Bibliografías temáticas / Biocatalytic component

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Literatura académica sobre el tema "Biocatalytic component"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 19 de febrero de 2023

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Artículos de revistas sobre el tema "Biocatalytic component"

Ion, Sabina, Florentina Olănescu, Florina Teodorescu, Robert Tincu, Daniela Gheorghe, Vasile I. Pârvulescu y Mădălina Tudorache. "DES-Based Biocatalysis as a Green Alternative for the l-menthyl Ester Production Based on l-menthol Acylation". Molecules 27, n.º 16 (18 de agosto de 2022): 5273. http://dx.doi.org/10.3390/molecules27165273.

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The deep eutectic solvent (DES)-based biocatalysis of l-menthol acylation was designed for the production of fatty acid l-menthyl ester (FME) using fatty acid methyl ester (FAME). The biocatalytic reaction was assisted by a lipase enzyme in the DES reaction medium. ւՒ-menthol and fatty acids (e.g., CA—caprylic acid; OA—oleic acid; LiA—linoleic acid; and LnA—linolenic acid) were combined in the binary mixture of DES. In this way, the DES provided a nonpolar environment for requested homogeneity of a biocatalytic system with reduced impact on the environment. The screening of lipase enzyme demonstrated better performance of immobilized lipase compared with powdered lipase. The performance of the biocatalytic system was evaluated for different DES compositions (type and concentration of the acid component). l-menthol:CA = 73:27 molar ratio allowed it to reach a maximum conversion of 95% methyl lauric ester (MLE) using a NV (Candida antarctica lipase B immobilized on acrylic resin) lipase biocatalyst. The recyclability of biocatalysts under optimum conditions of the system was also evaluated (more than 80% recovered biocatalytic activity was achieved for the tested biocatalysts after five reaction cycles). DES mixtures were characterized based on differential scanning calorimetry (DSC) and refractive index analysis.

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Alotaibi, Mohammed, Jinesh C. Manayil, Gillian M. Greenway, Stephen J. Haswell, Stephen M. Kelly, Adam F. Lee, Karen Wilson y Georgios Kyriakou. "Lipase immobilised on silica monoliths as continuous-flow microreactors for triglyceride transesterification". Reaction Chemistry & Engineering 3, n.º 1 (2018): 68–74. http://dx.doi.org/10.1039/c7re00162b.

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He, Wei-Xun, Xiu Xing, Zeng-Jie Yang, Yuan Yu, Na Wang y Xiao-Qi Yu. "Biocatalytic One-Pot Three-Component Synthesis of Indoloquinolizines with High Diastereoselectivity". Catalysis Letters 149, n.º 2 (21 de enero de 2019): 638–43. http://dx.doi.org/10.1007/s10562-019-02660-7.

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Zhou, Hangyu, Jing Zhao, Aitao Li y Manfred T. Reetz. "Chemical and Biocatalytic Routes to Arbutin †". Molecules 24, n.º 18 (11 de septiembre de 2019): 3303. http://dx.doi.org/10.3390/molecules24183303.

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Arbutin (also called β-arbutin) is a natural product occurring in the leaves of a variety of different plants, the bearberries of the Ericaceae and Saxifragaceae families being prominent examples. It is a β-glucoside derived from hydroquinone (HQ; 1,4-dihydroxybenzene). Arbutin has been identified in traditional Chinese folk medicines as having, inter alia, anti-microbial, anti-oxidant, and anti-inflammatory properties that useful in the treatment of different ailments including urinary diseases. Today, it is also used worldwide for the treatment of skin ailments by way of depigmenting, which means that arbutin is a component of many products in the cosmetics and healthcare industries. It is also relevant in the food industry. Hundreds of publications have appeared describing the isolation, structure determination, toxicology, synthesis, and biological properties of arbutin as well as the molecular mechanism of melanogenesis (tyrosinase inhibition). This review covers the most important aspects with special emphasis on the chemical and biocatalytic methods for the production of arbutin.

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Lv, Y. M., P. Laborda, K. Huang, Z. P. Cai, M. Wang, A. M. Lu, C. Doherty, L. Liu, S. L. Flitsch y J. Voglmeir. "Highly efficient and selective biocatalytic production of glucosamine from chitin". Green Chemistry 19, n.º 2 (2017): 527–35. http://dx.doi.org/10.1039/c6gc02910h.

