Month: December 2022

Moradi, Sasan published the artcileRemarkable thermal conductivity of epoxy composites filled with boron nitride and cured under pressure, SDS of cas: 7575-23-7, the main research area is boron nitride epoxy resin composite curing thermal conductivity; boron nitride; density; differential scanning calorimetry (DSC); epoxy composites; pressure; thermal conductivity.

This work demonstrates that the application of even moderate pressures during cure can result in a remarkable enhancement of the thermal conductivity of composites of epoxy and boron nitride (BN). Two systems have been used: epoxy-thiol and epoxy-diamine composites, filled with BN particles of different sizes and types: 2, 30 and 180μm platelets and 120μm agglomerates. Using measurements of d. and thermal conductivity, samples cured under pressures of 175 kPa and 2 MPa are compared with the same compositions cured at ambient pressure. The thermal conductivity increases for all samples cured under pressure, but the mechanism responsible depends on the composite system: For epoxy-diamine composites, the increase results principally from a reduction in the void content; for the epoxy-thiol system with BN platelets, the increase results from an improved matrix-particle interface; for the epoxy-thiol system with BN agglomerates, which has a thermal conductivity greater than 10 W/mK at 44.7 volume% filler content, the agglomerates are deformed to give a significantly increased area of contact. These results indicate that curing under pressure is an effective means of achieving high conductivity in epoxy-BN composites.

Polymers (Basel, Switzerland) published new progress about Density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, SDS of cas: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Fujii, Tatsuya published the artcileEffects of process parameters on vanillin partition coefficient in water-supercritical CO2 extraction, HPLC of Formula: 111-87-5, the main research area is vanillin supercritical carbon dioxide water extraction density.

Effects of temperature and pressure on supercritical CO2-water extraction of vanillin from its aqueous solution were investigated using a fast and continuous extraction and separation apparatus developed recently. Experiments were conducted under the temperature of 40-60°C and the pressure of 10.0-24.4 MPa. The partition coefficient of vanillin to supercritical CO2-rich phase decreased with increasing temperature at fixed pressures, while it increased with increasing pressure at fixed temperatures The anal. by va”t Hoff plot suggests that the values of enthalpy and entropy change in the process of mass transfer from water to supercritical CO2 under conditions investigated are constant and neg. This suggests that the partition process is enthalpy driven process, which is same as the mass transfer from water to 1-octanol. The natural logarithm of partition coefficients increased linearly with the natural logarithm of CO2 d. at fixed temperatures Since the natural logarithm of solubilities also increases linearly with the natural logarithm of CO2 d., the behavior of partition coefficient is considered to reflect the variation of vanillin solubility in supercritical CO2, which is also same as the partition process from water to 1-octanol.

Fluid Phase Equilibria published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, HPLC of Formula: 111-87-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Dhull, Sanju Bala published the artcileFunctional, thermal and rheological behavior of fenugreek (Trigonella foenum-graecum L.) gums from different cultivars: A comparative study, Category: alcohols-buliding-blocks, the main research area is Trigonella gum thermal rheol behavior; FTIR, rheology; Fenugreek gum; Shear thinning; Thermal properties.

Fenugreek gum (FG) was isolated from six different Indian fenugreek cultivars and studied for their functional, structural, thermal and rheol. attributes. The highest yield (13.5%) was observed for cultivar RMT-365. All galactomannans depicted good water and oil holding capacities ranging from 2009 ± 5.5 to 2099.9 ± 2.5% and 523.5 ± 3.5 to 553.0 ± 2.0%, resp. DSC thermograms of FG revealed the presence of one endothermic and one exothermic peak. For endothermic transition of gums from different cultivars, enthalpy change (Δ Ha) ranged from 234.2 to 351.8 J/g while for exothermic transition, Δ Ha values ranged from 72.0 to 102.1 J/g, much lower as compared with endothermic peak. The effect of variable shear rate on viscosity of 1% FG solutions showed their shear thinning behaviors for all the cultivars, whereby the viscosity decreased with increasing shear rate. Frequency sweep tests indicated typical viscoelastic fluid behavior for all the gum solutions Increase in the magnitude of G’ and G” of FG solutions was observed with an increase in frequency. A detailed understanding of different chem., functional and thermal properties of FG could surely enlarge the radius of its application and eventually aid in its utilization in different food, pharma and cosmetic products.

