scholarly journals FAD roles in glucose catalytic oxidation studied by multiphase flow of extractive electrospray ionization (MF-EESI) mass spectrometry

2018 ◽  
Vol 9 (3) ◽  
pp. 594-599 ◽  
Author(s):  
Yan Wang ◽  
Min Sun ◽  
Jinping Qiao ◽  
Jin Ouyang ◽  
Na Na
Keyword(s):  
Mass Spectrometry ◽  
Multiphase Flow ◽  
Electrospray Ionization ◽  
Catalytic Oxidation ◽  
Flavin Adenine Dinucleotide ◽  
Ionization Method ◽  
Oxidation Of Glucose

The role of the coenzyme flavin adenine dinucleotide (FAD) in the catalytic oxidation of glucose was elucidated by MS using a new extraction and ionization method.

Role of sterics in phosphine-ligated gold clusters

2019 ◽  
Vol 21 (4) ◽  
pp. 1689-1699 ◽  
Author(s):  
Katherine A. Parrish ◽  
Mary King ◽  
Marshall R. Ligare ◽  
Grant E. Johnson ◽  
Heriberto Hernández
Keyword(s):  
Mass Spectrometry ◽  
Electrospray Ionization ◽  
Ligand Exchange ◽  
Gold Clusters ◽  
Solution Phase ◽  
Ionization Mass ◽  
Exchange Reactions ◽  
The Stability ◽  
Insight Into

This study examined the solution-phase exchange reactions of triphenylphosphine (PPh3) ligands on Au8L72+ (L = PPh3) gold clusters with three different tolyl ligands using electrospray ionization mass spectrometry to provide insight into how steric differences in the phosphines influence the extent of ligand exchange and the stability of the resulting mixed-phosphine clusters.

The role of ionic liquids in co-catalysis of Baylis-Hillman reaction: interception of supramolecular species via electrospray ionization mass spectrometry

2006 ◽  
Vol 19 (11) ◽  
pp. 731-736 ◽  
Author(s):  
Leonardo Silva Santos ◽  
Brenno A. DaSilveira Neto ◽  
Crestina S. Consorti ◽  
Cesar Henrique Pavam ◽  
Wanda P. Almeida ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ionic Liquids ◽  
Electrospray Ionization ◽  
Electrospray Ionization Mass Spectrometry ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass

scholarly journals Modification of Gold Zeolitic Supports for Catalytic Oxidation of Glucose to Gluconic Acid

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5250
Author(s):  
Adrian Walkowiak ◽  
Joanna Wolska ◽  
Anna Wojtaszek-Gurdak ◽  
Izabela Sobczak ◽  
Lukasz Wolski ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Gluconic Acid ◽  
Supported Catalysts ◽  
Reaction Pathway ◽  
Three Dimensional ◽  
Au Nps ◽  
Zeolite Lattice ◽  
Zeolite Supports ◽  
Oxidation Of Glucose

Activity of gold supported catalysts strongly depends on the type and composition of support, which determine the size of Au nanoparticles (Au NPs), gold-support interaction influencing gold properties, interaction with the reactants and, in this way, the reaction pathway. The aim of this study was to use two types of zeolites: the three dimensional HBeta and the layered two-dimensional MCM-36 as supports for gold, and modification of their properties towards the achievement of different properties in oxidation of glucose to gluconic acid with molecular oxygen and hydrogen peroxide. Such an approach allowed establishment of relationships between the activity of gold catalysts and different parameters such as Au NPs size, electronic properties of gold, structure and acidity of the supports. The zeolites were modified with (3-aminopropyl)-trimethoxysilane (APMS), which affected the support features and Au NPs properties. Moreover, the modification of the zeolite lattice with boron was applied to change the strength of the zeolite acidity. All modifications resulted in changes in glucose conversion, while maintaining high selectivity to gluconic acid. The most important findings include the differences in the reaction steps limiting the reaction rate depending on the nature of the oxidant applied (oxygen vs. H2O2), the important role of porosity of the zeolite supports, and accumulation of negative charge on Au NPs in catalytic oxidation of glucose.

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