Tag: M.W=250-300

Zhang, Xiaokang; Li, Nana; Han, Sheng; Wei, Zhong; Dai, Bin published the artcile< Terpene resin prepared from renewable turpentine oil as a new type of cold flow improver for soybean biodiesel-diesel blends>, Application of C19H34O2, the main research area is terpene resin turpentine oil soybean biodiesel cold flow property.

The widespread use of biodiesel-diesel blends in society is one of the main ways to alleviate the global petrochem. energy shortage. Cold flow improvers (CFIs) can effectively improve the cold flow properties of biodiesel-diesel blends. Traditional CFIs are specific types of polymers synthesized from petrochem. products such as polymethacrylate, ethylene-vinyl acetate and poly alpha-olefin. To reduce the dependence on these non-renewable resources, terpene resin synthesized from renewable turpentine is used as a new type of CFI for biodiesel-diesel blends, and the effects of terpene resin on improving the cold flow properties of biodiesel-diesel blends are studied for the first time. The results indicate that the depression effects are extensively affected by the mol. weight of terpene resin, their addition amount and volume ratio of diesel and biodiesel in the blends. The terpene resin with an average mol. weight of 1212 presents the best depressive effect at the addition of 2000 ppm, and the cold filter plugging point (CFPP) of B30 (30 vol%. biodiesel + 70 vol%. diesel) decreases by 10 °C. Furthermore, using a differential scanning calorimeter, polarization optical microscope and rheol. anal., the paraffin crystallization and morphol. of wax crystals for diesel biodiesel-diesel blends before and after treatment with terpene resin are studied, and the mechanism of improving cold flow properties is discussed.

Fuel published new progress about Biodiesel fuel. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Application of C19H34O2.

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

Rotondano, Gianluca; Cipolletta, Livio; Grossi, Enzo; Koch, Maurizio; Intraligi, Marco; Buscema, Massimo; Marmo, Riccardo; Italian Registry on Upper Gastrointestinal Bleeding (Progetto Nazionale Emorragie Digestive) published the artcile< Artificial neural networks accurately predict mortality in patients with nonvariceal upper GI bleeding.>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is .

BACKGROUND: Risk stratification systems that accurately identify patients with a high risk for bleeding through the use of clinical predictors of mortality before endoscopic examination are needed. Computerized (artificial) neural networks (ANNs) are adaptive tools that may improve prognostication. OBJECTIVE: To assess the capability of an ANN to predict mortality in patients with nonvariceal upper GI bleeding and compare the predictive performance of the ANN with that of the Rockall score. DESIGN: Prospective, multicenter study. SETTING: Academic and community hospitals. PATIENTS: This study involved 2380 patients with nonvariceal upper GI bleeding. INTERVENTION: Upper GI endoscopy. MAIN OUTCOME MEASUREMENTS: The primary outcome variable was 30-day mortality, defined as any death occurring within 30 days of the index bleeding episode. Other outcome variables were recurrent bleeding and need for surgery. RESULTS: We performed analysis of certified outcomes of 2380 patients with nonvariceal upper GI bleeding. The Rockall score was compared with a supervised ANN (TWIST system, Semeion), adopting the same result validation protocol with random allocation of the sample in training and testing subsets and subsequent crossover. Overall, death occurred in 112 cases (4.70%). Of 68 pre-endoscopic input variables, 17 were selected and used by the ANN versus 16 included in the Rockall score. The sensitivity of the ANN-based model was 83.8% (76.7-90.8) versus 71.4% (62.8-80.0) for the Rockall score. Specificity was 97.5 (96.8-98.2) and 52.0 (49.8 4.2), respectively. Accuracy was 96.8% (96.0-97.5) versus 52.9% (50.8-55.0) (P<.001). The predictive performance of the ANN-based model for prediction of mortality was significantly superior to that of the complete Rockall score (area under the curve 0.95 [0.92-0.98] vs 0.67 [0.65-0.69]; P<.001). LIMITATIONS: External validation on a subsequent independent population is needed, patients with variceal bleeding and obscure GI hemorrhage are excluded. CONCLUSION: In patients with nonvariceal upper GI bleeding, ANNs are significantly superior to the Rockall score in predicting the risk of death. Gastrointestinal endoscopy published new progress about 112-63-0. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Song, Zhihua; Liu, Jinqiu; Zhang, Deyang; Wang, Yumeng; Lin, Wen; Bi, Yi; Wang, Hongbo; Arabi, Maryam; Li, Jinhua; Ma, Jiping; Wang, Yan; Chen, Lingxin published the artcile< Synthesis of C8F13-SiO2 stationary phase for chromatographic separation of highly polar compounds>, Application In Synthesis of 112-63-0, the main research area is perfluorooctyltriethoxysilanesilica stationary phase chromatog property.

Up to now, the chromatog. separation and anal. of highly polar compounds are still challenging because of low retention ability and selectivity of conventional stationary phases (SPs). Developing new SPs to achieve high-resolution and high-efficiency separation of polar compounds is of great importance for health and medicine, food safety, environmental protection, etc.. Herein, an influential multi-step modification strategy (modification with 1H,1H,2H,2H-perfluorooctyltriethoxysilane on the silica twice and end-capped with trimethylchlorosilane once) is introduced to prepare C8F13-SiO2 SP. The phys. properties of C8F13-SiO2 SP, including morphologies, pore structures and carbon content were fully characterized by various instrumental techniques. The packed HPLC column with C8F13-SiO2 SP exhibited high column efficiency, good peak shape (tailing factors for most analytes are between 0.9 and 1.3), and resolution for simultaneous separation of ginsenosides, sulfonamides, nucleosides, and benzoylurea insecticides (BUs); meanwhile, the retention mechanism of typical reversed-phase liquid chromatog. (RPLC) mode was observed A column efficiency of 30,220 plates/m for separation of ginsenoside Re was obtained. Furthermore, the resulting columns benefit from the advantages of supreme reproducibility, repeatability and stability. Importantly, the chromatog. properties (e.g. column efficiencies, chromatog. peak shapes, retention ability and resolution) of the C8F13-SiO2 SP for the polar analytes were superior to those of the com. SPs (including com. amino-modified silica SP, diol-modified silica SP and com. PFP-SiO2 SP). Thus, the C8F13-SiO2 SP is able to satisfy the strict requirements of highly polar compounds separation

Microchemical Journal published new progress about Particle size. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Application In Synthesis of 112-63-0.

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

Dai, Wang-Ying; Luo, Zong-Ping published the artcile< Paeoniflorin inhibits pyroptosis of nucleus pulposus cells in an acidic environment and alleviates the degeneration of the intervertebral disc in rats>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is intervertebral disk paeoniflorin pyroptosis nucleus pulposus cell.

Paeoniflorin inhibits pyroptosis of nucleus pulposus cells in an acidic environment and alleviates the degeneration of the intervertebral disk in rats. PF improves MRI T2-weighted phase parameters of intervertebral disk degeneration caused by puncture. PF attenuates matrix degradation and lactic acid accumulation during intervertebral disk degeneration caused by puncture. The protein expressions of collagen II, aggrecan, MMP3, and MMP13 in the intervertebral disks of the three groups of rats were detected by immunohistochem. at 2 wk postoperatively. Semi-quant. immunohistochem. anal. of collagen II, aggrecan, MMP3, and MMP13. Lactic acid content in the intervertebral disks of rats from the three exptl. groups of at 2 wk post-surgery as determined by ELISA. In this study, the intracellular calcium level in NPCs was significantly reduced by PF treatment; thus, the attenuation of pyroptosis by PF may be related to its inhibitory effect on intracellular calcium level. Based on this, channels that regulate intracellular calcium concentration in acidic environments may become therapeutic targets. PF reduced the intracellular calcium level, inhibited pyroptosis of NPCs, and delayed IVDD.

Cellular Signalling published new progress about Acid-sensing ion channel ASIC1a Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Lee, Pui Lap Jacob; Thangavel, Vigneshwaran; Guery, Claude; Trautmann, Christina; Toimil-Molares, Maria Eugenia; Morcrette, Mathieu published the artcile< Etched ion-track membranes as tailored separators in Li-S batteries>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is lithium sulfur ion track membrane battery separator; PET; battery separator; etched ion track membrane; lithium–sulfur battery; polyethylene terephthalate; polysulfide redox shuttle.

Lithium-sulfur (Li-S) batteries are considered a promising next generation alternative to lithium-ion batteries for energy storage systems due to its high energy d. However, several challenges, such as the polysulfide redox shuttle causing self-discharge of the battery, remain unresolved. In this paper, we explore the use of polymer etched ion-track membranes as separators in Li-S batteries to mitigate the redox shuttle effect. Compared to com. separators, their unique advantages lie in their very narrow pore size distribution, and the possibility to tailor and optimize the d., geometry, and diameter of the nanopores in an independent manner. Various polyethylene terephthalate membranes with diameters between 22 and 198 nm and different porosities were successfully integrated into Li-S coin cells. The reported coulombic efficiency of up to 97% with minor reduction in capacity opens a pathway to potentially address the polysulfide redox shuttle in Li-S batteries using tailored membranes.

Nanotechnology published new progress about Battery anodes. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Yu, Huijuan; Chai, Xin; Geng, Wen-Chao; Zhang, Lei; Ding, Fei; Guo, Dong-Sheng; Wang, Yuefei published the artcile< Facile and label-free fluorescence strategy for evaluating the influence of bioactive ingredients on FMO3 activity via supramolecular host-guest reporter pair>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is fluorescence strategy bioactive ingredient flavin monooxygenase trimethylamine Noxide; Flavin monooxygenase 3; Host-guest chemistry; Indicator displacement assay; Supramolecular sensing; Xuefu Zhuyu decoction.

Screening inhibitors of flavin monooxygenase 3 (FMO3) is very important for treating trimethylamine N-oxide (TMAO) derived thrombotic diseases. Herein, focusing on Xuefu Zhuyu decoction (XFZYD) as a Chinese traditional medicine with antithrombotic efficacy, a facile and label-free fluorescence strategy was developed for evaluating the influence of the bioactive ingredients in XFZYD on FMO3 activity through indicator displacement assay. To this end, the optimized supramol. host-guest (p-sulfonatocalix[4]arene-oxazine 1) reporter pair and FMO3 catalytic system were exploited to determine the influence of the bioactive compounds in XFZYD on the conversion from TMA to TMAO. From the nine compounds tested, naringin, paeoniflorin, β-ecdysterone, 18β-glycyrrhizic acid, amygdalin, albiflorin, and saikosaponin A downregulated FMO3 activity and reduced TMAO biosynthesis. Moreover, mol. docking was successfully applied to simulate the optimal conformation of a receptor-ligand complex between FMO3 and all tested compounds except for β-ecdysterone. Therefore, this approach provides a novel and promising strategy for screening FMO3 inhibitors from Chinese traditional medicine by supramol. sensing.

Biosensors & Bioelectronics published new progress about Antithrombotics. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Khalaj, A.; Rastegi, H. R.; Jorjani, M. published the artcile< Synthesis and muscle relaxant activity of two analogs of dantrolene sodium in mice>, Quality Control of 112-63-0, the main research area is dantrolene sodium analog preparation muscle relaxant structure.

Dantrolene sodium (I) is a skeletal muscle relaxant that is known to act by preventing the release of calcium ions from the sarcoplasmic reticulum. Structure-activity studies of I have been limited to changes in the position or the nature of the nitro group, and replacement of the 4-nitrobenzene, furan, and hydantoin moieties with other rings, usually resulting in compounds with reduced or no activity. To investigate the influence of similarities in the electronic transmission ability of the furan nucleus of 5-aryl, 5-arylthio and 5-styryl-2-furancarboxaldehydes on biol. activity, two corresponding analogs of I were prepared by the reaction of the resp. aldehydes with 1-aminohydantoin and were evaluated by the rota-rod test in mice. Compared with I as standard, 1-[[[[5-(4-nitrobenzene)thio]-2-furanyl]-methylene]amino]-2,4-imidazolidinedione exhibited higher activity, and 1-[[[[5-(4-nitrobenzene)ethenyl]-2-furanyl]-methylene]amino]-2,4-imidazolidinedione showed comparable activity at 0·5, 3 and 6 h after administration to mice. There is a correlation between the electronic transmission ability of the furan nucleus in all 3 compounds and muscle relaxant activity.

