Category: esters-buliding-blocks

Talaam, Keith Kiplangat published the artcileMitochondria as a potential target for the development of prophylactic and therapeutic drugs against Schistosoma mansoni infection, Product Details of C12H9N3O5S, the main research area is Schistosoma mansoni infection mitochondria prophylactic therapeutic drug; drug development; electron transport chain; fumarate respiration; in vivo model; mitochondria; schistosomiasis.

The emergence of parasites resistant to praziquantel, the only therapeutic agent, and its ineffectiveness as a prophylactic agent (inactive against the migratory/juvenile Schistosoma mansoni), make the development of new antischistosomal drugs urgent. The parasite’s mitochondrion is an attractive target for drug development, because this organelle is essential for survival throughout the parasite’s life cycle. We investigated the effects of 116 compounds against Schistosoma mansoni cercaria motility that have been reported to affect mitochondrion-related processes in other organisms. Next, eight compounds plus two controls (mefloquine and praziquantel) were selected and assayed against the motility of schistosomula (in vitro) and adults (ex vivo). Prophylactic and therapeutic assays were performed using infected mouse models. Inhibition of oxygen consumption rate (OCR) was assayed using Seahorse XFe24 analyzer. All selected compounds showed excellent prophylactic activity, reducing the worm burden in the lungs to less than 15% of that obtained in the vehicle control. Notably, ascofuranone showed the highest activity, with a 98% reduction of the worm burden, suggesting the potential for the development of ascofuranone as a prophylactic agent. The worm burden of infected mice with S. mansoni at the adult stage was reduced by more than 50% in mice treated with mefloquine, nitazoxanide, amiodarone, ascofuranone, pyrvinium pamoate, or plumbagin. Moreover, adult mitochondrial OCR was severely inhibited by ascofuranone, atovaquone, and nitazoxanide, while pyrvinium pamoate inhibited both mitochondrial and nonmitochondrial OCRs. These results demonstrate that the mitochondria of S. mansoni are a feasible target for drug development.

Antimicrobial Agents and Chemotherapy published new progress about Cell migration. 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, Product Details of C12H9N3O5S.

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

Yang, Yilei published the artcileDesign, synthesis, and biological characterization of novel PEG-linked dimeric modulators for CXCR4, Product Details of C28H37NO9, the main research area is polyethylene glycol dimeric peptide preparation CXCR4 modulator; CXCR4; Dimeric ligands; PEG.

CXCR4 dimerization has been widely demonstrated both biol. and structurally. This paper mainly focused on the development of structure-based dimeric ligands that target CXCL12-CXCR4 interaction and signaling. This study presents the design and synthesis of a series of [PEG]n linked dimeric ligands of CXCR4 based on the knowledge of the homodimeric crystal structure of CXCR4 and the authors’ well established platform of chem. and bioassays for CXCR4. These new ligands include [PEG]n linked homodimeric or heterodimeric peptides consisting of either two DV3-derived moieties (where DV3 is an all-D-amino acid analog of N-terminal modules of 1-10 (V3) residues of vMIP-II) or hybrids of DV3 moieties and CXCL121-8. Among a total of 24 peptide ligands, four antagonists and three agonists showed good CXCR4 binding affinity, with IC50 values of <50 nM and <800 nM, resp. Chemotaxis and calcium mobilization assays with SUP-T1 cells further identified two promising lead modulators of CXCR4: ligand 4 ((DV3-PEG3)2K), a [PEG3]2 linked homodimeric DV3, was an effective CXCR4 antagonist (IC50 = 22 nM); and ligand 21 (DV3-PEG3-K-(PEG3-CXCL121-8)), a [PEG3]2 linked heterodimeric DV3-CXCL121-8, was an effective CXCR4 agonist (IC50 = 407 nM). These dimeric CXCR4 modulators represent new mol. probes and therapeutics that effectively modulate CXCL12-CXCR4 interaction and function. Bioorganic & Medicinal Chemistry published new progress about Cell migration. 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, Product Details of C28H37NO9.

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

Yang, Bo published the artcileHost cells with transient overexpression of MDR1 as a novel in vitro model for evaluating on-target effect for activity against the epicellular Cryptosporidium parasite, Product Details of C12H9N3O5S, the main research area is Cryptosporidium MDR1 anticryptosporidial antiparasitic paclitaxel.

To rapidly generate host cells with resistance to multiple compounds for differentiating drug action on parasite target or the host cell target (i.e. on-target or off-target effect) against the zoonotic enteric parasite Cryptosporidium parvum. Transient overexpression of a multidrug resistance protein 1 (MDR1) gene in host cells (HCT-8 cell line) was explored to increase drug tolerance of the host cells to selected anti-cryptosporidial leads. In vitro cytotoxicity and anti-cryptosporidial efficacy of selected compounds were evaluated on the parasite grown in WT parental and transiently transfected HCT-8 cells. The approach was based on the theory that, for an epicellular parasite receiving consistent exposure to compounds in culture medium, overexpressing MDR1 in HCT-8 cells would increase drug tolerance of host cells to selected compounds but would not affect the anti-cryptosporidial efficacy if the compounds acted solely on the parasite target and the drug action on host cell target played no role on the antiparasitic efficacy. Six known anti-cryptosporidial leads were tested. Transient overexpression of MDR1 increased drug tolerance of HCT-8 cells on paclitaxel, doxorubicin HCl and vincristine sulfate (2.11- to 2.27-fold increase), but not on cyclosporin A, daunorubicin HCl and nitazoxanide. Increased drug tolerance in host cells had no effect on antiparasitic efficacy of paclitaxel, but affected that of doxorubicin HCl. Data confirmed that, at efficacious concentrations, paclitaxel acted mainly on the parasite target, while doxorubicin might act on both parasite and host cell targets. This model can be employed for studying the action of addnl. anti-cryptosporidial leads, and adapted to studying drug action in other epicellular pathogens. The limitation of the model is that the anti-cryptosporidial leads/hits need to be MDR1 substrates.

Journal of Antimicrobial Chemotherapy published new progress about Cell viability. 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, Product Details of C12H9N3O5S.

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

Hu, Kai published the artcileFruity aroma modifications in Merlot wines during simultaneous alcoholic and malolactic fermentations through mixed culture of S. cerevisiae, P. fermentans, and L. brevis, Category: esters-buliding-blocks, the main research area is alc malolactic fermentation Lactobacillus brevis Saccharomyces cerevisiae Pichia fermentans.

As a group of wine lactic acid bacteria, Lactobacillus has gained growing interest in malolactic fermentation due to possessing diverse aroma-related enzymes. In this study, a Lactobacillus brevis 26 with high β-glucosidase activity was isolated, and co-inoculated with yeasts (Saccharomyces cerevisiae and Pichia fermentans) to characterize fruity aroma modifications in Merlot wine. Compared with the traditional inoculation (sequential inoculation of L. brevis 26 after alc. fermentation by yeasts), co-inoculation of the three species induced simultaneous alc. and malolactic fermentations, leading to a pronounced reduction in total fermentation duration. P. fermentans increased L. brevis 26 cell viability when co-fermented with the predominant species S. cerevisiae. Meanwhile, the β-glucosidase activity of L. brevis 26 elevated terpene contents, and P. fermentans induced the production of higher alc. acetates and fatty acid Et esters. Sensory anal. showed that co-inoculation-based wines had enhanced complexity of fruity aroma profiles associated with jammy and temperate fruity notes.

LWT–Food Science and Technology published new progress about Cell viability. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Category: esters-buliding-blocks.

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

Deuscher, Zoe published the artcileKey aroma compounds of dark chocolates differing in organoleptic properties: a GC-O comparative study., Synthetic Route of 123-29-5, the main research area is dark chocolate organoleptic property correspondence hierarchical cluster analysis; comparative detection frequency analysis (cDFA); correspondence analysis (CA); dark chocolate; gas chromatography-olfactometry (GC-O); heatmap; hierarchical cluster analysis (HCA); key aroma; key odorant; nasal impact frequency (NIF).

