scholarly journals Characterisation of hexagonal birnessite with a new and rapid synthesis method—comparison with traditional synthesis

RSC Advances ◽  
2019 ◽  
Vol 9 (45) ◽  
pp. 25951-25956 ◽  
Author(s):  
Zhangjie Qin ◽  
Xinmin Chen ◽  
Nanqi Ouyang ◽  
Shuai Lan ◽  
Guanjie Jiang ◽  
...  
Keyword(s):  
Low Cost ◽  
Synthesis Method ◽  
Method Comparison ◽  
Physicochemical Characteristics ◽  
Rapid Synthesis ◽  
New Synthesis ◽  
Cost Characteristics

The new synthesis method of birnessite with rapid, simple, and low cost characteristics proposed in this work can be applied to industry products. Bir-H2O2 have a better physicochemical characteristics than Bir-HCl using traditional synthesis.

Rapid synthesis and bioactivities of 3-(nitromethylene)indolin-2-one analogues

2010 ◽  
Vol 64 (5) ◽  
Author(s):  
Gang Chen ◽  
Xiao-Jiang Hao ◽  
Qian-Yun Sun ◽  
Jian Ding
Keyword(s):  
Lung Cancer ◽  
Pc12 Cells ◽  
Synthesis Method ◽  
Base Catalyst ◽  
Henry Reaction ◽  
Lung Cancer Cell ◽  
Chromatographic Purification ◽  
Rapid Synthesis ◽  
New Synthesis ◽  
Induced Apoptosis

AbstractA new synthesis method of 3-(nitromethylene)indolin-2-one analogues is described, using the Henry reaction of isatin and N-substituted isatins with nitromethane followed by dehydration of the nitroaldol adduct with mesyl chloride. The use of diethylamine (rather than DBU) as the base catalyst in a solvent-free Henry reaction gave the nitroaldol adduct in sufficient purity as to allow its direct dehydration to nitroalkene. Overall yields for this two-step synthesis are satisfactory (typically 50–77 % after chromatographic purification). 3-(Nitromethylene)indolin-2-one analogues are valued protective agents against H2O2-induced apoptosis using PC12 cells, and for their cytotoxicity against the A549 and P388 lung cancer cell lines. One compound, (E)-1-benzyl-3-(nitromethylene)indolin-2-one (VIII), exhibited potent activity in the latter assay.

scholarly journals Applications of transition state calculations in the key cyclization of small molecule natural product synthesis

2021 ◽  
Vol 290 ◽  
pp. 01024
Author(s):  
Rongxiang Qiu
Keyword(s):  
Natural Products ◽  
Reaction Mechanism ◽  
Transition State ◽  
Natural Product ◽  
Thermodynamic Parameters ◽  
Low Cost ◽  
Synthesis Method ◽  
Natural Product Synthesis ◽  
Synthesis Design ◽  
New Synthesis

The diversification of the conformation and configuration of the carbocyclic skeleton of natural products is an important reason for the diversity and complexity of the structure of natural products. The corresponding cyclization synthesis has attracted much attention. Computational chemistry approaches have the advantages of non-toxic, harmless and relatively low cost, and they are increasingly used to model and understand molecular phenomena. The reaction mechanism and thermodynamic parameters determine the feasibility of the cyclization and the enantioselectivity of the cyclization products. The transition state calculations can provide these thermodynamic parameters, which helps to elucidate the cyclization mechanism, calculate the reaction rationality, predict the performance of the new synthesis method and provide a basis for the comprehensive synthesis design.

One-step rapid synthesis of fluorescent silicon nanodots for a hydrogen peroxide-related sensitive and versatile assay based on the inner filter effect

The Analyst ◽  
2019 ◽  
Vol 144 (13) ◽  
pp. 4006-4012 ◽  
Author(s):  
Haoyu Chen ◽  
Li Wu ◽  
Yuqi Wan ◽  
Lulu Huang ◽  
Ningxing Li ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Synthesis Method ◽  
Inner Filter Effect ◽  
Rapid Synthesis ◽  
Biochemical Sensor ◽  
Filter Effect ◽  
New Synthesis ◽  
One Step

This work presents a new synthesis method of fluorescent SiNDs which was further applied in the construction of hydrogen peroxide-related sensitive and versatile biochemical sensor.

