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PubMed Journals Articles About "Global Zeolite Market Size Study Product Natural Synthetic" RSS

19:22 EST 17th January 2020 | BioPortfolio

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Showing "Global Zeolite Market Size study Product Natural Synthetic" PubMed Articles 1–25 of 74,000+

Recent progress on the total syntheses of macrocyclic diamine alkaloids.

Covering: 2006 to 2019Macrocyclic diamine alkaloids derived from 3-alkyldihydropyridine dimers comprise a diverse and highly complex family of natural products. The macrocyclic and caged structural features of these alkaloids have inspired many creative solutions from the synthetic organic community over the past 30 years. This review will cover the successful synthetic campaigns over the past decade, with a focus on (1) key bond disconnections and advances and (2) remaining challenges and opportunities for...


Laser irradiation for controlling size of TiO-Zeolite nanocomposite in removal of 2,4-dichlorophenoxyacetic acid herbicide.

This study focused on the synthesis of TiO-Zeolite nanocomposite through a sol-gel approach. The decrease in the size of the nanocomposite is considered a primary parameter to improve photocatalytic activity. In this regard, fabricated samples were exposed to laser irradiation (532 nm) for four different time intervals in order to investigate the size variation of the nanocomposite. FTIR, UV-Vis, XRD, DLS, SEM and EDX analyses were applied to characterize and determine the size of the products. An optimized...

Convergent Total Syntheses of (-)-Rubriflordilactone B and (-)-pseudo-Rubriflordilactone B.

A highly convergent strategy for the synthesis of the natural product (-)-rubriflordilactone B, and the proposed structure of (-)-pseudo-rubriflordilactone B, is described. Late stage coupling of diynes containing the respective natural product FG rings with a common AB ring aldehyde precedes rhodium-catalyzed [2+2+2] alkyne cyclotrimerization to form the natural product skeleton, with the syntheses completed in just one further operation. This work resolves the uncertainty surrounding the identity of pseud...


Synthesis and Structure-Activity Relationship Studies of C2-Modified Analogs of the Antimycobacterial Natural Product Pyridomycin.

A series of derivatives of the antimycobacterial natural product pyridomycin have been prepared with the C2-side chain attached to the macrocyclic core structure by a C-C single bond, in place of the synthetically more demanding enol ester double bond found in the natural product. Hydrophobic C2-substituents of sufficient size generally provide for potent anti-Mtb activity of these dihydropyridomycins (MIC values around 2.5 μM), with several analogs thus approaching the activity of natural pyridomycin. Sur...

Effect of Cu(II) on adsorption of tetracycline by natural zeolite: performance and mechanism.

The purpose of this study was to investigate the effect of Cu(II) on the adsorption performance and mechanism of tetracycline (TC) adsorption by natural zeolite (NZ) in aqueous solution. Low levels of Cu(II) (

In vitro Packaging Mediated One-Step Targeted Cloning of Natural Product Pathway.

Direct cloning of natural product pathways for efficient refactoring and heterologous expression has become an important strategy for microbial natural product research and discovery, especially for those kept silent or poorly expressed in the original strains. Accordingly, the development of convenient and efficient cloning approaches is becoming increasingly necessary. Here we presented an in vitro packaging mediated cloning approach that combines CRISPR/Cas9 system with in vitro λ packaging system, for ...

Synthesis and biological evaluation of cis-restrained carbocyclic combretastatin A-4 analogs: Influence of the ring size and saturation on cytotoxic properties.

Combretastatin A-4 (CA-4) is a highly cytotoxic natural product and several derivatives have been prepared which underwent clinical trial. These investigations revealed that the cis-stilbene moiety of the natural product is prone to undergo cis/trans isomerization under physiological conditions, reducing the overall activity of the drug candidates. Herein, we report the preparation of cis-restrained carbocyclic analogs of CA-4. The compounds, which differ by the size and hybridization of the carbocyclic rin...

Soil organic matter and phosphate sorption on natural and synthetic Fe oxides under in situ conditions.

Iron (Fe) oxides in soils are strong sorbents for environmentally important compounds like soil organic matter (SOM) or phosphate, while sorption under field conditions is still poorly understood. We installed polyvinyl chloride plastic bars which have been coated either with synthetic Fe or manganese (Mn) oxides for 30 days in a redoximorphic soil. A previous study revealed the formation of newly formed ('natural') Fe oxides along the Mn oxide coatings. This enables us to differentiate between sorption occ...

NaPLeS: a natural products likeness scorer-web application and database.

