Category: esters-buliding-blocks

Liao, Xueli published the artcileIdentification of key odorants responsible for cooked corn-like aroma of green teas made by tea cultivar Zhonghuang 1, Synthetic Route of 140-11-4, the main research area is Camellia green tea cooked corn aroma odorant responsible; Aroma recombination; Cooked corn-like aroma green tea; Dimethyl sulfide; GC-O; OAV; S-methylmethionine; Zhonghuang 1.

Fangping green tea (FPGT) produced by Zhonghuang 1 (C. sinensis var. sinensis cv. Zhonghuang 1), a new tea variety, has a classical cooked corn-like aroma, which is completely different from the green tea aroma. In order to illustrate the aroma characteristics of the green tea, the volatiles of FPGT was analyzed with gas chromatog.-mass spectrometry (GC-MS) and gas chromatog.-olfactometry (GC-O). The results showed that odor activity value (OAV) of di-Me sulfide (DMS) was 1195.21 and the odor intensity about DMS was 6.2 in FPGT. Aroma recombination experiment also confirmed the important contribution of DMS to cooked corn-like aroma. Aroma character impact (ACI) values of DMS in tea processed by Zhonghuang 1 and Fudingdabai were 72.01% and 37.86%, resp. This indicated that the high proportion of DMS was the dominant character of green tea with cooked corn-like aroma. In addition, the S-methylmethionine (SMM) content in fresh leaves of Zhonghuang 1 (0.21 mg/g) was significantly higher than that of Fudingdabai (0.16 mg/g), which was an important reason for high DMS content.

Food Research International published new progress about Camellia sinensis. 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

Zhu, Biying published the artcileAroma profile of Jinmudan tea produced using Camellia sinensis, cultivar Jinmudan using solid-phase microextraction, gas chromatography-mass spectrometry, and chemometrics, Computed Properties of 140-11-4, the main research area is Jinmudan tea Camellia aroma solid phase microextraction gas chromatog.

Jinmudan (JM) tea, produced using Camellia sinensis, cultivar JM, is popular among consumers because of its strong floral and fruity aroma. Aroma profiles of white, green, black, and oolong teas, which were obtained from JM and Tanyangcaicha (TY, control and indigenous variety), were investigated. Sensory evaluation was used to describe the quality characteristics of the tea samples. A combination of headspace solid-phase microextraction, gas chromatog.-mass spectrometry (HS-SPME/GC-MS), and chemometrics was used to extract and analyze the volatiles in the samples; 162 volatiles were identified and categorized on the basis of their chem. structures. The proportions of chem. categories differed among the teas. The same type of tea obtained from JM and TY differed significantly in concentrations and categories of volatiles. This study will improve our understanding of the profile of volatile compounds in JM teas and create a basis for investigating the biol. characteristics of JM teas.

European Food Research and Technology published new progress about Camellia sinensis. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Computed Properties of 140-11-4.

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

Dai, Qianying published the artcileInvestigating volatile compounds’ contributions to the stale odour of green tea, HPLC of Formula: 140-11-4, the main research area is Camellia volatile compound stale odor.

Summary : This study aimed to characterize the volatiles that contribute to stale odor of green tea. Volatiles were extracted using headspace solid-phase microextraction (HS-SPME) and analyzed using gas chromatog.-mass spectrometry (GC-MS) and gas chromatog.-olfactometry (GC-O). Results showed that a total of ninety-six volatiles were identified by GC-MS, in which forty-four volatiles were screened out based on Principal component anal. (PCA) and orthogonal projections to latent structures-discriminant anal. (OPLS-DA), and thirty-nine volatiles had a significant variation at the level of 0.05 by anal. of variance (ANOVA). From GC-O anal., fifty-four aromatic volatiles with strong aroma intensity (aroma intensity above 2) were perceived. Further investigation revealed that fifteen volatiles, including 1-octen-3-ol, benzyl alc., benzaldehyde, safranal, β-cyclocitral, (E,E)-3,5-octadien-2-one, (Z,E)-3,5-octadien-2-one, di-Me adipate, dihydroactinidiolide, β-ionone, α-ionone, geranyl acetone, phenylethyl alc., Me decanoate and α-terpineol were responsible for stale odor, besides the former nine compounds were only found in stored tea.

