Tag: M.W=250-300

Tong, Ning-Ning; Zhou, Xiao-Yang; Peng, Li-Ping; Liu, Zheng-An; Shu, Qing-Yan published the artcile< A comprehensive study of three species of Paeonia stem and leaf phytochemicals, and their antioxidant activities>, Application In Synthesis of 112-63-0, the main research area is paeoniflorin antioxidant Paeonia; Antioxidant activity; Medicinal plants; Monoterpene glycosides; Paeonia; Paeoniflorin.

Paeonia plants have been widely used as traditional Chinese medicinal materials for more than 2,000 years in the treatment of cardiovascular, extravasated blood and female genital diseases; paeoniflorin and paeonol have been implicated as the plants primary active ingredients. Previous studies have been singularly focused on the chem. constituents and content variation of the Paeonia roots in the advancement of traditional Chinese medicine, with the plants stems and leaves considered useless. This study aims to explore the chem. constituents, content variation, and antioxidant capacity in Paeonia stems and leaves for the future utilization of traditional Chinese medicine, given that current practices of digging and trade endanger Paeonia in the wild. Herein, secondary metabolites from the stems and leaves from six developmental stages of the annual growth cycle of Paeonia ostii T. Hong & J. X. Zhang, P. Hexie, and P. lactiflora Pall. were qual. and quant. analyzed via high-performance liquid chromatog. with a diode array detector (HPLC-DAD) and high-performance liquid chromatog. quadrupole time-of-flight mass spectrometry (HPLC-Q-TOF-MS). Antioxidant capacity at each stage was also evaluated by various free radical scavenging assays. A total of 24 metabolites were detected and identified, including 5 monoterpene glycosides, 4 tannins, 5 phenols, 9 flavonoids, and paeonol. Excepting paeonol and the phenols, the levels of each metabolite category were significantly higher in the leaves than the stems during all developmental stages. The paeoniflorin content in the P. ostii leaves was the highest during the first developmental stage and higher than the standards of the Chinese Pharmacopoeia, suggesting it to be the optimal harvesting stage for medicinal uses. Notably, the antioxidant capacity of the leaves was significantly greater than in the stems, particularly for the leaves of P. Hexie. Our study indicates that the leaves of P. Hexie have the potential to be a worthy medicinal substitute to Paeonia roots due to their high monoterpene glycosides, phenols, and flavonoids as well as their strong antioxidant capacity. Further, this study provides a theor. basis for the development and utilization of non-root Paeonia plant sections as medicinal plant resources.

Journal of Ethnopharmacology published new progress about Antioxidant enzymes Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

Ding, Pei-Gang; Zhou, Feng; Wang, Xin; Zhao, Qiu-Hua; Yu, Jin-Sheng; Zhou, Jian published the artcile< H-bond donor-directed switching of diastereoselectivity in the Michael addition of α-azido ketones to nitroolefins>, SDS of cas: 112-63-0, the main research area is nitroalkene azido ketone bifunctional chiral amide catalyst Michael addition; azido nitroalkanone preparation diastereoselective enantioselective.

The potency of H-bond donors as the governing factor to tune diastereoselectivity in a highly diastereoselective switchable enantioselective Michael addition of α-azido ketones to nitroolefins was reported. While a newly developed bifunctional tertiary amine, phosphoramide, preferentially afforded syn-adducts, an analogous squaramide catalyst selectively gave anti-adducts. The resulting multifunctional tertiary azides were converted to spiro-pyrrolidines with four continuous stereocenters in a one-pot operation. Mechanistic studies casted light on the control of diastereoselectivity by H-bond donors. While the squaramide-catalyzed reaction proceeded with a transition state with both squaramide N-H bonds binding to an enolate intermediate, an unprecedented model was proposed for the phosphoramide-mediated reaction wherein an amide N-H bond and an alkylammonium ion formed in-situ interacted with nitroolefins, with the enolate stabilized by non-classical C-H···O hydrogen-bonding interactions.

Chemical Science published new progress about Alkanes, nitro Role: PRP (Properties), RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

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

Catalan, Javier; De Paz, Jose Luis G.; Yanez, Manuel; Elguero, Jose published the artcile< The azoles: a theoretical study>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is MO azole; protonation azole; dipole moment azole; tautomerism azole.

Ab initio calculations were reported for 35 azoles (neutral mols. and protonated azolium salts) based on INDO optimized geometries. Calculated dipole moments agreed with measured values. Protonation sites (most basic N atoms) were determined from calculated protonation energies and N lone pair changes. Linear relations between exptl. aqueous basicity and calculated protonation energies for N-methylazoles and between exptl. aqueous acidity for N-unsubstituted azoles and the charge of the NH H atom, were observed Tautomerism of the triazoles and tetrazoles were discussed.

Chemica Scripta published new progress about Acidity. 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

Auld, Andrew F.; Agizew, Tefera; Mathoma, Anikie; Boyd, Rosanna; Date, Anand; Pals, Sherri L.; Serumola, Christopher; Mathebula, Unami; Alexander, Heather; Ellerbrock, Tedd V.; Rankgoane-Pono, Goabaone; Pono, Pontsho; Shepherd, James C.; Fielding, Katherine; Grant, Alison D.; Finlay, Alyssa published the artcile< Effect of tuberculosis screening and retention interventions on early antiretroviral therapy mortality in Botswana: a stepped-wedge cluster randomized trial>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is efavirenz emtricitabine nevirapine ritonavir antiretroviral agent tuberculosis; Intensified tuberculosis case finding; Mortality; Tuberculosis; Xpert MTB/RIF.

Undiagnosed tuberculosis (TB) remains the most common cause of HIV-related mortality. Xpert MTB/RIF (Xpert) is being rolled out globally to improve TB diagnostic capacity. However, previous Xpert impact trials have reported that health system weaknesses blunted impact of this improved diagnostic tool. During phased Xpert rollout in Botswana, we evaluated the impact of a package of interventions comprising (1) addnl. support for intensified TB case finding (ICF), (2) active tracing for patients missing clinic appointments to support retention, and (3) Xpert replacing sputum-smear microscopy, on early (6-mo) antiretroviral therapy (ART) mortality. At 22 clinics, ART enrollees > 12 years old were eligible for inclusion in three phases: a retrospective standard of care (SOC), prospective enhanced care (EC), and prospective EC plus Xpert (EC+X) phase. EC and EC+X phases were implemented as a stepped-wedge trial. Participants in the EC phase received SOC plus components 1 (strengthened ICF) and 2 (active tracing) of the intervention package, and participants in the EC+X phase received SOC plus all three intervention package components. Primary and secondary objectives were to compare all-cause 6-mo ART mortality between SOC and EC+X and between EC and EC+X phases, resp. We used adjusted analyses, appropriate for study design, to control for baseline differences in individual-level factors and intra-facility correlation. We enrolled 14,963 eligible patients: 8980 in SOC, 1768 in EC, and 4215 in EC+X phases. Median age of ART enrollees was 35 and 64% were female. Median CD4 cell count was lower in SOC than subsequent phases (184/μL in SOC, 246/μL in EC, and 241/μL in EC+X). By 6 mo of ART, 461 (5.3%) of SOC, 54 (3.2%) of EC, and 121 (3.0%) of EC+X enrollees had died. Compared with SOC, 6-mo mortality was lower in the EC+X phase (adjusted hazard ratio, 0.77; 95% confidence interval, 0.61-0.97, p = 0.029). Compared with EC enrollees, 6-mo mortality was similar among EC+X enrollees. Interventions to strengthen ICF and retention were associated with lower early ART mortality. This new evidence highlights the need to strengthen ICF and retention in many similar settings. Similar to other trials, no addnl. mortality benefit of replacing sputum-smear microscopy with Xpert was observed

BMC Medicine published new progress about Antiviral agents. 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

Ling, Kenneth B.; Smith, Andrew D. published the artcile< α-Aroyloxyaldehydes: scope and limitations as alternatives to α-haloaldehydes for NHC-catalyzed redox transformations>, SDS of cas: 112-63-0, the main research area is alpha aryloxyaldehyde NHC catalyst redox esterification cycloaddition.

α-Aroyloxyaldehydes are readily prepared bench stable synthetic intermediates. Their ability to act as α-haloaldehyde surrogates for NHC-promoted redox esterifications and in [4+2] cycloadditions is described.

