Tag: M.W=100-150

Zhao, Geng published the artcileConversion of furfuryl alcohol into ethyl levulinate over glucose-derived carbon-based solid acid in ethanol, COA of Formula: C7H12O3, the main research area is furfuryl alc ethyl levulinate carbon solid acid ethanol conversion; carbon-based solid acid; ethanol; ethyl levulinate; furfuryl alcohol.

In this study, a carbon-based solid acid was created through the sulfonation of carbon obtained from the hydrothermal pretreatment of glucose. Addnl., Et levulinate, a viable liquid biofuel, was produced from furfuryl alc. using the environmentally benign and low-cost catalyst in ethanol. Studies for optimizing the reaction conditions, such as reaction time, temperature, and catalyst loading, were performed. Under the optimal conditions, a maximum Et levulinate yield of 67.1% was obtained. The recovered catalyst activity (Et levulinate yield 57.3%) remained high after being used four times, and it was easily regenerated with a simple sulfonation process. Moreover, the catalyst was characterized using FT-IR, XRD, SEM, elemental anal., and acid-base titration techniques.

Molecules published new progress about Density Role: PRP (Properties), TEM (Technical or Engineered Material Use), USES (Uses). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, COA of Formula: C7H12O3.

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

Tang, Ke published the artcileChemical and Sensory Characterization of Vidal Icewines Fermented with Different Yeast Strains, Formula: C6H12O3, the main research area is icewine volatile compound aroma fermentation.

The aim of this study is to comprehensively investigate the aroma composition and sensory attributes of Vidal icewine fermented with four yeast strains (ST, K1, EC1118, and R2). A total of 485 kinds of volatile components were identified by comprehensive two-dimensional gas chromatog.-time of flight mass spectrometry, among which 347 kinds of volatile compounds were the same in four kinds of sample. The heat map was conducted with 156 volatile compounds, which have aroma contributions, and the anal. results identified the characteristics of the aroma composition of icewine fermented with different yeasts. Quant. descriptive anal. was performed with a trained panel to obtain the sensory profiles. The aroma attributes of honey and nut of the icewine fermented by R2 were much higher than others. Partial least squares discriminant anal. further provided 40 compounds that were mainly responsible for the differences of the aroma characteristics of the icewines fermented by four yeasts. This study provides more data on the current status of Vidal icewines by main com. yeasts.

Fermentation published new progress about Caramel (color). 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Formula: C6H12O3.

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

Zakrzewska, Malgorzata E. published the artcileHigh-pressure phase equilibrium studies of multicomponent (alcohol-water-ionic liquid-CO2) systems, Synthetic Route of 539-88-8, the main research area is alc water ionic liquid carbon dioxide phase equilibrium system.

Selective water (byproduct) separation from reaction mixtures stands as an important process intensification strategy for equilibrium-limited reactions. In this work, the possibility of using a high-pressure biphasic reaction media composed of a hydrophobic ionic liquid, 1-hexy-3-methylimidazolium tetracyanoborate, and carbon dioxide was explored for levulinic acid production from 1,4-butanediol. Vapor-liquid equilibrium measurements were performed for the binary (diol + CO2), ternary (diol + CO2+ IL), and quaternary systems (diol + CO2+ IL + water), at 313.2 K and pressures up to 18 MPa. The static anal. method was used in a high-pressure phase equilibrium apparatus equipped with a visual sapphire cell. The capability of the quaternary system to perform phys. water separation is discussed in this paper.

Cells published new progress about Ionic liquids. 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

Alexandre da Silva, Vivaldo Jr. published the artcileEffect of supercritical carbon dioxide over the esterification of levulinic acid with ethanol using montmorillonite K10 as catalyst, Formula: C7H12O3, the main research area is carbon dioxide levulinic acid ethanol montmorillonite catalyst.

Alkyl levulinates are green chems. that have the ability to modify phys. properties of both gasoline and diesel, which makes their use as fuel additives of great importance. An interesting route for their production is the Et esterification using solid catalysts, which still needs improvement. The use of supercritical CO2 (scCO2) as solvent may enhance the reaction yield, in such a way that the objective of this work was to combine the use of a solid catalyst (montmorillonite K10) and scCO2 to achieve the esterification of levulinic acid to obtain Et levulinate. Moreover, understanding the relationship between the amount of CO2, reactants and the catalyst can be a key to determine how scCO2 works in this type of reaction. The results obtained after a systematic study have shown that the combined effect of scCO2 and montmorillonite K10 allow the obtainment of 90.9 % of conversion after 126 min of reaction at 180 °C, with a molar ratio of 6:1 and 10 wt% of catalyst, while reactions performed using the same conditions and without scCO2 provided 82.9 % of conversion after 138 min. Furthermore, the presence of scCO2 also helped montmorillonite K10 to retain its catalytic activity after 4 reuse cycles, while under the absence of scCO2, a decrease in the levulinic acid conversion was already observed in the first reuse cycle. The results presented in this work are a step further for the use of montmorillonite K10 along with scCO2 in industrial scale.

