Month: December 2022

Krishnamoorthi, M. published the artcileExperimental, numerical and exergy analyses of a dual fuel combustion engine fuelled with syngas and biodiesel/diesel blends, HPLC of Formula: 929-77-1, the main research area is syngas biodiesel diesel combustion engine exergy simulation modeling.

This work investigates the effects of addition of syngas and biodiesel on a reactivity controlled compression ignition (RCCI) engine fuelled with diesel. SEM (SEM) of exhaust particulate matter has been done to obtain particulate matter (PM) morphol. Energy and exergy analyses have been performed to observe energy and availability shares, and to provide directions for the energy recovery systems. Closed cycle combustion simulations have been performed to complement the exptl. results and for an improved understanding of in-cylinder dynamics. Based on the initial study, used cooking oil based biodiesel blend (B20, 20% biodiesel) has been chosen in experiments The optimal operating conditions for syngas/diesel and syngas/B20 in RCCI mode for different operating parameters have been investigated. Injection pressure, injection timing and pre-injection mass ratio have been modified to get improved combustion efficiency at mid-load. Syngas/diesel mode with an injection timing of 19° before top dead center (bTDC) shows slightly higher brake thermal efficiency (BTE) with 22% and 77% lower oxides of nitrogen (NOx) and PM resp. as compared to conventional diesel combustion. In syngas/B20 mode, a maximum BTE of 24% has been observed for the case with a pre-injection at 50° bTDC with 30% mass fraction and 18° bTDC main injection timing. Syngas/diesel shows a reduction in primary soot particle count by about 67% and contains larger aggregates as compared to neat diesel.

Applied Energy published new progress about Aggregates. 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

Krishnamoorthi, M. published the artcileExperimental, numerical and exergy analyses of a dual fuel combustion engine fuelled with syngas and biodiesel/diesel blends, Recommanded Product: Methyl octanoate, the main research area is syngas biodiesel diesel combustion engine exergy simulation modeling.

This work investigates the effects of addition of syngas and biodiesel on a reactivity controlled compression ignition (RCCI) engine fuelled with diesel. SEM (SEM) of exhaust particulate matter has been done to obtain particulate matter (PM) morphol. Energy and exergy analyses have been performed to observe energy and availability shares, and to provide directions for the energy recovery systems. Closed cycle combustion simulations have been performed to complement the exptl. results and for an improved understanding of in-cylinder dynamics. Based on the initial study, used cooking oil based biodiesel blend (B20, 20% biodiesel) has been chosen in experiments The optimal operating conditions for syngas/diesel and syngas/B20 in RCCI mode for different operating parameters have been investigated. Injection pressure, injection timing and pre-injection mass ratio have been modified to get improved combustion efficiency at mid-load. Syngas/diesel mode with an injection timing of 19° before top dead center (bTDC) shows slightly higher brake thermal efficiency (BTE) with 22% and 77% lower oxides of nitrogen (NOx) and PM resp. as compared to conventional diesel combustion. In syngas/B20 mode, a maximum BTE of 24% has been observed for the case with a pre-injection at 50° bTDC with 30% mass fraction and 18° bTDC main injection timing. Syngas/diesel shows a reduction in primary soot particle count by about 67% and contains larger aggregates as compared to neat diesel.

Applied Energy published new progress about Aggregates. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Recommanded Product: Methyl octanoate.

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

Balafouti, Anastasia published the artcileP( OEGMA-co-LMA ) hyperbranched amphiphilic copolymers as self-assembled nanocarriers, Category: esters-buliding-blocks, the main research area is hyperbranched amphiphilic copolymer preparation curcumin drug delivery bioimaging.

We report on the synthesis of novel amphiphilic hyperbranched copolymers, namely Hyperbranched-[poly (ethylene glycol) Me ether methacrylate-co-lauryl methacrylate] (H-[P(OEGMA-co-LMA)]), obtained by reversible addition-fragmentation chain transfer (RAFT) polymerization utilizing the divinyl monomer, ethylene glycol dimethacrylate (EGDMA) as the branching agent. Mol. characterization by size exclusion chromatog. (SEC) and proton NMR (1H-NMR) spectroscopy indicated the success of the polymerization The self-assembly behavior in aqueous media was investigated by light scattering techniques and fluorescence spectroscopy. The hyperbranched copolymers form multimol. aggregates of nanoscale dimensions with a low critical aggregation concentration In addition, the model hydrophobic drug, curcumin (CUR), known also for its intrinsic fluorescence properties, was used in order to investigate the H-[P(OEGMA-co-LMA)] copolymers drug encapsulation ability. Curcumin is successfully loaded into the polymeric nanoparticles, as confirmed by dynamic light scattering and UV-Vis spectroscopy. Interestingly, curcumin hydrophobic interactions with the hyperbranched copolymers result in more well-defined co-assembled nanostructures, in terms of size and size distribution. The mixed copolymer-CUR nano-assemblies consist of small size nanoparticles (<100 nm) which exhibit relatively high size uniformity, colloidal stability and fluorescent properties. Overall, results signify that the biocompatible H-[P(OEGMA-co-LMA)] nanostructures could potentially serve as nanocarrier systems for drug delivery and bio-imaging applications. Journal of Polymer Science (Hoboken, NJ, United States) published new progress about Aggregates. 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