Pharmacy and Pharmacology Communications published new progress about Muscle relaxants. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Quality Control of 112-63-0.

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

Miao, Pengcheng; Leng, Xuefei; Liu, Jie; Song, Guanjun; He, Maomao; Li, Yang published the artcile< Regulating the Dynamic Behaviors of Transcarbamoylation-Based Vitrimers via Mono-Variation in Density of Exchangeable Hydroxyl>, Related Products of 112-63-0, the main research area is dynamic behavior transcarbamoylation vitrimer.

The dynamic behaviors of vitrimer are influenced by the interaction of crosslink d. and d. of exchangeable groups, which results in the difficulty of extracting the effect of mono-variation. In this study, the dynamic behaviors of vitrimer were tuned by changing the d. of exchangeable hydroxyls alone, while leaving the crosslink d. undisturbed. A multi-hydroxy vitrimer network without a loading catalyst was synthesized successfully. Three-armed functionalized polycarbonate, obtained by ring-opening polymerization of 1,3-dioxan-2-one and its derivatives, was treated as a precursor polymer. Afterward, the precursor polymer was converted into vitrimer in a single step by treatment with hexamethylene diisocyanate. When the system with constant crosslink d. was established, the accurate effect of the hydroxyl d. on the dynamic behaviors could be characterized by stress relaxation. The relationship of essential dynamic behavioral parameters, such as topol. freezing transition temperature (Tv), exchange activation energy (Ea), and Arrhenius prefactor (τ0), with the d. of exchangeable hydroxyls was quant. discussed. The results indicated that Tv and Ea were neg. correlated with the d. of exchangeable hydroxyls, while τ0 showed a pos. correlation. In addition, linear models were developed to describe the relationship between dynamic behaviors of vitrimer and d. of exchangeable hydroxyls. It is expected that the findings can be applied to precisely control Ea, τ0, Tv, and characteristic relaxation time (τ*) of vitrimer and can also be used as a model for the synthesis of various vitrimer materials.

Macromolecules (Washington, DC, United States) published new progress about Activated charcoal Role: CAT (Catalyst Use), USES (Uses). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

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

Klein, Robert S.; Lim, Mu-Ill; Tam, Steve Y. K.; Fox, Jack J. published the artcile< New synthesis of 5H-pyrrolo[3,2-d]pyrimidines via pyrimido[5,4-c]pyridazines>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is pyrrolopyrimidinedione; pyrimidopyridazine ring contraction; pyrimidine phenylazo formylation cyclization; cyclization formylphenylazopyrimidine.

5H-pyrrolo[3,2-d]pyrimidines I and II (R = Me2N, H2N) were prepared from 6-methyl-5-phenylazopyrimidines by conversion to intermediate pyrimido[[[5,4-c]pyridazines, e.g. III, by treatment with formylating agents such as tert-butoxybis(dimethylamino)methane. Hydrogenolytic ring contractions then give I or II; other methods for this preparation were given.

Journal of Organic Chemistry published new progress about Cyclocondensation reaction. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Sayama, Shinsei; Onami, Tetsuo published the artcile< Esterification of aldehydes and alcohols with pyridinium hydrobromide perbromide in water>, Related Products of 112-63-0, the main research area is aldehyde alc esterification pyridinium hydrobromide perbromide water; ester preparation; pyridinium hydrobromide perbromide esterification mediator; water esterification solvent.

The direct esterification of aldehydes and alcs. was carried out with pyridinium hydrobromide perbromide in water at room temperature A variety of aldehydes were converted to resp. ester derivatives with alcs. such as methanol, 1,2-ethanediol, 1,3-propanediol. Further, a variety of aliphatic alcs. were also converted to the corresponding Tishchenko-like dimeric esters in good yields under the same reaction conditions.

Synlett published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

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