Category: esters-buliding-blocks

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

Al-layla, Neam m. t. published the artcileLiquid bio-fuels and carbon adsorbents production via pyrolysis of non-edible feedstock, Computed Properties of 929-77-1, the main research area is biofuel adsorbent pyrolysis activated carbon morphol.

The slow pyrolysis of milk thistle (Silybum marianum L.) seeds (MTS) in a lab-scale batch reactor to investigate the influence of heating rate, temperature, contact period, and particle size on the yields of bio-oil (BO) and bio-char (BC) was presented for the first time. The maximum yield of BO (49.55 ± 2.50%) was obtained at a pyrolysis temperature of 475°C for 60 min using a 0.25 mm MTS particle size at 20°C/min heating rate. The chem. composition of BO from MTS was identified by FTIR, 1H NMR, and GC-MS techniques. Following the FTIR outcomes, aldehydes, alcs., phenols, acids, and alkanes are present in the BO . Also, results from 1HNMR spectrum indicated that the percentage of the aliphatic compounds in the as-synthesized BO was greater than that of the aromatic compounds The GC-MS anal. exhibited that the MTS derived BO is rich in higher acids (38.64%), higher esters (21.30%), and hydrocarbons (11.39%). The elemental anal. consequences revealed that the attained BO possessed a higher carbon content and a lower oxygen content than its resp. MTS with a chem. formula of CH1.67 N0.025O0.10. Addnl., the BO owned a calorific value of 39.47 MJ/kg, close to that established for petro based liquid fuels and comparable to those of BOsamples declared in the literature. Besides, the physic-chem. properties of the MTS derived BO were close to those specified for conventional fossil fuels. Proximate anal., elemental composition, higher heating value, iodine number, surface area, and morphol. of the attained biochar were determined The ZnCl2 activation method was employed to synthesize activated carbon from the produced BC via the optimized procedure. An impregnation ratio of 1.5:1 ZnCl2:BC, 500°C, 60 min activation period, and 0.21 mm particle size were the best conditions to yield an activated carbon with 638.66 mg/g iodine number and 677.22 m2/g surface area. The FESEM results affirmed the mesoporosity of the attained activated carbon compared to the macroporosity of the pristineBC .

Journal of Analytical and Applied Pyrolysis published new progress about Adsorbents. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Computed Properties of 929-77-1.

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

Rong, Hao published the artcileTranscriptional profiling between yellow- and black-seeded Brassica napus reveals molecular modulations on flavonoid and fatty acid content, Recommanded Product: Methyl docosanoate, the main research area is Brassica transcription flavonoid fatty acid phenylpropanoid AIM1 KAT2.

Brassica napus is an important cash crop broadly grown for the vegetable and oil values. Yellow-seeded B. napus is preferred by breeders due to its improved oil and protein quality, less pigments and lignin compared with the black-seeded counterpart. This study compared the differences in flavonoid and fatty acid contents between yellow rapeseed from the progenies of B. napus-Sinapis alba somatic hybrids and the black-seeded counterpart using RNA-seq anal. Through HPLC-PDA-ESI(-)/MS2 anal., it was found that phenylpropanoids and flavonoids (i.e., isorhamnetin, epicatechin, kaempferol, and other derivatives) in yellow seed were significantly lower than those in black seed. The fatty acid (FA) content in yellow rapeseed was higher than that in black rapeseed due to the variation of C16:0, C18:0, C18:1, C18:2, and C18:3 contents. RNA-seq anal. of seeds at four and five weeks after flowering (WAF) indicated that differentially expressed genes (DEGs) between black and yellow rapeseeds were enriched in flavonoid and FA biosynthesis, including BnTT3, BnTT4, BnTT18, and BnFAD2. Also, genes related to FA biosynthesis, desaturation and elongation (FAD3, LEC1, FUS3, and LPAT2) in yellow seed were up-regulated compared to those in black seed, while genes involved in beta-oxidation cycle (AIM1 and KAT2) of yellow seed were down-regulated compared to those in black seed. The DEGs related to the variation of flavonoids, phenylpropanoids, and FAs would help improve the knowledge of yellow seed character in B. napus and promote rapeseed improvement.