Kafetzi, Martha published the artcileMultifaceted pH and Temperature Induced Self-Assembly of P(DMAEMA-co-LMA)-b-POEGMA Terpolymers and Their Cationic Analogues in Aqueous Media, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is amphiphilic polymethacrylate diblock terpolymer self assembly RAFT polymerization.

This work focuses on the synthesis of novel amphiphilic block terpolymers of the type poly[(2-(N,N-dimethylamino) Et methacrylate)-co-(lauryl methacrylate)]-b-poly[(oligo ethylene glycol) Me ether methacrylate] (P(DMAEMA-co-LMA)-b-POEGMA) by reversible addition-fragmentation chain transfer polymerization The cationic amphiphilic polyelectrolyte analogs P(QDMAEMA-co-LMA)-b-POEGMA are obtained through quant. quaternization of the DMAEMA segments. Mol. characterization by size exclusion chromatog., NMR, and Fourier Transform IR spectroscopies indicates the successful synthesis of these novel series of block terpolymers. The amine forms of the block copolymers respond to pH and temperature changes in aqueous solutions by forming unimol. or multichain nanoaggregates of varying size, micropolarity, and internal structure, as indicated by light scattering and fluorescence spectroscopy techniques. At neutral and basic pH, the existence of micellar like nanoassemblies is observed in the solutions of P(DMAEMA-co-LMA)-b-POEGMA terpolymers, while aggregation into micellar-like clusters take place at temperature values above room temperature due to the presence of the hydrophobic LMA segments. Unexpectedly, the cationic polyelectrolytes P(QDMAEMA-co-LMA)-b-POEGMA counterparts show temperature responsiveness as a consequence of the amphiphilicity of the polymeric system.

Macromolecular Chemistry and Physics published new progress about Aggregates. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Recommanded Product: Dodecyl 2-methylacrylate.

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

Cadegiani, F. A. published the artcileEarly COVID-19 therapy with azithromycin plus nitazoxanide, ivermectin or hydroxychloroquine in outpatient settings significantly improved COVID-19 outcomes compared to known outcomes in untreated patients, Recommanded Product: 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, the main research area is azithromycin nitazoxanide ivermectin hydroxychloroquine COVID therapy human; Antiandrogen; COVID-19; SARS-CoV-2; clinical equipoise; dutasteride; hydroxychloroquine; ivermectin; nitazoxanide; proxalutamide; spironolactone.

In a prospective observational study (pre-AndroCoV Trial), the use of nitazoxanide, ivermectin and hydroxychloroquine demonstrated unexpected improvements in COVID-19 outcomes when compared to untreated patients. The apparent yet likely pos. results raised ethical concerns on the employment of further full placebo controlled studies in early-stage COVID-19. The present anal. aimed to elucidate, through a comparative anal. with two control groups, whether full placebo-control randomized clin. trials (RCTs) on early-stage COVID-19 are still ethically acceptable. The Active group (AG) consisted of patients enrolled in the Pre-AndroCoV-Trial (n = 585). Control Group 1 (CG1) consisted of a retrospectively obtained group of untreated patients of the same population (n = 137), and Control Group 2 (CG2) resulted from a precise prediction of clin. outcomes based on a thorough and structured review of indexed articles and official statements. Patients were matched for sex, age, comorbidities and disease severity at baseline. Compared to CG1 and CG2, AG showed reduction of 31.5-36.5% in viral shedding (p < 0.0001), 70-85% in disease duration (p < 0.0001), and 100% in respiratory complications, hospitalization, mech. ventilation, deaths and post-COVID manifestations (p < 0.0001 for all). For every 1000 confirmed cases for COVID-19, at least 70 hospitalizations, 50 mech. ventilations and five deaths were prevented. Benefits from the combination of early COVID-19 detection and early pharmacol. approaches were consistent and overwhelming when compared to untreated groups, which, together with the well-established safety profile of the drug combinations tested in the Pre-AndroCoV Trial, precluded our study from continuing employing full placebo in early COVID-19. New Microbes and New Infections published new progress about Age groups. 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

AbdelGhaffar, Muhammad M. published the artcilePrediction of mortality in hospitalized Egyptian patients with Coronavirus disease-2019: A multicenter retrospective study, Safety of 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, the main research area is prediction mortality human coronavirus disease.

