Month: December 2022

Gundekari, Sreedhar published the artcileSelective preparation of renewable ketals from biomass-based carbonyl compounds with polyols using β-zeolite catalyst, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is zeolite preparation surface area catalyst ketal preparation; levulinic acid ester polyol zeolite catalyst ketalization; ketal selective preparation zeolite catalyst.

The preparation of ketals from biomass-based carbonyl compounds and polyols was demonstrated. The emphasis is on levulinate-based ketals using Et levulinate (EL) with ethylene glycol (EG) or glycerol (Gly) as polyols. Among the catalysts screened, Na-β zeolite resulted in 99% conversion of EL with 100% selectivity for the corresponding ketal within 1 h, when used in conjunction with azeotropic distillation in cyclohexane medium. Using Gly as the polyol, a similar yield and selectivity was obtained, albeit after a longer reaction time (4 h). The authors explored the reaction scope by using a multitude of biomass-based ketones and polyols as reactants, which showed excellent selectivity for the ketals. Slight deactivation of the catalyst was observed after reaction, owing to the deposition of organic carbon on the catalyst, which was identified using anal. tools. The deactivated catalyst was regenerated on calcination. This strategy was successfully demonstrated for ketal preparation using crude glycerol with EL.

Molecular Catalysis published new progress about Carbonyl compounds (organic) 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, Recommanded Product: Ethyl 4-oxopentanoate.

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

Yu, Zhihui published the artcileComparative analysis of lipid profiles and flavor composition of marinated eggs from different species, Synthetic Route of 140-11-4, the main research area is chicken quail pigeon marinated egg flavor lipid.

This study compared lipid profiles and volatile composition in marinated eggs from different species (chicken, quail, and pigeon) using LC-ESI-MS/MS, and GC-MS, resp. The three marinated eggs showed significant differences in phosphatidylcholine, phosphatidylethanolamine (PE), and neutral lipid profiles of the three marinated eggs. Pigeon-eggs contained the highest content of PE but the lowest content of triglycerides. Seventy-six potential lipid metabolites such as Cer(d18:1/21:0), DG(15:0/18:2), and PE-O(16:1/18:2) were selected for the discrimination of all three groups. Pigeon-eggs contained the highest contents of C18:2 and C22:6, as well as n-3 and n-6 PUFA than quail-eggs and chicken-eggs. Major compounds including 2-Nonanone, 1-Octen-3-ol, and cyclic octaat. sulfur have greatly contributed to the distinction of eggs from different species. The highest levels of aldehydes, acids, and ketones were found in chicken-eggs. This study reported that lipidomic and volatile composition anal. are promising approaches for discriminating of marinated eggs from different species. Novelty impact statement : This is the first study that aiming at comparing the lipid profiles and volatile composition in marinated eggs from different species (chicken, quail, and pigeon) using LC-ESI-MS/MS and GC-MS. Pigeon-eggs contained the highest contents of glycerol phospholipid, n-3, and n-6 PUFA. The predominating volatile compositions of marinated eggs were alcs. aldehydes acids and ketones. Therefore, this study provides a better understanding of the quality of marinated eggs, and help customers to better choose higher nutritional values of marinated eggs.

Journal of Food Processing and Preservation published new progress about Alcohols Role: ANT (Analyte), BSU (Biological Study, Unclassified), FFD (Food or Feed Use), ANST (Analytical Study), BIOL (Biological Study), USES (Uses). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Synthetic Route of 140-11-4.

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

Wang, Jiatong published the artcileInsights into crucial odourants dominating the characteristic flavour of citrus-white teas prepared from citrus reticulata Blanco ‘Chachiensis’ and Camellia sinensis ‘Fudingdabai’, COA of Formula: C9H18O2, the main research area is Citrus Camellia white tea odorant flavor; Aroma quantification; Characterized odourants; Citrus-white tea; Odour activity value; SBSE-GC-O/MS.

Citrus-white teas (CWs), which possess a balanced flavor of tea and citrus, are becoming more popular worldwide; however, their characteristic flavor and odourants received limited research. Volatile components of two types of CWs prepared from Citrus reticulata Blanco’Chachiensis’ and Camellia sinensis ‘Fudingdabai’ were comprehensively investigated using a combination of stir bar sorptive extraction and gas chromatog.-mass spectrometry (GC-MS). Ninety-nine crucial odourants in the CWs were quantified by applying GC-olfactometry/MS, significant differences were compared, and their odor activity values (OAVs) were calculated Twenty-two odourants (in total 2628.09 and 1131.18 mg/kg resp.) were further confirmed as traditional CW (CW-A) and innovated CW (CW-B) characteristic flavor crucial contributors which all possessed > 1 OAVs, particularly limonene (72919 in CW-A) and trans-β-ionone (138953 in CW-B). The unravelling of CWs aroma composition will greatly expanding our understanding of tea aroma chem. and the potential aroma interactions will offer insights into tea blending technologies.

Food Chemistry published new progress about Alcohols Role: ANT (Analyte), BSU (Biological Study, Unclassified), FFD (Food or Feed Use), ANST (Analytical Study), BIOL (Biological Study), USES (Uses). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, COA of Formula: C9H18O2.

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

Priyadharisini, J. published the artcilePreliminary phytochemical screening and gas chromatography and mass spectrometry analysis of chloroform extract of Garcinia cambogia fruits, Recommanded Product: Methyl docosanoate, the main research area is Garcinia fruit chloroform extract phytochem GCMS analysis.

Garcinia cambogia fruit commonly known as Malabar tamarind, belongs to the family Clusiaceae, is said to show varied medicinal effects including antiobesity, antiviral, antimicrobial, anti-inflammatory, and anticancer. Hence, the present study deals with the determination of phytochem. constituents present in the chloroform extract of G. cambogia fruits and determination of bioactive compounds using the gas chromatog. and mass spectrometry anal. (GC-MS) technique. The phytochem. constituents present in the chloroform extract of G. cambogia fruits were tested by qual. anal., and bioactive compounds were investigated using the GC-MS technique. The anal. was carried out on a JOEL GC MATERI system with a column packed with a column HP5MS (5% Ph, methylpolysiloxane) fused capillary column (30 x 0.25 μm ID x 0.25 μm df). The compounds are separated using helium as a carrier gas at a constant flow 1 mL/min. The mass spectra of the known compounds in the fruit extract were matched with the known components stored in the National Institute of Standard and technol. library. The phytochem. test revealed the presence of xanthones, flavonoids, phlobatannins, terpenoids steroids, phenolic compounds saponins, and anthraquinones. The GC-MS anal. provided peaks of 13 different bioactive compounds, namely 3,7,11,15-tetramethyl-2-hexadecenol (37.1%), pentadecanoic acid 14-methyl-, methylester (100%), hexadecanoic acid 15 methyl-, Me ester (100%), 9,12-octadecadienoic acid Me ester (42.6%), docosanoic acid (100%), docosanoic acid Me ester (37.3%), phenol, 2,4,bis-(1,1-dimethylethyl) (100%), 9, hexadecanoic acid Me ester (99.2%), 10-octadecenoic acid methylester (100%), 11 eicosenoic acid Me ester (53.1%), heptadecanoic acid 9 methyl-, Me ester (100%), eicosenoic acid Me ester (56.9%), and 5, 12d ethanofuro oxepino[2,3,4-mn] (2,3,4-ed) anthrace2-one 9,12-dilol 6 Me,2a 3,4,4a,5,6,7,8a-octahydro (19%) were reported. The phytochem. investigation and determination of bioactive compounds will be considered for pharmacol. activities, and further isolation of individual components would however help to find new drugs.

Asian Journal of Pharmaceutical and Clinical Research published new progress about Carbohydrates Role: ANT (Analyte), PAC (Pharmacological Activity), THU (Therapeutic Use), ANST (Analytical Study), BIOL (Biological Study), USES (Uses). 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

De Lucia, Nicholas A. published the artcileSilica Supported Molecular Palladium Catalyst for Selective Hydrodeoxygenation of Aromatic Compounds under Mild Conditions, SDS of cas: 140-11-4, the main research area is silica supported mol palladium catalyst arene selective hydrodeoxygenation.

The mol. complex chloro(2,2′:6′,2”-terpyridine-4′-carboxylic acid)palladium(II) chloride was synthesized and was attached to the surface of amorphous silicon dioxide to generate a mol./heterogeneous catalyst motif. This catalytic system exhibited excellent selectivity (>99%) for hydrodeoxygenation of oxygenated aromatics under mild reaction conditions. A kinetic anal. showed that this mol./heterogeneous catalyst was an order of magnitude more active than analogous homogeneous catalysts. Characterization techniques such as XRD and solid-state NMR, in conjunction with ICP-MS, indicate that the mol. catalyst is present on the surface of SiO2 and the formation of unwanted metallic Pd nanoparticles can be avoided. Computational modeling shows the catalysts can adhere to the oxide surface through a hydrogen bonding interaction, via a Coulombic attraction between the charged mol. and the oxide surface, or through covalent bonding. Postreaction anal. of the surface-modified oxide catalysts confirmed prolonged mol. integrity of the catalyst and sustained binding of the catalyst to the oxide surface when nonpolar solvents were employed for reactions. These surface-attached mol. catalysts thus were recycled through multiple catalytic reactions.

ACS Catalysis published new progress about Binding energy. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, SDS of cas: 140-11-4.

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

Radulovic, Niko S. published the artcileLong-chain syn-1-phenylalkane-1,3-diyl diacetates, related phenylalkane derivatives, and sec-alcohols, all possessing dominantly iso-branched chain termini, and 2/3-methyl-branched fatty acids from Primula veris L. (Primulaceae) wax, Related Products of esters-buliding-blocks, the main research area is Primula veris phenylalkane derivative secondary alc branched fatty acid; 1-Phenylalkane-1,3-diones; 2-Methylalkanoic and 3-methylalkanoic acids; 3-Oxo-1-phenylalkan-1-yl acetates; Branched long-chain wax constituents; Primula veris L.; Primulaceae; sec-Alcohols; syn-1-Phenylalkane-1,3-diyl diacetates.

Herein, the results of the first study of non-flavonoid constituents of aboveground surface-wax washings of Primula veris L. (Primulaceae) are presented. Chromatog. of the washings yielded a minor fraction composed of n-, iso-, and anteiso-series of long-chained syn-1-phenylalkane-1,3-diyl diacetates, 3-oxo-1-phenylalkan-1-yl acetates, 1-phenylalkane-1,3-diones, 1-hydroxy-1-phenylalkan-3-ones, sec-alcs. (2- to 10-alkanols), and n-, iso-, anteiso-, 2-methylalkanoic and 3-methylalkanoic acids; 118 of these constituents represent up to now unreported natural compounds The structural/stereochem. elucidation was accomplished by the synthesis of authentic standards, derivatization reactions, the use of gas chromatog. retention data and detailed 1D and 2D-NMR analyses of the obtained complex chromatog. fraction. Primula veris produces unusually high amounts of branched long-chained metabolites (>60%) except for the fatty acids where the percentage of branched isomers is comparable to the ones with n-chains. Noteworthy is the fact that long-chained α- and β-Me substituted fatty acids were detected herein for the first time in the kingdom Plantae.

Phytochemistry (Elsevier) published new progress about Diketones Role: NPO (Natural Product Occurrence), PUR (Purification or Recovery), SPN (Synthetic Preparation), BIOL (Biological Study), OCCU (Occurrence), PREP (Preparation) (1-phenylalkane-1,3-dione). 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Related Products of esters-buliding-blocks.

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

Weatherhead, Robin A. published the artcileSynthesis of conformationally constrained diaminodicarboxylic acid derivatives, Category: esters-buliding-blocks, the main research area is aminodicarboxylic di cyclic acid synthesis conformation conformer crystal structure.

Functionally protected forms of three conformationally constrained diaminodicarboxylic acids were synthesized and characterized. 2,2′-Diaminospiro[3.3]heptane-2,2′-dicarboxylic acid, an analog of diaminopimelic acid, was prepared in racemic form and the structure established by X-ray crystallog. anal. of the Me ester hydrochloride. Trans-1,4-Diaminocyclohexane-1,4-dicarboxylic acid was prepared and its structure established by X-ray crystallog. anal. of the corresponding Cbz-protected Et ester. Cis- And trans-2,6-diamino-1,2,3,5,6,7-hexahydro-s-indacene-2,6-dicarboxylic acids were synthesized and the structures assigned by X-ray crystallog. anal. of the corresponding Boc-protected Et ester and Cbz-protected Et ester, resp.

Journal of Organic Chemistry published new progress about Conformation. 37942-79-3 belongs to class esters-buliding-blocks, name is Dimethyl spiro[3.3]heptane-2,6-dicarboxylate, and the molecular formula is C11H16O4, Category: esters-buliding-blocks.

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

Portnova, Svetlana V. published the artcileDensity and Viscosity of Glycolic, Lactic, and Malic Acid Esters, Synthetic Route of 623-50-7, the main research area is density kinematic viscosity aliphatic ester glycolic lactic malic acid.

