Category: esters-buliding-blocks

Cheng, Ming published the artcilePalladium-Catalyzed Carbene Migratory Insertion/Carbonylation Cascade Reaction: Synthesis of 2-Indolones with a C3 All-Carbon Quaternary Center, Application In Synthesis of 583-04-0, the main research area is indolone preparation; amino aryl diazo ester allyl carboxylate carbon monoxide; tandem carbene migratory insertion carbonylation.

An attractive palladium-catalyzed three-component reaction of ortho-amino aryl diazo esters, allyl carboxylates, and carbon monoxide (CO) has been developed. This catalytic system rendered domino carbene migratory insertion and carbonylation. Remarkably, 2-indolones with a C3 all-carbon quaternary center can be selectively obtained in good to excellent yields via one-pot synthesis, in which two different C-C bonds and one C-N bond were formed in a straightforward manner.

Organic Letters published new progress about Carbonylation. 583-04-0 belongs to class esters-buliding-blocks, name is Allyl benzoate, and the molecular formula is C10H10O2, Application In Synthesis of 583-04-0.

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

Facanha, Rafaela Vieira published the artcileCombined application of ethylene and 1-methylcyclopropene on ripening and volatile compound production of ‘Golden’ papaya, Safety of Methyl octanoate, the main research area is papaya ethylene methylcyclopropene ripening volatile compound.

Papaya (Carica papaya L.) fruit are consumed worldwide, but they are highly perishable. The effects of the application of 1-methylcyclopropene (1-MCP) with and without ethylene on ‘Golden’ papaya ripening and production of volatile compounds responsible for aroma. Fruit were treated with 2.5 μl L-1 ethylene and/or 100 nL L-1 of 1-MCP for 12 h as follows: I) control, II) ethylene, III) 1-MCP, IV) ethylene + 1-MCP (simultaneous), V) ethylene followed by application of 1-MCP at a 12 h interval and VI) ethylene + 1-MCP without any interval. Pulp firmness, skin color, skin chlorophyll content, skin and pulp carotenoids, ethylene production, respiratory activity, internal ethylene concentration (IEC), pectin Me esterase (PME) activity, 1-carboxylic acid-1-aminocyclopropane oxidase (ACC oxidase) activity and volatile compounds were measured. Fruit were stored at 22 °C, with anal. of volatile compounds performed until day 8 and all others until day 6. Fruit treated with only 1-MCP developed rubberized pulp. Fruit treated simultaneously with ethylene and 1-MCP reached desirable firmness for consumption by day 6. Co-application of 1-MCP + ethylene promoted chlorophyll degradation A consistent increase in ethylene production in 1-MCP-treated fruit above those observed in control fruit and in fruit treated with ethylene only was observed In relation to volatile compounds, linalool and its oxides were affected less by 1-MCP treatment, with or without ethylene, on days 2 and 6, and did not affect fruit flavor.

Postharvest Biology and Technology published new progress about Carica papaya. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Safety of Methyl octanoate.

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

Jiang, Bian published the artcileComparative proteomic analysis provides novel insights into the regulation mechanism underlying papaya (Carica papaya L.) exocarp during fruit ripening process, Formula: C11H22O2, the main research area is Carica exocarp fruit ripening proteomics fatty acid metabolsim; Differential expressed protein; Fatty acid metabolism; Fruit; Hormones; Papaya; Ripening.

Background: Papaya (Carica papaya L.) is a popular climacteric fruit, undergoing various physico-chem. changes during ripening. Although papaya is widely cultivated and consumed, few studies on the changes in metabolism during its ripening process at the proteasome level have been performed. Using a newly developed TMT-LCMS anal., proteomes of papaya fruit at different ripening stages were investigated. Results: In total, 3220 proteins were identified, of which 2818 proteins were quantified. The differential accumulated proteins (DAPs) exhibited various biol. functions and diverse subcellular localizations. The KEGG enrichment anal. showed that various metabolic pathways were significantly altered, particularly in flavonoid and fatty acid metabolisms The up-regulation of several flavonoid biosynthesis-related proteins may provide more raw materials for pigment biosynthesis, accelerating the color variation of papaya fruit. Variations in the fatty acid metabolism- and cell wall degradation-related proteins were investigated during the ripening process. Furthermore, the contents of several important fatty acids were determined, and increased unsaturated fatty acids may be associated with papaya fruit volatile formation. Conclusions: Our data may give an intrinsic explanation of the variations in metabolism during the ripening process of papaya fruit.

