Biocatalytic Membrane Reactor: Mass Transport and Applications

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Biocatalysis".

Deadline for manuscript submissions: closed (15 September 2020) | Viewed by 4615

Special Issue Editor


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Guest Editor
Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Veszprém, Hungary
Interests: Mass transfer and separation by membrane processes (1971–); Separation of optically active components by membrane processes (2000–2011); Controlled drug release (2002–2008); Biomass utilization, bioethanol, biochemicals production (2005–); Investigation of enzyme nanoparticles (2005–); Biocatalytic membrane reactor (2010–); Energy production by PRO membrane process (2013–)
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Dear Colleagues,

The biocatalytic membrane reactor (BMR) technology is advancing rapidly around the world both in research and commercial applications. Integrating the properties of membranes with biological catalysts such as cells or enzymes forms the basis of an important new technology. Membrane layers are especially useful for immobilizing whole cells (bacteria, yeast, mammalian and plant cells) or bioactive molecules such as enzymes to produce a wide variety of chemicals and substances. Various membrane materials, hydrophobic, hydrophilic or organic and inorganic, can be used as bioreactors, while membrane layers can be either flat sheets or of a fibrous form. The main advantages of the hollow-fiber bioreactor are the large specific surface area (internal and external surface of the membrane) for cell adhesion or enzyme immobilization; the ability to grow cells to high density; the possibility for simultaneous reaction and separation; and a relatively short diffusion path in the membrane layer. Depending on the solubility of the substrate(s) and reaction product(s), the bioreactor can be monophasic or biphasic regarding the flowing fluid phases. When the substrate is a hydrophobic compound, the biphasic system is often applied for the bioreaction, especially when the product is soluble in aqueous phase. A noteworthy monophasic reaction is oxidation/reduction reactions using, e.g., peroxidase, glucose oxidase, laccase, or removal of toxic chemicals from the environment, which are taking place in aqueous phase. 

BMRs can be applied for the production of foods, biofuels, plant metabolites, amino acids, antibiotics, anti-inflammatories, anticancer drugs, vitamins, proteins, optically pure enantiomers, isomers, fine chemicals, as well as for the treatment of wastewater, e.g., industrial, domestic, and municipal ones. Important applications of enzyme membrane reactors include hydrolysis of macromolecules, biotransformation of lipids, reactions with cofactors, synthesis of peptides, and optical resolution of amino acids. Other widespread applications of the BMR are in food processing, the brewing industry, fruit juices, the dairy industry, the paper industry, the biofuel industry, biological detergent, the rubber industry, the photographic industry, the starch industry, and molecular biology.

For the prediction of the reactor’s performance, the description of the transport process through the biocatalytic membrane layer is crucially important. It is not only the diffusion but also the convective flow, when the substrate is forced to flow through the biocatalytic membrane, that affects strongly the process performance. One of the interesting advantages of this operating mode is that the diffusion flow, plus mostly more intensive, convection flow, makes the reaction more effective.

Prof. Endre Nagy
Guest Editor

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Keywords

  • Biocatalysis
  • Biocatalytic membrane reactor
  • Mass transport
  • Bioreactions
  • Membrane structure
  • Enzyme bioreactor
  • Cell membrane reactor
  • Membrane bioprocess applications

Published Papers (2 papers)

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Research

19 pages, 2813 KiB  
Article
Study of Prepared α-Chymotrypsin as Enzyme Nanoparticles and of Biocatalytic Membrane Reactor
by Imre Hegedüs, Marta Vitai, Miklós Jakab and Endre Nagy
Catalysts 2020, 10(12), 1454; https://doi.org/10.3390/catal10121454 - 11 Dec 2020
Cited by 5 | Viewed by 2560
Abstract
Biocatalytic kinetic effect of α-chymotrypsin enzyme has been investigated in its free and pretreated forms (it was covered by a very thin, porous polymer layer, called enzyme nanoparticle) as well as its immobilized form into pores of polysulfone/polyamide asymmetric, hydrophilic membrane. Trimethoxysilyl [...] Read more.
Biocatalytic kinetic effect of α-chymotrypsin enzyme has been investigated in its free and pretreated forms (it was covered by a very thin, porous polymer layer, called enzyme nanoparticle) as well as its immobilized form into pores of polysulfone/polyamide asymmetric, hydrophilic membrane. Trimethoxysilyl and acrylamide-bisacrylamide polymers have been used for synthesis of enzyme nanoparticles. Applying Michaelis-Menten kinetics, the KM and vmax values of enzyme-polyacrylamide nanoparticles are about the same, as that of free enzyme. On the other hand, enzyme nanoparticles retain their activity 20–80 fold longer time period than that of the free enzyme, but their initial activity values are reduced to 13–55% of those of free enzymes, at 37 °C. Enzyme immobilized into asymmetric porous membrane layer remained active about 2.3-fold longer time period than that of native enzyme (at pH = 7.4 and at 23 °C), while its reaction rate was about 8-fold higher than that of free enzyme, measured in mixed tank reactor. The conversion degree of substrate was gradually decreased in presence of increasing convective flux of the inlet fluid phase. Biocatalytic membrane reactor has transformed 2.5 times more amount of substrate than the same amount of enzyme nanoparticles and 19 times more amount of substrate than free enzyme, measured in mixed tank reactor. Full article
(This article belongs to the Special Issue Biocatalytic Membrane Reactor: Mass Transport and Applications)
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25 pages, 3991 KiB  
Article
Diffusive Plus Convective Mass Transport, Accompanied by Biochemical Reaction, Across Capillary Membrane
by Endre Nagy and Imre Hegedüs
Catalysts 2020, 10(10), 1115; https://doi.org/10.3390/catal10101115 - 25 Sep 2020
Cited by 2 | Viewed by 1619
Abstract
This study theoretically analyzes the mass transport through capillary, asymmetric, biocatalytic membrane reactor, where the diffusive plus convective mass transport is accompanied by biochemical reaction with Michaelis-Menten kinetics. An approach mathematical model was developed that provides the mass transfer properties in closed, explicit [...] Read more.
This study theoretically analyzes the mass transport through capillary, asymmetric, biocatalytic membrane reactor, where the diffusive plus convective mass transport is accompanied by biochemical reaction with Michaelis-Menten kinetics. An approach mathematical model was developed that provides the mass transfer properties in closed, explicit mathematical forms. The inlet and outlet mass transfer rates can then put into the differential mass transport expressions of the lumen and the shell fluid phases as boundary values. The approach solution was obtained by dividing the membrane layer into very thin sub-layers with constant transport and reaction kinetic parameters and the obtained second-order differential equation with constant parameters, given for every sublayer, could be solved analytically. Two operating modes are analyzed in this paper, namely, with and without a sweeping phase on the permeating side. These models deviate by the boundary conditions, only, defined them for the outlet membrane surface. The main purpose of this study is to show how the cylindrical space affects the transport process, concentration distribution, mass transfer rates and conversion in presence of a biochemical reaction. It is shown that the capillary transport can significantly be affected by the lumen radius, by the biocatalytic reactor thickness and the convective flow. Decreasing values of the lumen radius reduce the effect of the biochemical/chemical reaction; the increasing reactor thickness also decreases the physical mass transfer rate and, with it, increases the effect of reaction rate. The model can also be applied to reactions with more general kinetic equations with variable parameters. Full article
(This article belongs to the Special Issue Biocatalytic Membrane Reactor: Mass Transport and Applications)
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