Month: December 2022

Patias, Georgios published the artcileControlled synthesis of methacrylate and acrylate diblock copolymers via end-capping using CCTP and FRP, Related Products of esters-buliding-blocks, the main research area is methacrylate acrylate diblock copolymer catalytic chain transfer polymerization.

Scalable methods of producing functional materials is of importance. Herein, we report the use of free radical copolymerization of ω-unsaturated methacrylic macromonomers, as derived from catalytic chain transfer polymerization (CCTP), with acrylic monomers in solution leading to block copolymers by varying the nature of the macromonomer. We demonstrate the effect that varying the mol. weight and ester side chain length of macromonomer from CCTP, has on the polymerization leading to either graft or diblock copolymers. DOSY NMR, MALDI-ToF/ToF MS has allowed for the exploration of the extent to which varying the concentration of macromonomer has on the products formed. Importantly, during the successful synthesis of acrylic and methacrylic diblock copolymers with broad dispersities of each block, full consumption of the macromonomers was observed

Polymer Chemistry published new progress about Polymers, graft Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Related Products of esters-buliding-blocks.

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

Zhang, Tengxun published the artcileA comparative analysis of floral scent compounds in intraspecific cultivars of Prunus mume with different corolla colours, Product Details of C9H10O2, the main research area is Prunus floral volatile compound; HS-SPME-GC-MS; Prunus mume; floral scent; intraspecific cultivars; phenylpropanoids/benzenoids; volatile compounds.

Prunus mume is the only fragrant flowering species of Prunus. According to the previous studies, benzyl acetate and eugenol dominate its floral scent. However, the diversity of its floral scents remains to be elucidated. In this work, the floral volatiles emitted from eight intraspecific cultivars of P. mume with white, pink and red flowers, were collected and analyzed using headspace solid-phase microextraction combined with gas chromatograms-mass spectrometry (HS-SPME-GC-MS). In total, 31 volatile compounds were identified, in which phenylpropanoids/benzenoids accounted for over 95% of the total emission amounts Surprisingly, except for benzyl acetate and eugenol, several novel components, such as benzyl alc., cinnamyl acohol, cinnamy acetate, and benzyl benzoate were found in some cultivars. The composition of floral volatiles in cultivars with white flowers was similar, in which benzyl acetate was dominant, while within pink flowers, there were differences of floral volatile compositions Principal component anal. (PCA) showed that the emissions of benzyl alc., cinnamyl alc., benzyl acetate, eugenol, cinnamyl acetate, and benzyl benzoate could make these intraspecific cultivars distinguishable from each other. Further, hierarchical cluster anal. indicated that cultivars with similar a category and amount of floral compounds were grouped together. Our findings lay a theor. basis for fragrant plant breeding in P. mume.

Molecules published new progress about Fatty acids 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, Product Details of C9H10O2.

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

Tian, Jing-Pu published the artcileTranscriptomic and proteomic approaches to explore the differences in monoterpene and benzenoid biosynthesis between scented and unscented genotypes of wintersweet, Category: esters-buliding-blocks, the main research area is Chimonanthus monoterpene benzenoid biosynthesis genotype transcriptomics proteomics.

Wintersweet (Chimonanthus praecox L.) is an important ornamental plant in China with a pleasant floral scent. To explore the potential mechanisms underlying differences in the fragrances among genotypes of this plant, we analyzed floral volatile organic compounds (VOCs) from two different genotypes: SW001, which has little to no fragrance, and the scented genotype H29. The major VOCs in H29 were linalool, trans-β-ocimene, benzyl acetate, Me salicylate, benzyl alc. (BAlc) and Me benzoate. The most important aroma-active compound in H29, linalool, was emitted at a low concentration in SW001, which had markedly higher levels of trans-β-ocimene than H29. Next, to investigate scent biosynthesis, we analyzed the transcriptome and proteome of fully open flowers of the two genotypes. A total of 14 443 differentially expressed unigenes and 196 differentially expressed proteins were identified. Further analyses indicated that 56 differentially expressed genes involved in the terpenoid and benzenoid biosynthesis pathways might play critical roles in regulating floral fragrance difference. Disequilibrium expression of four terpene synthase genes resulted in diverse emission of linalool and trans-β-ocimene in both genotypes. In addition, the expressions of two CpMYC2 transcription factors were both upregulated in H29, implying that they may regulate linalool production Notably, 16 of 20 genes in the benzenoid biosynthesis pathway were downregulated, corresponding to the relatively low level of benzenoid production in SW001. The lack of benzyl acetate might indicate that SW001 may lack substrate BAlc or functional acetyl-CoA:benzylalc. acetyltransferase.

