Tag: M.W=300-350

Zhou, Jiahui published the artcileRobust Poly(urethane-amide) Protective Film with Fast Self-Healing at Room Temperature, Name: 2,2′-Dithiodibenzoic acid, the publication is ACS Applied Polymer Materials (2020), 2(2), 285-294, database is CAplus.

Simultaneous optimization of the mech. strength and self-healing cycles of polymers at ambient temperature has long been considered a great challenge because it is difficult to strike a balance between intermol. interactions and segment/chain mobility. Here, we synthesized a unique class of amide-based polyurethanes incorporated with an unreported low-cost carboxylic-acid-type aromatic disulfide, which exhibits an amazing integration of mech. robustness and fast self-healing ability, and a ready healing efficiency of 98% can be achieved when healed for only 30 s at ambient temperature, as calculated using Young’s modulus (pristine: 59.4 MPa). As a result of hierarchical structure tuning, the target poly(urethane-amide) exhibits relatively fast segment movements but slow chain diffusion dynamics, thus facilitating rapid recombination of H-bonding as well as disulfide metathesis between fractured surfaces with a small degree of both microphase separation and crystallization This easily processable poly(urethane-amide) has the potential to be widely used in various industries as a high value-added film.

ACS Applied Polymer Materials published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C44H28ClFeN4, Name: 2,2′-Dithiodibenzoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Feng, Zhen published the artcileTwo-dimensional metal-organic framework Mo₃(C₂O)₁₂ as a promising single-atom catalyst for selective nitrogen-to-ammonia conversion, Recommanded Product: Coronene, the publication is Journal of Materials Chemistry A: Materials for Energy and Sustainability (2022), 10(9), 4731-4738, database is CAplus.

The development of single-atom catalysts (SACs) for the electrocatalytic nitrogen reduction reaction (NRR) remains a great challenge. Using d. functional theory calculations, we design a new family of two-dimensional metal-organic frameworks [TM₃(C₂O)₁₂, TM = Sc-Au] and explore their feasibility as SACs for the NRR. The calculated adsorption Gibbs free energies of N₂ and NNH species demonstrate that only the Mo₃(C₂O)₁₂ monolayer could both activate the NN bond and stabilize the adsorbed NNH intermediate. The Mo₃(C₂O)₁₂ metal-organic framework not only possesses sufficient stability, but also exhibits high nitrogen fixation activity and substantial selectivity. The NRR distal pathway could achieve this sufficient goal with a low limiting potential of -0.36 V and a promising theor. faradaic efficiency value of 100%. This work could give guidance to develop more effective NRR SACs using 2D metal-organic frameworks under ambient conditions.

Journal of Materials Chemistry A: Materials for Energy and Sustainability published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, Recommanded Product: Coronene.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Li, Dong published the artcileThallium(I and III) exposure leads to liver damage and disorders of fatty acid metabolism in mice, Formula: C22H32O2, the publication is Chemosphere (2022), 307(Part_1), 135618, database is CAplus and MEDLINE.

Thallium (Tl), a highly toxic and priority pollutant heavy metal, exposure can damage mitochondria and disrupt their function. The liver is the central organ that controls lipid homeostasis and contains a large number of mitochondria. So far, there is no study investigating the effects of Tl exposure on hepatic fatty acid metabolism Here, we showed that 10 ppm of Tl(I) and Tl(III) exposures for two weeks did not significantly affect the body weight and water/food intake in mice. However, it decreased the ratio of liver/weight and induced hepatic sinus congestion and hepatocyte necrosis. Inductively coupled plasma-mass spectrometry (ICP-MS) anal. revealed Tl accumulation in the liver. Gas chromatog.-mass spectrometry (GC-MS) results showed that Tl(I) exposure significantly increased hepatic C18:0 concentration, while significantly decreased the concentrations of C16:1n-7, C20:1n-9, C18:3n-6, and C20:2n-9. Tl(III) exposure significantly reduced hepatic concentrations of C20:0, C22:0, C20:1n-9, C18:3n-6, and C20:3n-6. In addition, Tl(I) exposure upregulated the genes related to antioxidation (HO-1, GPX1, and GPX4), fatty acid synthesis (FADS2 and Elovl2), and fatty acid oxidation pathway (PPAR¦Á, ACADM, ACADVL, ACAA2, and CPT1A) in the liver. Tl(III) exposure did not significantly affect the transcript levels of liver antioxidative/metabolic enzymes and fatty acid synthesis-related genes, but upregulated fatty acid oxidation pathway-related genes (CYP4A10 and CPT1A). These results suggest that Tl(I) and Tl(III) exposures can cause liver damage and disrupt hepatic fatty acid metabolism, which provide new insights into Tl exposure-induced energy depletion from the perspective of fatty acid metabolism

Chemosphere published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C22H32O2, Formula: C22H32O2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Gul, Iram published the artcilePermeability of boron- and nitrogen-doped graphene nanoflakes for protium/deuterium ions, Safety of Coronene, the publication is RSC Advances (2022), 12(7), 3883-3891, database is CAplus and MEDLINE.

