Category: 539-88-8

Tu, Ren published the artcileEffect of surfactant on hydrothermal carbonization of coconut shell, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is coconut shell hydrothermal carbonization surfactant; Hydrochar; Hydrothermal carbonization; Pseudo-lignin; Surfactant; Water/oil film.

The effect of surfactant on the hydrothermal carbonization performance and pseudo-lignin formation were investigated. Especially, the fuel properties and combustion characteristics of hydrochar and solid product were determined Furthermore, the mechanism of surfactant acted in hydrothermal carbonization was also identified in this article. The results showed that surfactant improved the content of solid products, lignin, heavy bio-oil (HBO), H2 and CO. Moreover, sodium dodecylbenzenesulfonate promoted the increase of the surface area of hydrochar from 4.93 to 41.43 m2/g. The mechanism showed surfactant formed water/oil film around the hydrochar to prevent HBO from leaving the pore or surface of hydrochar and promoted the condensation and polymerization of 5-hydroxymethylfurfura (5-HMF) with hydroxymethylfurfura (HMF) to form pseudo-lignin. The HBO and pseudo-lignin were beneficial for improving integrated combustion characteristic index (SN) during combustion. The article provides a new method to promote hydrothermal carbonization (HTC) for obtaining high value hydrochar as fuels.

Bioresource Technology published new progress about Aromatic hydrocarbons Role: OCU (Occurrence, Unclassified), OCCU (Occurrence). 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

Bonatto Machado de Castilhos, Mauricio published the artcileSensory descriptive and comprehensive GC-MS as suitable tools to characterize the effects of alternative procedures on wine aroma. Part II: BRS Rub́ea and BRS Cora, SDS of cas: 539-88-8, the main research area is winemaking aroma; Drying; Non-Vitis vinifera; Sensory descriptive analysis; Submerged cap; Volatile compounds; Wine.

The present manuscript assessed the volatile and sensory profiles of BRS Rub́ea and BRS Cora wines elaborated from traditional, grape pre-drying and submerged cap winemaking. The wines contained a higher concentration of acetates (257 mg L-1 to 547 mg L-1) and Et and Me esters (183 mg L-1 to 456 mg L-1) in comparison with Vitis vinifera wines. PCA was applied (explaining 68.43% of the total variance), and the higher concentration of Et decanoate and Et octanoate, di-Et succinate, hydroxylinalool, and 2-Ph ethanol was responsible for describing the BRS Rub́ea wines as fruity/foxy. They also presented an intense jam note, probably due to their higher concentration of syringol and guaiacol. BRS Cora wines exhibited a vegetal note, possibly due to their higher concentration of 1-hexanol and cis-3-hexenol. Wines from pre-dried grapes presented higher concentration of furfural, assuming a bitter/burned almond aroma. Alternative winemaking accounted for suitable changes in wine aroma, enhancing wine quality.

Food Chemistry published new progress about Norisoprenoids Role: ANT (Analyte), PRP (Properties), ANST (Analytical Study). 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

Wahi, Rafeah published the artcileEsterification of Microwave Induced Pyrolytic Oil from Sago Bark Waste, Formula: C7H12O3, the main research area is sago bark waste esterification pyrolytic oil microwave.

In this study, microwave induced pyrolytic oil from sago bark (SB) was subjected to esterification to improve its properties. Improvement on properties of the pyrolytic oil was performed via esterification with ethanol and the presence of sulfuric acid as a catalyst. The optimum esterification condition was studied using general factorial design. The esterified oil (EO) showed improved properties with pH (4-6), reduced moisture content (2.95-3.45%), d. (0.9-1.1 g cm-3), and acid value (39.3-123.4 mg KOH-1 g-1), and maintained the CV (20.2-21.6 MJ kg-1). GC-MS anal. showed that EO was sulfur free, and low in carboxylic acid and oxygenated compounds The optimal esterification condition with optimum quality of EO was at 65°C temperature, 60 min reaction time and 1:1 ethanol to oil volume ratio. Results indicated that the EO can be potentially used in robust combustion engines upon properties refinement.

Waste and Biomass Valorization published new progress about Aldehydes Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

Ma, Yan published the artcileLiquefaction of bamboo biomass and production of three fractions containing aromatic compounds, Synthetic Route of 539-88-8, the main research area is bamboo biomass liquefaction aromatic compound.

Depolymerization of lignin to produce value-added aromatic monomers has attracted increasing attention since these monomers can be used as phenol replacement in production of phenolic resins. Here a one-pot depolymerization of bamboo lignin was investigated to obtain aromatic platforms with low mol. weight using acidic catalyst and ethanol. Three fractions (1#, 2#, and 3#) containing different mol. weight distributions of aromatic compounds could be efficiently extracted using water-organic solvent system via a stepwise fractionation process by gradual removal of solvent. The fractions distribution was found to be primarily dependent on the reaction temperature and time. When the temperature was increased from 160°C to 200°C, the yield of fractions containing aromatic products increased significantly from 19.1 wt% to 27 wt%, the same change trend was found by changing the time, and the yield of aromatic products increased from 22.4% to 26.7% with an increase of time from 10 min to 30 min. The bioproducts were characterized by using gas chromatog./mass spectrometry (GC-MS), gel permeation chromatog. (GPC) and two-dimensional heteronuclear single-quantum coherence (2D HSQC NMR). As evidenced by GC-MS spectra, the three fractions were mainly comprised of phenolic derivatives, and the relative contents of phenolic compounds took up about 80% of the total area of each fraction. With the similar physiochem. properties of the fractions, aromatic platforms could provide a new paradigm of bamboo lignin utilization for renewable energy and value-added biochems.

