Esters-buliding-blocks

Guo, Haixin published the artcileHydrogen gas-free processes for single-step preparation of transition-metal bifunctional catalysts and one-pot γ-valerolactone synthesis in supercritical CO2-ionic liquid systems, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is carbon transition metal bifunctional catalyst valerolactone one pot synthesis.

Hydrothermal carbonization of glucose (180 °C, 4 h) with 5-sulfosalicylic acid and nickel or copper sulfate afforded transition-metal (Ni/NiO, Cu/CuO) functional carbon (FC) catalysts in a single-step without hydrogen gas. Hydrogenation of levulinic acid to γ-valerolactone (GVL) in supercritical carbon dioxide (scCO2)-ionic liquid ([BMIM]Cl) systems with formic acid as H-donor source and Ni/NiO-FC catalysts gave 97% GVL yields (170 °C, 3 h). The Ni/NiO-FC catalysts (d = 50 to 200 nm) had well-dispersed Ni/NiO particles (<5 nm) with -SO3H, COOH and phenolic -OH functional groups; Ni/NiO-FC catalysts were more effective than Cu/CuO-FC catalysts. Ni/NiO-FC catalysts were active for conversion of substrates (Et levulinate, fructose, cellobiose or cellulose) to resp. products (GVL, 5-HMF, sugars). The role of scCO2 in the reaction system is one of improving mass transport and suppressing side-reactions via GVL product removal. Proposed methods for catalyst synthesis and substrate hydrogenation do not require hydrogen gas and are widely applicable to processing biomass. Journal of Supercritical Fluids published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Recommanded Product: Ethyl 4-oxopentanoate.

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

Naeem, Abdul published the artcileBiodiesel production from waste cooking oil employing natural bentonite supported heterogeneous catalyst: Waste to biodiesel, HPLC of Formula: 929-77-1, the main research area is bentonite biodiesel waste cooking oil heterogeneous catalyst.

This work describes the practicability of utilizing bentonite clay as a cheap and raw support for heterogeneous catalyst development. In the current research, ammonium persulfate (APS) impregnated bentonite heterogeneous catalyst was designed for the conversion of waste cooking oil to biodiesel. The fabricated catalyst was analyzed by various instrumental techniques (FTIR, TGA, BET, SEM, XRD, and EDX) to study its various physiochem. properties. It was identified that the clay supported heterogeneous catalyst executed an excellent activity for waste cooking oil conversion as providing maximum biodiesel yield of 93% at optimal reaction conditions (reaction temperature 75°C, oil/methanol molar ratio, 1:10; catalyst amount, 2.5 wt%; stirring rate, 600-rpm in 3.5 h reaction time). Gas chromatog. mass spectroscopy (GCMS) anal. confirms the successful conversion to biodiesel. Similarly, the various physiochem. characteristics of the synthesized biodiesel meet the international standard of American (ASTM6751) and European Union (EU-14214). Moreover, the designed acid catalyst showed catalytic activity for up to eight consecutive runs demonstrate its good reusability.

Korean Journal of Chemical Engineering published new progress about Adsorption. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, HPLC of Formula: 929-77-1.

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

Santana-Viera, Sergio published the artcileUV filters and UV stabilisers adsorbed in microplastic debris from beach sand, Computed Properties of 71617-10-2, the main research area is UV filter stabilizer microplastic beach sand adsorption pollution vector; Adsorption; Beach sand; Microplastics; Pollution vector; UV filters and stabilisers.

Microplastics (MPs) in oceans adsorb different types of pollutants, which can neg. impact the food chain. The extensive use of personal care products (PCPs) has led to their ubiquitous environmental presence, and their partition between plastic matrixes and surroundings is determined by their physico-chem. characteristics and environmental conditions. This work develops and applies a methodol. to determine 12 UV filters (UVFs) and UV stabilizers (UVSs) in MPs collected in beach sand. The analyzes were carried out by ultrasound-assisted extraction and ultrahigh-performance liquid chromatog. with tandem mass spectrometry detection. The validated procedure was applied to MPs samples taken in sand samples from 13 beaches on the Canary Islands (Spain). The results showed the presence of 10 UV filters and UV stabilizers at concentrations between 1 and 4031 ng·g-1, where octocrylene was the most frequently found. The target analytes were present in all the sampling beaches.