Natural products (NPs), often also referred to as secondary metabolites, are small molecules synthesised by living organisms. Natural products are of interest due to their bioactivity and in this context as starting points for the development of drugs and other bioactive synthetic products. In order to select compounds from virtual libraries, Ertl et al. developed a natural product likeness score which was later published as an open data, open source implementation. Here we present NaPLeS, an easily portabl...

Ion Mobility Mass Spectrometry as an Efficient Tool for Identification of Streptorubin B in M145.

Ion mobility spectrometry was utilized to corroborate the identity of streptorubin B () as the natural product produced by . Natural product was initially assigned as butylcycloheptylprodigiosin (), and only relatively recently was this assignment clarified. We present additional evidence of this assignment by comparing collisional cross sections (Ω) of synthetic standards of , , and metacycloprodigiosin () to the cyclic prodiginine produced by . Calculated theoretical Ω values demonstrate that cyclic pr...

Cytotoxicity and Anti-inflammatory Properties of Apigenin-Derived Isolaxifolin.

The rare flavonoid isolaxifolin, a potent insecticide, has been touted as a potential grain-protecting agent. In order to assess any impact of this natural product on human health and to explore its various other biological properties, we have established a semisynthesis from the simpler but structurally related and more abundant natural product apigenin. The five-step reaction sequence has provided, for the first time, sufficient material for an in-depth evaluation of the cytotoxic properties of the title ...

Simultaneous removal of ammonia and phosphate using green synthesized iron oxide nanoparticles dispersed onto zeolite.

Since elevated levels of common nutrients, such as ammonia and phosphate, in natural water bodies (lakes and rivers) can lead to significant deterioration of pristine water ecosystems due to eutrophication, new and cost-effectiveness remediation strategies are urgently required. This work investigated the feasibility of using green synthesized iron oxide nanoparticles dispersed onto zeolite by eucalyptus leaf extracts (EL-MNP@zeolite), to simultaneously remove ammonia and phosphate from aqueous solutions. S...

Catalytic pyrolysis of soda lignin over zeolites using pyrolysis gas chromatography-mass spectrometry.

Catalytic fast pyrolysis of soda lignin was examined at different temperatures (500,600,700,800 and 900 °C) in the presence of three zeolites with different Si/Al ratio using the Py-GC/MS in order to investigate best catalytic system. The three zeolites are y-zeolite (8-9), mordenite (15-17), ZSM-5 (30-40), which have static pore sizes 0.74, 0.65, and 0.59 nm respectively. The shape and acidity of zeolites, as well as pyrolysis temperature, have a significant effect on product distribution in catalytic...

Radiometric characterization of zeolite minerals used in many industries and assessment of radiological risks.

Zeolites are important additives materials which are widely used in different industries such as construction, paper, paint, agriculture, textile, and fertilizer. In this study, radiometric characterization of natural zeolite samples collected from four zeolite open quarries in Western Anatolia in Turkey were determined using a gamma-ray spectrometry with high purity germanium detector. The radiological risks due to the use of zeolite samples as raw materials in cement and concrete production was assessed f...

Alginate beads impregnated with magnetic Chitosan@Zeolite nanocomposite for cationic methylene blue dye removal from aqueous solution.

In this study, magnetic bionanocomposite of sodium alginate (an anionic polysaccharide), chitosan (a cationic polysaccharide), impregnated with natural zeolite, and cross-linked with glutaraldehyde and CaCl in order to improve the stability, are prepared and used to methylene blue removal from aqueous solution. The synthesized magnetic Zeolite/Chitosan/Alginate (MZ/CS/AL) bionanocomposite was analyzed and characterized by FeSEM, EDX, XRD, BET surface area analysis, VSM, TGA, and FTIR techniques. The efficie...

Synthesis and characterization of nanoparticles and composites as bactericides.

In the present study, SiO-TiO hybrid nanomaterial and zeolite-TiO (Z-TiO) composites were synthesized by the sol-gel method. Then, the antibacterial activity of the above-mentioned synthesized materials, SiO and zeolite (Z) was investigated by the disk diffusion method using Echerichia coli and Enterobacter aerogenes as test microorganisms. All the materials showed antibacterial activity against E. coli with 7.2, 10.7, 3.5 and 8.2 mm of inhibition zone for SiO-TiO hybrid nanomaterial, SiO, zeolite and Z-T...

Quantitative analysis of adsorption and desorption of volatile organic compounds on reusable zeolite filters using gas chromatography.

