Catalytic cooperativity between glucose oxidase and gold nanoparticles in the sequential oxidation of glucose to saccharic acid

Abstract

There exists great potential in combining heterogeneous metallic nanoparticle active sites and enzymatic active sites for sequentially catalysed chemical transformations. This study provides an illustrative system where glucose oxidase and...

Surfactant- and Ligand-Free Synthesis of Platinum Nanoparticles in Aqueous Solution for Catalytic Applications

“…Figure 5A and B show first order H2O2 decomposition kinetics at pH 7 and pH 10, respectively. It is known that H2O2 decomposition rates are higher in more alkaline solutions [24,44,49,51,52]. Our results show that this is also the case for these Pt nanoparticles.…”

“…Hexacyanoferrate(III) ions form during gold mining processes when cyanide is used to extract Au, but co-located iron and other metals also form complexes with the cyanide [23]. H 2 O 2 decomposition has great significance, as H 2 O 2 can be used as an oxidant for many reactions, such as glucose oxidation [24][25][26], partial oxidation of methane [27][28][29][30], epoxidation of alkenes [7,8,[31][32][33][34], wastewater treatment [35], and as a precursor for oxidative radicals in the presence of a Fenton catalyst [36][37][38][39], to name a few examples. Additionally, Pt catalysts have also been used as a H 2 O 2 decomposition catalyst in contact lens cleaning solutions [40].…”

Enhancing the Chemo-Enzymatic One-Pot Oxidation of Cyclohexane via In Situ H2O2 Production over Supported Pd-Based Catalysts

“…The role of the chemo-catalyst/enzyme ratio has previously been identified to be crucial in optimizing the overall efficiency of a number of processes. , Given the susceptibility of the enzyme to deactivate in the presence of even mild concentrations of H 2 O 2 and the role of the chemo-catalyst in promoting competitive H 2 O 2 degradation pathways, it is clear that optimizing this parameter is crucial for achieving maximum process efficiency. As such, and with a focus on key catalyst formulations, a series of cyclohexane oxidation experiments were conducted using a fixed mass of chemo-catalyst (0.001 g) and varied concentration of enzyme (15–45 U mL RM –1 ) (Figure S2 and associated supplementary note), with an optimal PaDa-I concentration of 15 U mL RM –1 identified.…”

Efficient cascade conversion of starch to gluconic acid by a chemoenzymatic system with co-immobilized Au nanoparticles and enzymes

“…3 Over the past few decades, a large number of chemoenzymatic cascade catalytic systems with outstanding overall efficiency have been developed, providing an opportunity to broaden the application of more valuable reactions. 4–6…”

“…3 Over the past few decades, a large number of chemoenzymatic cascade catalytic systems with outstanding overall efficiency have been developed, providing an opportunity to broaden the application of more valuable reactions. [4][5][6] Gluconic acid, as an odorless, non-toxic, non-volatile, and easily biodegradable weak acid, has been widely applied in the fields of medicine, food, and manufacturing. Among the production methods for gluconic acid, enzymatic production is considered a superior method for the production of gluconic acid, due to its mild reaction conditions, simple operation, and high substrate specificity.…”