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Heine, Thomas, Willem van Berkel, George Gassner, Karl-Heinz van Pée y Dirk Tischler. "Two-Component FAD-Dependent Monooxygenases: Current Knowledge and Biotechnological Opportunities". Biology 7, n.º 3 (2 de agosto de 2018): 42. http://dx.doi.org/10.3390/biology7030042.

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Flavoprotein monooxygenases create valuable compounds that are of high interest for the chemical, pharmaceutical, and agrochemical industries, among others. Monooxygenases that use flavin as cofactor are either single- or two-component systems. Here we summarize the current knowledge about two-component flavin adenine dinucleotide (FAD)-dependent monooxygenases and describe their biotechnological relevance. Two-component FAD-dependent monooxygenases catalyze hydroxylation, epoxidation, and halogenation reactions and are physiologically involved in amino acid metabolism, mineralization of aromatic compounds, and biosynthesis of secondary metabolites. The monooxygenase component of these enzymes is strictly dependent on reduced FAD, which is supplied by the reductase component. More and more representatives of two-component FAD-dependent monooxygenases have been discovered and characterized in recent years, which has resulted in the identification of novel physiological roles, functional properties, and a variety of biocatalytic opportunities.

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Chhaya, Urvish y Snehal Ingale. "Micellar Enzymology- Chemistry and Applications". Open Biotechnology Journal 10, n.º 1 (11 de noviembre de 2016): 326–34. http://dx.doi.org/10.2174/1874070701610010326.

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Enzymes in aqueous environment usually deal with purified enzyme preparations isolated from living matter which does not mimic real catalytic properties in vivo. Interaction of enzymes in nature takes place with different surfaces composed from lipid membranes or they get incorporated into biomembranes. Although Water is not a dominating component in the cytoplasm but plays a structural role by participating in the formation of biocatalytic complexes like glycoproteins. Water is needed to keep biocatalyst in active confirmation and hence plays very crucial role in biocatalytic reactions, activity and stability so that it can be used for various applications. This review focuses on composition, preparation properties and parameters which influence enzymes in reverse micelles and application of micellar enzymology to study protein chemistry, shifting equilibrium of various reactions, to recover various products by partition chromatography and bioremediation of chlorophenolic environmental pollutants.

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Shrivas, Prabhakar y Umesh Pratap. "Biocatalytic one-pot three-component synthesis of 4H-chromene derivatives in non-aqueous medium". Chemical Papers 73, n.º 5 (10 de enero de 2019): 1301–7. http://dx.doi.org/10.1007/s11696-018-00679-5.

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Zumbrägel, Nadine y Harald Gröger. "Merging Heterocyclic Chemistry and Biocatalysis in One-Pot Processes through Compartmentalization of the Reaction Steps". Bioengineering 5, n.º 3 (1 de agosto de 2018): 60. http://dx.doi.org/10.3390/bioengineering5030060.

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A proof of concept for a one-pot process merging a heterocycle formation by a classical chemical approach at basic conditions with a biocatalytic reduction, running at neutral pH conditions, is reported. A crucial component for this process is the compartmentalization of the single reactions by the use of polydimethylsiloxane thimbles. This process was applied successfully towards an asymmetric synthesis of (S)-2,2,3-trimethyl-1-thia-4-azaspiro[4.4]nonane, leading to excellent enantioselectivities of 99% enantiomeric excess (ee).

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Hu, Ke Shun, Chong Le Chen, Huan Ru Ding, Tian Yu Wang, Qin Zhu, Yi Chen Zhou, Jia Min Chen et al. "Production of Salvianic Acid A from l-DOPA via Biocatalytic Cascade Reactions". Molecules 27, n.º 18 (18 de septiembre de 2022): 6088. http://dx.doi.org/10.3390/molecules27186088.

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Salvianic acid A (SAA), as the main bioactive component of the traditional Chinese herb Salvia miltiorrhiza, has important application value in the treatment of cardiovascular diseases. In this study, a two-step bioprocess for the preparation of SAA from l-DOPA was developed. In the first step, l-DOPA was transformed to 3,4-dihydroxyphenylalanine (DHPPA) using engineered Escherichia coli cells expressing membrane-bound L-amino acid deaminase from Proteus vulgaris. After that, the unpurified DHPPA was directly converted into SAA by permeabilized recombinant E. coli cells co-expressing d-lactate dehydrogenase from Pediococcus acidilactici and formate dehydrogenase from Mycobacterium vaccae N10. Under optimized conditions, 48.3 mM of SAA could be prepared from 50 mM of l-DOPA, with a yield of 96.6%. Therefore, the bioprocess developed here was not only environmentally friendly, but also exhibited excellent production efficiency and, thus, is promising for industrial SAA production.

