Tag: M.W:300-400

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The biological activity of natural alkaloids against herbivores, cancerous cells and pathogens

The growing incidence of microorganisms that resist antimicrobials is a constant concern for the scientific community, while the development of new antimicrobials from new chemical entities has become more and more expensive, time-consuming, and exacerbated by emerging drug-resistant strains. In this regard, many scientists are conducting research on plants aiming to discover possible antimicrobial compounds. The secondary metabolites contained in plants are a source of chemical entities having pharmacological activities and intended to be used for the treatment of different diseases. These chemical entities have the potential to be used as an effective antioxidant, antimutagenic, anticarcinogenic and antimicrobial agents. Among these pharmacologically active entities are the alkaloids which are classified into a number of classes, including pyrrolizidines, pyrrolidines, quinolizidines, indoles, tropanes, piperidines, purines, imidazoles, and isoquinolines. Alkaloids that have antioxidant properties are capable of preventing a variety of degenerative diseases through capturing free radicals, or through binding to catalysts involved indifferent oxidation processes occurring within the human body. Furthermore, these entities are capable of inhibiting the activity of bacteria, fungi, protozoan and etc. The unique properties of these secondary metabolites are the main reason for their utilization by the pharmaceutical companies for the treatment of different diseases. Generally, these alkaloids are extracted from plants, animals and fungi. Penicillin is the most famous natural drug discovery deriving from fungus. Similarly, marines have been used as a source for thousands of bioactive marine natural products. In this review, we cover the medical use of natural alkaloids isolated from a variety of plants and utilized by humans as antibacterial, antiviral, antifungal and anticancer agents. An example for such alkaloids is berberine, an isoquinoline alkaloid, found in roots and stem-bark of Berberis asculin P. Renault plant and used to kill a variety of microorganisms.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ category: catalyst-ligand, Which mentioned a new discovery about 1119-97-7

A Retrospective: 10 Years of Oligo(phenylene-ethynylene) Electrolytes: Demystifying Nanomaterials

In this retrospective, we first reviewed the synthesis of the oligo(phenylene-ethynylene) electrolytes (OPEs) we created in the past 10 years. Since the general antimicrobial activity of these OPEs had been reported in our previous account in Langmuir, we are focusing only on the unusual spectroscopic and photophysical properties of these OPEs and their complexes with anionic scaffolds and detergents in this Feature Article. We applied classical all-atom MD simulations to study the hydrogen bonding environment in the water surrounding the OPEs with and without detergents present. Our finding is that OPEs could form a unit cluster or unit aggregate with a few oppositely charged detergent molecules, indicating that the photostability and photoreactivity of these OPEs might be considerably altered with important consequences to their activity as antimicrobials and fluorescence-based sensors. Thus, in the following sections, we showed that OPE complexes with detergents exhibit enhanced light-activated biocidal activity compared to either OPE or detergent individually. We also found that similar complexes between certain OPEs and biolipids could be used to construct sensors for the enzyme activity. Finally, the OPEs could covalently bind to microsphere surfaces to make a bactericidal surface, which is simpler and more ordered than the surface grafted from microspheres with polyelectrolytes. In the Conclusions and Prospects section, we briefly summarize the properties of OPEs developed so far and future areas for investigation.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Product Details of 1119-97-7, Which mentioned a new discovery about 1119-97-7

Role of kosmotrope-chaotrope interactions at micelle surfaces on the stabilization of lyotropic nematic phases

Abstract.: Three lyotropic quaternary systems of ionic surfactants were prepared to investigate the role of kosmotrope-chaotrope interactions at the micelle surfaces on stabilizing the different nematic phases. The ionic surfactants were potassium laurate (KL), sodium dodecylsulfate (SDS) and tetradecyltrimethylammonium bromide (TDTMABr), where KL is a kosmotrope surfactant, and others are chaotrope. The first system consisted of KL/decanol (DeOH)/water/alkali sulfate and the second of SDS/DeOH/water/alkali sulfate. The third system was prepared by adding sodium salts of chaotropic or kosmotropic anions to the primary mixture of TDTMABr/DeOH/water, separately. The characteristic textures of discotic nematic (ND), biaxial nematic (NB) and calamitic nematic (NC) phases were identified under polarizing light microscope. Laser conoscopy was employed to determine the uniaxial-to-biaxial phase transitions. The kosmotrope-kosmotrope or chaotrope-chaotrope interactions between the head groups of the surfactants and the ions of the electrolytes led to the stabilization of the ND phase. On the other hand, kosmotrope-chaotrope interactions stabilize the NB and/or NC phases. Graphical abstract: [Figure not available: see fulltext.]

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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Preparation of nanocomposites from styrene and modified graphite oxides

Graphite oxide was prepared and modified with several ammonium salts and these modified graphite oxides were used to prepare nanocomposites with polystyrene by in situ polymerization of styrene monomer and by melt blending with polystyrene. Nanocomposites were characterized by X-ray diffraction, cone calorimetry, thermogravimetric analysis and the evaluation of mechanical properties. Nanocomposites are formed by in situ polymerization but not by melt blending; the graphite oxide undergoes thermal degradation at the temperature of melt blending so nanocomposite formation would be unlikely. Mechanical properties of the melt blended nanocomposites are improved relative to the virgin polystyrene while those prepared by in situ polymerization are decreased, except in the case of Young’s Modulus, where melt blended and in situ polymerized materials show similar results.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Application In Synthesis of 4′-Bromo-2,2′:6′,2”-terpyridine, Which mentioned a new discovery about 149817-62-9

