Hairy Particles with Immobilized Enzymes: Impact of Particle Topology on the Catalytic Activity

2018 ◽  
Vol 11 (1) ◽  
pp. 1645-1654 ◽  
Author(s):  
Claudia Marschelke ◽  
Martin Müller ◽  
Dorina Köpke ◽  
Anke Matura ◽  
Marco Sallat ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Immobilized Enzymes

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.

Catalytic Activity in Organic Solvents and Stability of Immobilized Enzymes Depend on the Pore Size and Surface Characteristics of Mesoporous Silica

2000 ◽  
Vol 12 (11) ◽  
pp. 3301-3305 ◽  
Author(s):  
Haruo Takahashi ◽  
Bo Li ◽  
Toshiya Sasaki ◽  
Chie Miyazaki ◽  
Tsutomu Kajino ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Organic Solvents ◽  
Surface Characteristics ◽  
Immobilized Enzymes

scholarly journals Different methods and carriers for immobilization cellulase from Trichoderma viride and its remaining activity

2017 ◽  
Vol 4 (1) ◽  
pp. 9 ◽  
Author(s):  
Abdul Sattar Jabbar Taha
Keyword(s):  
Catalytic Activity ◽  
Cation Exchange ◽  
Anion Exchanger ◽  
Specific Activity ◽  
Trichoderma Viride ◽  
Immobilized Enzymes ◽  
Suitable Method ◽  
Native Enzyme

Objective: Many methods for enzymes immobilization and large number of carriers for immobilized enzymes, there are many benefits and diffeculties for immobilization, so the objective of this paper is to determine the suitable method and carrier for cellulase immobilization.Methods: Three methods used for immobilization which they adsorption, Glutaraldehyde and modified glutaraldehyde using two different carriers the first anion exchanger AM-21-A, and the second cation exchange fiber VION KN -1.Results: The result shows that the degree of saving catalytic activity for immobilized and free cellulase were 35, 55, and 75% for the three methods respectively and The result of degree maintain of specific activity for native enzyme were 57%, 42%, for the two carriers VION KN-1, AM-21-A respectively.Conclusions: It can be concluded that the modified glutaraldehyde is the best method for cellulase immobilization and VION KN-1 is better carrier than AM-21-A.

Electrochemical control of the catalytic activity of immobilized enzymes

2020 ◽  
Vol 56 (89) ◽  
pp. 13800-13803
Author(s):  
Vasantha Krishna Kadambar ◽  
Madhura Bellare ◽  
Paolo Bollella ◽  
Evgeny Katz ◽  
Artem Melman
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Immobilized Enzymes ◽  
Electrochemical Reactions ◽  
Electrochemical Control ◽  
Activity Of Enzymes ◽  
Local Ph

Regulation of the catalytic activity of enzymes immobilized on carbon nanotube electrodes was achieved by changing their local pH environment using electrochemical reactions.

High resolution electron microscopy of lanthanum phosphate crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 274-275
Author(s):  
J. C. Wheatley ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
High Resolution ◽  
Petroleum Industry ◽  
High Resolution Electron Microscopy ◽  
Lanthanum Phosphate ◽  
Good Catalyst ◽  
Resolution Electron ◽  
Good Catalytic Activity ◽  
Physical And Chemical

Rare-earth phosphates are of particular interest because of their catalytic properties associated with the hydrolysis of many aromatic chlorides in the petroleum industry. Lanthanum phosphates (LaPO4) which have been doped with small amounts of copper have shown increased catalytic activity (1). However the physical and chemical characteristics of the samples leading to good catalytic activity are not known.Many catalysts are amorphous and thus do not easily lend themselves to methods of investigation which would include electron microscopy. However, the LaPO4, crystals are quite suitable samples for high resolution techniques.The samples used were obtained from William L. Kehl of Gulf Research and Development Company. The electron microscopy was carried out on a JEOL JEM-100B which had been modified for high resolution microscopy (2). Standard high resolution techniques were employed. Three different sample types were observed: 669A-1-5-7 (poor catalyst), H-L-2 (good catalyst) and 27-011 (good catalyst).

The design and catalytic performance of molybdenum active sites on an MCM-41 framework for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran

2019 ◽  
Vol 9 (3) ◽  
pp. 811-821 ◽  
Author(s):  
Zhao-Meng Wang ◽  
Li-Juan Liu ◽  
Bo Xiang ◽  
Yue Wang ◽  
Ya-Jing Lyu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Mcm 41

The catalytic activity decreases as –(SiO)3Mo(OH)(O) > –(SiO)2Mo(O)2 > –(O)4–MoO.

Sign in / Sign up

Export Citation Format

Share Document