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Tesis sobre el tema "Biocatalytic component"

Morris, Kristy y n/a. "Optimisation of the Biocatalytic Component in a Ferricyanide Mediated Approach to Rapid Biochemical Oxygen Demand Analysis". Griffith University. School of Environmental and Applied Science, 2005. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20060906.121244.

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A novel rapid method for the determination of biochemical oxygen demand (BOD) has been developed. By replacing oxygen, the terminal electron acceptor in the microbial oxidation of organic substrate, with the ferricyanide ion, a significant increase in the rate of the biochemical reaction could be achieved. This arises from the high solubility of the ferricyanide ion (compared to oxygen); therefore allowing for elevated microbial populations without rapid depletion of the electron acceptor. Therefore, the BOD of a sample can be determined within 1-3 hours compared to 5-days with the standard BOD5 assay. A range of microorganisms were shown to be able to use the ferricyanide ion as an alternative electron acceptor for the biodegradation of a range of organic compounds in the ferricyanide mediated BOD (FM-BOD) assay. The most suitable biocatalyst in the FM-BOD method, however, was shown to be a mixture of microorganisms that was capable of degrading large amounts and types of compounds. These mixed consortia of microorganisms included a synthetic mixture prepared in our laboratory and two commercially available consortia, BODseedTM and Bi-ChemTM. When these seed materials were employed in the FM-BOD assay, the method was shown to closely estimate the BOD5 values of real wastewater samples. The linear dynamic working range of the FM-BOD method was also greatly extended compared to the standard BOD5 assay (nearly 50 times greater) and other oxygen based BOD biosensors. The immobilisation of the microbial consortia by both gel entrapment and freeze-drying methods was shown to greatly reduce the preparation and handling time of the mixed consortia for use in the FM-BOD method. Immobilisation of the mixed microbial consortium in LentiKats®, a PVA hydrogel, resulted in a marked increase in the stability of the biocatalyst. Diffusion limitations resulting from the gel matrix, however, reduced the rate and extent of the bioreaction as well as the linear dynamic working range of the method. Freeze-drying techniques were shown to circumvent some of the limitations identified with gel entrapment for the immobilisation of the mixed consortia. The freeze-dried consortia could be used off-the-shelf and demonstrated reduced diffusional restrictions. A marked decrease in the viability of the microorganisms was observed directly following the freeze-drying process and in subsequent storage. Carrageenan, however, was shown to afford a significant degree a protection to the cells during the freeze-drying process.

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Odnell, Anna. "Influencing anaerobic digestion early stage processes for increased biomethane production from different substrate components". Licentiate thesis, Linköpings universitet, Kemi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-147721.

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Finding alternatives to petroleum-based energy sources is of interest since it could reduce the emissions of net carbon dioxide to the atmosphere by increasing the usage of renewable energy sources. To do so improvements are needed in the renewable energy production sector. Biogas production is of interest since the anaerobic digestion process can degrade many different biomolecules and is, contrary to e.g. bioethanol and biodiesel, not dependent on specific molecules. Thus, many wastes such as slaughterhouse waste, sludge from waste water treatment and lignocellulose residual material etc. can be used as substrates for biogas production. However, there are limitations in the degradation process depending on the composition of the selected substrate. To overcome these limitations such as inhibition of different microorganisms, or recalcitrant substrate, different methods can be used to increase the biogas production. In this study different substrates were selected and analyzed/treated for remedies of early stage rate limiting problems of the anaerobic digestion process. Different analyzes and techniques were selected depending on the limitations correlated to the main problematic component of the specific substrate. Improvements could be reached for the degradation of slaughterhouse waste by augmentation with the clay mineral zeolite. Addition of different enzymes to the substrate environment of different waste water treatment plant sludges resulted in limited life time of the selected enzymes. However, certain enzymes proved to be promising candidates with an effect of increased biogas production rate and yield for the time that the enzyme remained active. In an additional experiment, cellulolytic enzymes, naturally produced by a biogas producing microbial community, were induced, collected and added to a biogas experiment of ensiled forage ley, by which it was shown that these cellulases led to an increase in biogas production rate and yield. Thus, the studies demonstrate different techniques for improving the anaerobic digestion process of different types of substrates.