International Journal of Biological Macromolecules published new progress about Density. 59-23-4 belongs to class alcohols-buliding-blocks, name is (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, and the molecular formula is C6H12O6, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Antony, Fiona Mary published the artcileEfficacy of tri-n-octylamine, tri-n-butyl phosphate and di-(2-ethylhexyl) phosphoric acid for reactive separation of protocatechuic acid, Recommanded Product: n-Octanol, the main research area is octylamine butyl ethylhexyl phosphate protocatechuic acid reactive separation.

Owing to its chem. and pharmacol. significances, the efficacy of reactive separation of protocatechuic acid (0.001-0.01 kmol m-3) from aqueous stream by means of tri-n-octylamine (TOA), di-2-ethylhexyl phosphoric acid (D2EHPA) as well as tri-Bu phosphate (TBP) in octanol has been investigated, in terms of extraction efficiency, loading ratio, equilibrium complexation constants, and distribution coefficients Extraction ability was obtained in the order TOA (91.2%) > TBP (88.64%) > D2EHPA (86.43%). In all cases, 1:1 protocatechuic acid:extractant complex is obtained. Further, diffusion coefficients, number of stages for extraction systems, and relative basicity model were used for relating the efficacy.

Separation Science and Technology (Philadelphia, PA, United States) published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Recommanded Product: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kumar, Anuj published the artcileExtractive separation of levulinic acid using natural and chemical solvents, Name: n-Octanol, the main research area is extractive separation levulinic acid natural chem solvent.

Levulinic acid is an organic compound which has been replacing petroleum products in different sectors such as biofuel and chem. industry. It can be used in the manufacture of plastics, rubber, pharmaceuticals, pesticides, etc. Levulinic acid separation from aqueous streams, different types of solvents such as natural solvents (sunflower and groundnut oil), and various chem. solvents (benzene, iso-butanol, and iso-octanol) at 298.15 K were used. Using equilibrium data various parameters such as: efficiency of extraction, distribution coefficient, dimerization constant, and partition coefficient were calculated and correlated with typical physicochem. properties, mol. weight, d., dipole moment, viscosity, dielec. constant, solubility in water, octanol-water partition coefficient, refractive index, etc. The obtained exptl. extraction results for separation of levulinic acid were compared with various solvents used. The maximum value of distribution coefficient and efficiency of extraction of levulinic acid was obtained for iso-butanol (1.357, 57.276%) and min. value for sunflower oil (0.077, 7.086%) resp.

Chemical Data Collections published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Name: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Camacho Vergara, Edgar L. published the artcileOn the study of the vapor-liquid interface of associating fluids with classical density functional theory, SDS of cas: 111-87-5, the main research area is vapor liquid interface density functional theory.

Classical d. functional theory (DFT) is applied to study the vapor-liquid interface of associating fluids. Our classical DFT implementation uses a Helmholtz free energy functional that reduces to the perturbed-chain statistical associating fluid theory (PC-SAFT) equation of state in the bulk limit. We apply a new association functional, presented in one of our previous works, based on the weighted d. approximation to calculate the interfacial tension of associating fluids and compare them with two of the most used association functionals from literature. It is found that classical DFT with the three association functionals and the current mol. parameters of PC-SAFT is not able to predict satisfactorily the interfacial tension of alkanols. Therefore, the exptl. interfacial tension of alkanols and some associating fluids is included in the determination of the pure mol. parameters of PC-SAFT. With this approach the determination of interfacial tension of pure associating fluids can be greatly improved with the new parameters, but at the expense of slightly higher deviations in the vapor pressure. The new parameters are tested for the determination of vapor-liquid equilibrium (VLE) and the prediction of interfacial tension of binary mixtures containing at least one associating compound Good agreement is found between exptl. data of VLE and interfacial tension of the binary mixtures and the three association functionals. Furthermore, we discuss about the limitations and capabilities of the current classical DFT implementation in the study of the vapor-liquid interface of associating fluids.