Physiologia Plantarum published new progress about Chimonanthus praecox. 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

Baral, Anirban published the artcileFinding the fragrance genes of wintersweet, Computed Properties of 140-11-4, the main research area is Chimonanthus floral scent volatile organic compound.

Fragrant flowers emit a complex mixture of volatile organic compounds (VOCs) that we perceive as pleasant. While we know the chem. nature of these volatiles, the mol. traits that regulate their biosynthesis are poorly understood. In this issue, Tian et al. (2019) compare the transcriptomic and proteomic profiles of a scented genotype of wintersweet (Chimonanthus praecox) with a non-scented one. By correlating the differential gene expression profile with the observed differences in VOC profiles, they attempt to identify the genes that regulate the fragrance of wintersweet.

Physiologia Plantarum published new progress about Biomarkers. 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

Cheng, Zenghui published the artcileSustainable elastomers derived from cellulose, rosin and fatty acid by a combination of “”graft from”” RAFT and isocyanate chemistry, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is cellulose rosin fatty acid elastomer RAFT isocyanate chem; Biobased elastomers; Ethyl cellulose; RAFT.

Utilization of natural sustainable feedstock to fabricate polymers has attracted remarkable attention. In this work, we reported a strategy to prepare a series of grafted copolymers from rosin, fatty acids and Et cellulose. The process involved the preparation of EC-based macro-RAFT agent through a simple esterification reaction, followed by a “”grafting from”” reversible addition-fragmentation chain transfer polymerization (RAFT) of DAGMA (derived from rosin) and LMA (derived from fatty acid) to achieve a class of EC-g-P(DAGMA-co-LMA) graft copolymers with a tunable Tg tuned by the DAGMA/LMA molar ratio. Then, hexamethylene diisocyanate (HDI) was used to crosslink these graft copolymers. The mech. and dynamic thermo-mech. properties of tests showed that elastic recovery values of copolymers were enhanced to 90%, as compared to the un-crosslinked samples. Addnl., all these polymers showed an excellent UV absorption performance. This study provides a facile way to fabricate biobased elastomeric materials with improved mech. properties.

International Journal of Biological Macromolecules published new progress about Crosslinking. 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

Zhong, Wu published the artcileEffect of selected yeast on physicochemical and oenological properties of blueberry wine fermented with citrate-degrading Pichia fermentans, Computed Properties of 41114-00-5, the main research area is blueberry wine citrate degrading Pichia fermentation deacidification.

Blueberry wine has an excessively sour taste due to the presence of high-level of organic acids. Pichia fermentans JT-1-3 with a strong ability to degrade citric acid was selected for blueberry wine production in this work. The flocculation of JT-1-3 in comparison with two S. cerevisiaes strains was evaluated. Then citric acid degradation of JT-1-3 was assessed in synthetic media with different citric acid/glucose ratios under shaking or static conditions. Finally, JT-1-3 was inoculated in blueberry juice for fermentation The results confirmed that JT-1-3 had appropriate flocculation and consumed citric acid and glucose greatly. In final wines, 6.25% (volume/volume) alc. was achieved with 1.83% (weight/weight) residual sugar. Compared with juice, citric, malic and tartaric acids declined significantly by 43.35%, 35.29% and 44.68% in wine, resp. 2-phenylethanol, Et 9-hexadecenoate, Et decanoate were the main volatiles in blueberry wine and most esters contributed to the aroma with high odor activity values. Sensory evaluation showed that wine produced by JT-1-3 imparted improved taste with lower acidity, bitterness and hotness perceptions compared with S. cerevisiae fermentation This work revealed that JT-1-3 had a great potential to be applied for blueberry wine fermentation along with deacidification.