Marine Pollution Bulletin published new progress about Adsorption. 71617-10-2 belongs to class esters-buliding-blocks, name is Isopentyl 3-(4-methoxyphenyl)acrylate, and the molecular formula is C15H20O3, Computed Properties of 71617-10-2.

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

Goda, Mohamed Nady published the artcileMineral acid-activated sugarcane bagasse ash as solid acid catalyst for the liquid phase esterification of acetic acid with n-amyl, benzyl, and n-butyl alcohols, Formula: C9H10O2, the main research area is acetic acid amyl benzyl butyl alc sugarcane bagasse esterification.

Liquid phase esterification of carboxylic acids with alcs. is an important organic synthesis process in the petrochem. and fine chem. industries. These reactions required mineral acid catalysts, which are corrosive and difficult to be separated from the reaction mixture Therefore, the use of solid acid catalysts is economically viable, reusable, and environmentally amicable. In this study, sugarcane bagasse ash (SCBA) was impregnated with 1-10 weight% of sulfuric acid (H2SO4) or perchloric acid (HClO4) for the liquid-phase esterification of acetic acid with n-amyl, benzyl, and Bu alcs. under various reaction conditions. The catalysts were characterized using X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier-transform IR (FTIR), N2 sorption, and SEM. Their acidities were measured through the dehydration of iso-Pr alc. and pyridine adsorption FTIR. The effects of the acid activation of SCBA on its texture properties (such as surface area and the nature of the surface functional groups), acidity, and catalytic activity were studied in detail. FTIR of the pre-saturated catalysts with pyridine reflected the presence of Bronsted and Lewis acid sites. The concentrations of the acid sites were improved by increasing the percentages of acid loading. All the catalysts showed high catalytic activity with 100% selectivity to ester formation. The catalyst pretreated with H2SO4 showed the higher ester yields compared to that of treated with HClO4. The optimum reaction conditions were a reaction time of 2 h, an alc.-to-acid molar ratio of 1:3, and catalyst loading of 0.5 g. The highest yields of n-amyl acetate, benzyl acetate, and Bu acetate of 98, 90.8, and 70.5%, resp., were achieved over the SCBA pretreated with 10 weight% H2SO4 catalyst. The high catalytic performance of this catalyst is due to the high surface acidity generated by the inductive effect of the S=O bond.

Journal of Environmental Chemical Engineering published new progress about Adsorption. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Formula: C9H10O2.

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

Zhang, Rui published the artcileThermoresponsive hydrophobic copolymer grafted on agar microspheres for all-aqueous bioseparations, Computed Properties of 142-90-5, the main research area is agar microsphere thermoresponsive hydrophobic copolymer graft; N-isopropylacrylamide; agar microspheres; bioseparations; lauryl methacrylate; thermoresponsive polymers.

Agar microspheres were prepared by water-oil emulsification and cross-linked under alk. condition. The thermoresponsive hydrophobic copolymer, poly(N-isopropylacrylamide-co-lauryl methacrylate-co-acrylamide), was grafted on the agar microspheres via atom transfer radical polymerization The agar microspheres grafted with copolymers were characterized by light microphotog., elemental anal., Fourier transform IR spectroscopy, SEM, and XPS. The chain lengths and hydrophobic monomer ratio of the grafting linear polymer had significant effects on the hydrophobicity and adsorption capacity of agar microspheres at different temperatures The thermoresponsive microspheres were used for separation of proteins and showed binding and release behavior by change of temperatures without change in mobile phase composition Thus, we suggest thermoresponsive agar microspheres as an alternative separation media for all-aqueous biosepns.

Journal of Separation Science published new progress about Adsorption. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Computed Properties of 142-90-5.

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

Hao, Guojun published the artcileCatalytic depolymerization of the dealkaline lignin over Co-Mo-S catalysts in supercritical ethanol, Application In Synthesis of 5405-41-4, the main research area is dealkaline lignin catalytic depolymerization property.

In this work, lignin depolymerization was examined over CoMo sulfide catalysts supported on different carriers in supercritical ethanol system. The temperature, time, MoS2 and carrier effects on the lignin depolymerization were investigated. 95.76% liquefaction yield with negligible char was achieved over Co-Mo-S/ZrO2 at 340° for 150 min. The liquid product was mainly composed of C4-C8 alcs., C4-C10 esters and C7-C10 aromatic compounds The synergistic effect of active sites and acid-base sites on support played an important role in lignin depolymerization Furthermore, the Co-Mo-S/ZrO2 catalyst is reusable with 8% loss in liquefaction yield after 5 cyclic runs. We believe that acid/base carriers or additives that can promote the medium to generate abundant free radicals or ions to replace external hydrogen pressure are one of the prospects for the design of depolymerization lignin catalysts.

Biomass and Bioenergy published new progress about Adsorption. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Application In Synthesis of 5405-41-4.

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

Tofalo, Rosanna published the artcileImpact of Saccharomyces cerevisiae and non-Saccharomyces yeasts to improve traditional sparkling wines production, Safety of Ethyl octanoate, the main research area is Saccharomyces cerevisiae Torulaspora delbrueckii sparkling wine production hydrolysis; Aroma compounds; Champenoise method; Saccharomyces cerevisiae; Sparkling wines; Starmerella bacillaris; Torulaspora delbrueckii; non-Saccharomyces yeasts.

In this study the effect of a co-inoculum of S. cerevisiae (F6789) with Torulaspora delbrueckii (TB1) or Starmerella bacillaris (SB48) on the oenol. and aroma characteristics of sparkling wines obtained with the Champenoise method was investigated. The autolytic outcome and the sensory profile of sparkling wines were also evaluated. The secondary fermentations were completed by all mixed and single starter cultures with the only exception of those guided by Starm.bacillaris. Sparkling wines produced with S. cerevisiae F6789+Starm.bacillaris SB48 showed the highest amounts of glycerol (6.51 g/L). The best autolytic potential was observed in sparkling wines produced with +Starm.bacillaris (81.98 mg leucin/L) and S. cerevisiae+T. delbrueckii (79.03 mg leucin/L). The lowest value was observed for sparkling wines obtained with S. cerevisiae F6789 (53.96 mg leucin/L). Sparkling wines showed different aroma and sensory profiles. Esters were mainly present in sparkling wines obtained with S. cerevisiae F6789 (88.09 mg/L) followed by those obtained with S. cerevisiae+T. delbrueckii (87.20 mg/L), S. cerevisiae +Starm.bacillaris (81.93 mg/L). The content of esters decreased over time, and that might be related to the adsorption on lees and chem. hydrolysis. The highest concentrations of higher alcs. were found in sparkling wines produced with S. cerevisiae+T. delbrueckii (27.50 mg/L). Sparkling wines obtained with S. cerevisiae +Starm.bacillaris were well differentiated from the others due to their high score for the descriptor for spicy, bread crust, freshness and floral. Tailored strains with different autolytic potential might represent an interesting strategy to improve traditional sparkling wine production and favor their differentiation.

Food Microbiology published new progress about Adsorption. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Safety of Ethyl octanoate.

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

Abirami, A. L. Alagu published the artcileSynthesis and application of porous oil-sorbent microspheres: Characterization, retention capacity and sorption kinetics, COA of Formula: C16H30O2, the main research area is oil spill water pollution treatment polymer sorbent microsphere.