Fluid Phase Equilibria published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, SDS of cas: 111-87-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Eriksen, Peter Lykke published the artcileNon-alcoholic fatty liver disease causes dissociated changes in metabolic liver functions, Synthetic Route of 59-23-4, the main research area is metabolism non alc fatty liver disease; Aminopyrine; Hepatic elimination; Indocyanine green; Liver function tests; Non-alcoholic steatohepatitis; Urea cycle.

Background: Non-alc. fatty liver disease (NAFLD) is a major health concern affecting 25% of the world’s population. It is generally held that a fatty liver does not influence liver function, but quant. measurements of metabolic liver functions have not been systematically performed. We aimed to study selected hepatocellular metabolic functions in patients with different stages of NAFLD. Methods: Twenty-five non-diabetic, biopsy-proven NAFLD patients [12 with simple steatosis; 13 with non-alc. steatohepatitis (NASH)] and ten healthy controls were included in a cross-sectional study. Hepatocyte cytosolic function was assessed by the galactose elimination capacity (GEC), mitochondrial-cytosolic metabolic capacity by the functional hepatic nitrogen clearance (FHNC), microsomal function by the aminopyrine breath test, and excretory liver function by indocyanine green (ICG) elimination. Results: GEC was 20% higher in NAFLD than in controls [3.15 mmol/min (2.9-3.41) vs. 2.62 (2.32-2.93); P = 0.02]. FHNC was 30% lower in NAFLD [23.3 L/h (18.7-28.9) vs. 33.1 (28.9-37.9); P = 0.04], more so in simple steatosis [19.1 L/h (13.9-26.2); P = 0.003] and non-significantly in NASH [27.9 L/h (20.6-37.8); P = 0.19]. Aminopyrine metabolism was 25% lower in simple steatosis [8.9% (7.0-10.7)] and 50% lower in NASH [6.0% (4.5-7.5)] than in controls [11.9% (9.3-12.8)] (P < 0.001). ICG elimination was intact. Conclusions: The hepatocellular metabolic functions were altered in a manner that was dissociated both by different effects on different liver functions and by different effects of different stages of NAFLD. Thus, NAFLD has widespread consequences for metabolic liver function, even in simple steatosis. Clinics and Research in Hepatology and Gastroenterology published new progress about Cytosol. 59-23-4 belongs to class alcohols-buliding-blocks, name is (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, and the molecular formula is C6H12O6, Synthetic Route of 59-23-4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Pasti, Alberto Pietro published the artcileHuman lactate dehydrogenase A undergoes allosteric transitions under pH conditions inducing the dissociation of the tetrameric enzyme, Safety of (S)-2-hydroxysuccinic acid, the main research area is human lactate dehydrogenase allosteric transition pH tetrameric enzyme; allosteric regulation; enzyme kinetics; lactate dehydrogenase; lactic acid; liver.

The aerobic energetic metabolism of eukaryotic cells relies on the glycolytic generation of pyruvate, which is subsequently channelled to the oxidative phosphorylation taking place in mitochondria. However, under conditions limiting oxidative phosphorylation, pyruvate is coupled to alternative energetic pathways, e.g. its reduction to lactate catalyzed by lactate dehydrogenases (LDHs). This biochem. process is known to induce a significant decrease in cytosolic pH, and is accordingly denoted lactic acidosis. Nevertheless, the mutual dependence of LDHs action and lactic acidosis is far from being fully understood. Using human LDH-A, here we show that when exposed to acidic pH this enzyme is subjected to homotropic allosteric transitions triggered by pyruvate. Conversely, human LDH-A features Michaelis-Menten kinetics at pH values equal to 7.0 or higher. Further, citrate, isocitrate, and malate were observed to activate human LDH-A, both at pH 5.0 and 6.5, with citrate and isocitrate being responsible for major effects. Dynamic light scattering (DLS) experiments revealed that the occurrence of allosteric kinetics in human LDH-A is mirrored by a consistent dissociation of the enzyme tetramer, suggesting that pyruvate promotes tetramer association under acidic conditions. Finally, using the human liver cancer cell line HepG2 we isolated cells featuring cytosolic pH equal to 7.3 or 6.5, and we observed a concomitant decrease in cytosolic pH and lactate secretion. Overall, our observations indicate the occurrence of a neg. feedback between lactic acidosis and human LDH-A activity, and a complex regulation of this feedback by pyruvate and by some intermediates of the Krebs cycle.