International Journal of Food Science and Technology published new progress about Camellia sinensis. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, HPLC of Formula: 140-11-4.

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

Ek, Frida published the artcileSorafenib and nitazoxanide disrupt mitochondrial function and inhibit regrowth capacity in three-dimensional models of hepatocellular and colorectal carcinoma, COA of Formula: C12H9N3O5S, the main research area is sorafenib nitazoxanide hepatocellular colorectal carcinoma three dimensional model.

Quiescent cancer cells in malignant tumors can withstand cell-cycle active treatment and cause cancer spread and recurrence. Three-dimensional (3D) cancer cell models have led to the identification of oxidative phosphorylation (OXPHOS) as a context-dependent vulnerability. The limited treatment options for advanced hepatocellular carcinoma (HCC) and colorectal carcinoma (CRC) metastatic to the liver include the multikinase inhibitors sorafenib and regorafenib. Off-target effects of sorafenib and regorafenib are related to OXPHOS inhibition; however the importance of this feature to the effect on tumor cells has not been investigated in 3D models. We began by assessing global transcriptional responses in monolayer cell cultures, then moved on to multicellular tumor spheroids (MCTS) and tumoroids generated from a CRC patient. Cells were treated with chemotherapeutics, kinase inhibitors, and the OXPHOS inhibitors. Cells grown in 3D cultures were sensitive to the OXPHOS inhibitor nitazoxanide, sorafenib, and regorafenib and resistant to other multikinase inhibitors and chemotherapeutic drugs. Furthermore, nitazoxanide and sorafenib reduced viability, regrowth potential and inhibited mitochondrial membrane potential in an additive manner at clin. relevant concentrations This study demonstrates that the OXPHOS inhibition caused by sorafenib and regorafenib parallels 3D activity and can be further investigated for new combination strategies.

Scientific Reports published new progress about Cancer recurrence. 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, COA of Formula: C12H9N3O5S.

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

Valentini, Federica published the artcileTailor-Made POLITAG-Pd0 Catalyst for the Low-Loading Mizoroki-Heck Reaction in γ-Valerolactone as a Safe Reaction Medium, Safety of Isopentyl 3-(4-methoxyphenyl)acrylate, the main research area is tailor POLITAG Pd0 catalyst Mizoroki Heck gamma valerolactone safe.

In this contribution, we have reported our study on the fine-tuned design and synthesis of new POLITAGs-Pd0 (POLymeric Ionic TAG) catalytic systems with the intention of defining highly efficient heterogeneous palladium catalysts stabilized by ionic tags able to operate at a very low loading while being fully recoverable/reusable. By varying both the support and the ratio between the metal and immobilized ionic tag, we have accessed five different heterogeneous catalytic systems that have been fully characterized (EA, XPS, TEM, and HR-TEM) to investigate their morphol. differences. The catalytic efficiency of the newly prepared POLITAGs-Pd0 materials was then tested and compared in the representative Mizoroki-Heck cross-coupling reaction, a universally investigated and widely useful process. A close correlation between the catalyst support and catalytic performances has been highlighted. The best system POLITAG-Pd0-HM features a high TOF value (26,786 h-1), affording the final products in high isolated yields by using as little as only 0.0007 mol % of Pd. Moreover, this high catalytic activity coupled with the use of γ-valerolactone (GVL) as a green reaction medium has led to the definition of a very efficient waste-minimized protocol. The newly designed catalyst has been utilized in the representative synthesis of Amiloxate, a widely used sunscreen agent, that could be prepared with negligible metal contamination and very low E-factor.

ACS Sustainable Chemistry & Engineering published new progress about Catalyst supports. 71617-10-2 belongs to class esters-buliding-blocks, name is Isopentyl 3-(4-methoxyphenyl)acrylate, and the molecular formula is C15H20O3, Safety of Isopentyl 3-(4-methoxyphenyl)acrylate.

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

Shi, Jie published the artcileCharacterization of Key Aroma Compounds in Tartary Buckwheat (Fagopyrum tataricum Gaertn.) by Means of Sensory-Directed Flavor Analysis, Recommanded Product: Hexyl 2-hydroxybenzoate, the main research area is aroma flavor Fagopyrum tartary buckwheat; aroma extract dilution analysis; aroma-active compounds; chiral analysis; sensory-directed flavor analysis; tartary buckwheat.

The key odorants of tartary buckwheat (TB) were researched by a sensory-directed flavor anal. approach for the first time. After the volatiles of TB were isolated by solvent-assisted flavor evaporation (SAFE), 49 aroma-active components with flavor dilution (FD) factors in the range of 1-2187 were identified using gas chromatog.-olfactometry-mass spectrometry (GC-O-MS) combined with aroma extract dilution anal. (AEDA). Geranylacetone, phenethyl alc., and β-damascone showed the highest FD factors of 2187. All 49 odorants were further quantitated by the internal standard curve method, and their odor activity values (OAVs) were obtained. The overall aroma of TB was successfully simulated (similarity > 98.16%) by mixing 16 odorants (OAV â‰?1) with their natural concentrations The omission tests revealed that geosmin, α-isomethylionone, α-methylionone, β-ionone, linalool, β-damascone, geranylacetone, guaiacol, Et hexanoate, geraniol, vanillin, tetrahydrolinalool, and 2,5-dimethyl-4-hydroxy-3-(2H)-furanone were the key odorants of TB. Chiral anal. showed that tetrahydrolinalool and linalool existed as racemics in the com. TB. The relative content of R-enantiomers of α-isomethylionone and α-methylionone was slightly higher than that of their S-enantiomers. The odor thresholds of R- and S-enantiomer of tetrahydrolinalool were first detected as 0.029 and 3.8μg/L in air, resp.

Journal of Agricultural and Food Chemistry published new progress about Chiral resolution. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, Recommanded Product: Hexyl 2-hydroxybenzoate.

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

Stevenson, Keisean A. J. M. published the artcileThermodynamics-based modelling of gas chromatography separations across column geometries and systems, including the prediction of peak widths, Recommanded Product: Methyl decanoate, the main research area is thermodn modeling gas chromatog separation across column geometries system; peak width prediction; retention prediction; thermodynamic modeling.

Thermodn.-based models have been demonstrated to be useful for predicting retention time and peak widths in gas chromatog. and two-dimensional gas chromatog. separations However, the collection of data to train the models can be time consuming, which lessens the practical utility of the method. In this contribution, a method for obtaining thermodn.-based data to predict peak widths in temperature-programmed gas chromatog. is presented. Exptl. work to collect data for peak width prediction is identical to that required to collect data for retention time prediction using approaches that we have presented previously. Using this combined approach, chromatograms including retention times and peak widths are predicted with very high accuracy. Typical errors in retention time are < 0.5%, while errors in peak width are typically < 5% as demonstrated using polycycic aromatic hydrocarbons and a mixture containing compounds with aldehyde, ketone, alkene, alkane, alc., and ester functionalities. Journal of Separation Science published new progress about Gas chromatography. 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

Khatun, Habiba published the artcileCharacterization of freeze-dried, oven-dried and blanched house crickets (Acheta domesticus) and Jamaican field crickets (Gryllus assimilis) by means of their physicochemical properties and volatile compounds, Computed Properties of 110-42-9, the main research area is volatile compound Achete Gryllus freeze oven drying blanching.