Dark chocolate samples were previously classified into four sensory categories. The classification was modelled based on volatile compounds analyzed by direct introduction mass spectrometry of the chocolates’ headspace. The purpose of the study was to identify the most discriminant odor-active compounds that should characterize the four sensory categories. To address the problem, a gas chromatog.-olfactometry (GC-O) study was conducted by 12 assessors using a comparative detection frequency anal. (cDFA) approach on 12 exemplary samples. A nasal impact frequency (NIF) difference threshold combined with a statistical approach (Khi2 test on k proportions) revealed 38 discriminative key odorants able to differentiate the samples and to characterize the sensory categories. A heatmap emphasized the 19 most discriminant key odorants, among which heterocyclic mols. (furanones, pyranones, lactones, one pyrrole, and one pyrazine) played a prominent role with secondary alcs., acids, and esters. The initial sensory classes were retrieved using the discriminant key volatiles in a correspondence anal. (CA) and a hierarchical cluster anal. (HCA). Among the 38 discriminant key odorants, although previously identified in cocoa products, 21 were formally described for the first time as key aroma compounds of dark chocolate. Moreover, 13 key odorants were described for the first time in a cocoa product.

Molecules published new progress about Cocoa products. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Synthetic Route of 123-29-5.

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

Chi, Xuelu published the artcileDistinction of volatile flavor profiles in various skim milk products via HS-SPME-GC-MS and E-nose, COA of Formula: C11H22O2, the main research area is skim milk product volatile flavor profile HSSPMEGCMS E nose.

Volatile flavor profile of skim milk relates to product quality and consumer liking. The volatile compositions of different skim milk products are challenging to discriminate due to subtle constituents and inconspicuous peculiarities. This study develops a correlative anal. protocol for the characterization and differentiation of volatile flavor components in various skim milk products via headspace solid-phase micro-extraction gas chromatog.-mass spectrometry (HS-SPME-GC-MS) and electronic nose (E-nose) with multivariate statistical anal. Sixty-three volatile flavor components were identified in six skim milk products, which were paired into pasteurized skim milk, ultra-high-temperature skim milk, and modified skim milk, resp. Distinguishable variation trends were observed upon the aroma response values of skim milk samples through the solid-state E-nose sensors. The results of principal component anal., cluster heatmap anal. and Venn diagram anal. showed that significant distinctions in varying degrees among the six skim milk products could be presented in both volatile flavor composition and aroma release distribution. The correlative anal. by partial least squares regression indicated an adequate combination of HS-SPME-GC-MS and E-nose for the differentiation and classification of volatile flavor profiles in skim milk products. These findings provide an insightful perspective for the efficient flavor evaluation of fluid skim milk.

European Food Research and Technology published new progress about Dairy products. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, COA of Formula: C11H22O2.

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

Chi, Xuelu published the artcileDistinction of volatile flavor profiles in various skim milk products via HS-SPME-GC-MS and E-nose, Safety of Methyl octanoate, the main research area is skim milk product volatile flavor profile HSSPMEGCMS E nose.

Volatile flavor profile of skim milk relates to product quality and consumer liking. The volatile compositions of different skim milk products are challenging to discriminate due to subtle constituents and inconspicuous peculiarities. This study develops a correlative anal. protocol for the characterization and differentiation of volatile flavor components in various skim milk products via headspace solid-phase micro-extraction gas chromatog.-mass spectrometry (HS-SPME-GC-MS) and electronic nose (E-nose) with multivariate statistical anal. Sixty-three volatile flavor components were identified in six skim milk products, which were paired into pasteurized skim milk, ultra-high-temperature skim milk, and modified skim milk, resp. Distinguishable variation trends were observed upon the aroma response values of skim milk samples through the solid-state E-nose sensors. The results of principal component anal., cluster heatmap anal. and Venn diagram anal. showed that significant distinctions in varying degrees among the six skim milk products could be presented in both volatile flavor composition and aroma release distribution. The correlative anal. by partial least squares regression indicated an adequate combination of HS-SPME-GC-MS and E-nose for the differentiation and classification of volatile flavor profiles in skim milk products. These findings provide an insightful perspective for the efficient flavor evaluation of fluid skim milk.

European Food Research and Technology published new progress about Dairy products. 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

Chi, Xuelu published the artcileDistinction of volatile flavor profiles in various skim milk products via HS-SPME-GC-MS and E-nose, Application of Ethyl nonanoate, the main research area is skim milk product volatile flavor profile HSSPMEGCMS E nose.

