Extending the family of quinolone antibacterials to new copper derivatives: self-assembly, structural and topological features, catalytic and biological activity

2018 ◽  
Vol 42 (24) ◽  
pp. 19644-19658 ◽  
Author(s):  
Panagiotis Xerras ◽  
Anna-Maria Bacharidou ◽  
Stavros Kalogiannis ◽  
Franc Perdih ◽  
Marina V. Kirillova ◽  
...  
Keyword(s):  
Biological Activity ◽  
Catalytic Activity ◽  
Self Assembly ◽  
Topological Features ◽  
The Family

New copper(ii) compounds with quinolone pefloxacin were synthesized and fully characterized; they exhibit notable catalytic activity and promising biological profiles.

scholarly journals Enzyme Immobilization on Maghemite Nanoparticles with Improved Catalytic Activity: An Electrochemical Study for Xanthine

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1776 ◽  
Author(s):  
Massimiliano Magro ◽  
Davide Baratella ◽  
Andrea Venerando ◽  
Giulia Nalotto ◽  
Caroline R. Basso ◽  
...  
Keyword(s):  
Biological Activity ◽  
Catalytic Activity ◽  
Enzyme Immobilization ◽  
Self Assembly ◽  
Immobilized Enzymes ◽  
Biological Properties ◽  
Oxide Nanoparticles ◽  
Electrochemical Studies ◽  
Maghemite Nanoparticles ◽  
Surface Active

Generally, enzyme immobilization on nanoparticles leads to nano-conjugates presenting partially preserved, or even absent, biological properties. Notwithstanding, recent research demonstrated that the coupling to nanomaterials can improve the activity of immobilized enzymes. Herein, xanthine oxidase (XO) was immobilized by self-assembly on peculiar naked iron oxide nanoparticles (surface active maghemite nanoparticles, SAMNs). The catalytic activity of the nanostructured conjugate (SAMN@XO) was assessed by optical spectroscopy and compared to the parent enzyme. SAMN@XO revealed improved catalytic features with respect to the parent enzyme and was applied for the electrochemical studies of xanthine. The present example supports the nascent knowledge concerning protein conjugation to nanoparticle as a means for the modulation of biological activity.

Current Advances in the Biological Activity of Polysaccharides in Dendrobium with Intriguing Therapeutic Potential

2018 ◽  
Vol 25 (14) ◽  
pp. 1663-1681 ◽  
Author(s):  
Chun-Ting Lee ◽  
Heng-Chun Kuo ◽  
Yung-Hsiang Chen ◽  
Ming-Yen Tsai
Keyword(s):  
Biological Activity ◽  
Therapeutic Potential ◽  
Biological Activities ◽  
Biological Effects ◽  
Herbal Medicines ◽  
Research Field ◽  
Protective Effects ◽  
Pharmacological Effects ◽  
The Family ◽  
Anti Tumor Activity

The polysaccharides in many plants are attracting worldwide attention because of their biological activities and medical properties, such as anti-viral, anti-oxidative, antichronic inflammation, anti-hypertensive, immunomodulation, and neuron-protective effects, as well as anti-tumor activity. Denodrobium species, a genus of the family orchidaceae, have been used as herbal medicines for hundreds of years in China due to their pharmacological effects. These effects include nourishing the Yin, supplementing the stomach, increasing body fluids, and clearing heat. Recently, numerous researchers have investigated possible active compounds in Denodrobium species, such as lectins, phenanthrenes, alkaloids, trigonopol A, and polysaccharides. Unlike those of other plants, the biological effects of polysaccharides in Dendrobium are a novel research field. In this review, we focus on these novel findings to give readers an overall picture of the intriguing therapeutic potential of polysaccharides in Dendrobium, especially those of the four commonly-used Denodrobium species: D. huoshanense, D. offininale, D. nobile, and D. chrysotoxum.