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Abul-Haija, Y. M., S. Roy, P. W. J. M. Frederix, Nadeem Javid, V. Jayawarna y R. V. Ulijn. "Biocatalytically Triggered Co‐Assembly of Two‐Component Core/Shell Nanofibers". 2013. http://hdl.handle.net/10454/17082.

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For the development of applications and novel uses for peptide nanostructures, robust routes for their surface functionalization, that ideally do not interfere with their self‐assembly properties, are required. Many existing methods rely on covalent functionalization, where building blocks are appended with functional groups, either pre‐ or post‐assembly. A facile supramolecular approach is demonstrated for the formation of functionalized nanofibers by combining the advantages of biocatalytic self‐assembly and surfactant/gelator co‐assembly. This is achieved by enzymatically triggered reconfiguration of free flowing micellar aggregates of pre‐gelators and functional surfactants to form nanofibers that incorporate and display the surfactants’ functionality at the surface. Furthermore, by varying enzyme concentration, the gel stiffness and supramolecular organization of building blocks can be varied.
FP7 Marie Curie Actions of the European Commission. Grant Number: 289723; EPSRC; HFSP; ERC; Leverhulme Trust

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Rousseau, Olivier. "Accélération de l'exploration de l'espace chimique du cytochrome P450 BM3 par des méthodes de criblage à haut débit et bio-informatiques". Thèse, 2018. http://hdl.handle.net/1866/21949.

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Capítulos de libros sobre el tema "Biocatalytic component"

Efremenko, Elena, Il'ya Lyagin, Valentin Gorelenkov, Vasiliy Zavialov, Nataliya Zavialova y George Frolov. "Self-defending (self-degasing) materials for protection against organophosphorus compounds". En ORGANOPHOSPHORUS NEUROTOXINS, 321–39. ru: Publishing Center RIOR, 2020. http://dx.doi.org/10.29039/51_321-339.

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The paper presents an analysis of theoretical and experimental studies of national and foreign scientists developing “self-cleaning” (self-degassing) materials for personal protection, providing increased survival of people under the influence of warfare organophosphorus compounds. The use of enzymes as components of modern protective materials obtained using nano- and chemical-biological biocatalytic technologies is summarized.

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G. Montalbán, Mercedes y Gloria Víllora. "Supercritical Fluids: Properties and Applications". En Phase Equilibria With Supercritical Carbon Dioxide - Application to the Components of a Biocatalytic Process. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105485.

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Currently, both humanity and the whole planet are living in a critical time, which leads us to look for more sustainable formulas to interact with the environment. One of the important changes in the design and operation of chemical processes is the search for environmentally friendly technologies. Many industrial processes are carried out under severe conditions or with reactants that involve the use of strong acids, toxic metal catalysts, organic solvents, and processes at high temperatures and/or pressures. Supercritical fluids (SCFs) and, among these, supercritical carbon dioxide (scCO2), have been revealed as promising environmentally friendly solvents, energy-efficient, selective, and capable of reducing waste, constituting an alternative to conventional organic solvents. The use of SCF, such as solvents and reaction media, makes it possible to work in less severe and more environmentally friendly conditions, even considerably increasing the efficiency of the processes. This chapter provides a brief review of the most important properties of SCF, with special emphasis on scCO2, as well as some of the most important applications.

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G. Montalbán, Mercedes y Gloria Víllora. "High-Pressure Fluid Phase Equilibria". En Phase Equilibria With Supercritical Carbon Dioxide - Application to the Components of a Biocatalytic Process. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105486.

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One of the crucial aspects in the design of processes of this millennium is the use of environmentally benign technologies. The introduction of supercritical fluids (SCF) and, in addition, their use with other solvents, such as ionic liquids, further diversify the applications of these fluids. SCF are powerful solvents with many unique properties. They have the mobility of gases and the dissolving power of liquid solvents, resulting in efficient high mass transfer rates and penetration into porous matrices. However, reliable and versatile mathematical models of phase equilibrium thermodynamics are needed for use in process design and viability studies. This chapter reviews experimental procedures for obtaining high-pressure phase equilibria data. In addition, phase diagrams describing binary mixtures and thermodynamic models capable of determining the conditions at phase equilibria at high pressures are considered.