Two-dimensional (2D) monolayer nanomaterials are the thinnest possible membranes with interesting selective permeation characteristics. Among two-dimensional materials, graphenes and hexagonal boron nitride (h-BN) are the most promising membrane materials, which can even allow the separation of proton isotopes. The current work aims at understanding the higher reported permeability of h-BN by sequential doping of B and N atoms in graphene nanoflakes. The kinetic barriers were calculated with two different models of graphenes; coronene and dodecabenzocoronene via zero-point energy calculations at the transition state for proton permeability. The lower barriers for h-BN are mainly due to boron atoms. The trends of kinetic barriers are B < BN < N-doped graphenes. The permeation selectivity of graphene models increases with doping. Our studies suggest that boron-doped graphene models show an energy barrier of 0.04 eV for the permeation of proton, much lower than that of the model graphene and h-BN sheet, while nitrogen-doped graphenes have a very high energy barrier up to 7.44 eV for permeation. Therefore, boron-doped graphene models are suitable candidates for proton permeation. Moreover, the presence of carbon atoms in the periphery of BN sheets has significant neg. effects on the permeation of proton isotopes, an unexplored dimension of the remote neighboring effect in 2-D materials. This study illustrates the need for permeation study through other hetero-2D surfaces, where interesting hidden chem. is still unexplored.

RSC Advances published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, Safety of Coronene.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Caumo, Sofia published the artcileParticulate matter-bound organic compounds: levels, mutagenicity, and health risks, SDS of cas: 191-07-1, the publication is Environmental Science and Pollution Research (2022), 29(21), 31293-31310, database is CAplus and MEDLINE.

Increased industrialization and consumption of fossil fuels in the Metropolitan Region of SaoPaulo (MRSP), Brazil, have caused a growth of the particulate matter emissions to the atm. and an increase in population health problems. Particulate and gaseous phase samples were collected in different short campaigns (2015, 2016, and 2017) near an urban-industrial area. Organic carbon (OC), elemental carbon (EC), polycyclic aromatic hydrocarbons (PAH), and its derivatives (nitro and oxy-PAH), n-alkanes, hopanes, and pesticides were determined The Salmonella/microsome test confirmed the mutagenic activity of these samples. Among PAH, benzo(a)pyrene was detected as one of the most abundant compounds Benzo(a)pyrene equivalent concentrations for PAH and nitro-PAH, and the associated risk of lung cancer, showed values above those recommended in the literature. The profile of n-alkanes confirmed the predominance of anthropogenic sources. Pesticide concentrations and estimated risks, such as the daily inhalation exposure and hazard quotient, suggest that exposure to these compounds in this area may be dangerous to human health.

Environmental Science and Pollution Research published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, SDS of cas: 191-07-1.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Pei, Xue-Chen published the artcileEffects of different antioxidants and their combinations on the oxidative stability of DHA algae oil and walnut oil, Application In Synthesis of 6217-54-5, the publication is Food Science & Nutrition (Hoboken, NJ, United States) (2022), 10(8), 2804-2812, database is CAplus and MEDLINE.

Through monitoring Rancimat induction time (RIT), peroxide value (POV), and thiobarbituric acid-reactive substances (TBARS) of docosahexaenoic acid (DHA) algae oil and walnut oil during accelerated storage, the effects of the single and the combinations of seven kinds of antioxidants involving ascorbyl palmitate (AP), phytic acid (PA), vitamin E (VE), antioxidant of bamboo leaves (AOB), rosemary extract, tea polyphenols (TP), and tea polyphenol palmitate (TPP) against lipid oxidation were evaluated. RIT, POV, and TBARS results showed that the DHA algae oil sample containing 600 mg/kg TPP revealed the strongest stability and the walnut oil sample containing 450 mg/kg TPP and 100 mg/kg TP revealed the strongest stability. Then, the shelf lives of two oils were predicted from the extrapolation of the linear regression model between Log RIT and temperature Our results indicated that the optimal antioxidant could prolong the shelf lives of DHA algae oil and walnut oil by 2.31- and 7.74-fold, resp.

Food Science & Nutrition (Hoboken, NJ, United States) published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C22H32O2, Application In Synthesis of 6217-54-5.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Wang, Guo-Qiao published the artcileConformational Transition-Triggered Disassembly of Therapeutic Peptide Nanomedicine for Tumor Therapy, Safety of Fmoc-Pro-OH, the publication is Advanced Healthcare Materials (2021), 10(24), 2100333, database is CAplus and MEDLINE.

Cationic therapeutic peptides have received widespread attention due to their excellent antibacterial and antitumor properties. However, most of these peptides have undesirable delivery efficiency and high hemolytic toxicity due to the pos. charged ¦Á-helix structure containing many lysine and arginine, which may restrict its in vivo applications. Herein, a conformationally transformed therapeutic peptide Pep-HCO₃ modified with bicarbonates on guanidine groups is designed. Such a design allows Pep-HCO₃ ((nap-RAGLQFPVGRLLRRLLRRLLR) nHCO₃) to self-assemble into nanoparticles (NP-Pep) due to disrupting helix folding and the formation of intermol. hydrogen bonding between bicarbonates and guanidine groups. When pH is from 7.4 to 6.5 at the tumor sites, guanidine bicarbonate can be hydrolyzed to form CO₂ and guanidine groups, resulting in the disassembling of the NP-Pep into monomers ¦Á-Pep with a pos. charged ¦Á-helix structure. In vivo, NP-Pep not only inhibits the tumor growth of xenografted mice with a twofold enhanced inhibition rate compared with ¦Á-Pep treatment group, but also significantly reduces the hemolytic toxicity by responding to the pH of tumor microenvironment. Therefore, the strategy of conformational transition-triggered disassembly of nanoparticles allows efficient delivery of cationic therapeutic peptides and lowering the hemolytic toxicity, which may provide an avenue for developing high-performance cationic peptide in vivo applications.