Effect of Preparation Methods of HPW/SiO2 Mesoporous Composites on its Catalytic Performance in Fuel Oils Desulfurization

2010 ◽  
Vol 148-149 ◽  
pp. 924-928
Author(s):  
Xue Min Yan ◽  
Yuan Zhu Mi
Keyword(s):  
Catalytic Activity ◽  
Self Assembly ◽  
Electrostatic Force ◽  
Oxidative Desulfurization ◽  
Strong Acid ◽  
Catalytic Performance ◽  
Synthesis Mechanism ◽  
Base Interaction ◽  
Preparation Methods ◽  
Oh Groups

Two kinds of mesoporous HPW/SiO2 composites, which have been synthesized respectively by the amino-functionalized (AF) method and evaporation-induced self-assembly (EISA) method, have been used as catalysts in the oxidative desulfurization process of dibenzothiophene(DBT). The catalytic performance results show that the catalyst synthesized by EISA method holds higher catalytic activity than that synthesized by the AF method. The difference of catalytic activity can be attributed to the different synthesis mechanism of two kinds of composites. In the AF method, the bonding force between HPW and SiO2 is strong acid-base interaction, which damages the Keggin structure. Whereas in the EISA process, electrostatic force and hydrogen bonds between W=O groups and Si-OH groups are main bonding forces. The hydrogen bond holds the electron-withdrawing effect, which increases the activity of nonbonding W=O groups in HPW and then results in the enhancement of the catalytic activity.

scholarly journals Direct, single-step synthesis of hierarchical zeolites without secondary templating

2015 ◽  
Vol 3 (3) ◽  
pp. 1298-1305 ◽  
Author(s):  
Zhuopeng Wang ◽  
Chao Li ◽  
Hong Je Cho ◽  
Shih-Chieh Kung ◽  
Mark A. Snyder ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mass Transport ◽  
Self Assembly ◽  
Single Step ◽  
Hierarchical Zeolites ◽  
Hierarchical Zeolite ◽  
Initial Stage ◽  
Zeolite Precursors

Hierarchical ZSM-5 with a shell of stacked coffin-shaped crystals and a core of nanocrystal aggregates was synthesized by controlling the formation and self-assembly of zeolite precursors formed in the initial stage of crystallization. The formed hierarchical zeolite shows superior catalytic activity for reaction involving bulky molecules due to enhanced mass transport.

Construction of solvent-dependent self-assembled porous Ni(ii)-coordinated frameworks as effective catalysts for chemical transformation of CO2

RSC Advances ◽  
2016 ◽  
Vol 6 (109) ◽  
pp. 108010-108016 ◽  
Author(s):  
Zhen Zhou ◽  
Lu Yang ◽  
Yefei Wang ◽  
Cheng He ◽  
Tao Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Chemical Transformation ◽  
Self Assembly ◽  
Ambient Conditions ◽  
Heterogeneous Catalytic ◽  
Self Assembled

Two types of Ni(ii)-based coordinated frameworks have been solvothermally synthesized via solvent driven self-assembly, showing efficient heterogeneous catalytic activity toward cycloaddition of CO2 with epoxides under ambient conditions.

A novel ternary CuO decorated Ag3AsO4/GO hybrid as a Z-scheme photocatalyst for enhanced degradation of phenol under visible light

2017 ◽  
Vol 41 (3) ◽  
pp. 1380-1389 ◽  
Author(s):  
Md. Rakibuddin ◽  
Subrata Mandal ◽  
Rajakumar Ananthakrishnan
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Self Assembly ◽  
Assembly Method ◽  
Enhanced Degradation

A novel Z-scheme ternary CuO/Ag3AsO4/GO hybrid having significant visible light catalytic activity and stability is successfully synthesized via a self-assembly method.

In situ fabrication of multifunctional gold–amino acid superstructures based on self-assembly

2019 ◽  
Vol 55 (27) ◽  
pp. 3967-3970 ◽  
Author(s):  
Xuejiao Yang ◽  
Bohao Yang ◽  
Yuefei Wang ◽  
Wei Qi ◽  
Qiguo Xing ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Amino Acid ◽  
Self Assembly ◽  
Au Nps ◽  
In Situ Fabrication ◽  
Photothermal Effects

Based on self-assembly and biomineralization, Au NPs@ferrocene–tryptophan (Fc-W) superstructures were fabricated, exhibiting efficient photothermal effects and catalytic activity.

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