BMC Plant Biology published new progress about Carica papaya. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Formula: C11H22O2.

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

Peralta-Ruiz, Yeimmy published the artcileColletotrichum gloesporioides inhibition using chitosan-Ruta graveolens L essential oil coatings: Studies in vitro and in situ on Carica papaya fruit, Recommanded Product: Benzyl acetate, the main research area is Colletotrichum Carica Ruta chitosan essential oil coating inhibition; Decay index; Edible coating; Hyphae; Maturation fruit; Molds; Morphological alterations; Postharvest pathogen.

In this study we assessed the efficacy of chitosan (CHI) (2%) emulsion added with Ruta graveolens L. essential oil (REO) at different concentrations (0.5%, 1.0% and 1.5%) to control C. gloesporioides grows both “”in situ”” and “”in vitro”” in papaya Maradol (Carica papaya L.). In vitro studies showed a decrease on fungal growth (mycelia diameter) with the increase of REO concentration, while 0.5% of REO induce a reduction of 56.42%, REO at 1.0% and 1.5% induced a reduction of 97%. Microscopic anal. showed irreversible deleterious morphol. and ultrastructural alterations as well as changes in conidia morphol., and conidia germination inhibition up to 90%. Among the most abundant REO constituents, 2-Nonanol showed strong antifungal activity followed by 2-Undecanone, Benzyl acetate, 2-Nonanone, 2-Tridecanone and 2-Dodecanone. Studies “”in situ”” on papaya fruit during 12 days at 20°C, showed a reduction of the C. gloesporioides lesion expansion by 50% using CHI-REO 0.5% emulsions and by 100% with treatments of CHI-REO 1.0 and 1.5%, in addition the emulsions were efficacious to reduce the fruit surface microbiota. On the other hand, physicochem. anal. of the papaya fruits demonstrated that CHI-REO emulsions treatment delayed papaya ripening without affecting the organoleptic characteristics. All these results demonstrated for the first time the application of coatings CHI-REO as a postharvest treatment for the control of anthracnose on papaya fruit.

International Journal of Food Microbiology published new progress about Carica papaya. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Recommanded Product: Benzyl acetate.

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

Hao, Ruijie published the artcileIdentification and specific expression patterns in flower organs of ABCG genes related to floral scent from Prunus mume, SDS of cas: 140-11-4, the main research area is Prunus flower ABCG gene expression.

Prunus mume has a unique floral scent feature that can volatilize a large amount of benzyl acetate into the air during flowering. At present, the efficient volatilization mechanism of P. mume floral scent components is still unclear. The volatilization of the key aromatic components in P. mume Caizhi Wufen was explored in different parts of flowers. Our results showed that filaments are the key fragrance-releasing parts of benzyl acetate. Moreover, the volatilization rates of diverse aromatic components were different in several parts. We also identified 130 ABC genes from P. mume, which were divided into eight subfamilies. Among the ABC genes, 55 were PmABCGs, including 24 half-size mol. transporters (white-brown complex, WBC) located on the cell membrane. Combined with RNA sequencing (RNA-seq) anal., most of the ABCG subfamily genes were specifically expressed in flowers. Importantly, they were also WBC genes and expressed high in filaments. Correlation anal. of volatilization rate and the genes expression of PmABCG showed that the volatilization of benzaldehyde and benzyl alc. were highly correlated with PmABCG2, 18, 26, and that of benzyl acetate was highly correlated with PmABCG9, 13 and 23. Therefore, the current study would provide a valuable guide for elucidating the transmembrane transport mechanism of benzenoid volatiles and study further a biol. function of different fragrance-releasing parts of flowers.

Scientia Horticulturae (Amsterdam, Netherlands) published new progress about Cell membrane. 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

Kim, Sang-Soon published the artcileResistance of Escherichia coli O157:H7 ATCC 35150 to ohmic heating as influenced by growth temperature and sodium chloride concentration in salsa, Formula: C23H46O2, the main research area is salsa sodium chloride growth temperature ohmic heating Escherichia.

Salsa is a liquid-solid food containing jalapenõ and serrano peppers, which result in multistate outbreak in 2008. Storage temperature and sodium chloride (NaCl) concentration of salsa vary depending on the climate, season, and type of product. In this regard, effect of growth conditions, namely, low temperature (15 °C) or NaCl concentration (4.5%) on the resistance of Escherichia coli O157:H7 ATCC 35150 to ohmic heating was identified in this study. Cells of E. coli O157:H7 ATCC 35150 grown under different growth conditions was inoculated into prepared salsa sample, and then subjected to ohmic heating. Mechanisms of resistance acquisition were identified by transcriptional responses, membrane fatty acid changes and confirmed with propidium iodide (PI) uptake values. Resistance of the pathogen to ohmic heating decreased when growth temperature decreased from 37 °C to 15 °C while increased resistance was observed for this pathogen when grown with 4.5% NaCl. Several heat stress related genes such as dnaK, rpoH, grpE, groES, htpG, and htpX were up-regulated (â‰? fold change) as growth temperature decreasedwhile groEL, dnaK, rpoH were up-regulated when grown with high NaCl concentration in the present study. The ratio of unsaturated fatty acids (USFA) to saturated fatty acids (SFA) of pathogen increased slightly (+0.16) or significantly (+0.79) with increasing NaCl concentration or decreasing temperature, resp. These results indicate that the cell membrane of the pathogen grown at low temperature was more susceptible to heat than when grown under optimal conditions or high NaCl concentration Cell membrane damage measured by PI uptake values of the pathogen grown with high NaCl concentration were not significantly different from those of the control (p > 0.05), while the values were significantly higher for the pathogen grown at low temperature and subjected to ohmic heating (p < 0.05). Based on these results we suggest that resistance of the pathogen grown at low temperature to ohmic heating decreased because of dominant cell membrane damage compared to induced heat stress related genes. The cell membrane damage was dominant by means of an increased ratio of USFA to SFA. On the other hand, pathogen resistance increased when grown in medium of high NaCl concentration because of induced heat stress related genes. Food Control published new progress about Cell membrane. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Formula: C23H46O2.

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

Mancuso, Raffaella published the artcileSynthesis, computational evaluation and pharmacological assessment of acetylsalicylic esters as anti-inflammatory agents, Safety of Hexyl 2-hydroxybenzoate, the main research area is aspirin acetylsalicylic ester antiinflammatory toxicity.

A convenient approach to the synthesis of alkyl esters of aspirin (ASA-OR) has been developed. The synthesis of ASA-OR has been realized in two steps: (1) direct esterification of salicylic acid with alcs. in the presence of dicyclohexylcarbodiimide to give alkyl salicylates (SAL-OR); (2) acetylation of SAL-OR with acetyl chloride to yield ASA-OR. Mol. mechanics simulations, performed to calculate the kinetic radii of several ASA-OR, indicated that the pentyl and hexyl acetylsalicylates possess the best properties to cross cell membranes. The in vitro biol. tests demonstrate their anti-inflammatory activity, superimposable to that of aspirin. The results of our study suggest that ASA-OR may be used as anti-inflammatory drugs for topical application.

Medicinal Chemistry Research published new progress about Cell membrane. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, Safety of Hexyl 2-hydroxybenzoate.

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

Prabhu, C. published the artcileCharacterisation and assessment of physicochemical properties of grapeseed methyl ester using predictive correlations and ASTM standards for CI engine application, Category: esters-buliding-blocks, the main research area is grape seed methyl ester physicochem property CI engine application.

