Tag: M.W=100-200

In an article, author is Yamaguchi, Kazuki, once mentioned the application of 2491-20-5, Recommanded Product: 2491-20-5, Name is H-Ala-OMe.HCl, molecular formula is C4H10ClNO2, molecular weight is 139.58, MDL number is MFCD00063663, category is amides-buliding-blocks. Now introduce a scientific discovery about this category.

Effects of Amide-Based modifiers on surface activation and devulcanization of rubber

This paper examines the mechanisms of interaction between two modifiers in asphalt binder: an amide-based bio-modifier, and natural rubber vulcanized by sulfur crosslinks. The amide-rich bio-modifier surface-activates the rubber, cleaving the disulfide bonds and leading to partial surface devulcanization. Computational modeling and laboratory experiments were used to evaluate the devulcanization mechanism and its effects. Results show that non-covalent interaction between the -NH2 site of the bio-modifier and the S-S crosslink of the rubber is stronger than with the C-S part of the rubber, which can potentially induce partial devulcanization. This phenomenon is reflected in the empirical results: a reduction in viscosity, due to devulcanization; and an increased resistance to fatigue, due to improved interaction between rubber and bitumen. This study provides an in-depth understanding of the surface devulcanization mechanism of rubber, in addition to insights into the complex devulcanization process happening inside a bio-modified mixture of rubber and asphalt binder. The results of this study help expand the knowledge of bio-modifiers and present a new approach for devulcanization.

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Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, SDS of cas: 1185-53-11185-53-1, Name is Tris hydrochloride, SMILES is OCC(CO)(N)CO.[H]Cl, belongs to amides-buliding-blocks compound. In a article, author is Wang, Weizheng, introduce new discover of the category.

Optical Kerr effect spectroscopy of CS2 in monocationic and dicationic ionic liquids: insights into the intermolecular interactions in ionic liquids

A comparative study of the intermolecular dynamics of CS2 in monocationic and dicationic ionic liquids (ILs) was performed using optical heterodyne-detected Raman-induced Kerr effect spectroscopy (OHD-RIKES). The reduced spectral densities (RSDs) of mixtures of CS2 in 1-alkyl-3-methylimidazolium bis[(trifluoromethane)sulfonyl]amide ([C(n)C(1)im][NTf2] for n = 3-5) and 1,2n-bis(3-methylimidazolium-1-yl) alkane bis[(trifluoromethane)sulfonyl]amide ([(C(1)im)(2)C-2n][NTf2](2) for n = 3-5) were investigated as a function of concentration at 295 K. An additivity model was used to obtain the CS2 contribution to the RSD of a mixture in the 0-200 cm(-1) region. One of the aims of this study is to show how CS2 can be used as a probe of intermolecular/interionic interactions in ILs. The concentrations were chosen such that the CS2-to-imidazolium ring mole fraction of a mixture with [(C(1)im)(2)C-2n][NTf2](2) (DIL(2n)) is the same as that of a mixture with [C(n)C(1)im][NTf2] (MIL(n)). As found previously for CS2 in monocationic ILs, the intermolecular spectrum of CS2 in dicationic ILs is lower in frequency and narrower than that of neat CS2. The new result is that the intermolecular spectrum of CS2 is higher in frequency in DIL(2n) than in the corresponding MIL(n), indicating that CS2 molecules experience a stiffer potential in dicationic ILs than in monocationic ILs. The intermolecular dynamics of CS2 being higher in frequency in DIL(2n) than in MIL(n) is consistent with recent molecular dynamics simulations (Lynden-Bell and Quitevis, J. Chem. Phys., 2018, 148, 193844) that show the stiffer potential is the result of greater confinement of CS2 in DIL(2n) than in MIL(n). We also show in this study how effects due to dilution and the intermolecular potential seen by a solute molecule in solution are unraveled.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions. you can also check out more blogs about 1185-53-1. SDS of cas: 1185-53-1.

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. Computed Properties of C8H10ClNO, 5468-37-1, Name is 2-Aminoacetophenone hydrochloride, SMILES is NCC(C1=CC=CC=C1)=O.[H]Cl, in an article , author is Wang, Jianchun, once mentioned of 5468-37-1.

Bifunctional cyclomatrix polyphosphazene-based hybrid with abundant decorating groups: Synthesis and application as efficient electrochemical Pb(II) probe and methylene blue absorbent

Hypothesis: The construction of novel functional cyclomatrix polyphosphazenes (CPPs) hybrid, which with diverse decorating groups, is a challenging task due to the structural limitation of available reaction substrates (phenols and amines). Experiments: Herein, a phenolic hydroxyl (-OH) modified ployamide derivative (P2) was successfully prepared via novel benzoxazine-isocyanide chemistry (BIC). A kind of CPP hybrid (P3), which with abundant functional groups (amide, tertiary amine, benzoxazine and phenolic hydroxyl) was prepared subsequently by the condensation between P2 and hexachlorocyclotriphosphazene (HCCP). Chemical structure, elemental composition, morphology, porous properties and crystallinity of P3 were systematically analyzed here. The electrochemical detection of lead ion (Pb2+) was realized by using P3-modified glassy carbon electrode (GCE/Nafion/P3) as the working electrode. Besides this, given the unique chemical structure and morphology of P3, the selective adsorption of methylene blue (MB) by P3 was also studied here. Findings: Experimental results indicated that that P3 can act as bifunctional hybrid material to solve environmental issues. (c) 2020 Elsevier Inc. All rights reserved.

But sometimes, even after several years of basic chemistry education, it is not easy to form a clear picture on how they govern reactivity! 5468-37-1, you can contact me at any time and look forward to more communication. Computed Properties of C8H10ClNO.

Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 62-57-7, Name is H-Aib-OH, SMILES is CC(C(O)=O)(C)N, belongs to amides-buliding-blocks compound. In a document, author is Li, Yang, introduce the new discover, Quality Control of H-Aib-OH.

Ab initio study of spectroscopic properties at anharmonic force fields of LiNH2

This work presents a systematic investigation of the spectroscopic properties at anharmonic force fields of ground electronic state (X similar to 1A1) of LiNH2, which are calculated using second-order Moller-Plesset perturbation theory (MP2) and density functional theory (DFT) with hybrid GGA and meta-hybrid GGA (M06-2X) exchange-correlation functional. Two high angular momentum basis sets of 6-311+g (2d, p) and 6-311++g (3df, 2pd) are used. The equilibrium geometries, ground-state rotational constants, harmonic frequencies, and quartic and sextic centrifugal distortion constants of LiNH2 are calculated and compared with corresponding experimental or theoretical data. The predicted accuracy of the calculated constants has been confirmed by analyzing the deviations with respect to experiment. In addition, the anharmonic constants, vibration-rotation interaction constants, force constants, and Coriolis coupling constants of LiNH2 are firstly obtained. The infrared spectrum is predicted and together with the first prediction on the higher-order anharmonic constants contributes to a better understanding of the vibrational and rotational characteristics of LiNH2, thus revealing its internal structure.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 62-57-7 is helpful to your research. Quality Control of H-Aib-OH.

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 5977-14-0, Name is Acetoacetamide, molecular formula is C4H7NO2. In an article, author is Kawahara, Nobuhiro,once mentioned of 5977-14-0, SDS of cas: 5977-14-0.

Chemical constituents from Piper boehmeriifolium (Miq.) Wall. ex C. DC

The chemical investigation of whole plants Piper boehmeriifolium (Miq.) Wall. ex C. DC. led to the isolation of 22 compounds, including two lignans (1-2), sixteen amide alkaloids (3-18), one diterpene (19), two monoterpenes (20-21), and one phenylpropanoid (22). Their structures were elucidated by extensive spectroscopic analyses including NMR, MS, and by comparison with the literature. Compounds 1-2, 6-7, 11-12,14, and 17-22 were firstly isolated from P. boehmeriifolium, while compounds 2, and 19-20 were isolated from Piper genus for the first time. The chemotaxonomic significance of these isolated compounds is discussed. (C) 2017 Elsevier Ltd. All rights reserved.

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Reference of 34381-71-0, The transformation of simple hydrocarbons into more complex and valuable products via catalytic C¨CH bond functionalisation has revolutionised modern synthetic chemistry. 34381-71-0, Name is (S)-(-)-1-Methyl-2-pyrrolidinemethanol, SMILES is OC[C@H]1N(C)CCC1, belongs to amides-buliding-blocks compound. In a article, author is Poochai, Chatwarin, introduce new discover of the category.

Simple Alkaline-Earth Metal Catalysts for Effective Alkene Hydrogenation

Alkaline earth metal amides (AeN ”(2): Ae = Ca, Sr, Ba, N ” = N(SiMe3)(2)) catalyze alkene hydrogenation (80-120 degrees C, 1-6 bar H-2, 1-10 mol% cat.), with the activity increasing with metal size. Various activated C=C bonds (styrene, p-MeO-styrene, alpha-Me-styrene, Ph2C=CH2, trans-stilbene, cyclohexadiene, 1-Ph-cyclohexene), semi-activated C=C bonds (Me3SiCH=CH2, norbornadiene), or non-activated (isolated) C= C bonds (norbornene, 4-vinylcyclohexene, 1-hexene) could be reduced. The results show that neutral Ca or Ba catalysts are active in the challenging hydrogenation of isolated double bonds. For activated alkenes (e.g. styrene), polymerization is fully suppressed due to fast protonation of the highly reactive benzyl intermediate by N ” H (formed in the catalyst initiation). Using cyclohexadiene as the H source, the first Ae metal catalyzed H-transfer hydrogenation is reported. DFT calculations on styrene hydrogenation using CaN ”(2) show that styrene oligomerization competes with styrene hydrogenation. Calculations also show that protonation of the benzylcalcium intermediate with N ” H is a low-energy escape route, thus avoiding oligomerization.

Reference of 34381-71-0, One of the oldest and most widely used commercial enzyme inhibitors is aspirin, which selectively inhibits one of the enzymes involved in the synthesis of molecules that trigger inflammation. you can also check out more blogs about 34381-71-0.

Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. , Formula: C6H13NO2, 16066-84-5, Name is tert-Butyl methylcarbamate, molecular formula is C6H13NO2, belongs to amides-buliding-blocks compound. In a document, author is Sattar, Moh, introduce the new discover.

Preparation and characterization of pickering emulsion stabilized by hordein-chitosan complex particles

In this study, hordein-chitosan complex particles (HCPs) were prepared using anti-solvent precipitation method. The addition of chitosan led to the increase in the particle diameter and zeta-potential as well as the gradual decrease in fluorescence intensity values of HCPs, indicating chitosan absorbed onto the surface of hordein particles. Fourier transform infrared spectra of HCPs showed the significant shifts of peak position for O-H stretching vibration, amide I and II bands after addition of chitosan, suggesting the formation of hydrogen bonds and hydrophobic interactions between hordein and chitosan. Three-phase contact angle (theta(o/w)) of HCPs revealed the excellent wettability (theta(o/w) = 89.3 +/- 1 degrees) of particles when the mass ratio of hordein to chitosan was 2:1 (HCPs(2:1)). Oil-in-water Pickering emulsions (Caprylic/Capric Triacylglyceride as oil phase) stabilized by HCPs(2:1) were further prepared. Confocal laser scanning microscope images indicated that HCPs absorbed at the oil/water interface and formed a dense steric barrier on the surface of spherical oil droplets. Higher oil fractions (50% and 60%) led to the formation of stable Pickering emulsion gels, which showed long-term storage stability. This study provides a new solution to accelerate the application of hordein-based Pickering emulsions in food industry.

A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 16066-84-5. Formula: C6H13NO2.

Chemistry is an experimental science, Recommanded Product: (R)-2-Aminopentanedioic acid, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 6893-26-1, Name is (R)-2-Aminopentanedioic acid, molecular formula is C5H9NO4, belongs to amides-buliding-blocks compound. In a document, author is Gao, Han.

An NMR Method To Pinpoint Supramolecular Ligand Binding to Basic Residues on Proteins

Targeting protein surfaces involved in protein-protein interactions by using supramolecular chemistry is a rapidly growing field. NMR spectroscopy is the method of choice to map ligand-binding sites with single-residue resolution by amide chemical shift perturbation and line broadening. However, large aromatic ligands affect NMR signals over a greater distance, and the binding site cannot be determined unambiguously by relying on backbone signals only. We herein employed Lys- and Arg-specific H-2(C) N NMR experiments to directly observe the side-chain atoms in close contact with the ligand, for which the largest changes in the NMR signals are expected. The binding of Lys- and Arg-specific supramolecular tweezers and a calixarene to two model proteins was studied. The H-2(C) N spectra track the terminal CH2 groups of all Lys and Arg residues, revealing significant differences in their binding kinetics and chemical shift perturbation, and can be used to clearly pinpoint the order of ligand binding.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law. In my other articles, you can also check out more blogs about 6893-26-1. Recommanded Product: (R)-2-Aminopentanedioic acid.

