scholarly journals Development of Effective Lipase-Hybrid Nanoflowers Enriched with Carbon and Magnetic Nanomaterials for Biocatalytic Transformations

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 808 ◽  
Author(s):  
Renia Fotiadou ◽  
Michaela Patila ◽  
Mohamed Amen Hammami ◽  
Apostolos Enotiadis ◽  
Dimitrios Moschovas ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Immobilized Lipase ◽  
Aqueous Media ◽  
Deep Eutectic Solvents ◽  
Operational Stability ◽  
Magnetic Nanomaterials ◽  
Energy Dispersion Spectroscopy ◽  
Simple Method ◽  
Pseudozyma Antarctica ◽  
Carbon Based Nanomaterials

In the present study, hybrid nanoflowers (HNFs) based on copper (II) or manganese (II) ions were prepared by a simple method and used as nanosupports for the development of effective nanobiocatalysts through the immobilization of lipase B from Pseudozyma antarctica. The hybrid nanobiocatalysts were characterized by various techniques including scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The effect of the addition of carbon-based nanomaterials, namely graphene oxide and carbon nanotubes, as well as magnetic nanoparticles such as maghemite, on the structure, catalytic activity, and operational stability of the hybrid nanobiocatalysts was also investigated. In all cases, the addition of nanomaterials during the preparation of HNFs increased the catalytic activity and the operational stability of the immobilized biocatalyst. Lipase-based magnetic nanoflowers were effectively applied for the synthesis of tyrosol esters in non-aqueous media, such as organic solvents, ionic liquids, and environmental friendly deep eutectic solvents. In such media, the immobilized lipase preserved almost 100% of its initial activity after eight successive catalytic cycles, indicating that these hybrid magnetic nanoflowers can be applied for the development of efficient nanobiocatalytic systems.

scholarly journals Impregnated palladium on magnetite as a water compatible catalyst for the cycloisomerization of alkynoic acid derivatives

2018 ◽  
Vol 20 (9) ◽  
pp. 2151-2157 ◽  
Author(s):  
Beatriz Saavedra ◽  
Juana M. Pérez ◽  
María J. Rodríguez-Álvarez ◽  
Joaquín García-Álvarez ◽  
Diego J. Ramón
Keyword(s):  
Catalytic Activity ◽  
Aqueous Media ◽  
Deep Eutectic Solvents ◽  
Metal Catalyst

This work describes the catalytic activity of palladium(ii) species in the cycloisomerization of alkynoic acids and their derivatives in aqueous media as well as in Deep Eutectic Solvents (DESs), with one of the lowest metal catalyst loadings reported so far in the literature.

Immobilized Nanoparticles-Mediated Enzymatic Hydrolysis of Cellulose for Clean Sugar Production: A Novel Approach

2019 ◽  
Vol 15 (3) ◽  
pp. 296-303 ◽  
Author(s):  
Swapnil Gaikwad ◽  
Avinash P. Ingle ◽  
Silvio Silverio da Silva ◽  
Mahendra Rai
Keyword(s):  
Catalytic Activity ◽  
Enzymatic Hydrolysis ◽  
Immobilized Enzyme ◽  
Free Enzyme ◽  
Magnetic Nanomaterials ◽  
Sugar Production ◽  
Cellulase Enzyme ◽  
Enzymatic Hydrolysis Of Cellulose ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

Background: Enzymatic hydrolysis of cellulose is an expensive approach due to the high cost of an enzyme involved in the process. The goal of the current study was to apply magnetic nanomaterials as a support for immobilization of enzyme, which helps in the repeated use of immobilized enzyme for hydrolysis to make the process cost-effective. In addition, it will also provide stability to enzyme and increase its catalytic activity. Objective: The main aim of the present study is to immobilize cellulase enzyme on Magnetic Nanoparticles (MNPs) in order to enable the enzyme to be re-used for clean sugar production from cellulose. Methods: MNPs were synthesized using chemical precipitation methods and characterized by different techniques. Further, cellulase enzyme was immobilized on MNPs and efficacy of free and immobilized cellulase for hydrolysis of cellulose was evaluated. Results: Enzymatic hydrolysis of cellulose by immobilized enzyme showed enhanced catalytic activity after 48 hours compared to free enzyme. In first cycle of hydrolysis, immobilized enzyme hydrolyzed the cellulose and produced 19.5 ± 0.15 gm/L of glucose after 48 hours. On the contrary, free enzyme produced only 13.7 ± 0.25 gm/L of glucose in 48 hours. Immobilized enzyme maintained its stability and produced 6.15 ± 0.15 and 3.03 ± 0.25 gm/L of glucose in second and third cycle, respectively after 48 hours. Conclusion: This study will be very useful for sugar production because of enzyme binding efficiency and admirable reusability of immobilized enzyme, which leads to the significant increase in production of sugar from cellulosic materials.

TiO2 nanoparticles coated with deep eutectic solvents: characterization and effect on photodegradation of organic dyes

2019 ◽  
Vol 43 (3) ◽  
pp. 1415-1423 ◽  
Author(s):  
Bruna L. Kuhn ◽  
Guilherme C. Paveglio ◽  
Siara Silvestri ◽  
Edson I. Muller ◽  
Michele S. P. Enders ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Tio2 Nanoparticles ◽  
Organic Dyes ◽  
Deep Eutectic Solvents

Deep eutectic solvents (DES) have been used to modulate the catalytic activity of TiO2 nanoparticles.

Palladium-Schiff-base-silica framework as a robust and recyclable catalyst for Suzuki–Miyaura cross-coupling in aqueous media

RSC Advances ◽  
2015 ◽  
Vol 5 (48) ◽  
pp. 38085-38092 ◽  
Author(s):  
Tahshina Begum ◽  
Manoj Mondal ◽  
Pradip K. Gogoi ◽  
Utpal Bora
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Room Temperature ◽  
Aqueous Media ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Recyclable Catalyst ◽  
Cross Coupling Reaction

A novel Pd@imine-SiO2 catalyst was prepared and found to exhibit excellent catalytic activity in a Suzuki-Miyaura cross-coupling reaction under aqueous media at room temperature.

scholarly journals Recent Progress of Cu-Catalyzed Azide-Alkyne Cycloaddition Reactions (CuAAC) in Sustainable Solvents: Glycerol, Deep Eutectic Solvents, and Aqueous Media

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2015 ◽  
Author(s):  
Noel Nebra ◽  
Joaquín García-Álvarez
Keyword(s):  
Recent Progress ◽  
Copper Catalyst ◽  
Aqueous Media ◽  
Deep Eutectic Solvents ◽  
Dipolar Cycloaddition ◽  
Green Solvents ◽  
Sustainable Solvents ◽  
Volatile Organic ◽  
Water Glycerol ◽  
Reaction Media

This mini-review presents a general overview of the progress achieved during the last decade on the amalgamation of CuAAC processes (copper-catalyzed azide-alkyne cycloaddition) with the employment of sustainable solvents as reaction media. In most of the presented examples, the use of water, glycerol (Gly), or deep eutectic solvents (DESs) as non-conventional reaction media allowed not only to recycle the catalytic system (thus reducing the amount of the copper catalyst needed per mole of substrate), but also to achieve higher conversions and selectivities when compared with the reaction promoted in hazardous and volatile organic solvents (VOCs). Moreover, the use of the aforementioned green solvents also permits the improvement of the overall sustainability of the Cu-catalyzed 1,3-dipolar cycloaddition process, thus fulfilling several important principles of green chemistry.

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