Tag: M.W=150-200

Balcerek, Maria published the artcileEffect of filtration on elimination of turbidity and changes in volatile compounds concentrations in plum distillates, Related Products of esters-buliding-blocks, the main research area is Prunus distillate filtration turbidity volatile compound; Cold storage; Fatty acid esters; Fruit distillate; Turbidity; Volatile compounds.

The purpose of this study was to investigate the effect of alc. strength by volume (ASV) and storage conditions on turbidity in plum brandies. Different types of filter sheet were also tested for their effects on turbidity, as well as on the chem. composition and organoleptic characteristics of the distillates. The raw materials used were two plum distillates with initial ASVs of 76.77% volume/volume and 81.92% volume/volume The distillates were diluted to alc. contents of 37.5%, 40% and 50% volume/volume and stored under various conditions for 64 days. Filtration was performed using two depth filter sheets, with nominal retention rates of 0.40-0.48μm and 0.80μm, or with an activated carbon-based filter sheet. The lowest turbidity was observed in samples stored at ambient temperature with an ASV of 50% volume/volume Reducing the alc. content and storage temperature caused turbidity to increase. Samples prepared from distillate with an initial alc. content of 76.77% volume/volume were characterized by significantly higher turbidity than those produced from spirit with an initial ASV of 81.92% volume/volume Lowering the storage temperature resulted in a larger decrease in the concentration of volatile compounds after filtration. Use of an activated carbon filter sheet caused the greatest decrease in the majority of volatiles. Use of a filter sheet with a nominal retention rate of 0.80μm led to the greatest improvement in the organoleptics of the tested plum distillates.

Journal of Food Science and Technology (New Delhi, India) published new progress about Esters Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Related Products of esters-buliding-blocks.

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

Ji, Xiaoyue published the artcileInvestigation of the volatile components in commercial sufu (Chinese fermented soybean curd) based on HS-SPME/GC-MS combined with multivariate statistical analysis, Application In Synthesis of 106-32-1, the main research area is Chinese fermented soybean curd volatile component HSSPME GCMS.

Volatile flavor substances in com. sufu samples of different brands were investigated by headspace solid-phase microextraction (HS-SPME) coupled with gas chromatog.-mass spectrometry (GC-MS). Principal component anal. and cluster anal. of volatile substances for evaluating and distinguishing between nine com. sufu samples were carried out. The results were that a total of 36-six volatiles were identified successfully in nine different brands of sufu, including 7 alcs., 22 esters, and 6 other organic compounds Sufu can be classified into five categories by cluster anal. according to the types and contents of volatiles, and it was determined that the predominant source of difference among volatiles was the difference of esters. Meanwhile, the principal component score plot described the differences and classifications of sufu samples. It was noted that types and contents of volatiles can reflect the sufu taste and analyzing the volatile organic components in sufu provides us with valuable information. HS-SPME-GC/MS combined with multivariate statistical anal. was developed to comprehensively compare volatile components in nine brands of com. sufu with large market share in China. The anal. results indicated that there were obvious differences in the types and contents of volatile components. In this study, the difference in volatile components between the nine brands of sufu was studied and the source of some certain chem. substances were traced to explain for the special sufu flavor. This feasible method may be used as a reference for further research on the flavor of sufu and may help formulators, who are trying to improve the taste and quality of food products.

Journal of Food Processing and Preservation published new progress about Esters Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Application In Synthesis of 106-32-1.

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

Tufariello, M. published the artcileSelection of an autochthonous yeast starter culture for industrial production of Primitivo “”Gioia del Colle”” PDO/DOC in Apulia (Southern Italy), Quality Control of 106-32-1, the main research area is autochthonous yeast starter culture primitivo PDO DOC.

The aim of the present study was to isolate and characterize yeast strains as good candidates for driving the industrial fermentation process, from natural must fermentations of “”Primitivo”” grape cultivar, grown in the PDO/DOC “”Gioia del Colle”” (Apulia, Southern Italy). The selection protocol was based on parameters such as low production of acetic acid and hydrogen sulfide, complete sugar consumption during fermentation, significant production of some classes of volatile mols. responsible for wine aroma. Three Saccharomyces cerevisiae strains, named ITEM14088, ITEM14090 and ITEM14093, successfully dominated the fermentation process and contributed to increase organoleptic quality of the produced wines. The best performing strain, namely ITEM14093, was used as fermentation starter for three different industrial vinifications. The wines obtained were characterized by high levels of esters, associated to fruity nuances, as well as of alcs. responsible for vinous, sweet and floral notes. Furthermore, from a sensory point of view, all wines were pos. judged, being characterized by frankness, gustatory persistence and intensity, good balance and body wine.

LWT–Food Science and Technology published new progress about Esters Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Quality Control of 106-32-1.

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

Ashor, Almabrok A. published the artcileOptimization of modifier deposition on the alumina surface to enhance mechanical properties and cavitation resistance, Name: Dimethyl itaconate, the publication is Polymer Bulletin (Heidelberg, Germany) (2020), 77(7), 3603-3620, database is CAplus.