Volatile flavor profile of skim milk relates to product quality and consumer liking. The volatile compositions of different skim milk products are challenging to discriminate due to subtle constituents and inconspicuous peculiarities. This study develops a correlative anal. protocol for the characterization and differentiation of volatile flavor components in various skim milk products via headspace solid-phase micro-extraction gas chromatog.-mass spectrometry (HS-SPME-GC-MS) and electronic nose (E-nose) with multivariate statistical anal. Sixty-three volatile flavor components were identified in six skim milk products, which were paired into pasteurized skim milk, ultra-high-temperature skim milk, and modified skim milk, resp. Distinguishable variation trends were observed upon the aroma response values of skim milk samples through the solid-state E-nose sensors. The results of principal component anal., cluster heatmap anal. and Venn diagram anal. showed that significant distinctions in varying degrees among the six skim milk products could be presented in both volatile flavor composition and aroma release distribution. The correlative anal. by partial least squares regression indicated an adequate combination of HS-SPME-GC-MS and E-nose for the differentiation and classification of volatile flavor profiles in skim milk products. These findings provide an insightful perspective for the efficient flavor evaluation of fluid skim milk.

European Food Research and Technology published new progress about Dairy products. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Application of Ethyl nonanoate.

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

Deuscher, Zoe published the artcileVolatile compounds profiling by using proton transfer reaction-time of flight-mass spectrometry (PTR-ToF-MS). The case study of dark chocolates organoleptic differences, Product Details of C9H10O2, the main research area is volatile compound dark chocolate organoleptic proton transfer TOF MS; CovSel; PLS-DA; PTR-ToF-MS; VOCs; chocolate; classification; profiling.

Direct-injection mass spectrometry (DIMS) techniques have evolved into powerful methods to analyze volatile organic compounds (VOCs) without the need of chromatog. separation Combined to chemometrics, they have been used in many domains to solve sample categorization issues based on volatilome determination In this paper, different DIMS methods that have largely outperformed conventional electronic noses (e-noses) in classification tasks are briefly reviewed, with an emphasis on food-related applications. A particular attention is paid to proton transfer reaction mass spectrometry (PTR-MS), and many results obtained using the powerful PTR-time of flight-MS (PTR-ToF-MS) instrument are reviewed. Data anal. and feature selection issues are also summarized and discussed. As a case study, a challenging problem of classification of dark chocolates that has been previously assessed by sensory evaluation in four distinct categories is presented. The VOC profiles of a set of 206 chocolate samples classified in the four sensory categories were analyzed by PTR-ToF-MS. A supervised multivariate data anal. based on partial least squares regression-discriminant anal. allowed the construction of a classification model that showed excellent prediction capability: 97% of a test set of 62 samples were correctly predicted in the sensory categories. Tentative identification of ions aided characterization of chocolate classes. Variable selection using dedicated methods pinpointed some volatile compounds important for the discrimination of the chocolates. Among them, the CovSel method was used for the first time on PTR-MS data resulting in a selection of 10 features that allowed a good prediction to be achieved. Finally, challenges and future needs in the field are discussed.

Journal of Mass Spectrometry published new progress about Dark chocolate. 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

Aakko-Saksa, Paivi T. published the artcileRenewable Methanol with Ignition Improver Additive for Diesel Engines, Application of Ethyl 4-oxopentanoate, the main research area is methanol fuel ignition improver additive diesel engine.

Reduced emissions and environmental burden from shipping are an important aim of tightening emission regulations and ambitious climate change strategy. Renewable methanol produced from biomass or from other renewable sources represents one option to face these challenges. We studied the potential of renewable methanol to offer such benefits in diesel operation in a Scania ethanol engine, which is designed for additized ethanol fuel (ED95) containing ignition improver and lubricity additives. Methanol (MD95) with several types of ignition improver and lubricity additives was studied for use in diesel engines. MD95 fuels were clean-burning, emitting even less gaseous emissions than ED95, particularly when glycerol ethoxylate was used as an ignition improver. Particle mass and number emissions originating from additives in the exptl. fuels could be reduced with an oxidation catalyst. Reduced additive dosing in the MD95 fuels was studied with the aid of fuel injection into the intake manifold. Overall, the results showed that the monofuel MD95 concept is a promising solution for smaller vessels equipped with 800-1200 kW engines.

Energy & Fuels published new progress about Diesel engines. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application of Ethyl 4-oxopentanoate.

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