Chloroperoxidase-catalyzed enantioselective oxidation of methyl phenyl sulfide with dihydroxyfumaric acid/oxygen or ascorbic acid/oxygen as oxidants

Pasta, Piero; Carrea, Giacomo; Monzani, Enrico; Gaggero, Nicoletta; Colonna, Stefano

doi:10.1002/(sici)1097-0290(19990220)62:4<489::aid-bit13>3.0.co;2-7

Cited by 32 publications

(11 citation statements)

References 20 publications

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“…Two modes of operation exist: external loop membranes and submerged membranes. (Nakajima et al, 1992;Korus and Olson, 1977;Sannier et al, 1994;Pasta et al, 1999;Bouhallab and Touzé, 1995) and submerged membranes (Prata-Vidal et al, 2001;Cauwenberg et al, 1999;Greiner et al, 2003;Isono et al, 1996). In both modes of operation, the reactor volume is kept constant by adding fresh feed (cellulase enzyme and biomass suspended in buffer) at the same rate at which permeate is removed.…”

Section: Fig 1 -Schematic Representation Of a Future Lignocellulosicmentioning

confidence: 99%

Investigation of a submerged membrane reactor for continuous biomass hydrolysis

Malmali

Stickel

Wickramasinghe

2015

Food and Bioproducts Processing

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Cellulose Microfiltration Ultrafiltration Product inhibition a b s t r a c t Enzymatic hydrolysis of cellulose is one of the most costly steps in the bioconversion of lignocellulosic biomass. Use of a submerged membrane reactor has been investigated for continuous enzymatic hydrolysis of cellulose thus allowing for greater use of the enzyme compared to a batch process. The submerged 0.65 m polyethersulfone microfiltration membrane avoids the need to pump a cellulose slurry through an external loop. Permeate containing glucose is withdrawn at pressures slightly below atmospheric pressure. The membrane rejects cellulose particles and cellulase enzyme bound to cellulose. Here proofof-concept experiments have been conducted using a modified, commercially available membrane filtration cell under low fluxes around 75 L/(m 2 h). The operating flux is determined by the rate of glucose production. Maximizing the rate of glucose production involves optimizing mixing, reactor holding time, and the time the feed is held in the reactor prior to commencement of membrane filtration and continuous operation. Maximizing glucose production rates will require operating at low glucose concentration in order to minimize the adverse effects of product inhibition. Consequently practical submerged membrane systems will require a combined sugar concentration step in order to concentrate the product sugar stream prior to fermentation. (S.R. Wickramasinghe).Membrane-based separation processes are attractive as they could lead to significant process intensification and hence reduced operating costs (Drioli et al., 2012).Here we focus on hydrolysis of lignocellulosic biomass followed by fermentation. Fig. 1 is a schematic representation of a future lignocellulosic biomass to biofuel biorefinery. The main processing steps are shown. The first step involves receiving and storage of the lignocellulosic biomass. The biomass is usually shredded into an appropriate particle size and then pumped as a slurry to the pretreatment reactor. A leading technology for pretreatment is the use of dilute sulfuric acid at elevated temperatures (Schell et al., 2003;Shekiro et al., 2014). Dilute sulfuric acid has been shown to effectively hydrolyze the hemicellulose component of the biomass to its monomeric http://dx.

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Section: Fig 1 -Schematic Representation Of a Future Lignocellulosicmentioning

confidence: 99%

Investigation of a submerged membrane reactor for continuous biomass hydrolysis

Malmali

Stickel

Wickramasinghe

2015

Food and Bioproducts Processing

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“…Peroxidase (donor: hydrogen peroxide oxidoreductase) is a widely distributed group of enzymes that oxidize a variety of substrates at the expense of hydrogen peroxide. Although the peroxidase‐catalyzed homopolymerizations of various phenols and aniline derivatives were investigated by several groups,10–14 relatively little information has been available about the copolymerization of phenol mixtures 15–18. However, to the best of our knowledge, no reports have appeared on peroxidase treatments on the synthetic polymer surface.…”

Section: Introductionmentioning

confidence: 99%

“…Although the peroxidase-catalyzed homopolymerizations of various phenols and aniline derivatives were investigated by several groups, 10 -14 relatively little information has been available about the copolymerization of phenol mixtures. [15][16][17][18] However, to the best of our knowledge, no reports have appeared on peroxidase treatments on the synthetic polymer surface. In this article, we were encouraged to investigate biotechnological techniques that exploit enzymatic catalysis.…”

Section: Introductionmentioning

confidence: 99%

Novel surface modification of high‐density polyethylene films by using enzymatic catalysis

Zhao

Guo

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:The surface of high-density polyethylene (HDPE) films was modified by an enzyme, soybean peroxidase (SBP). The enzymatic surface modification was performed using a peroxidase as catalyst and hydrogen peroxide as oxidizing agent. The chemical composition and morphology of HDPE surfaces were characterized by X-ray photoelectron spectroscopy, infrared spectroscopy, and scanning electron microscopy. Results showed that after enzymatic treatment, the O/C atomic ratio of HDPE surfaces increased, and new functional groups such as -COappeared. Moreover, the surface of treated HDPE films became rougher than untreated surfaces. The hydrophilicity of treated and untreated HDPE films was analyzed by UV-vis spectroscopy and contact angle measurements. The decreased contact angle of the HDPE with water and increased adsorption ability of the surface to a water-soluble dye clearly indicated that enzymatic treatment can significantly increase the hydrophilicity of the surfaces of HDPE films. The catalytic mechanism of SBP was also discussed. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: [3673][3674][3675][3676][3677][3678] 2004

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“…Significantly, the epoxidation and sulfoxidation reactions catalyzed by CPO are highly enantioselective [41,42,43,44,45,46,47], which suggests a potential application in pharmaceutical industry. …”

Section: Chemical Reactions Catalyzed By Cpomentioning

confidence: 98%

Nuclear Magnetic Resonance Spectroscopic and Computational Investigations of Chloroperoxidase Catalyzed Regio- and Enantio-Selective Transformations

Zhang¹

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Chloroperoxidase-catalyzed enantioselective oxidation of methyl phenyl sulfide with dihydroxyfumaric acid/oxygen or ascorbic acid/oxygen as oxidants

Cited by 32 publications

References 20 publications

Investigation of a submerged membrane reactor for continuous biomass hydrolysis

Investigation of a submerged membrane reactor for continuous biomass hydrolysis

Novel surface modification of high‐density polyethylene films by using enzymatic catalysis

Nuclear Magnetic Resonance Spectroscopic and Computational Investigations of Chloroperoxidase Catalyzed Regio- and Enantio-Selective Transformations

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