Tag: M.W=250-300

Jiang, Lijun; Lung, Hong Lok; Huang, Tao; Lan, Rongfeng; Zha, Shuai; Chan, Lai Sheung; Thor, Waygen; Tsoi, Tik-Hung; Chau, Ho-Fai; Borestrom, Cecilia; Cobb, Steven L.; Tsao, Sai Wah; Bian, Zhao-Xiang; Law, Ga-Lai; Wong, Wing-Tak; Tai, William Chi-Shing; Chau, Wai Yin; Du, Yujun; Tang, Lucas Hao Xi; Chiang, Alan Kwok Shing; Middeldorp, Jaap M.; Lo, Kwok-Wai; Mak, Nai Ki; Long, Nicholas J.; Wong, Ka-Leung published the artcile< Reactivation of epstein-barr virus by a dual-responsive fluorescent EBNA1-targeting agent with Zn2+-chelating function>, COA of Formula: C19H34O2, the main research area is epstein barr virus oncolysis cancer EBNA1 zinc probe ZRL5P4; EBNA1-targeting agent; EBV-specific lytic inducer; dual-responsive fluorescent EBV probe.

Epstein-Barr nuclear antigen 1 (EBNA1) plays a vital role in the maintenance of the viral genome and is the only viral protein expressed in nearly all forms of Epstein-Barr virus (EBV) latency and EBV-associated diseases, including numerous cancer types. To our knowledge, no specific agent against EBV genes or proteins has been established to target EBV lytic reactivation. Here we report an EBNA1- and Zn2+-responsive probe (ZRL5P4) which alone could reactivate the EBV lytic cycle through specific disruption of EBNA1. We have utilized the Zn2+ chelator to further interfere with the higher order of EBNA1 self-association The bioprobe ZRL5P4 can respond independently to its interactions with Zn2+ and EBNA1 with different fluorescence changes. It can selectively enter the nuclei of EBV-pos. cells and disrupt the oligomerization and oriP-enhanced transactivation of EBNA1. ZRL5P4 can also specifically enhance Dicer1 and PML expression, mol. events which had been reported to occur after the depletion of EBNA1 expression. Importantly, we found that treatment with ZRL5P4 alone could reactivate EBV lytic induction by expressing the early and late EBV lytic genes/proteins. Lytic induction is likely mediated by disruption of EBNA1 oligomerization and the subsequent change of Dicer1 expression. Our probe ZRL5P4 is an EBV protein-specific agent that potently reactivates EBV from latency, leading to the shrinkage of EBV-pos. tumors, and our study also suggests the association of EBNA1 oligomerization with the maintenance of EBV latency.

Proceedings of the National Academy of Sciences of the United States of America published new progress about Antitumor agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.

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

Feng, Yaqing; Zhang, Xiaodong published the artcile< Study on synthesis of spiro[5.5]undecan-3-one>, Product Details of C19H34O2, the main research area is spiroundecanone preparation.

The title compound was prepared in 4 steps in 28.9% overall yield from cyclohexanone.

Tianjin Daxue Xuebao published new progress about 112-63-0. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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

Bonjour, Olivier; Liblikas, Ilme; Pehk, Tonis; Khai-Nghi, Truong; Rissanen, Kari; Vares, Lauri; Jannasch, Patric published the artcile< Rigid biobased polycarbonates with good processability based on a spirocyclic diol derived from citric acid>, COA of Formula: C19H34O2, the main research area is spirocyclic diol biobased polycarbonate synthesis property processability.