COMPOUND FOR ORGANIC ELECTRONIC ELEMENT, ORGANIC ELECTRONIC ELEMENT USING THE SAME, AND AN ELECTRONIC DEVICE THEREOF

A high luminescent efficiency and can emit of the present invention refers to, and/or to enhance the lifetime and an a compound capable, electric device organic using the same electronic device, intended for to provide a. (by machine translation)

Because enzymes can increase reaction rates by enormous factors and tend to be very specific, Application In Synthesis of 4′-Bromo-2,2′:6′,2”-terpyridine, typically producing only a single product in quantitative yield, they are the focus of active research.you can also check out more blogs about 149817-62-9

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of 72556-74-2, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 72556-74-2, Name is Calcium 2-(trimethylammonio)ethyl phosphate chloride tetrahydrate, molecular formula is C5H21CaClNO8P. In a Article£¬once mentioned of 72556-74-2

The development of a choline rich cereal based functional food: Effect of processing and storage

Based on a growing need for additional dietary sources of choline, this research developed a choline rich cereal based functional food. Egg yolk lipids were extracted using ethanol to produce an egg yolk extract (EYE) of high choline content. Corn meal, wheat flour, sugar, salt and EYE were mixed and extrudates made using a twin-screw extruder with an exit temperature of 120?C. Products were packaged and stored at??20?C and room temperature for 12 weeks. Initial processing decreased the total fat and total choline content by up to 30% and 19% respectively. Similarly, tocopherols, tocotrienols and cholesterol decreased after processing. However, the total fat and choline content and tocopherols and tocotrienols did not significantly change during the storage stability study. A shelf-stable choline rich (115?mg/30?g serving) functional food product was developed that could provide a way for consumers to meet their choline requirement.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Related Products of 448-61-3, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 448-61-3, Name is 2,4,6-Triphenylpyrylium tetrafluoroborate, molecular formula is C23H17BF4O. In a Article£¬once mentioned of 448-61-3

Pyrylogens: Synthesis, structural, electrochemical, and photophysical characterization of a new class of electron transfer sensitizers

The synthesis and photophysical properties of a new series of dicationic electron transfer sensitizers have been reported. These new materials, pyrylogens, are hybrids of pyrylium cations and Viologen dications. Electron transfer reactions of neutral organic substrates using these new sensitizers generate radical-cation/radical-cation pairs whose repulsive (repellent) interaction is designed to compete with energy wasting return electron transfer (RET) by enhancing diffusive separation and formation of solvent separated ions. Copyright

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is traditionally divided into organic and inorganic chemistry. Application In Synthesis of (S)-(-)-2,2′-Bis(methoxymethoxy)-1,1′-binaphthyl. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 142128-92-5

Gold(I)-Catalyzed enantioselective synthesis of pyrazolidines, isoxazolidines, and tetrahydrooxazines

(Figure Presented) (Figure Presented) Au-ff on a trip: Chiral ligands (L) and chiral anions [(S)-TriPAg] are employed in the gold(I)-catalyzed enantioselective intramolecular additions of hydrazines and hydroxylamines to allenes. These complementary methods allow access to chiral vinyl isoxazolidines, oxazines, and differentially protected pyrazolidines. PNB = para-nitrobenzoyl.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is traditionally divided into organic and inorganic chemistry. Recommanded Product: 2,4,6-Triphenylpyrylium tetrafluoroborate. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 448-61-3

Acyl Radicals from Acylsilanes: Photoredox-Catalyzed Synthesis of Unsymmetrical Ketones

Acyl radicals were smoothly generated from acylsilanes under photoredox-catalyzed conditions. These radicals were formed upon ultraviolet B (UV-B), solar, or visible light irradiation by using decatungstate and acridinium salts as photocatalysts. Acylation of Michael acceptors and a few styrenes resulted in a smooth preparation of unsymmetrical ketones in yields up to 89%.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Related Products of 1120-02-1, In heterogeneous catalysis, the catalyst is in a different phase from the reactants. At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 1120-02-1, name is OctMAB. In an article£¬Which mentioned a new discovery about 1120-02-1

Mixed Micellization of Cationic/Anionic Surfactants: Role of Matching Water Affinities between Oppositely Charged Headgroups and That between Oppositely Charged Constituent Counterions

To explore the role of matching water affinities between the oppositely charged headgroups, the micellization of cetyltrimethylammonium bromide (CTA+Br-)/sodium dodecanoate (Na+L-) mixed system and the CTA+Br-/sodium dodecylsulfonate (Na+AS-) mixed system has been investigated by the surface tension method and molecular dynamic (MD) simulation. In comparison with the CTA+Br-/Na+L- system, the CTA+Br-/Na+AS- system shows stronger micelle formation ability, smaller critical micelle concentration (cmc), and stronger synergistic effect arising from the higher degree of matching water affinities between the headgroups CTA+ and AS-. To explore the role of matching water affinities between the oppositely charged constituent counterions, the micellization of CTA+X-/Y+L- mixed systems with various counterions has been investigated. The higher degree of matching water affinities between counterions X- and Y+ and the higher degree of mismatching water affinities between headgroups and counterions are unfavorable to the screening effect of counterions on the electrostatic attraction between headgroups CTA+ and L-, leading to stronger micelle formation ability and smaller cmc and vice versa. MD simulation results also indicate that, for the mixed micellization of cationic/anionic surfactants, the role of matching water affinities between oppositely charged headgroups is more important than that between oppositely charged constituent counterions.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI