Category: esters-buliding-blocks

Lu, Nannan published the artcileAcid-responsive endosomolytic polymeric nanoparticles with amplification of intracellular oxidative stress for prodrug delivery and activation, Name: 2′,7′-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl diacetate, the main research area is prodrug delivery endosomolytic polymeric nanoparticle intracellular oxidative stress.

Prodrug strategy especially in the field of chemotherapy of cancers possesses significant advantages reducing the side toxicity of anticancer drugs. However, high-efficiency delivery and in situ activation of prodrugs for tumor growth suppression are still a great challenge. Herein, we report rationally engineered pH-responsive endosomolytic polymeric micelles for the delivery of an oxidation-activable prodrug into the cytoplasm of cancer cells and amplification of intracellular oxidative stress for further prodrug activation. The prepared block copolymers consist of a poly(ethylene glycol) (PEG) block and a segment grafted by endosomolytic moieties and acetal linkage-connected cinnamaldehyde groups. The amphiphilic diblock copolymers can self-assemble to form micelles in water for loading the oxidation-activable phenylboronic pinacol ester-caged camptothecin prodrug (ProCPT). The obtained micelles can release free cinnamaldehyde under acidic conditions in tumor tissues and endo/lysosomes followed by efficient endosomal escape, which further induces enhancement of intracellular reactive oxygen species (ROS) to activate the prodrugs. Simultaneously, intracellular glutathione (GSH) can be reduced by quinone methide that was produced during prodrug activation. The ProCPT-loaded micelles can finally achieve efficient tumor accumulation and retention as well as effective tumor growth inhibition. More importantly, hematol. and pathol. anal. of toxicity reveals that the ProCPT-loaded micelles do not cause obvious toxic side effects toward important organs of mice. A pos. immunomodulatory microenvironment in tumor tissue and serum can be detected after treatment with ProCPT-loaded micelles. Therefore, the endosomolytic ProCPT-loaded micelles exert synergistic therapeutic effects toward tumors through amplification of intracellular oxidative stress and activation of the prodrugs.

Biomaterials Science published new progress about Amphiphiles. 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, Name: 2′,7′-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl diacetate.

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

Kanno, Rikuto published the artcileReversible Co-Self-Assembly and Self-Sorting Systems of Polymer Micelles in Water: Polymers Switch Association Partners in Response to Salts, Category: esters-buliding-blocks, the main research area is self sorting system polymer micelle water switch partner.

Reversible self-sorting and co-self-assembly systems of amphiphilic synthetic mols. in water would bring innovative methodologies in creating repeatedly transformable multicomponent self-assemblies that are responsive to the outer environment and stimuli. Herein, we report reversible co-self-assembly and self-sorting systems of the binary blends of amphiphilic random copolymers bearing quaternary ammonium cation and dodecyl groups and those carrying poly(ethylene glycol) (PEG) chains and dodecyl groups in water. The cation copolymers co-self-assembled with the PEG copolymers to form cation/PEG-fused micelles in pure water, while the fused micelles self-sorted into discrete cation or PEG micelles in the presence of salts. Importantly, those random copolymers reversibly switch association partners in response to the presence or absence of salts in water. The size of the fused micelles was dependent on their copolymer composition but independent of the mixing ratio of cation and PEG copolymers. The fused micelles thus coexisted with the extra amount of cation or PEG micelles. We further revealed that the co-self-assembly and self-sorting of their copolymers are driven by the exchange of polymer chains between micelles like the exchange of subdomains in protein self-assemblies.

Macromolecules (Washington, DC, United States) published new progress about Amphiphiles. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Category: esters-buliding-blocks.

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

Koda, Yuta published the artcileAmphiphilic Poly[poly(ethylene glycol) methacrylate]s with OH Groups in the PEG Side Chains for Controlling Solution/Rheological Properties and toward Bioapplication, Name: Dodecyl 2-methylacrylate, the main research area is hydroxyl group amphiphilic polyethylene glycol methacrylate bioapplication; PEGylation; amphiphilic copolymers; bioapplication; living radical polymerization; poly(ethylene glycol); protein−polymer conjugation.

Poly[poly(ethylene glycol) methacrylate]s with OH groups on the PEG side chains [poly(PEGOHMA)s] were synthesized using ruthenium-catalyzed living radical polymerization (Ru-LRP) to diversify the polymer design of PEGylated methacrylate-based copolymers. Poly(PEGOHMA)s could not be prepared using the approach previously reported for the synthesis of poly[poly(ethylene glycol) Me ether methacrylate] [poly(PEGMA)]; therefore, the polymerization was adapted for poly(PEGOHMA)s. As a result, both homopolymerization and random and block copolymerization of PEGOHMA with other hydrophobic monomers were successfully achieved, resulting in the preparation of amphiphilic random block and star polymers. The solution and bulk properties of PEGOHMA-based (co)polymers were markedly different from those of PEGMA-based (co)polymers. By reacting the OH groups with biotin, protein-poly(PEGOHMA) conjugates were successfully prepared; however, it was not possible to prepare protein-polymer conjugates using terminal biotinylated PEGMA-based copolymers, owing to the steric hindrance of the unreactive PEG side chains.

ACS Applied Bio Materials published new progress about Amphiphiles. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Name: Dodecyl 2-methylacrylate.

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

Kushnirov Melnitzer, Vladislav published the artcileHybrid Titanium Oxide/Polymer Amphiphilic Nanomaterials with Controlled Size for Drug Encapsulation and Delivery, Application of 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, the main research area is nanoparticle titanium oxide polymer pharmaceutical.

This work describes for the first time the synthesis of hybrid drug-loaded TiO2/polymer amphiphilic nanoparticles of finely controlled size utilizing a simple and reproducible sol-gel process that comprises the formation of a titanium(IV)/acetone oxo-organo complex followed by its blending with an amphiphilic poly(ethylene oxide)-b-poly(propylene oxide) block copolymer in acetone and its aqueous-phase nanopptn. The size of the hybrid nanoparticles is governed by the complex aging, e.g., hybrid nanoparticles display diameter between 228 and 53 nm for aging of 1 and 36 days, resp. (dynamic light scattering). In addition, they show excellent phys. stability in water owing to the coating of the surface with poly(ethylene oxide) blocks of the copolymer. Conversely, polymer-free TiO2 particles are large and precipitate fast. Incorporation of a model hydrophobic drug, nitazoxanide, to the precursor solution results in hybrid nanoparticles containing 12.9% weight/weight cargo that is released following a bimodal profile. High-resolution transmission electron microscopy (Titan Cubed Themis G2 300) anal. reveals the porous amorphous nanostructure of these novel hybrids and colocalization of drug and copolymer in the nanoparticle bulk. Finally, upon ultrasonication, our hybrid nanoparticles produce reactive oxygen species in vitro which paves the way for their use in sonodynamic and drug release therapies.

Advanced Functional Materials published new progress about Amphiphiles. 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, Application of 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate.

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

Schreur-Piet, Ingeborg published the artcileAmphiphilic Statistical Copolymers from Catalytic Chain Transfer as Reactive Surfactants in Emulsion Polymerization, Application of Dodecyl 2-methylacrylate, the main research area is amphiphilic statistical copolymer chain transfer reactive surfactant emulsion polymerization.

Statistical copolymers of methacrylic acid (MAA) and Me methacrylate (MMA), Bu methacrylate (BMA), or lauryl methacrylate (LMA) were synthesized via cobalt(II)-mediated catalytic chain transfer polymerization (CCTP) and used as macromonomeric stabilizers in the emulsion polymerization of MMA. By varying the composition, length, and concentration of the macromonomers, we were able to tune the particle size, molar mass, and rheol. behavior of the latexes. Most latexes stabilized with macromonomers containing BMA and LMA showed rheol. properties such as small yield stress and shear thinning behavior similar to those of binders for coating applications.

ACS Applied Polymer Materials published new progress about Amphiphiles. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Application of Dodecyl 2-methylacrylate.

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

Piesik, Dariusz published the artcileInduction of volatile organic compounds in Triticum aestivum (wheat) plants following infection by different Rhizoctonia pathogens is species specific, Related Products of esters-buliding-blocks, the main research area is Triticum Rhizoctonia VOC benzyl acetate hexenal linalool mycelium; Odors; Poaceae; Rhizoctonia spp. pathogens; Triticum aestivum; VOCs; Volatile organic compounds; Wheat.

The most popular means of plant protection is the chem. method, but this control is often connected with the need for repeating chem. treatments. Thus, eco-friendly strategies should be developed where, under the European Green Deal, aromatic plants and their repellent properties seem to constitute a good alternative. In earlier studies, we have shown that insect injury, bacteria infestation and pathogen infection induce plant volatile organic compounds (VOCs) emission, which can provide defensive functions to plants. In this study, Triticum aestivum L.(Poaceae) cv. ′Jenga′ wheat plants were intentionally infected with one of four Rhizoctonia species (R. cerealis, R. solani, R. zeae, and R. oryzae). The soil was inoculated by the pathogens during sowing, whereas shoots were inoculated at stage BBCH 33. In greenhouse experiments, we measured VOCs from wheat 3, 7 and 11 days following stem infestation, or 42 days following soil inoculation of Rhizoctonia spp. VOC emissions were found to be largest on days 7 or 11 post-stem inoculation (>3 days post-stem inoculation >42 days post-soil inoculation). T. aestivum infected by pathogens induced five common green leaf volatiles (GLVs), namely (Z)-3-hexenal = (Z)-3-HAL, (E)-2-hexenal = (E)-2-HAL, (Z)-3-hexen-1-ol = (Z)-3- HOL, (E)-2-hexenol = (E)-2-HOL, (Z)-3-hexen-1-yl acetate = (Z)-3-HAC], six common terpenes (β-pinene = β-PIN, β-myrcene = β-MYR, Z-ocimene = Z-OCI, linalool = LIN, benzyl acetate = BAC, β-caryophyllene = β-CAR), and indole = IND. We found that R. cerealis infested T. aestivum emitted the largest amounts of (Z)-3-HAL and (Z)-3-HAC, while T. aestivum infested by R. solani released the largest amount of LIN (7 or 11 days following stem infestation). VOCs released by the T. aestivum after R. cerealis (AGD I) and R. solani (AG 5) infestations were significantly larger in comparison to R. zeae (WAG-Z) and R. oryzae (WAG-O) for the volatiles (Z)-3-HAL, (E)-2-HAL, (Z)-3-HOL, (E)-2-HOL, (Z)-3-HAC, β-PIN, β-MYR, and LIN. With the exception of (E)-2-HOL, β-MYR, LIN, BAC, β-CAR, the other VOCs were emitted in similar amounts by infected T. aestivum 3 days following stem and soil inoculation. The quantities of induced VOCs were higher at days 7 and 11 than at 3 days post-infection, and greater when T. aestivum was infected with Rhizoctonia on the stem base than through the soil.

Phytochemistry (Elsevier) published new progress about Anastomosis. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Related Products of esters-buliding-blocks.

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

Zhang, Jinglin published the artcileCharacterization of aroma-active compounds in Jasminum sambac concrete by aroma extract dilution analysis and odour activity value, Category: esters-buliding-blocks, the main research area is linalool cis3hexanyl acetate eugenol aroma active compound Jasminum.

Jasminum sambac is a flower and usually used in food, cosmetics or other chem. industries for its unique flavor characteristics in China. However, mol. sensory technologies have not applied to identify aroma-active compounds in J sambac concrete. In this study, gas chromatog.-olfactometry (GC-O), gas chromatog.-mass spectrometry and solvent-assisted flavor evaporation were applied to isolate the odorants in three Chinese J sambac concrete (E1, E2 and E3) obtained from different companies. A total of forty-nine, forty-eight, thirty-nine odorants were screened by GC-O with aroma extract dilution anal. in E1, E2 and E3, resp. The higher flavor dilution (FD) factors were linalool (19 683-59 049, floral), Me anthranilate (6561-19 683, grape-like) and benzyl acetate (2187-19 683, floral). Twenty-two aroma compounds were quantitated by gas chromatog.-flame ionization detection with internal standard, and then their odor activity values were obtained. Linalool, cis-3-hexenyl acetate, linalyl acetate, eugenol and Me salicylate contributed greatly to the aroma of J sambac concretes. The aroma recombination model was established by mixing twenty-two key odorants based on their measured concentrations, and the result revealed that the overall aroma profile was similar to that of the original sample. These results proved basic data for improvement of the national standard of jasmine concrete.

Flavour and Fragrance Journal published new progress about Anesthetics. 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

Heidari, Mahsa published the artcileDiscrimination between vegetable oil and animal fat by a metabolomics approach using gas chromatography-mass spectrometry combined with chemometrics, Safety of Methyl docosanoate, the main research area is vegetable oil fat gas chromatog mass spectrometry chemometrics metabolomics; Adulteration; Fatty acid methyl ester; Gas chromatography–mass spectrometry; Lard; Olive oil; Principal component analysis.