LWT–Food Science and Technology published new progress about Blueberry. 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, Computed Properties of 41114-00-5.

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

Yoon, Hyun Joong published the artcileNative low density lipoprotein increases the production of both nitric oxide and reactive oxygen species in the human umbilical vein endothelial cells, Formula: C24H14Cl2O7, the main research area is eNOS LDL ROS umbilical vein endothelial cell oxidative stress; Human umbilical vein endothelial cell; Inducible nitric oxide synthase; Native low density lipoprotein; Nitric oxide; Reactive oxygen species.

Background: Nitric oxide synthases (NOSs) are a unique family of enzymes that catalyze the production of nitric oxide (NO) from L-arginine. Atherogenic action of oxidized low-d. lipoproteins (oxLDL) may be mediated partly by the formation of NO in endothelial cells. Objective: The objective of this study was to identify sources of reactive oxygen species (ROS) causing native LDL (nLDL)-induced senescence of cultured human umbilical vein endothelial cells (HUVECs). Methods: HUVECs were treated with nLDL and NO production was assessed using Griess reagent as substrate and spectrophotometry in the absence or presence of specific inhibitors of endothelial NOS (eNOS) and inducible NOS (iNOS). In addition, expression levels of eNOS and iNOS were measured with ELISA and western blotting, and ROS was evaluated using 2′,7′-dichlorofluorescin diacetate (DCF-DA) and a fluorescence microplate reader. Results: NO formation in nLDL-treated HUVECs was significantly increased. Long-term treatment with nLDL up-regulated both eNOS and iNOS proteins. Such increase of NO production in HUVECs induced by nLDL was significantly suppressed by treatment with iNOS-selective inhibitor 1400 W, but not by the eNOS-selective inhibitor L-NIO. Native LDL treatment uncoupled Hsp90, the regulatory binding protein of eNOS, from the enzyme in HUVECs. Native LDL also significantly increased ROS production in HUVECs.

Genes & Genomics published new progress about Heat-shock protein HSP90 Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 2044-85-1 belongs to class esters-buliding-blocks, name is 2′,7′-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl diacetate, and the molecular formula is C24H14Cl2O7, Formula: C24H14Cl2O7.

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

Hargest, Virginia published the artcileAstrovirus replication is inhibited by nitazoxanide in vitro and in vivo, Recommanded Product: 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, the main research area is nitazoxanide antiviral agent astrovirus replication; antiviral agents; astrovirus; diarrhea; viral replication.

Astroviruses (AstV) are a leading cause of diarrhea, especially in the very young, the elderly, and immunocompromised populations. Despite their significant impact on public health, no drug therapies for astrovirus have been identified. In this study, we fill this gap in knowledge and demonstrate that the FDA-approved broad-spectrum anti-infective drug nitazoxanide (NTZ) blocks astrovirus replication in vitro with a 50% effective concentration (EC50) of approx. 1.47 μM. It can be administered up to 8 h postinfection and is effective against multiple human astrovirus serotypes, including clin. isolates. Most importantly, NTZ reduces viral shedding in vivo, exhibiting its potential as a future clin. therapeutic.

Journal of Virology published new progress about Antiviral agents Role: PAC (Pharmacological Activity), THU (Therapeutic Use), BIOL (Biological Study), USES (Uses). 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, Recommanded Product: 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate.