Edible insects are repeatedly being considered as underutilized food candidate due to their high nutritional value. Although frequent acceptance of whole insects to consumer is still challenging, incorporation of insects in food as powder or paste has been suggested to increase their acceptability. Hence, Acheta domesticus and Gryllus assimilis were subjected to freeze drying, oven drying, and blanching to acquire a clear insight on the impact of the processing methods on the nutritional and phys. properties of both species. Result showed that these three methods had limited effects on the proximate composition, fatty acid and amino acid profile but had significant impact on other parameters for both species. Vitamin B12 in A. domesticus did not change but G. assimilis changed due to the treatment. Freeze drying showed better lightness (L* value) and lower browning index for both cricket species. Oven drying and blanching resulted in lower lipid oxidation values than freeze drying for both cricket species; though lipid oxidation was in all cases well below the rejection limit. Esters were the predominant group of volatile compound in freeze and oven-dried cricket while least amount of volatiles were found in blanched cricket. The volatiles resulted from fatty acid oxidation were higher in freeze-dried crickets, while Maillard reaction products were found in oven-dried samples. Although freeze drying showed higher color quality, oven drying exerted superior effect in terms of nutritional and flavor characteristics followed by blanching treatment.

European Food Research and Technology published new progress about Acheta domesticus. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Computed Properties of 110-42-9.

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

Khatun, Habiba published the artcileCharacterization of freeze-dried, oven-dried and blanched house crickets (Acheta domesticus) and Jamaican field crickets (Gryllus assimilis) by means of their physicochemical properties and volatile compounds, Application In Synthesis of 111-11-5, the main research area is volatile compound Achete Gryllus freeze oven drying blanching.

Edible insects are repeatedly being considered as underutilized food candidate due to their high nutritional value. Although frequent acceptance of whole insects to consumer is still challenging, incorporation of insects in food as powder or paste has been suggested to increase their acceptability. Hence, Acheta domesticus and Gryllus assimilis were subjected to freeze drying, oven drying, and blanching to acquire a clear insight on the impact of the processing methods on the nutritional and phys. properties of both species. Result showed that these three methods had limited effects on the proximate composition, fatty acid and amino acid profile but had significant impact on other parameters for both species. Vitamin B12 in A. domesticus did not change but G. assimilis changed due to the treatment. Freeze drying showed better lightness (L* value) and lower browning index for both cricket species. Oven drying and blanching resulted in lower lipid oxidation values than freeze drying for both cricket species; though lipid oxidation was in all cases well below the rejection limit. Esters were the predominant group of volatile compound in freeze and oven-dried cricket while least amount of volatiles were found in blanched cricket. The volatiles resulted from fatty acid oxidation were higher in freeze-dried crickets, while Maillard reaction products were found in oven-dried samples. Although freeze drying showed higher color quality, oven drying exerted superior effect in terms of nutritional and flavor characteristics followed by blanching treatment.

European Food Research and Technology published new progress about Acheta domesticus. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Application In Synthesis of 111-11-5.

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

Reyes, Laura published the artcileAutocatalyzed and heterogeneously catalyzed esterification kinetics of glycolic acid with ethanol, Synthetic Route of 623-50-7, the main research area is glycolic acid ethanol amberlyst catalyst esterification kinetics.

The chem. equilibrium and reaction kinetics in homogeneously and heterogeneously catalyzed systems were investigated for the reversible esterification reaction of glycolic acid with ethanol. In a first approach, the thermodn. equilibrium of the reaction was established for temperatures between 50°C and 75°C. To differentiate catalytic from homogeneous contribution, the esterification was first studied without a catalyst and the data obtained were then used to model the autocatalyzed homogeneous reaction kinetics. The impact of different com. solid catalysts such as zeolites, oxides and ion exchange resins on the esterification reaction was also investigated. For the latter, the amount of total acid sites was quantified in order to correlate this parameter to the reaction rate and glycolic acid conversion. Finally, the effects of catalyst loading, temperature, presence of water and recyclability were examined for the most efficient catalyst, Amberlyst 70. Moreover, a kinetic adjustment of the exptl. results was carried out by fitting the data to a pseudo-homogeneous model and comparing to adsorption-based models.

Reaction Chemistry & Engineering published new progress about Activation energy. 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