Composites based on poly(Me methacrylate), di-Me itaconate matrix and alumina particles were prepared Ferrous oxide-doped alumina particles (Al₂O₃ Fe) and com. alumina nanoparticles (Al₂O₃ n) modified with (3-aminopropyl)trimethoxysilane (AM) and Me esters of linseed oil fatty acids (biodiesel-BD) were used as reinforcement. The mech. properties of the prepared composites, containing 1, 3 and 5 weight% of surface-modified alumina particles, are compared to a neat polymer matrix. The particles were characterized by single-beam Fourier transform IR spectroscopy, thermogravimetry and differential scanning calorimetry. The mech. properties of the composites were determined by micro-Vickers hardness and impact testing. The morphol. of the surface of the composites exposed to cavitation was observed through a field emission scanning electron microscope. AFM anal. was used to compare surface features seen using the SEM and to interpret the surface degradation properties. The hardness, cavitation resistance and high-impact energy resistance of the composites are better in the case of AM surface modification of alumina fillers, but biodiesel modified particles have comparable mech. properties and a stabilized Al-O-Si bond that could be important when a composite is exposed to humidity or a wet environment.

Polymer Bulletin (Heidelberg, Germany) published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C7H10O4, Name: Dimethyl itaconate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zhu, Di published the artcileTerthiophene Derivative-Based Photoinitiating Systems for Free Radical and Cationic Polymerization under Blue LEDs, HPLC of Formula: 10287-53-3, the publication is Industrial & Engineering Chemistry Research (2021), 60(24), 8733-8742, database is CAplus.

Terthiophene derivatives were prepared and utilized as photoinitiators of photopolymerization reactions upon exposure to LEDs (410 and 445 nm). The photochem. mechanisms of the terthiophene-based photoinitiating systems were investigated and confirmed by steady-state photolysis, fluorescence quenching, and ESR spin-trapping techniques. The photoinitiation ability of terthiophene derivatives in combination with the iodonium salt and optionally with a tertiary amine in the free radical polymerization of multifunctional acrylates and cationic polymerization of epoxides under mild light irradiation was investigated. Exceptionally, a sodium salt form of a terthiophene derivative presented exceeding water solubility and admirable efficiency in rapid hydrogel formation from the 2-hydroxy Et acrylate and water blend. The storage stability of the effective photoinitiating systems in the formulations was also studied under moderate conditions.

Industrial & Engineering Chemistry Research published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C12H15ClO3, HPLC of Formula: 10287-53-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wood, William F. published the artcileVolatile compounds in shoulder gland secretions of male flying foxes, genus Pteropus (Pteropodidae, Chiroptera), Recommanded Product: 3-Methylbut-2-en-1-yl benzoate, the publication is Zeitschrift fuer Naturforschung, C: Journal of Biosciences (2005), 60(9/10), 779-784, database is CAplus and MEDLINE.

The shoulder gland secretions of captive males of the Indian flying fox (Pteropus giganteus), the little golden-mantled flying fox (P. pumilus), the island flying fox (P. hypomelanus), and the large flying fox (P. vampyrus) were examined by gas chromatog.-mass spectrometry. Sixty-five compounds, including hydrocarbons, carboxylic acids, alcs., aldehydes, ketones, esters, and amides, were identified among the four species. Many of these compounds, such as squalene, cholesterol, and C₅-C₁₆ straight- and branched-chain carboxylic acids, are typical of tetrapod epidermal products. Aldehydes, which were detected in all four Pteropus species, and some straight- and branched-chain ketones, which were detected in P. hypomelanus and P. pumilus, are known from other mammalian skin glands. Acetophenone, 4-acetoxyacetophenone, and 4-hydroxyacetophenone were observed in P. pumilus; the last compound comprised 37.1% of the total ion current. 2,3-Butanediol, a prominent component (5.2-19.3%) in the secretions of P. giganteus, P. hypomelanus, and P. pumilus, and C₁₀ and C₁₂ iso-Pr esters and C₁₀-C₁₄ 1-methylbutyl esters, observed in P. hypomelanus and P. vampyrus, have not previously been reported from vertebrates. α-Methyl-4-methoxybenzyl alc. and dihydro-5-phenyl-2(3H)-furanone, from P. giganteus and P. pumilus, are new natural products. 1-Chloro-3-methyl-2-butene, another new natural product, and five C₅ compounds exhibiting a similar isoprenoid structure were observed in P. giganteus. Striking contrasts were observed in the chem. profiles of the species we examined, with even general chem. classes differentially represented among them.

Zeitschrift fuer Naturforschung, C: Journal of Biosciences published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C6H3ClN4O2, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Huang, Yaling published the artcileVariation of Volatile Compounds and Corresponding Aroma Profiles in Chinese Steamed Bread by Various Yeast Species Fermented at Different Times, Safety of Methyl 3-phenyl-2-propenoate, the publication is Journal of Agricultural and Food Chemistry (2022), 70(12), 3795-3806, database is CAplus and MEDLINE.

To control the fermentation process of yeast-Chinese steamed bread (CSB), the volatile compounds and odor profiles of yeast-CSBs during fermentation were comprehensively investigated by sensory evaluation, gas chromatog.-mass spectrometry, gas chromatog.-olfactometry (GC-O), and odor activity value (OAV). Eight sensory attributes were established, and quant. descriptive anal. results showed that CF1303-CSB had intense sweet and sweet aftertaste attributes, CF1318-CSB was characterized by milky, wheaty, and yeasty attributes, while CL10138-CSB presented distinct sour, winy, and floury attributes. A total of 41 key aroma-active compounds were detected, and phenylethyl alc. was the most potent aroma compound with a flavor dilution (FD) of 1024. CF1303-CSB, CF1318-CSB, and CL10138-CSB contained 24, 22, and 21 key aroma compounds, resp., based on the OAV. These key aroma compounds can be used as the potential markers to monitor the yeast-CSBs during the fermentation process. Five compounds, including β-myrcene, 2-phenoxyethanol, Me cinnamate, guaiacol, and o-cresol, were first identified in CSB. These results provide theor. basis for processing and quality control of yeast-CSBs.

Journal of Agricultural and Food Chemistry published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Safety of Methyl 3-phenyl-2-propenoate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Clarke, Joshua A. published the artcileBase-Catalyzed Hydrosilylation of Nitriles to Amines and Esters to Alcohols, Synthetic Route of 10287-53-3, the publication is European Journal of Organic Chemistry (2021), 2021(31), 4434-4439, database is CAplus.

Base-catalyzed hydrosilylation of nitriles to amines and esters to silylated alcs. is reported. This protocol tolerates electron-rich and electron-neutral olefins and works in the presence of basic functional groups (e. g. tertiary amines) but fails for acidic substrates, such as phenols and NH anilines. This catalytic system does not tolerate carbonyl groups, such as aldehydes, ketones, esters and carbamides, which are reduced to corresponding alcs. and amines. With the exact amount of silane, esters can be selectively reduced in the presence of nitriles, but the selectivity drops for the pairs ester/carboxamide and carboxamide/nitrile. Through competition experiments, the following preference in functional group reactivity was determined: ester > carboxamide > nitrile.

European Journal of Organic Chemistry published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Synthetic Route of 10287-53-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Gao, Yongzhi published the artcileBisubstrate Inhibitors of Nicotinamide N-Methyltransferase (NNMT) with Enhanced Activity, Name: 3-(Methoxycarbonyl)benzoic acid, the publication is Journal of Medicinal Chemistry (2019), 62(14), 6597-6614, database is CAplus and MEDLINE.

Nicotinamide N-methyltransferase (NNMT) catalyzes the methylation of nicotinamide to form N-methylnicotinamide. Overexpression of NNMT is associated with a variety of diseases, including a number of cancers and metabolic disorders, suggesting a role for NNMT as a potential therapeutic target. By structural modification of a lead NNMT inhibitor previously developed in our group, we prepared a diverse library of inhibitors to probe the different regions of the enzyme’s active site. This investigation revealed that incorporation of a naphthalene moiety, intended to bind the hydrophobic nicotinamide binding pocket via π-π stacking interactions, significantly increases the activity of bisubstrate-like NNMT inhibitors (half-maximal inhibitory concentration 1.41 μM). These findings are further supported by isothermal titration calorimetry binding assays as well as modeling studies. The most active NNMT inhibitor identified in the present study demonstrated a dose-dependent inhibitory effect on the cell proliferation of the HSC-2 human oral cancer cell line.

Journal of Medicinal Chemistry published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C9H8O4, Name: 3-(Methoxycarbonyl)benzoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Green, Samantha A. published the artcileIron-Nickel Dual-Catalysis: A New Engine for Olefin Functionalization and the Formation of Quaternary Centers, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate, the publication is Journal of the American Chemical Society (2018), 140(36), 11317-11324, database is CAplus and MEDLINE.

Alkene hydroarylation forms carbon-carbon bonds between two foundational building blocks of organic chem.: olefins and aromatic rings. In the absence of electronic bias or directing groups, only the Friedel-Crafts reaction allows arenes to engage alkenes with Markovnikov selectivity to generate quaternary carbons. However, the intermediacy of carbocations precludes the use of electron-deficient arenes, including Lewis basic heterocycles. Here we report a highly Markovnikov-selective, dual-catalytic olefin hydroarylation that tolerates arenes and heteroarenes of any electronic character. Hydrogen atom transfer controls the formation of branched products and arene halogenation specifies attachment points on the aromatic ring. Mono-, di-, tri-, and tetra-substituted alkenes yield Markovnikov products including quaternary carbons within nonstrained rings.

Journal of the American Chemical Society published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics