Publicaciones (2022)
Publicaciones clasificadas por fecha descendente
Recent advances in continuous reduction of furfural to added value chemicals
Autores: Richel, A; Maireles-Torres, P; Len, C
Article.
Curr. Opin. Green Sustain. Chem.. vol: 37. page: 2452-2236.
Fecha: OCT. 2022.
Doi: 10.1016/j.cogsc.2022.100655.
Resumen:
This report describes the recent advances in reduction of furfural to added-value chemicals under liquid phase and gas phase continuous flow systems using conventional activation and using electrochemical activation. The main biobased-chemicals obtained furfuryl alcohol, tetrahydrofurfuryl alcohol, 2-methylfuran and 2-methyltetrahydrofuran are highlighted..
Transformation of Methanol to Hydrocarbons (MTH): Comparison Between MeAPO-36 (Me = Zn, Co, Mg) and Modified ZSM-5 Catalysts
Autores: Ruiz, MG; Casados, DAS; Pliego, JA; Alvarez, CM; de Andres, ES
Artículo; Early Access.
Catal. Lett.. vol: . page: 1011-372X.
Fecha: . .
Doi: 10.1007/s10562-022-04181-2.
Resumen:
This paper presents a study of the use of zeolitic catalysts and modified zeotypes for the reaction of transformation of methanol to hydrocarbons (MTH). Materials of the aluminophosphate type MeAPO-36 where Me is Zn, Mg and Co were prepared, in addition to modifying an acidic commercial zeolite with zinc ions by ion exchange. The physicochemical properties of the zeotypes were studied using XRD (X-ray diffraction), N-2 adsorption-desorption, temperature programmed desorption of NH3 and SEM (Scanning Electron Microscopy). The catalytic [read more]
Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids
Autores: Hazarika, S; Borah, G
Article; Early Access.
Appl. Organomet. Chem.. vol: . page: 0268-2605.
Fecha: . .
Doi: 10.1002/aoc.6864.
Resumen:
The silica-supported cobalt ferrite spinel nanocatalyst has been successfully synthesized by the coprecipitation method and extensively characterized by FTIR, XRD, SEM-EDX, TEM, BET, VSM, XPS, TGA, and ICP-AES analysis. The bands observed at 3435 cm(-1) (nu (OH) of Si-OH) and 1637 cm(-1) (gamma (OH) of Si-OH) in the FTIR spectrum of the as-synthesized nanocatalyst unambiguously tell the presence of silica support. Moreover, a very weak intensity and a medium intensity peak at 683 cm(-1) and 463 cm(-1) suggested intrinsic stretching vibrations of Fe-O and Co-O [read more]
Chemometrics for Raman Spectroscopy Harmonization
Autores: Barton, B; Thomson, J; Diz, EL; Portela, R
Review; Early Access.
Appl. Spectrosc.. vol: . page: 0003-7028.
Fecha: . .
Doi: 10.1177/00037028221094070.
Resumen:
Raman spectroscopy is used in a wide variety of fields, and in a plethora of different configurations. Raman spectra of simple analytes can often be analyzed using univariate approaches and interpreted in a straightforward manner. For more complex spetral data such as time series or line profiles (1D), Raman maps (2D), or even volumes (3D), multivariate data analysis (MVDA) becomes a requirement. Even though there are some existing standards for creation, implementation, and validation of methods and models employed in industry and [read more]
A Plurizyme with Transaminase and Hydrolase Activity Catalyzes Cascade Reactions
Autores: Roda, S; Fernandez-Lopez, L; Benedens, M; Bollinger, A; Thies, S; Schumacher, J; Coscolin, C; Kazemi, M; Santiago, G; Gertzen, CGW; Gonzalez-Alfonso, JL; Plou, FJ; Jaeger, KE; Smits, SHJ; Ferrer, M; Guallar, V
Artículo.
Angew. Chem.-Int. Edit.. vol: 61. page: 1433-7851.
Fecha: sep-12. 2022.
Doi: 10.1002/anie.202207344.
Resumen:
Engineering dual-function single polypeptide catalysts with two abiotic or biotic catalytic entities (or combinations of both) supporting cascade reactions is becoming an important area of enzyme engineering and catalysis. Herein we present the development of a PluriZyme, TR2E2, with efficient native transaminase (k(cat): 69.49 +/- 1.77 min(-1)) and artificial esterase (k(cat): 3908-0.41 min(-1)) activities integrated into a single scaffold, [read more]
The Stability of Dimeric D-amino Acid Oxidase from Porcine Kidney Strongly Depends on the Buffer Nature and Concentration
Autores: Carballares, D; Rocha-Martin, J; Fernandez-Lafuente, R
Artículo.
Catalysts. vol: 12. page: .
Fecha: SEP. 2022.
Doi: 10.3390/catal12091009.
Resumen:
The first step of the inactivation of the enzyme D-amino acid oxidase (DAAO) from porcine kidney at pH 5 and 7 is the enzyme subunit dissociation, while FAD dissociation has not a relevant role. At pH 9, both dissociation phenomena affect the enzyme stability. A strong effect of the buffer nature and concentration on enzyme stability was found, mainly at pH 7 and 9 (it was possible at the same temperature to have the enzyme fully inactivated in 5 mM of Hepes while maintaining 100% in 5 [read more]
Lipase immobilization via cross-linked enzyme aggregates: Problems and prospects – A review
Autores: Sampaio, CS; Angelotti, JAF; Fernandez-Lafuente, R; Hirata, DB
Review.
Int. J. Biol. Macromol.. vol: 215. page: 0141-8130.
Fecha: AUG 31. 2022.
Doi: 10.1016/j.ijbiomac.2022.06.139.
Resumen:
In this review we have focused on the preparation of cross-linked enzyme aggregates (CLEAs) from lipases, as these are among the most used enzyme in bioprocesses. This immobilization method is considered very attractive due to preparation simplicity, non-use of supports and the possibility of using crude enzyme extracts. CLEAs provide lipase stabilization under extreme temperature or pH conditions or in the presence of organic solvents, in addition to preventing enzyme leaching in aqueous medium. However, it presents some problems in the [read more]
Shepherding reaction intermediates to optimize H-2 yield using composite-doped TiO2-based photocatalysts
Autores: Barba-Nieto, I; Colon, G; Fernandez-Garcia, M; Kubacka, A
Artículo.
Chem. Eng. J.. vol: 442. page: 1385-8947.
Fecha: AUG 15. 2022.
Doi: 10.1016/j.cej.2022.136333.
Resumen:
Optimization of Pt-promoted TiO2-based is key to promote the photocatalytic production of hydrogen using sacrificial alcohol molecules. Combination of doping and surface decoration of the mentioned base photoactive material is here exploited to maximize hydrogen yield. Using the quantum efficiency parameter, it is shown that the resulting composite system can boost activity up to 7.3 times within the whole methanol:water mixture ratio, yielding quantum efficiencies in the ca. 13-16 % range. The key role of the different components in generating charge carrier [read more]
Unraveling Membrane Perturbations Caused by the Bacterial Riboregulator Hfq
Autores: Turbant, F; Waeytens, J; Campidelli, C; Bombled, M; Martinez, D; Grelard, A; Habenstein, B; Raussens, V; Velez, M; Wien, F; Arluison, V
Artículo.
Int. J. Mol. Sci.. vol: 23. page: .
Fecha: AUG. 2022.
Doi: 10.3390/ijms23158739.
Resumen:
Hfq is a pleiotropic regulator that mediates several aspects of bacterial RNA metabolism. The protein notably regulates translation efficiency and RNA decay in Gram-negative bacteria, usually via its interaction with small regulatory RNAs. Previously, we showed that the Hfq C-terminal region forms an amyloid-like structure and that these fibrils interact with membranes. The immediate consequence of this interaction is a disruption of the membrane, but the effect on [read more]
Influence of nickel loading on the hydroisomerization of n-dodecane with nickel-tungsten oxide-alumina supported catalysts
Autores: Garcia-Perez, D; Lopez-Garcia, A; Renones, P; Alvarez-Galvan, MC; Campos-Martin, JM
Artículo.
Mol. Catal.. vol: 529. page: 2468-8231.
Fecha: AUG. 2022.
Doi: 10.1016/j.mcat.2022.112556.
Resumen:
Heterogeneous catalysts based on alumina-supported tungsten oxides (15 wt% W) with different loadings of nickel (0.5, 1, 2, 4, 6, 8 and 10 wt% Ni) were selected to study the influence of Ni loading on the hydroisomerization of n-dodecane. The catalysts were prepared by applying the wetness impregnation method on the supports to introduce W and Ni. The characterization techniques applied for determining physicochemical properties of the catalysts were N-2 adsorption-desorption at 77 K (textural properties), X-ray diffraction (structure and crystalline phases), [read more]
Elucidating nanofibre genotoxic mechanisms: An interlaboratory approach
Autores: Burgum, MJ; El-Yamani, N; Longhin, EM; Mariussen, E; Runden-Pran, E; Sosnowska, A; Reinosa, JJ; Alcolea-Rodriguez, V; Fernandez, JF; Portela, R; Puzyn, T; Banares, M; Clift, MJD; Dusinska, M; Doak, SH
Meeting Abstract.
Environ. Mol. Mutagen.. vol: 63. page: 0893-6692.
Fecha: AUG. 2022.
Doi: .
Resumen:
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Understanding electron transfer processes and oxygen reduction electrocatalysis in nanocrystalline Cu-MOF-74
Autores: Rodriguez, SL; Sanchez-Sanchez, M; Zamaro, JM; Fernandez, JL
Artículo.
J. Electroanal. Chem.. vol: 918. page: 1572-6657.
Fecha: AUG 1. 2022.
Doi: 10.1016/j.jelechem.2022.116489.
Resumen:
Metal-organic frameworks (MOFs) with redox properties are potentially good candidates as noble-metal free electrocatalysts due to their high specific surface area, uniform pore size and shape, and high dispersion of redox centers. Copper-based MOFs are particularly interesting as oxygen reduction electrocatalysts due to the well-known bio-affinity of this element towards oxygen in oxygen-reducing proteins. In this line, the metal-organic framework Cu-MOF-74, which has open metal sites in its 3D structure has not been studied up to date as electrocatalyst for the oxygen [read more]
Driving the Active Site Incorporation in Zeolitic Materials via the Organic Structure-Directing Agent Through Development of H-Bonds with Hydroxyl Groups
Autores: Bernardo-Maestro, B; Li, J; Perez-Pariente, J; Lopez-Arbeloa, F; Gomez-Hortiguela, L
Artículo.
Chem.-Eur. J.. vol: 28. page: 0947-6539.
Fecha: jul-26. 2022.
Doi: 10.1002/chem.202200702.
Resumen:
(1S,2S)-N-methyl-pseudoephedrine (MPS) was used as organic structure-directing agent (OSDA) for the synthesis of Mg-doped nanoporous aluminophosphates. This molecule displays a particular conformational behavior, where the presence of H-bond donor and acceptor groups provide a rigid conformational space with one asymmetric conformation preferentially occurring. MPS drives the crystallization of Mg-containing AFI materials. Characterization of these materials shows that the OSDA incorporate as protonated species, arranged as head-to-tail monomers. Combination of three-dimensional electron diffraction with high-resolution synchrotron powder X-ray diffraction allowed to locate both [read more]
Cascade Catalysis Through Bifunctional Lipase Metal Biohybrids for the Synthesis of Enantioenriched O-Heterocycles from Allenes
Autores: Naapuri, JM; Losada-Garcia, N; Rothemann, RA; Pichardo, MC; Prechtl, MHG; Palomo, JM; Deska, J
Artículo; Early Access.
ChemCatChem. vol: . page: 1867-3880.
Fecha: . .
Doi: 10.1002/cctc.202200362.
Resumen:
Lipase/metal nanobiohybrids, generated by growth of silver or gold nanoparticles on protein matrixes are used as highly effective dual-activity heterogeneous catalysts for the production of enantiomerically enriched 2,5-dihydrofurans from allenic acetates in a one-pot cascade process combining a lipase-mediated hydrolytic kinetic resolution with a metal-catalyzed allene cycloisomerization. Incorporating a novel strategy based on enzyme-polymer bioconjugates in the nanobiohybrid preparation enables excellent conversions in the process. Candida antarctica lipase B (CALB) in combination with a dextran-based polymer modifier [read more]
Recent progress in the quantitative assessment and interpretation of photoactivity
Autores: Caudillo-Flores, U; Munoz-Batista, MJ; Fernandez-Garcia, M; Kubacka, A
Review; Early Access.
Catal. Rev.-Sci. Eng.. vol: . page: 0161-4940.
Fecha: . .
Doi: 10.1080/01614940.2022.2075535.
Resumen:
The development of the photo-catalysis field is limited by a deficient quantitative assessment of photo-activity. The interplay between mass and momentum transport together with radiative transfer phenomena taking place at any photo-catalytic reaction or process makes complex such quantitative assessment. To reach this goal, the review studies the measurement, meaning, and analysis of three types of observables. The first family of observables has the reaction rate and closely connected observables as the turnover frequency as central pieces. The second family owns [read more]
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