Synthesis, Analytical Characterization and Spectroscopic Investigation of Chloramphenicol Impurity A for the Quality Control of Chloramphenicol and its Formulation as Per International Compendium

2020 ◽  
Vol 17 (5) ◽  
pp. 382-388
Author(s):  
Aparna Wadhwa ◽  
Faraat Ali ◽  
Sana Parveen ◽  
Robin Kumar ◽  
Gyanendra N. Singh
Keyword(s):  
Quality Control ◽  
Synthesis Method ◽  
Analytical Techniques ◽  
International Markets ◽  
Therapeutic Effects ◽  
Reference Standard ◽  
Working Standard ◽  
Prior Art ◽  
New Synthesis ◽  
Synthetic Procedure

Objective: The main aim of the present work is to synthesize chloramphenicol impurity A (CLRMIMP- A) in the purest form and its subsequent characterization by using a panel of sophisticated analytical techniques (LC-MS, DSC, TGA, NMR, FTIR, HPLC, and CHNS) to provide as a reference standard mentioned in most of the international compendiums, including IP, BP, USP, and EP. The present synthetic procedure has not been disclosed anywhere in the prior art. Methods: A simple, cheaper, and new synthesis method was described for the preparation of CLRM-IMP-A. It was synthesized and characterized by FTIR, DSC, TGA, NMR (1H and 13C), LC-MS, CHNS, and HPLC. Results: CLRM-IMP-A present in drugs and dosage form can alter the therapeutic effects and adverse reaction of a drug considerably, it is mandatory to have a precise method for the estimation of impurities to safeguard the public health. Under these circumstances, the presence of CLRM-IMP-A in chloramphenicol (CLRM) requires strict quality control to satisfy the specified regulatory limit. The synthetic impurity obtained was in the pure form to provide a certified reference standard or working standard to stakeholders with defined potency. Conclusion: The present research describes a novel technique for the synthesis of pharmacopoeial impurity, which can help in checking/controlling the quality of the CLRM in the international markets.

scholarly journals Smart Collaborative Performance-Induced Parameter Identification Algorithms for Synchronous Reluctance Machine Magnetic Model

2021 ◽  
Vol 13 (8) ◽  
pp. 4379
Author(s):  
Linjie Ren ◽  
Guobin Lin ◽  
Yuanzhe Zhao ◽  
Zhiming Liao
Keyword(s):  
Low Cost ◽  
Parameter Extraction ◽  
Synchronous Reluctance Machine ◽  
Fitness Evaluation ◽  
Reluctance Machine ◽  
Candidate Solution ◽  
Collaborative Performance ◽  
Magnetic Model ◽  
Quantitative Results ◽  
Cost Characteristics

In rail transit traction, due to the remarkable energy-saving and low-cost characteristics, synchronous reluctance motors (SynRM) may be a potential substitute for traditional AC motors. However, in the parameter extraction of SynRM nonlinear magnetic model, the accuracy and robustness of the metaheuristic algorithm is restricted by the excessive dependence on fitness evaluation. In this paper, a novel probability-driven smart collaborative performance (SCP) is defined to quantify the comprehensive contribution of candidate solution in current population. With the quantitative results of SCP as feedback in-formation, an algorithm updating mechanism with improved evolutionary quality is established. The allocation of computing resources induced by SCP achieves a good balance between exploration and exploitation. Comprehensive experiment results demonstrate better effectiveness of SCP-induced algorithms to the proposed synchronous reluctance machine magnetic model. Accuracy and robustness of the proposed algorithms are ranked first in the comparison result statistics with other well-known algorithms.

scholarly journals Magnetic iron oxide/clay nanocomposites for adsorption and catalytic oxidation in water treatment applications

2020 ◽  
Vol 18 (1) ◽  
pp. 1148-1166
Author(s):  
Ganjar Fadillah ◽  
Septian Perwira Yudha ◽  
Suresh Sagadevan ◽  
Is Fatimah ◽  
Oki Muraza
Keyword(s):  
Iron Oxide ◽  
Water Treatment ◽  
Photocatalytic Oxidation ◽  
Low Cost ◽  
Synthesis Method ◽  
Chemical Oxidation ◽  
Magnetic Iron Oxide ◽  
Oxidation Processes ◽  
Recent Developments ◽  
Physical And Chemical

AbstractPhysical and chemical methods have been developed for water and wastewater treatments. Adsorption is an attractive method due to its simplicity and low cost, and it has been widely employed in industrial treatment. In advanced schemes, chemical oxidation and photocatalytic oxidation have been recognized as effective methods for wastewater-containing organic compounds. The use of magnetic iron oxide in these methods has received much attention. Magnetic iron oxide nanocomposite adsorbents have been recognized as favorable materials due to their stability, high adsorption capacities, and recoverability, compared to conventional sorbents. Magnetic iron oxide nanocomposites have also been reported to be effective in photocatalytic and chemical oxidation processes. The current review has presented recent developments in techniques using magnetic iron oxide nanocomposites for water treatment applications. The review highlights the synthesis method and compares modifications for adsorbent, photocatalytic oxidation, and chemical oxidation processes. Future prospects for the use of nanocomposites have been presented.

scholarly journals Green Synthesis of Copper Nanoparticles Using Cotton

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1906
Author(s):  
Marissa Pérez-Alvarez ◽  
Gregorio Cadenas-Pliego ◽  
Odilia Pérez-Camacho ◽  
Víctor E. Comparán-Padilla ◽  
Christian J. Cabello-Alvarado ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Copper Nanoparticles ◽  
Uv Spectroscopy ◽  
Synthesis Method ◽  
Crystallinity Index ◽  
Reaction Conditions ◽  
New Synthesis ◽  
Water As Solvent ◽  
Characterization Studies ◽  
Xrd Patterns

Copper nanoparticles (CuNP) were obtained by a green synthesis method using cotton textile fibers and water as solvent, avoiding the use of toxic reducing agents. The new synthesis method is environmentally friendly, inexpensive, and can be implemented on a larger scale. This method showed the cellulose capacity as a reducing and stabilizing agent for synthetizing Cellulose–Copper nanoparticles (CCuNP). Nanocomposites based on CCuNP were characterized by XRD, TGA, FTIR and DSC. Functional groups present in the CCuNP were identified by FTIR analysis, and XRD patterns disclosed that nanoparticles correspond to pure metallic Cu°, and their sizes are at a range of 13–35 nm. Results demonstrated that CuNPs produced by the new method were homogeneously distributed on the entire surface of the textile fiber, obtaining CCuNP nanocomposites with different copper wt%. Thus, CuNPs obtained by this method are very stable to oxidation and can be stored for months. Characterization studies disclose that the cellulose crystallinity index (CI) is modified in relation to the reaction conditions, and its chemical structure is destroyed when nanocomposites with high copper contents are synthesized. The formation of CuO nanoparticles was confirmed as a by-product, through UV spectroscopy, in the absorbance range of 300–350 nm.

scholarly journals Synthesis method comparison of compositionally complex rare‐earth based Ruddlesden–Popper n=1 T′ ‐type cuprates

2021 ◽  
Author(s):  
Brianna L. Musicó ◽  
Quinton Wright ◽  
Cordell Delzer ◽  
T. Zac Ward ◽  
Claudia J. Rawn ◽  
...  
Keyword(s):  
Rare Earth ◽  
Synthesis Method ◽  
Method Comparison

A New Synthesis Method for Producing Si3N4Whiskers by Heat Treating Porous Si Objects

2008 ◽  
Vol 91 (11) ◽  
pp. 3800-3802 ◽  
Author(s):  
Hu Hanjun ◽  
Zhou Wan-cheng ◽  
Luo Fa ◽  
Zhu Dong-Mei ◽  
Xu Jie
Keyword(s):  
Synthesis Method ◽  
Heat Treating ◽  
Porous Si ◽  
New Synthesis
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