A aimed to assess the epidemiol., clin., and laboratory characteristics associated with mortality among hospitalized Egyptian patients with COVID-19. A multicenter, retrospective study was conducted on all polymerase chain reaction (PCR)-confirmed COVID-19 cases admitted through the period from Apr. to July 2020. A generalized linear model was reconstructed with covariates based on predictor’s statistical significance and clin. relevance. The odds ratio (OR) was calculated by using stepwise logistic regression modeling. A total of 3712 hospitalized patients were included; of them, 900 deaths were recorded (24.2%). Compared to survived patients, non-survived patients were more likely to be older than 60 years (65.7%), males (53.6%) diabetic (37.6%), hypertensive (37.2%), and had chronic renal insufficiency (9%). Non-survived patients were less likely to receive azithromycin (p <0.001), anticoagulants (p <0.001), and steroids (p <0.001). In this found that age ≥ 60 years old (OR = 2.82, 95% CI 2.05-3.86; p <0.0001), diabetes mellitus (OR = 1.58, 95% CI 1.14-2.19; p = 0.006), hypertension (OR = 1.69, 95% CI 1.22-2.36; p = 0.002), chronic renal insufficiency (OR = 3.15, 95% CI 1.84-5.38; p <0.0001), tachycardia (OR = 1.65, 95% CI 1.22-2.23; p <0.001), hypoxemia (OR = 5.69, 95% CI 4.05-7.98; p <0.0001), GCS <13 (OR 515.2, 95% CI 148.5-1786.9; p <0.0001), the use of therapeutic dose of anticoagulation (OR = 0.4, 95% CI 0.22-0.74, p = 0.003) and azithromycin (OR = 0.16, 95% CI 0.09-0.26; p <0.0001) were independent neg. predictors of mortality. In conclusion, age >60 years, comorbidities, tachycardia, hypoxemia, and altered consciousness level are independent predictors of mortality among Egyptian hospitalized patients with COVID-19. On the other hand, the use of anticoagulants and azithromycin is associated with reduced mortality.

PLoS One published new progress about Age groups. 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, Safety of 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate.

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

Gluchowski, Artur published the artcileFresh Basil Infusion: Effect of Sous-Vide Heat Treatment on Their Volatile Composition Profile, Sensory Profile, and Color, Synthetic Route of 111-11-5, the main research area is basil volatile composition sensory color profile sousvide heat treatment; basil; color; infusion; sensory quality; sous-vide; volatile compounds profile.

Herbs, including basil, are used to enhance the flavor of food products around the world. Its potential is influenced by the quality of fresh herbs and processing practices, wherein conditions of heat treatment play an important role. The aim of the research was to determine the effect of sous-vide heat treatment on the volatile compounds profile, sensory quality, and color of basil infusions. The material used for research was aqueous basil infusion prepared conventionally at 100°C, and using the sous-vide method (65, 75, and 85°C). The composition of volatile compounds was identified by GC/MS anal., the sensory profile was assessed using a group of trained panelists, while the color was instrumentally assessed in the CIE Lab system. No significant differences were found in the intensity of the taste and aroma of basil infusions at different temperatures Seventy headspace volatile compounds were identified in the analyzed samples, ten of which exceeded 2% of relative area percentage. The most abundant compounds were eucalyptol (27.1%), trans-ocimene (11.0%), β-linalool (9.2%), and β-myrcene (6.7%). Most of the identified compounds belonged to the terpenes and alcs. groups. Our findings show that the conventional herbal infusion was more like a sous-vide infusion prepared at the lowest temperature SV65, while SV75 and SV85 were similar to each other but different from the conventional. However, a smaller number of volatile compounds in the samples heated at higher temperatures of sous-vide were identified. The sous-vide samples showed a higher content of alkanes. The sous-vide method (p ≤ 0.05) resulted in darker, less green, and less yellow basil leaves than fresh and traditionally steeped ones. Long heat treatment under vacuum at higher temperatures causes a pronounced change in the aroma composition

Molecules published new progress about Aftertaste. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Synthetic Route of 111-11-5.