The article focuses on the study of oil spill cleanup in an aquatic media by comparing the oil sorption capacities of three polymeric sorbents. Styrene – dodecyl methacrylate – DVB with toluene as porogen (P3) showed a highest removal ability of 5 times its weight However, key aspect of this research is associated with the retention capacities of the sorbents. The loss in weight measured over time was found to be numerically insignificant for all the three sorbents. Water contact angle for the sorbents i.e., P1, P2, P3 were found to be 113.3°, 107.2° and 97.5° resp. SEM results confirmed the entrapment of oil between the polymer mols. thereby confirming the phenomenon of sorption. The sorption kinetics of oil over the sorbent surface was followed the pseudo-second order model. The prepared sorbents can be successfully employed for the recovery of oil spills from water sources.

Separation and Purification Technology published new progress about Adsorption. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, COA of Formula: C16H30O2.

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

Gmur, Tobias A. published the artcileTowards a Polymer-Brush-Based Friction Modifier for Oil, Category: esters-buliding-blocks, the main research area is polymer brush oil friction modifier.

To meet the need for oil-compatible friction modifier additives that can significantly reduce energy consumption in the boundary-lubrication regime, a macromol. design approach has been taken. The aim was to produce a lubricious polymer film on the sliding surfaces. A series of readily functionalizable block copolymers carrying an oleophilic poly(dodecyl methacrylate) block and a functionalizable poly(pentafluorophenyl methacrylate) block of various lengths was synthesized by means of reversible addition-fragmentation chain-transfer (RAFT) polymerization The poly(pentafluorophenyl methacrylate) block was used to attach surface-active nitrocatechol anchoring groups to the polymer. The friction-reduction properties of these polymers were assessed with 0.5 wt% solutions in hexadecane by means of rolling-sliding macroscopic tribol. tests. Block copolymers with roughly equal block lengths and moderate mol. weights were significantly more effective at friction reduction than all other architectures investigated. They also displayed lower friction coefficients than glycerol monooleate-a com. used additive. The film-formation ability of these polymers was examined using a quartz-crystal microbalance with dissipation (QCM-D), by monitoring their adsorption onto an iron oxide-coated QCM crystal. The polymer with highest lubrication efficiency formed a thin film of ∼ 17 nm thickness on the crystal, indicating the formation of a polymer brush. Interferometric rolling-sliding experiments with the same polymer showed a separating film thickness of ∼ 20 nm, which is consistent with the QCM-D value, bearing in mind the compression of the adsorbed layers on the two sliding surfaces during tribol. testing.

Tribology Letters published new progress about Adsorption. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Category: esters-buliding-blocks.

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

Xu, Jing published the artcileIn silico screening of potential anti-COVID-19 bioactive natural constituents from food sources by molecular docking, Recommanded Product: 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, the main research area is human covid19 virus anticoronaviral agent mol docking; Angiotensin-converting enzyme 2; COVID-19; Chinese hawthorn and blackberry; Molecular docking; Red wine; SARS-CoV-2 3CL hydrolytic enzyme.

The aim of this study was to seek potential natural compounds that can resist COVID-19 using computer virtual screening technol. through mol. docking of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) 3CL hydrolytic enzyme (3CLpro) and angiotensin-converting enzyme 2 (ACE2). Mol. docking was achieved by using the Autodock Vina software. The natural phytocompounds acting on 3CLpro and ACE2 were then selected from the Traditional Chinese Medicine Systems Pharmacol. Database and Anal. Platform. This was followed by speculation on the mechanism of action of phytocompounds. Six potential natural anti-COVID-19 phytocompounds were selected and were evaluated for absorption, distribution, metabolism and excretion (ADME) and Lipinski rules. The content of the six phytocompounds in various fruits and vegetables was determined via a literature search. Red wine, Chinese hawthorn, and blackberry were recommended as supplements because they contained antiviral phytocompounds. Red wine, Chinese hawthorn, and blackberry show promise for resisting COVID-19 and are thus recommended as supplements to prevent the infection of COVID-19 during its outbreak period.

Nutrition (New York, NY, United States) published new progress about Adsorption. 55981-09-4 belongs to class esters-buliding-blocks, name is 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, and the molecular formula is C12H9N3O5S, Recommanded Product: 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate.

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