Introducing biobased polymers from renewable sources for use as high-performance thermoplastics with high demands on mech. rigidity, transparency, thermal stability, as well as good processability, is a significant challenge. In the present work we have designed and prepared a rigid biobased bis-spirocylic diol by di-cycloketalization of a bicyclic diketone (cis-bicyclo[3.3.0]octane-3,7-dione, obtained from citric acid) using trimethylolpropane. This spiro-diol monomer has two reactive primary hydroxyl groups and the synthesis from inexpensive biobased starting materials is straightforward and readily upscalable, involving no chromatog. purification In order to explore the usefulness of the new monomer, it was employed in melt polycondensations with diphenylcarbonate at up to 280°C to form rigid fully amorphous polycarbonates (PCs). Mol. weights (MWs) up to Mn = 28 kg mol-1 were achieved, and thermal and dynamic mech. measurements showed glass transitions up to Tg = 100°C, with no thermal decomposition until Td ∼350°C. Solvent cast films had excellent mech. flexibility and strength, as well as a high transparency with only slight coloration. Results by dynamic melt rheol. implied that the high-MW PCs had a good processability at 170°C, with a stable shear modulus over time, but started to degrade via chain scission reactions when the temperature approached 200°C. In conclusion, the present work demonstrates the straightforward preparation of the citric acid-based spiro-diol, and indicates that it is an efficient building block for the preparation of rigid biobased PCs and other condensation polymers.

Green Chemistry published new progress about Condensation polymerization. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.

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

Seo, Chang-Seob; Lee, Mee-Young published the artcile< Method Development and Validation for Simultaneous Analysis of Eleven Components for Quality Control of Geumgwesingihwan Using HPLC-DAD and UPLC-MS/MS>, Electric Literature of 112-63-0, the main research area is geumgwesingihwan hplc uplc ms.

Geumgwesingihwan (GGSGH) is an oriental herbal formula made by adding Achyranthes bidentate Blume and Plantago asiatica L. to Yukmijiwhanghwan. It has been used for the treatment of edema since ancient times. The purpose of this study is to develop and validate a method for simultaneous quantification of 11 components: gallic acid (1), 5-(hydroxymethyl)furfural (2), geniposidic acid (3), morroniside (4), loganin (5), paeoniflorin (6), acteoside (7), cornuside (8), benzoic acid (9), benzoylpaeoniflorin (10), and paeonol (11), using high-performance liquid chromatog. with a diode array detector (HPLC-DAD) and ultra-performance liquid chromatog.-tandem mass spectrometry (UPLC-MS/MS). Compounds 1-11 were separated on a Capcell Pak UG 80 C18 column (250 mm x 4.6 mm, 5 μm) using a mobile phase of a distilled water-acetonitrile system, both containing 0.1% formic acid. In UPLC-MS/MS, compounds 1-11 were separated on an Acquity UPLC BEH C18 column (100 mm x 2.1 mm, 1.7 μm) using a mobile phase of a distilled water-acetonitrile system containing 1.0% acetic acid. Using these methods, samples of GGSGH were determined to contain 0.13-2.87 mg/g (HPLC-DAD) and not detected-4.60 mg/g (UPLC-MS/MS) of compounds 1-11. The developed HPLC-DAD assays for simultaneous determination of all analytes were validated with respect to linearity, limits of detection and quantification, recovery, and precision. The established HPLC assay will be used to obtain basic data for quality evaluation of GGSGH and related oriental herbal formulas.

Separations published new progress about HPLC. 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

Li, Sha; Yang, Wenhan; Luo, Xian; Yao, Changsheng published the artcile< An efficient N-heterocyclic carbene (NHC)-catalyzed synthesis of polysubstituted cyclopentene>, Product Details of C19H34O2, the main research area is nitrogen heterocyclic carbene catalysis polysubstituted cyclopentene synthesis.

An one-pot, cascade assembly of polysubstituted cyclopentene was realized via the N-heterocyclic carbene (NHC)-catalyzed annulation of the in situ activated α,β-unsaturated carboxylic acid with 2-(2-oxo-2-arylethyl)malononitrile through the sequence of Michael addition, aldol condensation and decarboxylation. This method could serve as a new attractive strategy for the practical syntheses of multi-functionalized cyclopentene derivatives with broad substrate scope, readily availability of starting materials, mild reaction conditions, excellent yields and operational simplicity.

Youji Huaxue published new progress about Aldol condensation. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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

Steiner, Margaret C.; Gibson, Keylie M.; Crandall, Keith A. published the artcile< Drug resistance prediction using deep learning techniques on HIV-1 sequence data>, Product Details of C19H34O2, the main research area is antiHIV drug resistance deep learning HIV infection; HIV; HIV drug resistance; antiretroviral therapy; deep learning; machine learning; neural networks.

The fast replication rate and lack of repair mechanisms of human immunodeficiency virus (HIV) contribute to its high mutation frequency, with some mutations resulting in the evolution of resistance to antiretroviral therapies (ART). As such, studying HIV drug resistance allows for real-time evaluation of evolutionary mechanisms. Characterizing the biol. process of drug resistance is also critically important for sustained effectiveness of ART. Investigating the link between “”black box”” deep learning methods applied to this problem and evolutionary principles governing drug resistance has been overlooked to date. Here, we utilized publicly available HIV-1 sequence data and drug resistance assay results for 18 ART drugs to evaluate the performance of three architectures (multilayer perceptron, bidirectional recurrent neural network, and convolutional neural network) for drug resistance prediction, jointly with biol. anal. We identified convolutional neural networks as the best performing architecture and displayed a correspondence between the importance of biol. relevant features in the classifier and overall performance. Our results suggest that the high classification performance of deep learning models is indeed dependent on drug resistance mutations (DRMs). These models heavily weighted several features that are not known DRM locations, indicating the utility of model interpretability to address causal relationships in viral genotype-phenotype data.

Viruses published new progress about Anti-HIV agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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

Li, Zhimao; Li, Yingchun; He, Maoyong; Wang, Wensheng; Li, Jie published the artcile< Effects of the species of crosslinking reagents on the structures and properties of biodegradable poly (butanediol sebacate-butanediol terephthalate) copolyester>, Synthetic Route of 112-63-0, the main research area is polybutylene sebacate terephthalate crosslinking agent esterification polycondensation; mech thermal property.

In the present study, poly(butylene sebacate-co-terephthalate)s having different crosslinking reagents were synthesized with a random distribution by a two-step esterification and one-step polycondensation process. In detail, the using crosslinking agents were included trimethylolethane (TME), trimethylolpropane, tris(hydroxymethyl)aminoethane, glycerol (GL). Particularly, CS refers to a sample with no crosslinking agent added. The copolyester with TME was the least crystalline sample, and the melting peaks of all copolyesters corresponding to both, sebacate and terephthalate-rich phases were still observable in second calorimetric heating runs. These copolyesters were associated with interesting thermal and mech. properties. The m.ps. of all samples were higher than 118°C and the puncture resistance and tensile strength of GL, the tear strength of TME, and the Young’s modulus of all samples have been improved. Enzymic degradability was assessed and the effect of composition and crystallinity on the degradation rate was investigated. The copolyester adding GL appears as a highly promising biodegradable material since it showed a significant weight loss during exposure to all selected degradation media. In brief, the improvement of PBSeT’s puncture resistance, tear strength, and degradation performance is extremely important for the development and promotion of degradable foam, film, and elastomer materials.

Journal of Applied Polymer Science published new progress about Breaking strength. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Synthetic Route of 112-63-0.

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

Chen, Zhi-Min; Yang, Bin-Miao; Chen, Zhi-Hua; Zhang, Qing-Wei; Wang, Min; Tu, Yong-Qiang published the artcile< Organocatalytic Asymmetric Fluorination/Semipinacol Rearrangement: An Efficient Approach to Chiral β-Fluoroketones>, Reference of 112-63-0, the main research area is chiral fluoro ketone preparation; oxa allylic alc preparation asym fluorination semipinacol rearrangement; cinchona alkaloid catalyst asym fluorination semipinacol rearrangement.

Fluorination/semipinacol rearrangement of 2-oxa allylic alcs. was catalyzed by cinchona-alkaloid derivatives in an asym. manner. E.g., in presence of ((DHQD)2PYR), K2CO3, and NFSI in ClCH2CH2Cl, fluorination/semipinacol rearrangement of alc. (I) gave 56% β-fluoro ketone (S,S)-II (93% ee). Use of the catalyst ((DHQ)2PYR) in this reaction gave ent-II.