Journal of CO2 Utilization published new progress about Gasoline Role: PRP (Properties), TEM (Technical or Engineered Material Use), USES (Uses). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Formula: C7H12O3.

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

Yang, Lin published the artcileHighly efficient synthesis of pharmaceutically relevant chiral 3-N-substituted-azacyclic alcohols using two enantiocomplementary short chain dehydrogenases, SDS of cas: 539-88-8, the main research area is keto ester dehydrogenase catalyst enantioselective reduction; hydroxy ester preparation; ketoarene dehydrogenase catalyst enantioselective reduction; aryl alc preparation.

Two stereocomplementary alc. dehydrogenases from Flavobacterium psychrophilum (FpADH) and Flavobacterium sp. was reported. (FsADH), which showed the potential industrial application in highly efficient synthesis of a series of enantiomerically pure 3-N-substituted-azacyclic alochols. Both the enzymes showed high catalytic activity toward the model substrate N-Boc-4-piperidone (NBPO) and presented a strict enantioselectivity for the corresponding alc. products. In addition, both enzymes showed broad substrate scope, including ketoesters, acryl ketones and heterocyclic ketones. Using glucose dehydrogenase coexpressed with each of the enzymes to realize the efficient coenzyme recycling, various pharmaceutically relevant chiral 3-N-Boc azacyclic alcs. were asym. synthesized at high substrate concentrations (343.7-643.8 g/L) and low equilvelent of NADP+ (0.1 mM) with excellent enantioselectivity (> 99.5% e.e), which have met the requirements of biocatalytic processes in the industry and demonstrated the feasibility of FpADH and FsADH for industrial application in the biotransformation of chiral 3-N-substituted-azacyclic alcs. The mol. basis of the enantioselectivity and catalytic efficiency of both enzymes were revealed the by mol. docking and MD simulation anal.

Biochemical Engineering Journal published new progress about Aryl ketones Role: RCT (Reactant), RACT (Reactant or Reagent). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, SDS of cas: 539-88-8.

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

Tanino, Yuka published the artcileEffect of filter cloths on the relationship between fatty acids and ethyl esters during automatic pressing of sake, Formula: C6H12O3, the main research area is filter cloth fatty acid ethyl ester fermentation volatile compound.

Japanese sake is manufactured via the moromi (fermentation mash)-filtration process using filter cloths. We measured volatile compounds accumulated in used filter cloths and detected many esters, including fatty acid Et esters (FAEEs), suggesting that filter cloths adsorb esters from sake. The profile of volatile compounds trapped in filter cloths differed depending on the material. Moreover, we demonstrated that medium and long-chain FAEEs, but not fatty acids (FAs), were decreased in the initial period of practical automatic pressing. These results indicated that medium and long-chain FAEEs are likely to be adsorbed to filter cloths made of polyethylene terephthalate, which is generally used in automatic pressing. The ratio of FAs to FAEEs with 8 and 10 carbons increased after automatic pressing. This is possibly one reason why organoleptic properties are changed after moromi-filtration.

Food Science and Technology Research published new progress about Alkanes Role: BUU (Biological Use, Unclassified), BIOL (Biological Study), USES (Uses). 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Formula: C6H12O3.

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

Voce, Sabrina published the artcileCompositional characterization of commercial sparkling wines from cv. Ribolla Gialla produced in Friuli Venezia Giulia, Quality Control of 5405-41-4, the main research area is Ribolla Gialla sparkling wine terpene norisoprenoid lipid.

Ribolla Gialla (RG) is a white grape variety used in the production of high-quality sparkling wines. It is cultivated in a limited area between Friuli Venezia Giulia (FVG-Northeast Italy) and Slovenia; for this reason, there is little information about the composition and chem. characteristics of the sparkling wines produced. This work used different anal. approaches (FTIR spectroscopy, UHPLC-MS/MS, liquid-liquid extraction, SPE and SPME-GC-MS) to characterize thirty-three com. sparkling RG wines from different areas of FVG. The characteristics included the overall volatile profile and content of terpenes, C13-norisoprenoids, lipids, and metabolites of aromatic amino acids. The aroma profile of RG wines was mainly characterized by fermentative esters and β-damascenone, whereas other norisoprenoids and varietal aromas were below the odor threshold. Appreciable amounts of certain fatty acids were found (e.g., palmitic acid), which could be potentially correlated with greater foam stability. However, high concentrations of aromatic amino acids metabolites highlighted a higher risk of developing atypical aging defects.

European Food Research and Technology published new progress about Esters Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Quality Control of 5405-41-4.

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

Mulik, Nagesh published the artcileSynergetic combination of H2Zr1PW12O40 and Sn-Beta as potential solid acid catalyst for direct one-step transformation of glucose to ethyl levulinate, a biofuel additive, SDS of cas: 539-88-8, the main research area is Bronsted Lewis acid catalyst glucose ethyl levulinate biofuel additive.