Journal of Bioresources and Bioproducts published new progress about Aromatic compounds Role: 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, Synthetic Route of 539-88-8.

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

Yang, Hui published the artcileReactive and Mechanistic Insights into the Acid-Catalyzed Conversion of Concentrated C5/C6 Sugars in Ethylene Glycol, Safety of Ethyl 4-oxopentanoate, the main research area is reactive mechanism acid catalyzed sugar ethylene glycol.

It remains a challenging task for the efficient conversion of carbohydrates to value-added chems. at concentrated feedstock solution In this contribution, the acid-catalyzed processing of high-concentration C5/C6 sugars (180 g/L) in the ethylene glycol (EG) solvent system was investigated, and prominent discrepancy was noticed between C5 and C6 sugars. A large amount of liquefied products was achieved in the concentrated C6 sugars EG solution, whereas the main products in the case of C5 sugars were found to be solid humins. The reaction mechanism studies revealed that EG can shelter fructose and reaction intermediates (5-hydroxymethylfurfural and levulinic acid) from the cross-polymerization and self-etherification reactions, thereby reducing the generation of solid humins during the fructose liquidation process. However, in the case of xylose, the copolymerization between EG and furfural (FF) generates a solid resin, thus rendering a high solid product yield. Moreover, the produced FF-EG resin was found to be a polymer with high mol. weight formed by connecting the furan ring and the alkyl structure through an ether bond. This finding provides insights into the acid-catalyzed conversion of concentrated C5/C6 sugars in EG, facilitating rationally designed processes for the valorization of concentrated carbohydrates.

ACS Sustainable Chemistry & Engineering published new progress about Aminoplasts Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Safety of Ethyl 4-oxopentanoate.

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

Gundekari, Sreedhar published the artcileChemo- and Regioselective Synthesis of Arylated γ-Valerolactones from Bio-based Levulinic Acid with Aromatics Using H-β Zeolite Catalyst, Related Products of esters-buliding-blocks, the main research area is regioselective valerolactone levulinic zeolite catalyst biomass renewable.

Catalytic coupling of biomass-based mols. to value-added chem. intermediates is an interesting area in biomass research. Arylated γ-valerolactones (Agvls), promising pharmaceutical intermediates that have significant biol. activity, are primarily synthesized currently through petro-route. In this paper, we report successful biomass-based synthesis of Agvls using levulinic acid (LA) and oxygen or sulfur- substituted aromatics over H-β zeolite as catalyst under solvent-free conditions. Under optimized condition, LA and anisole render 90 % conversion of former with 82 % yield of para-substituted γ-lactone. C-C bond formation followed by intra-mol. esterification is witnessed in the course of the reaction, which is highly chemo- and regioselective. Though catalyst deactivated while reuse due to deposition of organic carbon moieties as deduced from several physicochem. techniques, it could be regenerated by simple calcination.

ChemCatChem published new progress about Beta zeolites Role: CAT (Catalyst Use), USES (Uses) (sodium-exchanged, calcinated). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Related Products of esters-buliding-blocks.

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

He, Yingxia published the artcileUnraveling the chemosensory characteristics of strong-aroma type Baijiu from different regions using comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry and descriptive sensory analysis, HPLC of Formula: 539-88-8, the main research area is chemosensory gas chromatog mass spectrometry; 1-Butanol (PubChem CID: 263); 2,3,5-Trimethyl-6-ethylpyrazine (PubChem CID: 28518); 2,6-Dimethylpyrazine (PubChem CID: 7938); 2-Acetylfuran (PubChem CID: 14505); Chemical and sensory profiles; Chinese strong-aroma type Baijiu; Diethyl succinate (PubChem CID: 31249); Dimethyl disulfide (PubChem CID: 12232); Furfural (PubChem CID: 7362); GC × GC-TOFMS; Methanethiol caproate (PubChem CID: 75515); Multivariate analysis; Regionality.

Comprehensive 2D gas chromatog.-time-of-flight mass spectrometry was combined with descriptive sensory anal. to elucidate the specificity of strong-aroma type Baijiu (Chinese liquor) from different regions, based on regionally distinct flavor characterized by chem. and sensory profiles. Numerous potential aroma compounds (262) were identified, among which 58 aroma compounds were significantly different between the samples from Sichuan and Jianghuai regions. Relationships between these potential aroma compounds and sensory attributes were investigated by partial least squares regression and network anal. The compounds that dominantly contributed to the important sensory attributes were identified. The high pyrazines, furanoids, and carbonyls amounts contributed to the high intensities of the cellar, toasted, and grain aroma profiles of the Sichuan region samples, while the high ester and alc. levels contributed to the fruity and floral aroma profiles of the Jianghuai region samples. This approach may have practical application in flavor characterization of other alc. beverages.