Chemistry – A European Journal published new progress about Allylic alcohols Role: 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, Reference of 112-63-0.

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

Katoh, H.; Ishida, T.; Kuwata, Shinichi; Kiniwa, H. published the artcile< Optical resolution of 2-hydroxy acids by high-performance ligand exchange chromatography>, Computed Properties of 112-63-0, the main research area is ligand exchange HPLC hydroxy acid; hydroxy carboxylic acid resolution HPLC; iron reagent amino hydroxy acid distinction; liquid chromatog resolution amino hydroxy acid; beverage analysis amino hydroxy acid; octylalanine chiral phase HPLC resolution.

Using an MCI GEL CRS10W column, which was packed with octadecyl silica coated with N,N-dioctyl-L-alanine, optical resolution of 2-hydroxy acids was performed by ligand-exchange HPLC. The optical resolution of mandelic acid derivatives and C2 to C5 2-hydroxy acids was carried without any pretreatment. The MCI GEL CRS10W column could resolve amino acids and 2-hydroxy acids. For their selective detection, a post-column method was employed in which the specific color reaction of 2-hydroxy acids with iron(III) ion was utilized. For the anal. of beverages, in which amino acids and 2-hydroxy acids often coexist, the present method was effective in distinguishing between these enantiomers.

Chromatographia published new progress about Amino acids Role: BIOL (Biological Study). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Computed Properties of 112-63-0.

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

Shugaev, A. G.; Butsanets, P. A.; Shugaeva, N. A. published the artcile< Effect of High Temperature on Oxidation of NAD-Dependent Substrates and Alternative Oxidase Activity in Mitochondria of Lupine Cotyledons>, Category: esters-buliding-blocks, the main research area is NAD oxidation temperature alternative oxidase mitochondria Lupine.

Isolated mitochondria from lupine (Lupinus angustifolius L.) cotyledons were used to study the effect of temperature in the range of 20-40°C on oxidation of malate and other NAD-dependent respiratory substrates as well as on the activity of alternative CN-resistant oxidase. The metabolic responses of mitochondria to heat treatment analyzed in vitro were compared with metabolic activities of organelles isolated from seedlings exposed to elevated temperature in vivo. Mild warming of the incubation medium (20-30°C) accelerated oxygen uptake by mitochondria during malate oxidation in the presence of glutamate in the active phosphorylating state (state 3) and, to a lesser extent, in the state 4 (in the absence of ADP). The enhancement of mitochondrial respiration at increasing temperature in this range was entirely due to the activation of the cytochrome pathway in electron-transport chain (ETC). At temperatures of 35-40°C, an appreciable inhibition of the alternative respiration pathway was observed The successive additions of ADP during malate oxidation under hyperthermia (35-40°C) caused the improvement (phenomenon of conditioning) of oxidative phosphorylation parameters. After the second addition of 100-200μM ADP, the rate of substrate oxidation in state 3 and the respiratory control ratio (RCR) increased significantly. Similar changes in mitochondrial respiration under hyperthermia were found upon oxidation of other NAD-dependent substrates, but they did not occur during succinate oxidation catalyzed by ETC complex II. In mitochondria isolated from cotyledons of lupine seedlings that were exposed in vivo to high temperature (35°C for 12 h), the malate oxidation at 25 or 35°C was also characterized by a sharp decrease in RCR and the state 3 rate after the first addition of ADP, but these parameters were restored during several cycles of phosphorylation. Oxidation of malate and other NAD-dependent substrates catalyzed by complex I after heating of mitochondria at 40°C in the presence of 10 mM MgCl2 was substantially inhibited and was carried out by rotenone-insensitive NADH dehydrogenases. The results suggest that the suppressed oxidation of NAD-dependent substrates in lupine cotyledon mitochondria at high temperature is probably due to the reversible transformation of complex I from the active to the deactivated form (A/D transition). Possible physiol. significance of such regulatory changes in plant respiration in response to adverse environmental conditions is discussed.

Russian Journal of Plant Physiology published new progress about Cotyledon. 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