Advanced Healthcare Materials published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H17FO4S, Safety of Fmoc-Pro-OH.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhang, Qijun published the artcilePM_2.5-PAHs and PM₁₀-PAHs at roadside environment: levels, meteorological impact, source apportionment, and health risks, Recommanded Product: Coronene, the publication is Air Quality, Atmosphere & Health (2022), 15(7), 1287-1301, database is CAplus.

Polycyclic aromatic hydrocarbon (PAH) concentrations in PM₁₀ and PM_2.5 were measured at the roadside of 4 typical urban roads in Tianjin from Jan. to August 2015. The medium flow samplers with pretreated quartz filters were used for particulate matter sampling. Eighteen PAHs were analyzed by gas chromatog.-mass spectrometry. The concentrations of PM_2.5-PAHs and PM₁₀-PAHs in winter were 74.98 ng/m³ and 94.22 ng/m³, followed by spring and the lowest in summer. The traffic flow is pos. correlated with benzo(a)pyrene, benzo(g,h,i)perylene, and coronene. The vehicle speed and temperature are significantly pos. correlated with low-ring polycyclic aromatic hydrocarbons and neg. correlated with the middle- and high-cyclic aromatic hydrocarbons. The ratio anal. of some PM_2.5-PAHs and PM₁₀-PAHs suggests that gasoline and diesel vehicles were the major sources of the studied area. Industrial emission, vehicle exhaust, and vehicle non-exhaust (tire wear, brake pad wear, and road dust) were identified as the major sources of roadside PAHs using pos. matrix factorization anal. The incremental lifetime cancer risk of ingestion and dermal contact were higher than that of inhalation, indicating that ingestion and dermal contact were the primary exposure routes for cancer. Therefore, it is necessary to take measures to strictly control the PM-PAHs pollution emitted by motor vehicles and formulate standards for PM-PAHs emitted by vehicles.

Air Quality, Atmosphere & Health published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C10H16O2, Recommanded Product: Coronene.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Weigand, Miranda R. published the artcileEnhancement of lipid signals with ammonium fluoride in negative mode Nano-DESI mass spectrometry imaging, Name: Docosahexaenoic Acid, the publication is International Journal of Mass Spectrometry (2022), 116859, database is CAplus.

Lipids play an important role in biol. Their structural diversity presents challenges for untargeted mass spectrometry imaging (MSI) and anal. techniques. Enhancing the lipid coverage of MSI experiments is an important step to understanding their role in biol. processes. Herein, we use nanospray desorption electrospray ionization mass spectrometry imaging (nano-DESI MSI) to explore the effect of ammonium fluoride (NH4F) as a solvent additive for enhanced detection of lipids in biol. tissues. Although fatty acids and phospholipids are readily observed in nano-DESI MSI, other lipid classes are difficult to detect due to their low abundance and low ionization efficiency. We have evaluated enhancement factors of lipids in neg. ionization mode in the presence of NH4F in the nano-DESI solvent. We observed a 10-110-fold enhancement in lipid signals detected as [M – H]- ions using 500¦ÌM NH4F in 9:1 methanol:water in comparison with 9:1 methanol:water, which is typically used in nano-DESI MSI experiments The observed signal enhancement is attributed to the efficient proton abstraction from lipids by F-. The enhancement factors observed for fatty acids are correlated to their interfacial pKa values. The optimized solvent composition enables sensitive imaging of both high- and low-abundance lipids without any adverse effect on the noise level. Overall, our results demonstrate a substantial improvement in sensitivity of nano-DESI MSI of lipids in biol. tissues when NH4F is added to the nano-DESI solvent.

International Journal of Mass Spectrometry published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C8H15NO, Name: Docosahexaenoic Acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Sun, Xue-Jie published the artcileElectrochemically Oxidative Coupling of S-H/S-H for S-S Bond Formation: A Facile Approach to Diacid-disulfides, COA of Formula: C14H10O4S2, the publication is ChemistrySelect (2020), 5(15), 4637-4641, database is CAplus.

A green electrochem. method of preparing diacid-disulfides was developed, in which an S-S bond was formed by electrochem. oxidative coupling of S-H/S-H employing redox active NaI as mediator. The reactions were carried out in a simple undivided cell under constant current condition at room temperature and completed in 1.3 h to afford a series of diacid-disulfides with up to 97% yields.

ChemistrySelect published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C4Br2N2O4S, COA of Formula: C14H10O4S2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia