Month: December 2022

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

Ma, Gamaliel Junren published the artcileElucidating How Different Amphipathic Stabilizers Affect BSA Protein Conformational Properties and Adsorption Behavior, HPLC of Formula: 111-11-5, the main research area is amphipath stabilizer bovine serum albumin protein conformation adsorption.

Natural proteins such as bovine serum albumin (BSA) are readily extracted from biol. fluids and widely used in various applications such as drug delivery and surface coatings. It is standard practice to dope BSA proteins with an amphipathic stabilizer, most commonly fatty acids, during purification steps to maintain BSA conformational properties. There have been extensive studies investigating how fatty acids and related amphiphiles affect solution-phase BSA conformational properties, while it is far less understood how amphipathic stabilizers might influence noncovalent BSA adsorption onto solid supports, which is practically relevant to form surface coatings. Herein, we systematically investigated the binding interactions between BSA proteins and different molar ratios of caprylic acid (CA), monocaprylin (MC), and Me caprylate (ME) amphiphiles-all of which have 8-carbon-long, saturated hydrocarbon chains with distinct headgroups-and resulting effects on BSA adsorption behavior on silica surfaces. Our findings revealed that anionic CA had the greatest binding affinity to BSA, which translated into greater solution-phase conformational stability and reduced adsorption-related conformational changes along with relatively low packing densities in fabricated BSA adlayers. On the other hand, nonionic MC had moderate binding affinity to BSA and could stabilize BSA conformational properties in the solution and adsorbed states while also enabling BSA adlayers to form with higher packing densities. We discuss physicochem. factors that contribute to these performance differences, and our findings demonstrate how rational selection of amphiphile type and amount can enable control over BSA adlayer properties, which could lead to improved BSA protein-based surface coatings.

Langmuir published new progress about Adsorption. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, HPLC of Formula: 111-11-5.

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

Jia, Boyu published the artcileSelective production of ethyl levulinate from levulinic acid by lipase-immobilized mesoporous silica nanoflowers composite, Quality Control of 539-88-8, the main research area is ethyl levulinate levulinic acid lipase mesoporous silica nanoflower composite.

Mesoporous silica nanoflowers bearing -NH2 groups were synthesized by the hydrolysis of tetra-Et orthosilicate (TEOS) with reverse microemulsion method, following with the grafting of -NH2 groups by the post modification with (3-Aminopropyl) trimethoxysilane (APTMS). The lipase from C. antarctica was immobilized on the as-synthesized amino-grafted mesoporous silica nanoflowers to fabricate the lipase-immobilized mesoporous silica nanoflowers composite, which was applied for the catalytic transformation of biomass-derived levulinic acid to biofuel Et levulinate (EL), and exhibited excellent catalytic activity. An Et levulinate yield as high as 99.5% could be achieved at 40°C in 8 h reaction time, which was much higher than that catalyzed by the free lipase (67.9%) under the identical conditions. The immobilized lipase showed good stability and recyclability that Et levulinate yields above 68% could be remained after seven recycle times. This work represents a novel strategy to construct the immobilized biocatalyst for the production of bio-based chems.

Fuel Processing Technology 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, Quality Control of 539-88-8.

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

Xu, Dan published the artcileSelective oxidation of alcohols to high value-added carbonyl compounds using air over Co-Co3O4@NC catalysts, HPLC of Formula: 110-42-9, the main research area is alc carbonyl compound cobalt tetraoxide carbon catalyst selective oxidation.

The sustainable catalytic transformation of alcs. to high value-added fine chems. is a significant and challenging research topic. Herein, a set of nitrogen-doped carbon encapsulated Co-based catalysts (Co-Co3O4@NC-T) were prepared by using low-cost dicyandiamide, glyoxal and cobalt nitrate as precursors. The obtained catalysts were utilized for the selective oxidation of alcs. to high value-added esters and carboxylic acids with air as the oxygen source and displayed wide applicability for the oxidation of both aromatic and aliphatic alcs. Based on the controlled experiments, the protective effect of N-doped carbon structure and the synergistic effect between Co core and Co3O4 species guaranteed the high reaction conversion and selectivity. Benefitting from heterogeneity and magnetism of the catalyst, it can be easily recycled and reused for long-term stability. Reasonable mechanisms of selective oxidation reaction were proposed through EPR anal. and controlled experiments The present work provides a facile strategy for potential large-scale preparation of heterogeneous catalyst for sustainable and green catalytic transformations.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Adsorption. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, HPLC of Formula: 110-42-9.

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

Peng, Lincai published the artcileMechanistic insights into the effect of the feed concentration on product formation during acid-catalyzed conversion of glucose in ethanol, Synthetic Route of 539-88-8, the main research area is acid catalyzed conversion glucose mechanistic study.

Catalytic upgradation of carbohydrates in concentrated feeds well conforms to the demands for the industrial deployment of bio-based fuels and chems., but the majority of existing explorations merely focused on the utilization of dilute feedstock. In this contribution, the degradation behavior of both dilute (20 g L-1) and concentrated glucose (200 g L-1) in an ethanol medium was comparatively investigated by acid catalysis. The increase of the glucose concentration from 20 to 200 g L-1 largely boosted the formation of water-soluble oligomers (WSO) instead of solid humins (SHU). The high initial glucose concentration favored the formation of glucose oligomers, and the high instantaneous concentration of EL and 5-hydroxymethylfurfural (HMF) also exacerbated the polymerization reactions, both of which are responsible for the formation of excessive WSO in a concentrated feed. Structural characterization revealed that substituted furans, 2,5-dioxo-6-hydroxyhexanal (DHH) and its analog are the main fragments in WSO20, while WSO200 largely consisted of glucosyl units as well as furanic and aromatic fragments linked with aliphatic units, leading to the distinct structure of SHU from the two feed concentrations This work provides insights into the effect of the feed concentration on product formation during acid-catalyzed ethanolysis of glucose, facilitating the development of optimal processes for valorizing concentrated sugars.

Green Chemistry 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, Synthetic Route of 539-88-8.

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

Hu, Aiyun published the artcileNovel Sulfonic Acid Polystyrene Microspheres for Alcoholysis of Furfuryl Alcohol to Ethyl Levulinate, Computed Properties of 539-88-8, the main research area is furfuryl alc ethyl levulinate polystyrene microsphere structural property.

In order to further improve the catalytic activity and stability of heterogeneous acid catalysts, a polystyrene microspheres modified sulfonic acid-based catalyst (PS-SO3H) was prepared PS-SO3H was characterized by Fourier transform IR spectroscopy, powder X-ray diffraction, scanning electron microscope, transmission electron microscope, N2 adsorption-desorption, and XPS. Catalytic efficiency was determined using the reaction of furfuryl alcoholysis to Et levulinate (EL). The obtained results showed that PS-SO3H had excellent catalytic performance, with EL yield of 94.7%. In addition, PS-SO3H was easily separated from the reaction system and recycled multiple times without significant reduction in activity. High catalytic activity stemmed from the effect of Bronsted acid sites and appropriate structural properties.

Catalysis Letters 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, Computed Properties of 539-88-8.

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