Chemical Communications (Cambridge, United Kingdom) published new progress about [4+2] Cycloaddition reaction. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

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

Rana, Qurrat Ul Ain; Irfan, Muhammad; Ahmed, Safia; Hasan, Fariha; Shah, Aamer Ali; Khan, Samiullah; Ur Rehman, Fazal; Khan, Haji; Ju, Meiting; Li, Weizun; Badshah, Malik published the artcile< Bio-catalytic transesterification of mustard oil for biodiesel production>, Electric Literature of 112-63-0, the main research area is biodiesel mustard oil fatty acid mathyl ester biocatalysis transesterification.

The depletion of non-renewable fossil fuels and a surge in their prices have led researchers to seek alternative, renewable energy sources; among them, biodiesel is a good option, especially in the ever-growing global transport sector. Mustard oil is a potential feedstock for biodiesel production, and because it is non-edible it avoids the food vs. fuel feud. Biocatalytic transesterification of mustard oil for biodiesel production makes this process cost efficient, environmentally friendly and sustainable. In the current study, Pseudomanas aeruginosa Q8 KX12304-mediated transesterification of mustard oil was carried out. The parameters for the transesterification reaction were statistically optimized using Plackett-Burman and central composite design. The highest biodiesel volumetric yield obtained was 100% at optimized conditions. The quality of biodiesel was confirmed using gas chromatog.-mass spectrometry (GCMS) and the produced biodiesel was found to meet the quality standards specified by American Society for Testing and Materials (ASTM) and EU-14103. The fatty acid Me ester contents of the biodiesel produced were erucic acid Me esters (48.2%), palmitic acid Me esters (11.8%), oleic acid Me esters (10.6%), linolenic acid Me esters (10.3%), linoleic acid Me esters (9.1%) and stearic acid Me esters (8%). To the best of our knowledge, this is the first study to report transesterification of mustard oil via biocatalysis.

Biofuels published new progress about Biocatalysis. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.

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

Asikainen, Sanja; Seppala, Jukka published the artcile< Photo-crosslinked anhydride-modified polyester and -ethers for pH-sensitive drug release>, Quality Control of 112-63-0, the main research area is photocrosslinked anhydride modified polyester polyether drug delivery system; Drug delivery; Lidocaine; Photo-crosslinking; Poly(ester anhydride); Poly(ether anhydride); Vitamin B(12).

Photo-crosslinkable polymers have a great potential for the delivery of sensitive drugs. They allow preparation of drug releasing devices by photo-crosslinking, thus avoiding high processing temperatures In this study, the hydrolysis behavior and drug release of three different photo-crosslinkable poly(ether anhydride)s and one poly(ester anhydride) were investigated. Three-arm poly(ethylene glycol) or polycaprolactone was reacted with succinic anhydride to obtain carboxylated macromers, and further functionalized with methacrylic anhydride to form methacrylated marcromers with anhydride linkages. The synthesized macromers were used to prepare photo-crosslinked matrixes with different hydrolytic degradation times for active agent release purposes. The hydrolysis was clearly pH-sensitive: polymer networks degraded slowly in acidic conditions, and degradation rate increased as the pH shifted towards basic conditions. Drug release was studied with two water-soluble model drugs lidocaine (234 mol/g) and vitamin B12 (1355 g/mol). Vitamin B12 was released mainly due to polymer network degradation, whereas smaller mol. lidocaine was released also through diffusion and swelling of polymer network. Only a small amount of vitamin B12 was released in acidic conditions (pH 1.3 and pH 2.1). These polymers have potential in colon targeted drug delivery as the polymer could protect sensitive drugs from acidic conditions in the stomach, and the drug would be released as the conditions change closer to neutral pH in the intestine.

European Journal of Pharmaceutics and Biopharmaceutics published new progress about Acrylic polymers, polyester- Role: PRP (Properties), SPN (Synthetic Preparation), THU (Therapeutic Use), PREP (Preparation), BIOL (Biological Study), USES (Uses). 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

Lu, Xiaotong; Li, Shengnan; Wang, Limin; Huang, Sujuan; Liu, Zhongqiu; Liu, Yujing; Ying, Anguo published the artcile< Novel photic and magnetic double responsive Pickering interfacial solid catalysts for biodiesel production>, Formula: C19H34O2, the main research area is diazabicyclooctane spiropyran iron oxide silica transesterification catalyst nanocomposite.

The prime purpose of this work is to prepare a novel kind of Pickering interfacial solid catalysts for biodiesel production to meet the requirements of highly efficiency and environmental benign. To achieve this goal, the core-shell P[xSPA-yDABCO]@SiO2@Fe3O4 composite materials with a shell of photo-responsive and base catalytic sites were manufactured by means of layer-by-layer fabrication method. The modified materials, entirely characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), Fourier transform IR (FT-IR) spectra, X-ray powder diffraction (XRD) and magnetization vs. magnetic (VSM) techniques, demonstrated sufficient catalytic active sites and photo-responsive sites. Among all the so-prepared catalysts, P[3SPA-2DABCO]@Fe3O4 performs extremely well and can stabilize soybean oil-in-methanol Pickering emulsion for 24 h, achieving a biodiesel yield up to 98.2% at a catalyst dosage of 5 wt% after the reaction time of 5 h at 60 °C. Furthermore, the double responsive solid catalyst can be readily separated from the mixture of reaction by an external magnet and UV irradiation, and still presented superior catalytic activity after 6 cycles.

Fuel published new progress about Adsorption. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

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

Dajek, Maciej; Pruszczynska, Agnieszka; Konieczny, Krzysztof A.; Kowalczyk, Rafal published the artcile< Cinchona Squaramide-Catalyzed Intermolecular Desymmetrization of 1,3-Diketones Leading to Chiral 1,4-Dihydropyridines>, Category: esters-buliding-blocks, the main research area is cyclic diketone unsaturated ketoester ammonium acetate squaramide catalyst Michael; hexahydroquinoline carboxylate diastereoselective preparation.

Addition of prochiral cyclic 1,3-diketones to Michael acceptors applying bifunctional Cinchona-derived squaramides resulted in chiral adducts with stereoselectivities of up to 99% ee and allowed for desymmetrization of the nucleophile. These labile hemiacetal intermediates were transformed to new 1,4-dihydropyridines with high diastereoselectivities and no erosion of optical purity. Their further oxidation to pyridine followed by Fisher indolization provided chiral pyridine-indoles.

Advanced Synthesis & Catalysis published new progress about Benzopyrans Role: PRP (Properties), RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

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

Wang, Yichang; Bao, Gang; Zhang, Miao; Xiang, Jianyang; Zhou, Haoyu; Wahafu, Alafate; Wu, Wei; Ma, Xudong; Huo, Longwei; Bai, Xiaobin; Xie, Wanfu; Liu, Peijun; Wang, Maode published the artcile< CRB2 enhances malignancy of glioblastoma via activation of the NF-κB pathway>, Reference of 112-63-0, the main research area is CRB2 NFkappaB signaling activation glioblastoma malignancy.

Glioblastoma (GBM) is one of the most lethal types of primary brain tumors in adults with a median survival of less than 15 mo. Although comprehensive clin. treatment strategies including surgical resection followed by radiotherapy and chemotherapy are widely applied, the prognosis for GBM patients remains dismal. The Nuclear Factor-κB (NF-κB) signaling pathway is a complex network linking extracellular stimuli to cell survival and proliferation, and aberrant activation of NF-κB signaling has been implicated in the propagation of a wide range of cancers. However, the underlying mechanism of NF-κB activation still requires further investigation. Here, we report that crumbs homolog 2 (CRB2) is markedly up-regulated in human GBM relative to non-tumor tissues or normal astrocytes. Clin., enriched CRB2 could be observed in high grade glioma with IDH IDH wild-type and 1p19q co-deletion and implied poor outcome in GBM. Consistent with this, malignant characteristics of GBM cells including proliferation, migration, invasion and tumorigenesis were significantly suppressed by lentivirus knock-down of CRB2. Furthermore, exogenous overexpression of CRB2 enhanced the malignant biol. signatures of GBM cells as well as therapy resistance to temozolomide (TMZ). To further investigate the mol. mechanisms responsible, bioinformatics anal. was performed using 3 public databases, with the result that CRB2 was found to correlate closely with tumor necrosis factor α (TNFα)-NF-κB signaling. Mechanistically, elevated CRB2 increased the phosphorylation of IκB-kinase α (IKKα), thus activating NF-κB via reduction of Ikβ protein. Taken together, these data suggest that CRB2 might be a reliable prognostic biomarker and potential therapeutic target for GBM.

Experimental Cell Research published new progress about Astrocyte. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Reference of 112-63-0.

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