In the present work, a detailed investigation of the physio-chem. characteristics of grapeseed Me ester (GSME) obtained from winery biomass waste has been carried out to evaluate its suitability as an energy alternate, for CI engines. GSME was subjected to Gas chromatog. and mass spectrometry anal. from which fatty acids compositions were determined followed by other interpretations such as carbon number, number of double bonds, etc. Two different predictive correlations were identified from the literature for predicting the properties that are considered important, for using GSME as a fuel. The predicted properties of GSME are compared with the exptl. results obtained through standard ASTM procedures, for diesel, neat grapeseed oil (GSO) and GSME, resp. Further, the influence of the structural and compositional characteristics of GSME on the physicochem. properties like d., kinematic viscosity, lower calorific value, etc. has been evaluated and found to be closer to diesel.

Nature, Environment and Pollution Technology published new progress about Cetane number. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Category: esters-buliding-blocks.

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

Kong, Jun published the artcileChemical Kinetics Study on Combustion of Ethanol/biodiesel/n-heptane, Recommanded Product: Methyl decanoate, the main research area is methyl decanoate n heptane ethanol production numerical simulation.

Me decanoate (MD), methyl-9-decanoate (MD9D), and n-heptane (H) as alternative blends of biodiesel (B) were used to build a detailed chem. kinetic mechanism containing 3,324 components and 11,053 elementary reactions. This condition verifies that the ignition delay time of the detailed mechanism in the experiment conditions is reasonable. MD and MD9D will produce methyl-2-palmitate (MP2D) and finally be dehydrogenated as CH2O. Furthermore, R4 (O + H2O→OH + OH) and R228 (CH2CHO + O2→CH2O + CO + OH) are the key reactions, which will influence the ignition delay and heat release. According to the simulation result, the rate of BH (the volume ratio of the biodiesel/n-heptane mixture is fixed at 20%/80%) in constant volume bomb (Cetane Ignition Delay 510, CID 510) is the highest. However, with the development of ethanol, the rates decreased. The reactors of BHE5 (BHE5 refers to a blend of 5% ethanol and 95% biodiesel/n-heptane) have the highest rate among the ethanol blends. In addition, the reaction rate of the intermediate substance of ketohydroperoxide (KHP) in a modified cooperative fuel research engine (CFR) during combustion decreased with ethanol addition However, the KHP rate of BHE15 (BHE15 refers to a blend of 15% ethanol and 85% biodiesel/n-heptane) and BHE20 (BHE20 refers to a blend of 20% ethanol and 80% biodiesel/n-heptane) is similar, causing the closed onset of low-temperature heat release. The rate of CH2O and MP2D of BH is the highest over the others in CID 510. The rate of CH2O and MP2D of BHE5 is lower than that of BHE10 (BHE10 refers to a blend of 10% ethanol and 90% biodiesel/n-heptane), BHE15, and BHE20.

Renewable Energy published new progress about Cetane number. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Recommanded Product: Methyl decanoate.

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

Fan, Mengjiao published the artcileSwitching production of γ-valerolactone and 1,4-pentanediol from ethyl levulinate via tailoring alkaline sites of CuMg catalyst and hydrogen solubility in reaction medium, Computed Properties of 539-88-8, the main research area is pentanediol gamma valerolactone production ethyl levulinate copper magnesium catalyst.

γ-Valerolactone (GVL) and 1,4-pentanediol (1,4-PeD) are the biomass-derived chems. with the tunable functionalities, serving as the platform for synthesis other value-added product. In this study, we have demonstrated that the production of GVL and 1,4-PeD from Et levulinate (EL), a product from alcoholysis of biomass, could be switched flexibly via tailoring the copper content and abundance of the basic sites in the CuMg catalyst and the reaction medium, achieving the yields up to 99% and 97.7% under optimal exptl. condition. The production of GVL was favored over the CuMg catalyst with the high Cu content, while the abundant basic sites in the CuMg catalyst were the key for further opening of the furan ring in GVL to form 1,4-PeD. Furthermore, the alc. solvent especially isopropanol with the higher hydrogen solubility also facilitated the production of 1,4-PeD. Water as the reaction medium induced significant sintering of Cu in CuMg catalyst, while the alc. solvent could effectively suppress the aggregation of copper species, maintaining the high catalytic stability.

Molecular Catalysis published new progress about Chemisorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Computed Properties of 539-88-8.

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