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

Shabani, Mahtab published the artcileLong-lasting adsorption of golden flower oil on polyvinyl alcohol/clinoptilolite (PVA/CP) xerogel particles, COA of Formula: C13H18O3, the main research area is polyvinyl alc clinoptilolite xerogel golden flower oil adsorption.

The present work aimed to study the adsorption and desorption characteristics of Golden Flower Oil (GFO) on xerogel particles made of Clinoptilolite (CP), a natural zeolite and polyvinyl alc. (PVA). Firstly, chem. composition and phys. characteristics of GFO (by GC/MS) and CP (by SEM and BET) were thoroughly characterized. PVA/CP xerogel was synthesized then and characterized by SEM, BET, TGA, and DSC techniques. Adsorption of the 12 GFO components on the CP and PVA/CP xerogel surface was investigated in different concentrations of GFO components. Both adsorbents showed concentration-independent and selective adsorption for GFO components. The selective adsorption index showed a direct relationship with polarity (δP) of the components and inversely correlated with their molar volume (Vm). Adsorption isotherms of the components were fitted by Langmuir, Freundlich, and Temkin equations. Maximum monolayer GFO adsorption on PVA/CP surface was equal to 231.93 mg g-1 compared to 198.73 mg g-1 for CP as an adsorbent. The maximum desorbed amount for each of the components was directly related to the Vm parameter and the weight percentage of each GFO component in the oil and inversely related to δP. Multilayer desorbed amount from PVA/CP xerogel particles (366.03 mg g-1) was less than that for CP particles (573.36 mg g-1) supporting PVA/CP for retaining GFO for longer periods.

Applied Clay Science published new progress about Adsorption. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, COA of Formula: C13H18O3.

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

Tian, Hongli published the artcileSulfated attapulgite for catalyzing the conversion of furfuryl alcohol to ethyl levulinate: Impacts of sulfonation on structural transformation and evolution of acidic sites on the catalyst, Product Details of C7H12O3, the main research area is ethyl levulinate furfuryl alc sulfated attapulgite sulfonation catalyst.

Attapulgite (ATTP) is an abundant natural magnesium aluminosilicate mineral that can be used as support for manufacturing cost-effective solid acid catalysts. This study mainly focuses on structural change of ATTP and the formation of Bronsted and Lewis acid sites during sulfonation in H2SO4. The results indicate that the sulfonation leads to the drastic change of the crystal phases as sulfuric acid not only plays the roles of grafting the sulfur species but also reacts with the CaO, MgO, Al2O3 and Fe2O3 or their salts in ATTP to form the sulfates, resulting in the substantial change of the porous structure of ATTP. In such a process, the Bronsted acidic sites, which are the main active sites for the conversion of furfuryl alc. (FA) to Et levulinate (EL), are introduced, while the abundance/strength of the Lewis acid sites are enhanced. The yield of EL up to 95.4% is achieved over the H2SO4/ATTP catalyst. The Fe2(SO4)3 and MgSO4 in the catalyst leaches in ethanol but does not affect the catalytic stability. The formed polymer also does not affect much the catalytic activity after their removal via the calcination in air.

Renewable Energy 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, Product Details of C7H12O3.

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

Gao, Xiaoqing published the artcileRu/CeO2 catalyst with optimized CeO2 morphology and surface facet for efficient hydrogenation of ethyl levulinate to γ-valerolactone, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is ruthenium ceria catalyst surface facet ethyl levulinate hydrogenation valerolactone.

Three Ru/CeO2 catalysts with different CeO2 morphol. (nanorod, nanocube and nano-octahedra) mainly exposed (1 1 0) + (1 0 0), (1 0 0) and (1 1 1) facets for hydrogenation of biomass-derived Et levulinate (EL) to valuable γ-valerolactone (GVL). Ru/CeO2-rod with exposed (1 1 0) crystal plane obtained the highest GVL yield (99.4%) and best productivity (13140 h-1). The surface facets of CeO2 supports not only affect the chem. states of Ru species but also tune the concentration of oxygen vacancy in Ru-CeO2 interface. The concentration of oxygen vacancy shows a linear relationship with GVL production rate. DFT calculations indicate that the lactonization of CH3CHOCH2CH2CO* to produce GVL is the rate-determining step in EL hydrogenation, and Ru10/CeO2 (1 1 0) with more oxygen vacancy has low activation energy barrier, compared to Ru10/CeO2 (1 0 0) and Ru10/CeO2 (1 1 1).

Journal of Catalysis 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