Densities and viscosities were measured as a function of temperature for 12 esters of glycolic, DL-lactic, and DL-malic acids and linear chain alcs. C1-C5. The d. and kinematic viscosity were obtained using a pycnometer and a Pinkevitch capillary viscometer in a temperature range of 293.15-363.15 K with accuracies of 0.1 and 0.35%, resp. The obtained data were used for dynamic viscosity calculation It was demonstrated that the viscosity-temperature dependence of esters was described by the ASTM D341 model with an average absolute relative deviation of 1%. The temperature dependence of dynamic viscosity was fitted using the Arrhenius-like equation and Vogel-Fulcher-Tammann (VFT) model. It was found that the adjustable parameters A and B have the similar value for compounds in one homologous series. These parameters were taken as constant for each series of esters of the corresponding acids. The dynamic viscosity-temperature dependence of esters was better described by the VFT model than the Arrhenius-like equation. The capabilities of some group-additivity methods for predicting d. have been reviewed and compared with exptl. results.

Journal of Chemical & Engineering Data published new progress about Aliphatic esters Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), SPN (Synthetic Preparation), PROC (Process), PREP (Preparation). 623-50-7 belongs to class esters-buliding-blocks, name is Ethyl 2-hydroxyacetate, and the molecular formula is C4H8O3, Synthetic Route of 623-50-7.

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

Zhang, Chi published the artcileSite-Selective Cysteine-Cyclooctyne Conjugation, Computed Properties of 882847-32-7, the main research area is cysteine cyclooctyne conjugation DBCO tag peptide; bioconjugation; bioorthogonal chemistry; cysteine-cyclooctyne reaction; dibenzocyclooctyne; protein modification.

The authors report a site-selective cysteine-cyclooctyne conjugation reaction between a seven-residue peptide tag (DBCO-tag, Leu-Cys-Tyr-Pro-Trp-Val-Tyr) at the N or C terminus of a peptide or protein and various aza-dibenzocyclooctyne (DBCO) reagents. Compared to a cysteine peptide control, the DBCO-tag increases the rate of the thiol-yne reaction 220-fold, thereby enabling selective conjugation of DBCO-tag to DBCO-linked fluorescent probes, affinity tags, and cytotoxic drug mols. Fusion of DBCO-tag with the protein of interest enables regioselective cysteine modification on proteins that contain multiple endogenous cysteines; these examples include green fluorescent protein and the antibody trastuzumab. Short peptide tags can aid in accelerating bond-forming reactions that are often slow to non-existent in water.

Angewandte Chemie, International Edition published new progress about Enhanced green fluorescent proteins Role: BSU (Biological Study, Unclassified), PEP (Physical, Engineering or Chemical Process), BIOL (Biological Study), PROC (Process) (fusion protein with DCBO-tag). 882847-32-7 belongs to class esters-buliding-blocks, name is 1-(9H-Fluoren-9-yl)-3-oxo-2,7,10,13,16,19-hexaoxa-4-azadocosan-22-oic acid, and the molecular formula is C28H37NO9, Computed Properties of 882847-32-7.

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

Iborra, Agustin published the artcileSynthesis of lauryl methacrylate and poly(ethylene glycol) methyl ether methacrylate copolymers with tunable microstructure and emulsifying properties, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is lauryl methacrylate polyethylene glycol methyl ether copolymer.

In this work we study the synthesis and properties of copolymers constituted of lauryl methacrylate and poly(ethylene glycol) Me ether methacrylate monomers, prepared by atom transfer radical copolymerization in the entire composition range (with low and high monomer conversion). We propose a description of the copolymer microstructure, and evaluate the composition drift effect in the thermal and solution properties of the obtained copolymers. NMR was used to determine the chem. composition of the copolymers, while differential scanning calorimetry and themogravimetric anal. was employed to understand the thermal chracteristics. Rheol. studies were conducted to obtain the viscosity and viscoelastic properties that were correlated with thermal transitions at different temperatures Finally, dynamic light scattering (DLS) and surface tension measurements were used to evaluate the copolymer solution properties. The incorporation of an oil phase in the self-assembled aggregates was evaluated by DLS and characterized by at. force microscopy, diffusion-ordered spectroscopy NMR and nuclear Overhauser effect NMR spectroscopy. Our results suggest a longer sequence of LMA units in the copolymer chain and a drift effect in the case of high monomer conversions. A clear dependence on copolymer composition and microstructure to disperse an oil phase in water was observed We believe that these results bring valuable knowledge that advances the field of macrosurfactants as well as their potential applications in oil recovery and other industrial processes.

European Polymer Journal 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