Adulteration of olive oil with the other cheap oils and fats plays an important role in economics and has nutritional benefits. In this work, metabolite profiling was performed using gas chromatog.-mass spectrometry to identify and quantify animal fat (lard) adulteration in vegetable oil (olive oil). Principal component anal. could correctly identify and clustering olive oil, sunflower oil, sesame oil, lard, and adulterated samples through the changes in their fatty acid Me esters (FAMEs) profile. A targeted metabolomics method was then optimized and validated through construction of calibration curves of known FAMSs in olive oil and lard. The method was presented high linearity (R2 > 0.96) and good intra and inter day accuracy and precision (79-101 and 86-102% and 2-7 and 3-7, resp.) for determination of FAMEs. Afterwards the absolute concentration and relative percentage of FAMEs were successfully determined in 12 com. olive oils and 3 lards samples. Me myristate, Me palmitate, Me oleate, and Me stearate were selected as discriminant markers to identify and quantify lard adulteration even at a low level of lard (5%weight/weight), with errors less than 2% in the comparison of the absolute or relative concentrations of FAMEs using several statistical methods. The proposed methodol. allowed us to quantify the FAMEs simultaneously and also could predict small amount of lard in the adulterated olive oil samples.

Journal of Food Science and Technology (New Delhi, India) published new progress about Animal fats. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Safety of Methyl docosanoate.

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

Dassanayake, Thiloka M. published the artcileAn aluminum lining to the dark cloud of silver resistance: harnessing the power of potent antimicrobial activity of γ-alumina nanoparticles, Formula: C24H14Cl2O7, the main research area is polyethylene glycol coated alumina nanoparticle antimicrobial Pseudomonas Staphylococcus.

Although a biol. nonessential element in living organisms, aluminum is notably nontoxic to eukaryotic cells and has a venerable history of medicinal use. We demonstrate that polyethylene glycol-coated γ-alumina nanoparticles (Al2O3-NPs) with an average size of 15 nm prepared from a com. bulk γ-alumina (γ-Al2O3) via the top-down sonication technique exhibit antibacterial activity that is comparable to that of AgNPs against both the Gram-neg. drug-susceptible Pseudomonas aeruginosa (DSPA) and multidrug-resistant Pseudomonas aeruginosa (DRPA) bacteria, while the antibacterial activity of such Al2O3-NPs considerably surpasses that of AgNPs against both the Gram-pos. methicillin-susceptible Staphylococcus aureus (DSSA) and methicillin-resistant Staphylococcus aureus (MRSA) bacteria. We also demonstrate that the DSPA bacteria sequentially exposed to Al2O3-NPs for 30 days show no indication of resistance development. Furthermore, such Al2O3-NPs can completely overcome the drug resistance developed in the conventional antibiotic ciprofloxacin-resistant and AgNP-resistant mutants without developing Al resistance.

Biomaterials Science published new progress about Antibiotics. 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

Ferreira, Victor H. C. published the artcileUse of color based chromatographic images obtained from comprehensive two-dimensional gas chromatography in authentication analyses, SDS of cas: 123-29-5, the main research area is color volatile organic compound two dimensional gas chromatog; Fingerprinting; Foodomics; Image processing; One-class classifiers; Solid-phase microextraction; Spirits.

Comprehensive two-dimensional gas chromatog. (GCxGC) has been an important technique used to acquire as much information as possible from a wide variety of samples. Qual. contour plots anal. provides useful information and in daily use it ends up being handled as images of the volatile organic compounds by analysts. Cachaca samples are used in this paper to showcase the use of two-dimensional chromatog. images as the main source for authentication purposes through one-class classifiers, such as data-driven soft independent modeling of class analogy (DD-SIMCA). The proposed workflow summarizes this fast and easy process, which can be used to certify a specific brand in comparison to other brands, as well as to authenticate if samples have been adulterated. Lower quality cachacas, non-aged cachacas and cachacas aged in different wooden barrels were tested as adulterants. Chromatog. images allowed for the distinction of all brands and nearly every adulteration tested. Sensitivity was estimated at 100% for all models and specificity ranged from 96% to 100%. Different approaches were used, alternating from working with whole-sized images to working with smaller resized versions of those images. Resized chromatog. images could be potentially useful to easily compensate for slight chromatog. misalignments, allowing for faster calculations and the use of simpler software. Reductions to 50% and 25% of the original size were tested and the results did not greatly differ from whole images model. As such, 2D chromatog. images have been found to be an interesting form of evaluating a product’s authenticity.

Talanta published new progress about Adulterants. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, SDS of cas: 123-29-5.

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