Et levulinate (EL) has found wide applications as chems. and biofuel additives. Efficient catalytic conversion of abundantly available glucose to ELs over solid acid catalyst having optimum Bronsted (B) and Lewis (L) acidity is highly appreciated. Present work demonstrated, direct one-step synthesis of EL from glucose over synergized Bronsted (H2Zr1PW12O40) and Lewis (Sn-Beta) acid catalyst. H2Zr1PW12O40 is prepared by exchanging H+ of tungstophosphoric acid (H3PW12O40-heteropolyacid) with Zr, improves the heterogeneity in polar medium by 50%. The combination of a phys. mixture of H2Zr1PW12O40 + Sn-Beta with 80:20 weight ratio was found to be optimum for the maximum EL yield formation of 54% from glucose at 180°C for 3 h, which is probably the highest than reported over the heterogeneous catalyst in ethanol medium. An optimal combination of B and L catalyst and its ratio is found to be crucial for the direct transformation of glucose to EL in one step. The present study also explored that this combined phys. mixture of H2Zr1PW12O40 + Sn-Beta can tolerate glucose concentration up to 30 g/L, which is probably the higher than reported. © 2019 American Institute of Chem. Engineers Environ Prog, 2019

Environmental Progress & Sustainable Energy published new progress about Phase composition Role: PRP (Properties), TEM (Technical or Engineered Material Use), USES (Uses). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, SDS of cas: 539-88-8.

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

Sahu, Preeti published the artcileZeolite-β based molecular sieves: A potential catalyst for esterification of biomass derived model compound levulinic acid, Application of Ethyl 4-oxopentanoate, the main research area is levulinic acid zeolite mol sieve potential catalyst esterification.

A series of hetero ions (iron, boron, gallium, titanium, and zinc [Fe3+, B3+, Ga3+, Ti4+, and Zn2+, resp.)] incorporated zeolite-β is prepared via a simple hydrothermal method within 48 h at 170°. Fourier transform-IR spectroscopy anal. and powder X-ray diffraction (FT-IR and XRD, resp.) studies demonstrated the formation of the crystalline phase of the zeolite framework with BEA structure. Scanning electron microscope (SEM) images showed a uniform spherical shape with a particle size of <1μm. The presence of strong acidic sites and the microporous nature of the materials was evident from sorption studies. The resulting Al-, Ga-, Zn-, and Ti- containing zeolite-β materials showed excellent activity for the esterification of levulinic acid using several alcs. (such as methanol, n-butanol, and amyl alc.) with a levulinate ester yield of more than 95%. Significant advantages of the protocol include good activity, the use of a green solvent, and easy removal of the catalyst via filtration. The catalyst activity remained almost intact even after several reaction cycles. Materials Science for Energy Technologies published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application of Ethyl 4-oxopentanoate.

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

Yang, Zeyu published the artcileEfficient asymmetric synthesis of chiral alcohols using high 2-propanol tolerance alcohol dehydrogenase SmADH2 via an environmentally friendly TBCR system, Application In Synthesis of 539-88-8, the main research area is asym synthesis chiral alc propanol oxidation alc dehydrogenase; thermostatic bubble column reactor system alc dehydrogenase ketone reduction.

Alc. dehydrogenases (ADHs) together with the economical substrate-coupled cofactor regeneration system play a pivotal role in the asym. synthesis of chiral alcs.; however, severe challenges concerning the poor tolerance of enzymes to 2-propanol and the adverse effects of the byproduct, acetone, limit its applications, causing this strategy to lapse. Herein, a novel ADH gene smadh2 was identified from Stenotrophomonas maltophilia by traditional genome mining technol. The gene was cloned into Escherichia coli cells and then expressed to yield SmADH2. SmADH2 has a broad substrate spectrum and exhibits excellent tolerance and superb activity to 2-propanol even at 10.5 M (80%, volume/volume) concentration Moreover, a new thermostatic bubble column reactor (TBCR) system is successfully designed to alleviate the inhibition of the byproduct acetone by gas flow and continuously supplement 2-propanol. The organic waste can be simultaneously recovered for the purpose of green synthesis. In the sustainable system, structurally diverse chiral alcs. are synthesized at a high substrate loading (>150 g L-1) without adding external coenzymes. Among these, about 780 g L-1 (6 M) Et acetoacetate is completely converted into Et (R)-3-hydroxybutyrate in only 2.5 h with 99.9% ee and 7488 g L-1 d-1 space-time yield. Mol. dynamics simulation results shed light on the high catalytic activity toward the substrate. Therefore, the high 2-propanol tolerance SmADH2 with the TBCR system proves to be a potent biocatalytic strategy for the synthesis of chiral alcs. on an industrial scale.

Catalysis Science & Technology published new progress about Biochemical cofactors Role: BCP (Biochemical Process), BPN (Biosynthetic Preparation), BUU (Biological Use, Unclassified), BIOL (Biological Study), PROC (Process), PREP (Preparation), USES (Uses) (regeneration of). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application In Synthesis of 539-88-8.

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