In this study, we propose a method to quantitatively analyze the concentration of VOCs adsorbed on zeolite filters via gas chromatography (GC). The sampled VOCs from the filters with ethanol as a solution were characterized using GC to determine the concentration of the adsorbed VOCs by comparing the areas of GC peaks of the detected VOCs and ethanol. The proposed method also enabled determination of the desorption (regeneration) conditions of the zeolite filters according to heating temperature and time fo...

Increased retention of available nitrogen during thermal drying of solids of digested sewage sludge and manure by acid and zeolite addition.

Thermal drying is an increasingly common post-treatment for digestate-solids, but prone to N losses via ammonia (NH) volatilization. Acidification with strong acids prior to drying may retain ammonium (NH) in the solids. Natural zeolites can provide adsorption sites for exchangeable cations as ammonium and porosity for free ammonia, which has the potential to contribute to higher N retention in the dried solids. The present study investigated whether the zeolite addition increases NH-N retention during ther...

Identification of a thermal degradation product of CUMYL-PEGACLONE and its detection in biological samples.

The structural diversity of synthetic cannabinoids makes it a challenging task to have a comprehensive screening method for this class of drugs. The difficulty is increased by the fact that some synthetic cannabinoids undergo thermal decomposition during common routes of administration, such as smoking or vaping. CUMYL-PEGACLONE is a relatively new synthetic cannabinoid which has a structural variant from most other synthetic cannabinoids: a γ-carbolinone core. To investigate its thermal stability, CUMYL-P...

The intelligibility and comprehension of synthetic natural speech in dyslexic students.

Despite the growing amount of data on the 'synthetic speech perception' by people with no disabilities, there has been limited research on the intelligibility and comprehension of synthetic speech systems by dyslexics. This study investigated the intelligibility and comprehension of synthetic versus natural speech in Greek dyslexic students. Forty three dyslexic students were presented with various acoustic stimuli (words, sentences, texts) both in synthetic and natural speech. The data analysis has shown...

Growth and nutrient removal efficiency of duckweed (lemna minor) from synthetic and dumpsite leachate under artificial and natural conditions.

Sustainable management of leachate produced from the dumpsite is one of the major concerns in developing countries Aquatic plants such as duckweed have the potential to remove pollutants from wastewater which can also be cost-effective and feasible options for leachate treatment. Therefore, the objective of our present study was to examine the growth and nutrient removal efficiency of duckweed (Lemna minor) on leachate. Three tests were performed each by growing lemna minor on synthetic leachate under contr...

Impact of the Spatial Organization of Bifunctional Metal-Zeolite Catalysts for Hydroisomerization of Light Alkanes.

To improve the product selectivity by controlling the spatial organization of functional sites at nanoscale is a critical challenge in bifunctional catalysis. Herein, we design a series of composite bifunctional catalysts consisting of one-dimensional zeolites (ZSM-22 and mordenite) and γ-alumina binder, with platinum particles controllably deposited either on the alumina binder or inside the zeolite crystals. The hydroisomerization of n-heptane demonstrates that the bifunctional catalysts with platinum pa...

Synthetic α-Tocopherol, Compared with Natural α-Tocopherol, Downregulates Myelin Genes in Cerebella of Adolescent Ttpa-null Mice.

Vitamin E (α-tocopherol; α-T) deficiency causes spinocerebellar ataxia. α-T supplementation improves neurological symptoms, but little is known about the differential bioactivities of natural versus synthetic α-T during early life.

Integrating drug- and formulation-related properties with gastrointestinal tract variability using a product-specific particle size approach: case example ibuprofen.

In the present study an in vitro-in vivo extrapolation of dissolution integrated to a physiologically-based pharmacokinetics modeling approach, considering a product-specific particle size distribution and a self-buffering effect of the drug, is introduced and appears to be a promising translational modeling strategy to support drug product development, manufacturing changes and setting clinically relevant specifications for immediate release formulations containing ibuprofen and other weak acids with simil...

Assessment of Anti-carcinogenic Effect of Pomegranate in Oral Squamous Cell Carcinoma (Pre-clinical Study).

The survival portion of patients treated from oral cancer isn't in progress. This is why researchers are continuously looking for new anti-cancer drugs either natural product or natural product derivatives. Studies have shown that pomegranate and its constituents might have an anti-tumorigenic effect. So the aim of this study was to assess the anticarcinogenic roles of pomegranate on oral squamous cell carcinoma as an adjuvant of chemotherapy.


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