Journal of Integrative Agriculture published new progress about Brassica napus (black seed). 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Recommanded Product: Methyl docosanoate.

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

He, Qi published the artcileA superchilling storage-ice glazing (SS-IG) of Atlantic salmon (Salmo salar) sashimi fillets using coating protective layers of Zanthoxylum essential oils (EOs), Application of Benzyl acetate, the main research area is superchilling storage ice coating protective layers zanthoxylum essential oil.

Sashimi is a perishable aquatic product. Low temperature offers a promising avenue to preserve sashimi, but traditional frozen methods can hardly avoid the undesirable effects caused by fluids’ freezing. The aim of this work is to establish a superchilling storage-ice glazing (SS-IG) approach using essential oils (EOs) from Zanthoxylum acanthopodium (ZA) and Zanthoxylum simulans (ZS) to preserve sashimi. Different compound of EOs were identified using GC-MS. Twelve main active compositions accounted for 52.85% and 63.19% of the total oils. Fresh salmon sashimi fillets were coated by 0.3% of EOs and stored at (-1 ± 0.2) °C for 25 days. EOs-based ice-glazing layers were formed on the surface of sashimi, while the fluids in sashimi samples still kept at liquid state. As the results, the microstructure and sensory quality of sashimi were maximally maintained. The growth of microbial populations and production of total volatile basic nitrogen (TVB-N) in sashimi were inhibited. The degree of lipid oxidation in sashimi was limited at a low range. The results revealed this SS-IG approach can effectively retain the overall quality of sashimi during storage and will be a promising means for the development of sushi industry.

Aquaculture published new progress about Oxygenated terpenes Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Application of Benzyl acetate.

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

Limaee, Nargess Yousefi published the artcileSelective Recognition of Herbicides in Water Using a Fluorescent Molecularly Imprinted Polymer Sensor, Category: esters-buliding-blocks, the main research area is dichlorophenoxacetic acid herbicide water fluorescent molecularly imprinted polymer sensor; 1,8-naphthalimide; 2,4-dichlorophenoxyacetic acid; Fluorescent optosensor; Molecularly imprinted polymer.

Fluorescent molecularly imprinted polymer (FMIP) optosensor was utilized for the selective identification of 2,4- dichlorophenoxacetic acid (2,4-D) due to worldwide pollution caused by using herbicides in agricultural industry. In this regards, two derivatives of polymerizable 1,8-naphthalimide namely, 1,8-naphthalimide containing thiourea (NI) and di-Et amine tagged 1,8-naphthalimide (NII) were used as the receptors and 2,4-D was applied as a template. Also, precipitation polymerization was applied to prepare the fluorescent molecularly imprinted polymer (FMIP). The morphol., structural and thermal anal. was carried out using SEM, TEM, EDS, BET, FTIR, DSC and TGA for characterizing the fluorescent optosensor. The adsorption efficiency of FMIP and FNIP was studied using Langmuir, Freundlich, BET and Redlich Peterson isotherms. The results represented that the adsorption of 2,4-D on FMIP and FNIP agreed the Freundlich adsorption isotherm with correlation coefficient of 0.9935 and 0.9801, resp. The prepared sensor was able for the selective determination of 2,4-D salt in the linear range of 5 × 10-7 -1 × 10-3 M with a limit of detection of 16.8 nM. The present study revealed that the FMIP prepared by 1,8-naphthalimide derivative (NI) could potentially recognize the trace concentration of 2,4-D.

Journal of Fluorescence published new progress about Fluorescent biosensors. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Category: esters-buliding-blocks.

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

Xia, Yanan published the artcileNovel insight into physicochemical and flavor formation in koumiss based on microbial metabolic network, COA of Formula: C10H20O2, the main research area is flavor koumiss microbial metabolic network; Core microbiota; Differential metabolites; Koumiss; Metabolic pathway; Volatile metabolites.

Koumiss, naturally fermented mares milk, has a unique flavor that is affected by its resident microflora. In this study, we analyzed time-dependent changes in the microbiota and volatile metabolite profiles of koumiss using high-throughput sequencing and liquid-extraction iquid extraction-gas chromatog.-mass spectrometry. The dominant microrganisms in mare milk were Enterobacter and Rhodotorula, which were gradually suppressed, then Lactobacillus and Dekkera became the core microorganisms of koumiss. 17 FAA and 52 volatile organic compounds (VOCs) were identified during koumiss fermentation, including 19 odor active compounds and 15 differential metabolites of VOCs, mainly acids and esters, and their anabolism showed significant pos. correlations with Lactobacillus and Dekkera. The microbial metabolic network showed that Lactobacillus and Dekkera were identified as the most important flavor-producing microbiota due to their significantly pos. correlation with the formation of 33 and 28 flavor metabolites, resp. These microorganisms produce enzymes that catalyze a series of metabolic pathways that generate VOCs, including carbohydrate metabolism, amino acid metabolism, and fatty acid biosynthesis. Our findings provide new guidance for the screening and application of flavor-producing microorganisms in koumiss.

Food Research International published new progress about Anabolism. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, COA of Formula: C10H20O2.

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

Dirin, Dmitry N. published the artcileMicrocarrier-Assisted Inorganic Shelling of Lead Halide Perovskite Nanocrystals, Application In Synthesis of 142-90-5, the main research area is microcarrier assisted shelling lead halide perovskite nanocrystal; core/shell; lead halide perovskite; luminescence; nanocrystals; stability.

The conventional strategy of synthetic colloidal chem. for bright and stable quantum dots has been the production of epitaxially matched core/shell heterostructures to mitigate the presence of deep trap states. This mindset has been shown to be incompatible with lead halide perovskite nanocrystals (LHP NCs) due to their dynamic surface and low m.p. Nevertheless, enhancements to their chem. stability are still in great demand for the deployment of LHP NCs in light-emitting devices. Rather than contend with their attributes, we propose a method in which we can utilize their dynamic, ionic lattice and uniquely defect-tolerant band structure to prepare non-epitaxial salt-shelled heterostructures that are able to stabilize these materials against their environment, while maintaining their excellent optical properties and increasing scattering to improve out-coupling efficiency. To do so, anchored LHP NCs are first synthesized through the heterogeneous nucleation of LHPs onto the surface of microcrystalline carriers, such as alkali halides. This first step stabilizes the LHP NCs against further merging, and this allows them to be coated with an addnl. inorganic shell through the surface-mediated reaction of amphiphilic Na and Br precursors in apolar media. These inorganically shelled NC@carrier composites offer significantly improved chem. stability toward polar organic solvents, such as γ-butyrolactone, acetonitrile, N-methylpyrrolidone, and trimethylamine, demonstrate high thermal stability with photoluminescence intensity reversibly dropping by no more than 40% at temperatures up to 120 °C, and improve compatibility with various UV-curable resins. This mindset for LHP NCs creates opportunities for their successful integration into next-generation light-emitting devices.

ACS Nano published new progress about Band structure. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Application In Synthesis of 142-90-5.

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

Park, Ho Young published the artcileProperties of bioliquids and their impacts on combustion and boiler operation, Quality Control of 110-42-9, the main research area is bioliquid combustion boiler operation property.

This study reports the results of a detailed anal. of 203 samples of bioliquid used as a substitute for heavy fuel oil in oil-fired power plants. Bioliquid is a mixture of various vegetable oils, animal fats and its byproducts. The heating value of bioliquid is approx. the same as that of heavy fuel oil; however, bioliquid has significantly less N and S components and exhibits better combustion reactivity. For a com. electricity generation, demonstration tests firing bioliquid in 75, 90, and 100 MW oil-fired boilers were conducted, and the results were compared with those obtained by firing heavy fuel oil. Further, the impacts of bioliquid fuel characteristics on combustion and boiler operation were also investigated. During the bioliquid firing, the heat absorption in the furnace decreased and the furnace exit gas temperature increased in comparison to the heavy fuel oil firing. No serious problems occurred in the boiler operation, and NOx and SOx emissions remarkably decreased. With minor modifications on the fuel transfer system and atomization devices, bioliquid could successfully replace heavy fuel oil in the existing oil-fired boilers. The limited values for 18 fuel properties of bioliquid are suggested by considering the stable boiler operation and environmental safety.