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

Miner, Kent published the artcileDrug repurposing: the anthelmintics niclosamide and nitazoxanide are potent TMEM16A antagonists that fully bronchodilate airways, Synthetic Route of 55981-09-4, the main research area is asthma niclosamide nitazoxanide TMEM16A smooth muscle depolarization contraction; TMEM16A antagonist; airway smooth muscle (ASM); bronchodilator; calcium-activated chloride channel; desensitization; drug repositioning; niclosamide; nitazoxanide.

There is an unmet need in severe asthma where approx. 40% of patients exhibit poor β-agonist responsiveness, suffer daily symptoms and show frequent exacerbations. Antagonists of the Ca2+-activated Cl- channel, TMEM16A, offers a new mechanism to bronchodilate airways and block the multiple contractiles operating in severe disease. To identify TMEM16A antagonists we screened a library of ∼580,000 compounds The anthelmintics niclosamide, nitazoxanide, and related compounds were identified as potent TMEM16A antagonists that blocked airway smooth muscle depolarization and contraction. To evaluate whether TMEM16A antagonists resist use- and inflammatory-desensitization pathways limiting β-agonist action, we tested their efficacy under harsh conditions using maximally contracted airways or airways pretreated with a cytokine cocktail. Stunningly, TMEM16A antagonists fully bronchodilated airways, while the β-agonist isoproterenol showed only partial effects. Thus, antagonists of TMEM16A and repositioning of niclosamide and nitazoxanide represent an important addnl. treatment for patients with severe asthma and COPD that is poorly controlled with existing therapies. It is of note that drug repurposing has also attracted wide interest in niclosamide and nitazoxanide as a new treatment for cancer and infectious disease. For the first time we identify TMEM16A as a mol. target for these drugs and thus provide fresh insights into their mechanism for the treatment of these disorders in addition to respiratory disease.

Frontiers in Pharmacology published new progress about Anthelmintics. 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, Synthetic Route of 55981-09-4.

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

Yang, Zeyu published the artcileEfficient asymmetric synthesis of chiral alcohols using high 2-propanol tolerance alcohol dehydrogenase SmADH2 via an environmentally friendly TBCR system, Application In Synthesis of 539-88-8, the main research area is asym synthesis chiral alc propanol oxidation alc dehydrogenase; thermostatic bubble column reactor system alc dehydrogenase ketone reduction.

Alc. dehydrogenases (ADHs) together with the economical substrate-coupled cofactor regeneration system play a pivotal role in the asym. synthesis of chiral alcs.; however, severe challenges concerning the poor tolerance of enzymes to 2-propanol and the adverse effects of the byproduct, acetone, limit its applications, causing this strategy to lapse. Herein, a novel ADH gene smadh2 was identified from Stenotrophomonas maltophilia by traditional genome mining technol. The gene was cloned into Escherichia coli cells and then expressed to yield SmADH2. SmADH2 has a broad substrate spectrum and exhibits excellent tolerance and superb activity to 2-propanol even at 10.5 M (80%, volume/volume) concentration Moreover, a new thermostatic bubble column reactor (TBCR) system is successfully designed to alleviate the inhibition of the byproduct acetone by gas flow and continuously supplement 2-propanol. The organic waste can be simultaneously recovered for the purpose of green synthesis. In the sustainable system, structurally diverse chiral alcs. are synthesized at a high substrate loading (>150 g L-1) without adding external coenzymes. Among these, about 780 g L-1 (6 M) Et acetoacetate is completely converted into Et (R)-3-hydroxybutyrate in only 2.5 h with 99.9% ee and 7488 g L-1 d-1 space-time yield. Mol. dynamics simulation results shed light on the high catalytic activity toward the substrate. Therefore, the high 2-propanol tolerance SmADH2 with the TBCR system proves to be a potent biocatalytic strategy for the synthesis of chiral alcs. on an industrial scale.

Catalysis Science & Technology published new progress about Biochemical cofactors Role: BCP (Biochemical Process), BPN (Biosynthetic Preparation), BUU (Biological Use, Unclassified), BIOL (Biological Study), PROC (Process), PREP (Preparation), USES (Uses) (regeneration of). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application In Synthesis of 539-88-8.

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