CuII(Sal-Ala)/CuAlLDH Hybrid as Novel Efficient Catalyst for Artificial Superoxide Dismutase (SOD) and Cyclohexene Oxidation by H2O2

Mureşeanu, Mihaela; Puscasu, M.C.; Şomăcescu, Simona; Cârjă, Gabriela

doi:10.1007/s10562-015-1555-y

Cited by 17 publications

(9 citation statements)

References 48 publications

(51 reference statements)

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“…[7] However,s upplementation of SOD is difficult owing to its high sensitivity to environmentalc onditions (e.g.,t emperature, pH, and complex nature in biofluids). Therefore, significante fforts have been made to prepare metal complexes, [8][9][10][11][12] nanoparticles or colloidalp articles, [13] or their combinations [14][15][16][17][18] to obtain artificial SOD materials of similara ctivity,b ut with improved sensitivity relative to that of the native enzyme.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Superoxide Dismutase on Polyelectrolyte‐Functionalized Titania Nanosheets

2017

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The superoxide dismutase (SOD) enzyme was successfully immobilized on titania nanosheets (TNS) functionalized with the poly(diallyldimethylammonium chloride) (PDADMAC) polyelectrolyte. The TNS-PDADMAC solid support was prepared by hydrothermal synthesis followed by self-assembled polyelectrolyte layer formation. It was found that SOD strongly adsorbed onto oppositely charged TNS-PDADMAC through electrostatic and hydrophobic interactions. The TNS-PDADMAC-SOD material was characterized by light scattering and microscopy techniques. Colloidal stability studies revealed that the obtained nanocomposites possessed good resistance against salt-induced aggregation in aqueous suspensions. The enzyme kept its functional integrity upon immobilization; therefore, TNS-PDADMAC-SOD showed excellent superoxide radical anion scavenging activity. The developed system is a promising candidate for applications in which suspensions of antioxidant activity are required in the manufacturing processes.

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Section: Introductionmentioning

confidence: 99%

Immobilization of Superoxide Dismutase on Polyelectrolyte‐Functionalized Titania Nanosheets

2017

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“…The oxidation of cyclohexene with H 2 O 2 in acetonitrile, under an air atmosphere, was selected as a test reaction to determine the catalytic performances of the SBA-15-supported Cu(II)-Schiff base complex. The optimization of the CH oxidation was previously performed [8] and the best operation parameters were established to be a 5 h reaction run at 60 • C with 0.03 mmol catalyst, 10 mL of solvent and a 2.2/1 H 2 O 2 /C 6 H 10 molar ratio. Synergic effects for the catalytic activity given by the SBA-15 silica surface and the acetonitrile solvent were observed.…”

Section: Catalytic Tests 221 Catalytic Performances Of the Cu(ii) Com...mentioning

confidence: 99%

“…Both CH conversion and TOF values were, however, slightly diminished after repeated use, probably due to a change in the morphology of the mesoporous material or in the catalytically active center surroundings. The biomimetic comportment of free or immobilized Cu(II)-BrAld complexes was tested for SOD activity [8]. All materials, except the silica support, presented catalytic activity in the dismutation reaction of superoxide radicals (O 2 − ).…”

Section: Stability Of Cu(ii) Complex/sba-15 In the Cyclohexene Oxidat...mentioning

confidence: 99%

“…For a biomimetic heterogeneous catalyst to be performant in superoxide scavenging, it is important that the support allows a good interaction with the catalyst and a good accessibility of the substrate to the metal ion active sites. Several metal complexes have proven biomimetic SOD activity when they were immobilized into different supports [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Anchoring of Copper(II)–Schiff Base Complex in SBA-15 Matrix as Efficient Oxidation and Biomimetic Catalyst

Mureseanu,

Bleotu,

Spînu

et al. 2024

IJMS

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A new mononuclear Cu(II) complex [Cu(L2)(H2O)2], where L is the Schiff base 2-[2-(3-bromopropoxy)benzylideneamino] benzoic acid, was synthesized and covalently anchored onto an amino-functionalized SBA-15 mesoporous silica in order to obtain an efficient heterogeneous catalyst. The elemental, structural, textural and morphological characterization confirmed the coordination of the central Cu(II) ion with two ligands and two H2O molecules in the synthesized complex and its successful immobilization into the inner pore surface of the NH2-functionalized support without the loss of the mesoporous structure. The catalytic activity of the free or immobilized Cu(II) complex was tested in the oxidation of cyclohexene with H2O2 under an air atmosphere and the dismutation reaction of the superoxide radical anions with very good results. In addition, catalyst reuse tests claim its suitability in alkene oxidation processes or as a biomimetic catalyst.

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“…For P1-Cu-3/1, Figure 3C revealed that both the binding energy and intensity in the N 1S region were greater than those of P1. Furthermore, there was a shoulder peak at 934.0 eV for Cu 2p 3/2 peaks (Figure 3D), which could be attributed to the Cu/N coordination complex, and the shake-up peaks at 939.9-943.9 eV and at 962.8 eV indicated the presence of partly coordinated Cu 2+ [29,30]. The charging of the electron cloud environments of the N and Cu atoms indicated that the lone pair electrons of the nitrogen atoms transferred to the empty orbitals of Cu 2+ ions, contributing to the physical crosslinking of the obtained elastomers.…”

Section: Hydrogen-bonded and Metal-coordinated Elastomersmentioning

confidence: 99%

Poly(β-hydroxyl amine)s: Valuable Building Blocks for Supramolecular Elastomers with Tunable Mechanical Performance and Superior Healing Capacity

Wang

Zhou

et al. 2022

Polymers

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Supramolecular elastomers integrated with high mechanical toughness and excellent self-healing ability offer attractive applications in various fields such as biomedical materials and wearable electronics. However, the multistep preparation process for creating functional polymer precursors and the expensive stock materials required are two factors that limit the widespread use of supramolecular elastomers. Herein, for the first time, poly(β-hydroxyl amine)s generated by amine-epoxy polymerization were used in the development of supramolecular polymer materials. Based on the novel silicon-containing poly(β-hydroxyl amine)s synthesized by the polymerization between 1,3-bis(3-glycidyloxypropyl)tetramethyldisiloxane and 3-amino-1,2-propanediol, dually cross-linked supramolecular elastomers with both hydrogen bonding and metal coordination were achieved, displaying adjustable mechanical properties with the tensile strength varying from 0.70 MPa to 2.52 MPa, respectively. Thanks to the dynamic nature of the supramolecular interactions, these elastomers exhibited favorable hot-pressing reprocessability and excellent self-healing performance, with the healing efficiency reaching up to 98% at 60 °C for 48 h. Potential applications for photoluminescent materials and flexible electronic devices were demonstrated. We believe that its simplicity of synthesis, adjustable mechanical properties, and robust self-healing capacities bode well for future applications of this new supramolecular elastomer.

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CuII(Sal-Ala)/CuAlLDH Hybrid as Novel Efficient Catalyst for Artificial Superoxide Dismutase (SOD) and Cyclohexene Oxidation by H2O2

Cited by 17 publications

References 48 publications

Immobilization of Superoxide Dismutase on Polyelectrolyte‐Functionalized Titania Nanosheets

Immobilization of Superoxide Dismutase on Polyelectrolyte‐Functionalized Titania Nanosheets

Anchoring of Copper(II)–Schiff Base Complex in SBA-15 Matrix as Efficient Oxidation and Biomimetic Catalyst

Poly(β-hydroxyl amine)s: Valuable Building Blocks for Supramolecular Elastomers with Tunable Mechanical Performance and Superior Healing Capacity

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