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G. Montalbán, Mercedes y Gloria Víllora. "Application of Supercritical Phase Equilibria to the Components of the Transesterification Reaction of rac-2-Pentanol with a Vinyl Ester". En Phase Equilibria With Supercritical Carbon Dioxide - Application to the Components of a Biocatalytic Process. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105487.

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This chapter illustrates the collection of phase equilibrium and high-pressure solubility data applied to four binary systems, (CO2 + 2-pentanol, CO2 + vinyl butyrate, CO2 + 2-pentyl butyrate and CO2 + butyric acid) at three temperatures of (313.15, 323.15, and 333.15) K and pressures up to 11 MPa. These four organic compounds were selected because they are implicated in the kinetic resolution of rac-2-pentanol, and their phase equilibria play an important role in the separation processes of the reaction compounds. Equilibrium data were obtained using a synthetic method in a high-pressure cell of variable volume. All systems were found to have type I phase behavior. Experimental high-pressure data showed a good correlation with density-based models and by the well-known Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK) EoS coupled with the quadratic mixing rule in a semipredictive approach to describe the phase equilibrium topology of the four binary mixtures.

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Quong, D., I. K. O'Neill, D. Poncelet y R. J. Neufeld. "Gastrointestinal protection of cellular component DNA within an artificial cell system for environmental carcinogen biomonitoring". En Immobilized Cells - Basics and Applications, Proceedings of an International Symposium organized under auspices of The Working Party on Applied Biocatalysis of the European Federation of Biotechnology Noordwijkerhout, 814–20. Elsevier, 1996. http://dx.doi.org/10.1016/s0921-0423(96)80111-0.

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Rodney, Rebecca L. y Alan J. Russell. "Enzyme Chemistry in Carbon Dioxide". En Green Chemistry Using Liquid and Supercritical Carbon Dioxide. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780195154832.003.0010.

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Enzymes are biocatalysts constructed of a folded chain of amino acids. They may be used under mild conditions for specific and selective reactions. While many enzymes have been found to be catalytically active in both aqueous and organic solutions, it was not until quite recently that enzymes were used to catalyze reactions in carbon dioxide when Randolph et al. (1985) performed the enzyme-catalyzed hydrolysis of disodium p-nitrophenol using alkaline phosphatase and Hammond et al. (1985) used polyphenol oxidase to catalyze the oxidation of p-cresol and p-chlorophenol. Since that time, more than 80 papers have been published concerning reactions in this medium. Enzymes can be 10–15 times more active in carbon dioxide than in organic solvents (Mori and Okahata, 1998). Reactions include hydrolysis, esterification, transesterification, and oxidation. Reactor configurations for these reactions were batch, semibatch, and continuous. There are many factors that influence the outcome of enzymatic reactions in carbon dioxide. These include enzyme activity, enzyme stability, temperature, pH, pressure, diffusional limitations of a two-phase heterogeneous mixture, solubility of enzyme and/or substrates, water content of the reaction system, and flow rate of carbon dioxide (continuous and semibatch reactions). It is important to understand the aspects that control and limit biocatalysis in carbon dioxide if one wants to improve upon the process. This chapter serves as a brief introduction to enzyme chemistry in carbon dioxide. The advantages and disadvantages of running reactions in this medium, as well as the factors that influence reactions, are all presented. Many of the reactions studied in this area are summarized in a manner that is easy to read and referenced in Table 6.1. Carbon dioxide is cited as a good choice of solvents for a number of reasons. Some of the advantages of running reactions in carbon dioxide instead of the more traditional organic solvents include the low viscosity of the solvent, the convenient recovery of the products and non-reacted components, abundant availability, low cost, no solvent contamination of products, full miscibility with other gases, non-existent toxicity, low surface tension, non-flammability, and recyclability. The low mass-transfer limitations are an advantage because of the large diffusivity of reactants.

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Actas de conferencias sobre el tema "Biocatalytic component"

Sanghvi, Yogesh S., Susana Fernández, Vicente Gotor y Miguel Ferrero. "Biocatalysis: green processes for the preparation of protected nucleosides". En XVIth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2014. http://dx.doi.org/10.1135/css201414361.

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