Energy (Oxford, United Kingdom) published new progress about Boilers, oil-fired. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Quality Control of 110-42-9.

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

Mhlongo, Msizi I. published the artcileProfiling of Volatile Organic Compounds from Four Plant Growth-Promoting Rhizobacteria by SPME-GC-MS: A Metabolomics Study, Safety of Methyl decanoate, the main research area is PGPR volatile organic compound metabolomics profiling SPME GCMS; metabolomics profiling; multivariate data analysis (MVDA); plant growth promoting rhizobacteria (PGPR); solid-phase micro-extraction gas chromatography mass spectrometry (SPME–GC–MS); volatile organic compounds (VOCs).

The rhizosphere microbiome is a major determinant of plant health. Plant-beneficial or plant growth-promoting rhizobacteria (PGPR) influence plant growth, plant development and adaptive responses, such as induced resistance/priming. These new eco-friendly choices have highlighted volatile organic compounds (biogenic VOCs) as a potentially inexpensive, effective and efficient substitute for the use of agrochems. Secreted bacterial VOCs are low mol. weight lipophilic compounds with a low b.p. and high vapor pressures. As such, they can act as short- or long-distance signals in the rhizosphere, affecting competing microorganisms and impacting plant health. In this study, secreted VOCs from four PGPR strains (Pseudomonas koreensis (N19), Ps. fluorescens (N04), Lysinibacillus sphaericus (T19) and Paenibacillus alvei (T22)) were profiled by solid-phase micro-extraction gas chromatog. mass spectrometry (SPME-GC-MS) combined with a multivariate data anal. Metabolomic profiling with chemometric analyses revealed novel data on the composition of the secreted VOC blends of the four PGPR strains. Of the 121 annotated metabolites, most are known as bioactives which are able to affect metabolism in plant hosts. These VOCs belong to the following classes: alcs., aldehydes, ketones, alkanes, alkenes, acids, amines, salicylic acid derivatives, pyrazines, furans, sulfides and terpenoids. The results further demonstrated the presence of species-specific and strain-specific VOCs, characterized by either the absence or presence of specific VOCs in the different strains. These mols. could be further investigated as biomarkers for the classification of an organism as a PGPR and selection for agricultural use.

Metabolites published new progress about Alcohols Role: ANT (Analyte), PUR (Purification or Recovery), ANST (Analytical Study), PREP (Preparation). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Safety of Methyl decanoate.

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

Belouzard, Sandrine published the artcileClofoctol inhibits SARS-CoV-2 replication and reduces lung pathology in mice, Safety of 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, the main research area is clofoctol antiviral agent SARSCoV2 replication therapy COVID19.

Drug repurposing has the advantage of shortening regulatory preclin. development steps. Here, we screened a library of drug compounds, already registered in one or several geog. areas, to identify those exhibiting antiviral activity against SARS-CoV-2 with relevant potency. Of the 1,942 compounds tested, 21 exhibited a substantial antiviral activity in Vero-81 cells. Among them, clofoctol, an antibacterial drug used for the treatment of bacterial respiratory tract infections, was further investigated due to its favorable safety profile and pharmacokinetic properties. Notably, the peak concentration of clofoctol that can be achieved in human lungs is more than 20 times higher than its IC50 measured against SARS-CoV-2 in human pulmonary cells. This compound inhibits SARS-CoV-2 at a post-entry step. Lastly, therapeutic treatment of human ACE2 receptor transgenic mice decreased viral load, reduced inflammatory gene expression and lowered pulmonary pathol. Altogether, these data strongly support clofoctol as a therapeutic candidate for the treatment of COVID-19 patients.

PLoS Pathogens published new progress about Animal gene Role: BSU (Biological Study, Unclassified), PRP (Properties), BIOL (Biological Study) (Ifi44). 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