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 57-00-1, Name is 2-(1-Methylguanidino)acetic acid, molecular formula is C4H9N3O2. In an article, author is Zhang, Min,once mentioned of 57-00-1, Quality Control of 2-(1-Methylguanidino)acetic acid.

Cleavage of the main carbon chain backbone of high molecular weight polyacrylamide by aerobic and anaerobic biological treatment

High molecular weight partially hydrolyzed polyacrylamide (PAM) can be bio-hydrolyzed on the amide side group, however, solid evidence regarding the biological cleavage of its main carbon chain backbone is limited. In this study, viscometry, flow field-flow fractionation multi-angle light scattering (FFF-MALS), and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) analysis were used to investigate the biodegradability of PAM with a nominal molecular weight of 2 x 10(7) Da (Da) in two suspended aerobic (25 and 40 degrees C) and two upflow anaerobic blanket reactors (35 and 55 degrees C) operated for 470 d under a hydraulic residence time (HRT) of 2 d. Both anaerobic and aerobic biological treatment reduced the viscosity from 2.02 cp in the influent to 1.45-1.60 cp, and reduced the molecular weight of PAM using FFF-MACS from 2.17 x 10(7) Da to less than one-third its original size. The removals of both the amide group and carbon chain backbone in the PAM molecule were further supported by the FTIR analysis. In comparison with the other conditions, thermophilic anaerobic treatment exhibited higher efficiency for PAM biodegradation. Batch test excluded the influence of temperature on the molecular weight of PAM over the range 25-55 degrees C, suggesting that cleavage of the main carbon chain backbone was attributed to biological degradation. Our results suggested that high molecular weight PAM was biodegradable, but mineralization did not occur. (C) 2017 Elsevier Ltd. All rights reserved.

Interested yet? Keep reading other articles of 57-00-1, you can contact me at any time and look forward to more communication. Quality Control of 2-(1-Methylguanidino)acetic acid.

In an article, author is Yang, Fengyu, once mentioned the application of 51-35-4, Quality Control of H-Hyp-OH, Name is H-Hyp-OH, molecular formula is C5H9NO3, molecular weight is 131.13, MDL number is MFCD00064320, category is amides-buliding-blocks. Now introduce a scientific discovery about this category.

Oligomerization of the HECT ubiquitin ligase NEDD4-2/NEDD4L is essential for polyubiquitin chain assembly

The NEDD4-2 (neural precursor cell-expressed developmentally down-regulated 4-2) HECT ligase catalyzes polyubiquitin chain assembly by an ordered two-step mechanism requiring two functionally distinct E2 approximate to ubiquitin-binding sites, analogous to the trimeric E6AP/UBE3A HECT ligase. This conserved catalytic mechanism suggests that NEDD4-2, and presumably all HECT ligases, requires oligomerization to catalyze polyubiquitin chain assembly. To explore this hypothesis, we examined the catalytic mechanism of NEDD4-2 through the use of biochemically defined kinetic assays examining rates of I-125-labeled polyubiquitin chain assembly and biophysical techniques. The results from gel filtration chromatography and dynamic light-scattering analyses demonstrate for the first time that active NEDD4-2 is a trimer. Homology modeling to E6AP revealed that the predicted intersubunit interface has an absolutely conserved Phe-823, substitution of which destabilized the trimer and resulted in a 10(4)-fold decrease in k(cat) for polyubiquitin chain assembly. The small-molecule Phe-823 mimic, N-acetylphenylalanyl-amide, acted as a noncompetitive inhibitor (K-i = 8 +/- 1.2 mm) of polyubiquitin chain elongation by destabilizing the active trimer, suggesting a mechanism for therapeutically targeting HECT ligases. Additional kinetic experiments indicated that monomeric NEDD4-2 catalyzes only HECT approximate to ubiquitin thioester formation and monoubiquitination, whereas polyubiquitin chain assembly requires NEDD4-2 oligomerization. These results provide evidence that the previously identified sites 1 and 2 of NEDD4-2 function in trans to support chain elongation, explicating the requirement for oligomerization. Finally, we identified a conserved catalytic ensemble comprising Glu-646 and Arg-604 that supports HECT-ubiquitin thioester exchange and isopeptide bond formation at the active-site Cys-922 of NEDD4-2.

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