Polymerization of Glycidol>, Application of C19H34O2, the main research area is kinetics mechanistic metal cyanide catalyzed multibranching polymerization glycidol.

Polyglycidols of tunable degree of branching (DB) have been synthesized via ring-opening multibranching polymerization (ROMBP) of glycidol in the absence of any initiators using heterogeneous double metal cyanide (DMC) catalysts. Semi-branched polyglycidols of low DB (less than 0.3) are obtained using simple solvent-free batch polymerizations, whereas hyperbranched analogs of high DB (more than 0.5) are achieved employing semi-batch (or slow monomer addition) polymerizations The rate of DMC-catalyzed ROMBPs of glycidol shows the first-order dependences on monomer and catalyst concentrations, suggesting that the ROMBPs proceed via a coordinative mechanism. The formation of propagating species and the resultant microstructural units are clarified using a conversion vs. time anal. in the NMR-scale.

Macromolecules (Washington, DC, United States) published new progress about Branched polymers, hyperbranched dendritic polymers Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Application of C19H34O2.

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