Food Chemistry published new progress about Chemoreceptors Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, HPLC of Formula: 539-88-8.

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

Xu, Yufei published the artcileCatalytic Transfer Hydrogenation of Biomass-derived Levulinates to γ- valerolactone Using Alcohols as H-donors, Formula: C7H12O3, the main research area is review biomass levulinate gamma valerolactone alc hydrogen donor.

Gamma-Valerolactone (GVL) is a kind of significant platform mols. in the modern industry, which can be directly produced from biomass-derivatives, such as sugar, levulinic acid (LA) and Et levulinate (EL). In general, GVL could be produced from LA using gas hydrogen as H-donor with heterogeneous or homogeneous catalysts. But this strategy always has the danger of operation and requirement of unique reactors due to explosive hydrogen as well as the acidity of reactant. Over the past decade, researchers in this field have established new processes and strategies to meet the above problems through the CTH process by using alc. as H-donor and EL as the substrate over different kinds of catalysts. In this review, we collect and discuss the literature on the production of GVL from EL, and applications of LA, EL, and GVL with particular typical mechanisms. The catalyst preparation methods in the mentioned reaction systems are also concerned.

Current Green Chemistry published new progress about Alcohols Role: BCP (Biochemical Process), BIOL (Biological Study), PROC (Process). 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

Qiu, Shuai published the artcileChemoenzymatic catalysis of tert-butyl 6-cyano-(3R,5R)-dihydroxyhexanoate by aldo-keto reductase coupled with composite Fe3O4 nanozyme scaffold, Quality Control of 539-88-8, the main research area is Exiguobacterium glucose dehydrogenase aldoketo reductase iron oxide nanoparticle.

Cofactor NADPH is widely used in enzymic redox reactions, however, its regeneration by glucose dehydrogenase (GDH) suffers from massive glucose consumption, costly wastewater treatment, and low atom efficiency. Herein, Fe3O4 nanoparticles supported on helical multi-walled carbon nanotubes (Fe3O4@HMWCNTs) was prepared and displayed comparable transfer hydrogenation activity to Exiguobacterium sibiricum GDH (EsGDH). We developed a chemoenzymic catalysis based on a combination of an aldo-keto reductase KmAKR with Fe3O4@HMWCNTs scaffold, which asym. synthesized optically pure tert-Bu 6-cyano-(3R,5R)-dihydroxyhexanoate ((3R,5R)-2, > 99.5% dep). Under the optimized conditions, 10 mM NADP+ was converted to NADPH by 5.0 mg Fe3O4@HMWCNTs, in a yield of > 80.0%. The combination of Fe3O4@HMWCNTs with KmAKRM7 completely reduced 10 mM tert-Bu 6-cyano-(5R)-hydroxy-3-oxohexanoate ((5R)-1) to (3R,5R)-2, in a conversion of > 99.0% and dep > 99.5%. Contrast to the previous developed biocatalytic approach with KmAKR and EsGDH, this efficient and compatible nanozyme-enzyme process required neither glucose/alcs. as co-substrate nor a glucose dehydrogenase/alc. dehydrogenase for NADPH regeneration.

Chemical Engineering Science published new progress about Alcohols, chiral Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

Qian, Yu published the artcileDifferentiation and classification of Chinese Luzhou-flavor liquors with different geographical origins based on fingerprint and chemometric analysis, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is Luzhou liquor flavor compound traceability fingerprint chemometric; K-nearest neighbor model (KNN); Luzhou-flavor liquor; fingerprint; flavor compounds; multivariate analysis of variance (MANOVA).

In order to differentiate and characterize Chinese Luzhou-flavor liquor according to geog. origins, the volatile flavor compounds were analyzed for forty com. Luzhou-flavor liquor samples from Sichuan, Jiangsu, and Hubei provinces. A total of 113 volatile flavor compounds were quantified; among them, 29 flavor compounds were quantified according to the internal standard method. The differences in flavor composition among different brands of Luzhou-flavor liquor were compared. A data matrix of 64 (flavor components) × 40 (samples) was studied and interpreted using chemometric anal. The research object could be naturally clustered according to geog. origin (brand) based on the hierarchical cluster anal. (HCA), principal component anal. (PCA) and multivariate anal. of variance (MANOVA) methods. A 100% of predication ability was obtained by the application of K-nearest neighbor model (KNN) for study sample classification. The results demonstrate that the abundance of volatile flavor components in liquors combined with appropriate multivariate statistical methods could be used for the division and traceability of liquors from different geog. origins. This study can provide the basis for the identification of liquor authenticity and the traceability of liquor.

Journal of Food Science published new progress about Acids Role: BUU (Biological Use, Unclassified), BIOL (Biological Study), USES (Uses). 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