Publications 20192020-06-29T17:58:05+02:00

Publications (2019)

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Deciphering the molecular specificity of phenolic compounds as inhibitors or glycosyl acceptors of beta-fructofuranosidase from Xanthophyllomyces dendrorhous

Authors: Ramirez-Escudero, M; Miguez, N; Gimeno-Perez, M; Ballesteros, AO; Fernandez-Lobato, M; Plou, FJ; Sanz-Aparicio, J

Article.
Sci Rep. vol: 9. page: 2045-2322.
Date: nov-25. 2019.
Doi: 10.1038/s41598-019-53948-y.

Abstract:
Enzymatic glycosylation of polyphenols is a tool to improve their physicochemical properties and bioavailability. On the other hand, glycosidic enzymes can be inhibited by phenolic compounds. In this work, we studied the specificity of various phenolics (hydroquinone, hydroxytyrosol, epigallocatechin gallate, catechol and p-nitrophenol) as fructosyl acceptors or inhibitors of the beta-fructofuranosidase from Xanthophyllomyces dendrorhous (pXd-INV). Only hydroquinone and hydroxytyrosol gave rise to the formation of glycosylated products. For the rest, an inhibitory effect on both the hydrolytic (H) [read more]

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Site-selective modification of tryptophan and protein tryptophan residues through PdNP bionanohybrid-catalysed C-H activation in aqueous media

Authors: Perez-Rizquez, C; Abian, O; Palomo, JM

Article.
Chem. Commun.. vol: 55. page: 1359-7345.
Date: nov-07. 2019.
Doi: 10.1039/c9cc06971b.

Abstract:
Herein we report for the first time the site-selective C-H bond arylation of tryptophan and tryptophan residues in proteins in aqueous media at room temperature by using a PdNP bionanohybrid as a heterogeneous catalyst. The reaction proceeds using a stable aryldiazonium salt without a base..

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Sn-Al-USY for the valorization of glucose to methyl lactate: switching from hydrolytic to retro-aldol activity by alkaline ion exchange

Authors: Iglesias, J; Moreno, J; Morales, G; Melero, JA; Juarez, P; Granados, ML; Mariscal, R; Martinez-Salazar, I

Article.
Green Chem.. vol: 21. page: 1463-9262.
Date: nov-07. 2019.
Doi: 10.1039/c9gc02609f.

Abstract:
Lactic acid and ester derivatives, which are important precursors of a wide variety of products, can be prepared via retro-aldol sugar condensation in the presence of Sn-containing zeolites. However, the preparation of these materials is often complex and requires zeolitic structures that are difficult to obtain on a commercial scale, hindering the access to this technology at the industrial level. In the present study, a comparative investigation was conducted on the preparation of a faujasite zeolite [read more]

Hydrogen thermo-photo production using Ru/TiO2: Heat and light synergistic effects

Authors: Caudillo-Flores, U; Agostini, G; Marini, C; Kubacka, A; Fernandez-Garcia, M

Article.
Appl. Catal. B-Environ.. vol: 256. page: 0926-3373.
Date: nov-05. 2019.
Doi: 10.1016/j.apcatb.2019.117790.

Abstract:
A series of ruthenium – anatase solids with noble metal loadings from 1 to 10 wt. %. was tested in the gas phase thermo-photo production of hydrogen using methanol as a sacrificial agent. Samples were characterized using X-Ray diffraction, UV-vis, X-ray photoelectron and absorption spectroscopies as well as transmission electron microscopy. A pure, high surface area anatase was present in all catalysts. It supports a ruthenium co-catalyst displaying a core-shell structure having an hcp metallic core and a RuO2-type shell structure. [read more]

MnOx-support interactions in catalytic bodies for selective reduction of NO with NH3

Authors: Serrano-Lotina, A; Monte, M; Iglesias-Juez, A; Pavon-Cadierno, P; Portela, R; Avila, P

Article.
Appl. Catal. B-Environ.. vol: 256. page: 0926-3373.
Date: nov-05. 2019.
Doi: 10.1016/j.apcatb.2019.117821.

Abstract:
Catalytic bodies for selective reduction of NOx with NH3 based on MnOx, TiO2 and sepiolite as active phase, support, and binder, respectively, were prepared. The same amount of MnOx (5 w%) was added by impregnation of the precursor over a 70/30 titania/sepiolite. One catalyst was obtained by wet equilibrium impregnation of the pre-shaped support, while the other was prepared by incipient wetness impregnation of the TiO2 and then mixed with the binder and the PGA, and finally extruded. In [read more]

Hydrogen Production by Formic Acid Decomposition over Ca Promoted Ni/SiO2 Catalysts: Effect of the Calcium Content

Authors: Faroldi, B; Paviotti, MA; Camino-Manjarres, M; Gonzalez-Carrazan, S; Lopez-Olmos, C; Rodriguez-Ramos, I

Article.
Nanomaterials. vol: 9. page: .
Date: NOV. 2019.
Doi: 10.3390/nano9111516.

Abstract:
Formic acid, a major product of biomass processing, is regarded as a potential liquid carrier for hydrogen storage and delivery. The catalytic dehydrogenation of FA to generate hydrogen using heterogeneous catalysts is of great interest. Ni based catalysts supported on silica were synthesized by incipient wet impregnation. The effect of doping with an alkaline earth metal (calcium) was studied, and the solids were tested in the formic acid decomposition reaction to produce hydrogen. The catalysts were characterized by X-ray diffraction (XRD), [read more]

Ultrasmall Cs-AlMCM-41 basic catalysts: Effects of aluminum addition on their physico-chemical and catalytic properties

Authors: Ng, EP; Abdullahi, H; Wong, KL; Gines-Molina, MJ; Maireles-Torres, P; Rigolet, S; Daou, TJ; Chia, S; Lee, HL

Article.
Microporous Mesoporous Mat.. vol: 288. page: 1387-1811.
Date: nov-01. 2019.
Doi: 10.1016/j.micromeso.2019.109599.

Abstract:
In this study, ultra-small MCM-41 mesoporous solids ([read more]

Rapid and high yield production of phospholipids enriched in CLA via acidolysis: The critical role of the enzyme immobilization protocol

Authors: Verdasco-Martin, CM; Corchado-Lopo, C; Fernandez-Lafuente, R; Otero, C

Article.
Food Chem.. vol: 296. page: 0308-8146.
Date: oct-30. 2019.
Doi: 10.1016/j.foodchem.2019.05.107.

Abstract:
Phospholipids (PL) rich in conjugated linolenic acid (CLA) have important health effects. Yields of phosphatidylcholine (PC) acidolysis with CLA use to be limited to [read more]

Lignin Depolymerization to BTXs

Authors: Serrano, L; Cecilia, JA; Garcia-Sancho, C; Garcia, A

Review.
Top. Curr. Chem.. vol: 377. page: 2365-0869.
Date: OCT. 2019.
Doi: 10.1007/s41061-019-0251-6.

Abstract:
Lignin, one of the main components of lignocellulosic biomass, is the largest renewable source of aromatics on the planet and presents an extraordinary opportunity for being used in the production of bio-based products. It can be transformed for the substitution of aromatic chemical-derived petrol as BTXs. The wide range of applications that it can be obtained from BTXs building blocks makes the selective depolymerization of lignin a great scientific challenge. This review emphasizes the different strategies for the fragmentation of lignin to monomers [read more]

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Hydrodesulfurization activity of Ni-containing unsupported Ga(x)WS2 catalysts

Authors: Zepeda, TA; de Leon, JND; Alonso, G; Infantes-Molina, A; Galindo-Ortega, YI; Huirache-Acuna, R; Fuentes, S

Article.
Catal. Commun.. vol: 130. page: 1566-7367.
Date: OCT. 2019.
Doi: 10.1016/j.catcom.2019.105760.

Abstract:
Nickel addition in the unsupported Ga-containing WS2 catalysts of varying Ga-content on their catalytic performance for the hydrodesulfurization of dibenzothiophene was studied. Nickel addition caused a drastic enhancement of the catalytic activity of the samples. The catalyst with 1.5 wt% Ni addition showed the highest activity. Besides, all Ga-loaded catalysts enhanced the hydrogenation pathway of dibenzothiophene transformation, starting with the hydrocracking reactions of the aromatic rings prior to their hydrogenation. FTIR studies of NO adsorption showed that [read more]

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Characterization of Photo-catalysts: From Traditional to Advanced Approaches

Authors: Caudillo-Flores, U; Barba-Nieto, I; Munoz-Batista, MJ; Kubacka, A; Fernandez-Garcia, M

Review.
Top. Curr. Chem.. vol: 377. page: 2365-0869.
Date: OCT. 2019.
Doi: 10.1007/s41061-019-0248-1.

Abstract:
The article provides an overview of the most relevant characterization results of heterogeneous photo-catalytic materials available in the literature. First, we present a summary of the ex situ utilization of physico-chemical characterization techniques. In the majority of current works, pre and post-reaction samples are subjected to ex situ analysis using a multitechnique approach which attempts to render information about the morphological, structural, and electronic properties of relevance to interpret photoactivity. Details of the effects on physico-chemical observables of the nanostructure and [read more]

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A Novel Approach to High-Performance Aliovalent-Substituted Catalysts-2D Bimetallic MOF-Derived CeCuOx Microsheets

Authors: Wang, QY; Li, ZM; Banares, MA; Weng, LT; Gu, QF; Price, J; Han, W; Yeung, KL

Article.
Small. vol: 15. page: 1613-6810.
Date: OCT. 2019.
Doi: 10.1002/smll.201903525.

Abstract:
Mixed transition metal oxides (MTMOs) have enormous potential applications in energy and environment. Their use as catalysts for the treatment of environmental pollution requires further enhancement in activity and stability. This work presents a new synthesis approach that is both convenient and effective in preparing binary metal oxide catalysts (CeCuOx) with excellent activity by achieving molecular-level mixing to promote aliovalent substitution. It also allows a single, pure MTMO to be prepared for enhanced stability under reaction by [read more]

Conformational sieving effect of organic structure-directing agents during the synthesis of zeolitic materials

Authors: Nieto, D; Perez-Pariente, J; Toran, E; Lopez-Arbeloa, F; Gomez-Hortiguela, L

Article.
Microporous Mesoporous Mat.. vol: 287. page: 1387-1811.
Date: OCT. 2019.
Doi: 10.1016/j.micromeso.2019.05.052.

Abstract:
In this work we find a novel conformational sieving effect during the structure-direction of two chiral organic diastereoisomers, (1R,2S)-benzyl-ephedrine and (1S,2S)-benzyl-pseudoephedrine, during the synthesis of zeolitic aluminophosphates. Protonation of each diastereoisomer can take place through two different stereochemical configurations, giving place to a new stereogenic N center that results in two stereoisomers for each molecule, with (1R,2S,NS) or (1R,2S,NR) configurations for benzyl-ephedrine or (1S,2S,NR) or (1S,2S,NS) configurations for benzyl-pseudoephedrine. Through a combination of H-1 and C-13 NMR spectroscopies and DFT + [read more]

TiO2-rGO photocatalytic degradation of an emerging pollutant: kinetic modelling and determination of intrinsic kinetic parameters

Authors: Tolosana-Moranchel, A; Manassero, A; Satuf, ML; Alfano, OM; Casas, JA; Bahamonde, A

Article.
J. Environ. Chem. Eng.. vol: 7. page: 2213-2929.
Date: OCT. 2019.
Doi: 10.1016/j.jece.2019.103406.

Abstract:
An intrinsic kinetic model, derived from a suggested reaction photo-mechanism and with an explicit dependence on the local volumetric rate of photon absorption (LVRPA), was developed to simulate the photocatalytic degradation of clofibric acid and the main reaction intermediates, with a new titania-reduced graphene oxide nanocomposite (TiO2-rGO), The proposed reaction mechanism takes into account that graphene behaves as an electron acceptor and, therefore, this effect was included in the derivation of the reaction rate expressions and in the [read more]

Optimized immobilization of polygalacturonase from Aspergillus niger following different protocols: Improved stability and activity under drastic conditions

Authors: Dal Magro, L; Kornecki, JF; Klein, MP; Rodrigues, RC; Fernandez-Lafuente, R

Article.
Int. J. Biol. Macromol.. vol: 138. page: 0141-8130.
Date: oct-01. 2019.
Doi: 10.1016/j.ijbiomac.2019.07.092.

Abstract:
Polygalacturonase (PG) from Aspergillus niger was immobilized using glyoxyl, vinylsulfone or glutaraldehyde-activated supports. The use of supports pre-activated with glutaraldehyde presented the best results. The immobilization of PG on glutaraldehyde-supports was studied under different conditions: at pH 5 for 24 h; at pH 5, 6.5 or 8 for 3 h and then incubated at pH 8 for 24 h; at pH 8 in the presence of 300 mM NaCl for 24 h, to prevent ion exchange. The immobilization under [read more]

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