Bioscience Reports published new progress about Cytosol. 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, Safety of (S)-2-hydroxysuccinic acid.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kopuncova, Maria published the artcileAroma stability and sensory aspects of commercially produced orange juice: gas chromatography-olfactometry study, Category: alcohols-buliding-blocks, the main research area is orange juice aroma stability sensory aspect gas chromatog olfactometry.

The effects of pasteurization and 4-mo storage on the aroma profile of orange juices with pulp that were fully processed and packed in inert nitrogen atm. were investigated within the span of 2 years (2018 and 2019). Headspace solid-phase microextraction, gas chromatog.-mass spectrometry, as well as gas chromatog. coupled to flame ionization detection and olfactometry, were used for extraction, and subsequent anal. of the odor-active volatiles. Observed changes in their odor intensity, including the formation of some off-flavors such as methional, furaneol, 4-vinylguaiacol and guaiacol, were not significant to that extent to lead to an evident worsening in the overall flavor of juices. Thus, the use of nitrogen atm. proved its ability to protect the organoleptic quality of juice from undesirable changes caused by oxidative load or acid-catalyzed reactions. Aroma profiles of fresh juices were considerably influenced by diverse climatic conditions, and different seasons of orange harvest in monitored years. Pasteurization and storage had lesser impact on the volatiles in 2018 as in 2019, probably due to the inter-annual variability in such parameters of juices as content of pulp and pH.

Chemical Papers published new progress about Climate. 505-10-2 belongs to class alcohols-buliding-blocks, name is 3-(Methylthio)propan-1-ol, and the molecular formula is C4H10OS, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Hakamata, Yuki published the artcileDifferences in breast muscle mitochondrial respiratory capacity, reactive oxygen species generation, and complex characteristics between 7-week-old meat-and laying-type chickens, Quality Control of 97-67-6, the main research area is chicken meat reactive oxygen species breast muscle mitochondrial respiration; cardiolipin; carnitine palmitoyltransferase system; fatty acid oxidation; reactive oxygen species production; respiratory complex; respiratory supercomplex.

The skeletal muscle growth rate is a major feature differentiating meat- and laying-type chickens. A large amount of ATP is required during skeletal muscle synthesis, in which mitochondrial energy production capacities play a significant role. Addnl., mitochondria may participate in muscle protein degradation via reactive oxygen species generation. To investigate the differences in mitochondrial energetic characteristics between chickens exhibiting different growth rates, this study evaluated respiratory capacities in response to different types of respiratory substrate, protein abundances, assembly of individual respiratory complexes (I-V) and supercomplexes, and reactive oxygen species generation rates. These characteristics were compared between mitochondria from the breast muscle (M. pectoralis superficialis) of seven-week-old meat- and laying-type male chickens. Blue native polyacrylamide gel electrophoresis anal. revealed that meat-type chickens exhibited a significantly lower protein abundance of complex III (cytochrome bc1 complex), complex V (F0F1 ATP synthase), and total amount of supercomplexes than did laying-type chickens. There were no differences between chicken types in the respiration rate of mitochondria incubated with either pyruvate/malate or succinate, each of which drives complex I- and complex IIlinked respiration. Carnitine palmitoyltransferase-1-dependent and -independent respiration during ATP synthesis and carnitine palmitoyltransferase-2 enzymic activity were significantly lower in meat-type chickens than in layingtype chickens. For mitochondria receiving pyruvate/malate plus succinate, the reactive oxygen species generation rate and its ratio to the oxygen consumed (the percentage of free radical leak) were also significantly lower in meat-type chickens than in laying-type chickens. These results suggested that the mitochondrial energetic capacities of the breast muscle of meat-type chickens could be lower than those of laying-type chickens at seven weeks of age. Furthermore, the lower reactive oxygen species generation rate in meat-type chickens might have implications for rapid muscle development, which is possibly related to their lower muscle protein degradation rates.

Journal of Poultry Science published new progress about Chicken. 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, Quality Control of 97-67-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts