Activation of H2O2 and superoxide production using a novel cobalt complex based on a polyampholyte

Lupano, Lucía V. Lombardo; Lázaro-Martínez, Juan Manuel; Piehl, Lidia Leonor; Celis, Emilio Rubín de; Orto, Viviana Campo Dall’

doi:10.1016/j.apcata.2013.08.002

Cited by 13 publications

(54 citation statements)

References 44 publications

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“…For this reason, the direct polarization or cross-polarization strategies commonly employed in the acquisition of 13 C ss-NMR experiments for structural purposes can detect which segments/regions of the polymeric material are close to the paramagnetic entities. With this aim, different authors have been used NMR as an approach to find out which ligands present in polymeric networks are involved in the coordination of Cu [23,24], Hg [25], Co [23,26], and Sm [27] ions in non-crystalline systems.…”

Section: Resultsmentioning

confidence: 99%

Interaction of Carbohydrate Coated Cerium-Oxide Nanoparticles with Wheat and Pea: Stress Induction Potential and Effect on Development

Milenković

Mitrović

Algarra

et al. 2019

Plants

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Reports about the influence of cerium-oxide nanoparticles (nCeO2) on plants are contradictory due to their positive and negative effects on plants. Surface modification may affect the interaction of nCeO2 with the environment, and hence its availability to plants. In this study, the uncoated and glucose-, levan-, and pullulan-coated nCeO2 were synthesized and characterized. The aim was to determine whether nontoxic carbohydrates alter the effect of nCeO2 on the seed germination, plant growth, and metabolism of wheat and pea. We applied 200 mgL−1 of nCeO2 on plants during germination (Ger treatment) or three week-growth (Gro treatment) in hydroponics. The plant response to nCeO2 was studied by measuring changes in Ce concentration, total antioxidative activity (TAA), total phenolic content (TPC), and phenolic profile. Our results generally revealed higher Ce concentration in plants after the treatment with coated nanoparticles compared to uncoated ones. Considering all obtained results, Ger treatment had a stronger impact on the later stages of plant development than Gro treatment. The Ger treatment had a stronger impact on TPC and plant elongation, whereas Gro treatment affected more TAA and phenolic profile. Among nanoparticles, levan-coated nCeO2 had the strongest and positive impact on tested plants. Wheat showed higher sensitivity to all treatments.

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Section: Resultsmentioning

confidence: 99%

Interaction of Carbohydrate Coated Cerium-Oxide Nanoparticles with Wheat and Pea: Stress Induction Potential and Effect on Development

Milenković

Mitrović

Algarra

et al. 2019

Plants

View full text Add to dashboard Cite

show abstract

“…Conventional liquid or solution state 1 H-and 13 C-NMR spectra are formed by narrow and wellresolved signals containing molecular information that can be interpreted by chemists. However, similar experiments performed in solid samples produce very broad signals, which can be up to several kHz or MHz, which prevents obtaining accurate information by direct observation of the spectra.…”

Section: Nuclear Magnetic Resonance (Nmr)mentioning

confidence: 99%

“…However, similar experiments performed in solid samples produce very broad signals, which can be up to several kHz or MHz, which prevents obtaining accurate information by direct observation of the spectra. This broadening also implies loss of sensitivity, especially when low-abundance nuclei such as 13 C (1.1%) are studied. The difference in the form of solid and liquid lines comes from the different mobility of the molecules.…”

Section: Nuclear Magnetic Resonance (Nmr)mentioning

confidence: 99%

“…However, in general, natural materials are modified with chemical crosslinking molecules to enhance their mechanical strength and applications. Furthermore, it is interesting to obtain biomimetic Cu(II) systems that are resistant to the attack by free radicals and adverse conditions of pH and temperature, which make their recovery and reutilization possible [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Design, Characterization, and Environmental Applications of Hydrogels with Metal Ion Coordination Properties

Orto¹,

Lázaro-Martínez²

2016

Emerging Concepts in Analysis and Applications of Hydrogels

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In this chapter, we discuss the design and synthesis of hydrogels and related polymeric materials with metal ion coordination properties, with the aim to review the main synthetic strategies used in the area. Then, we focus on the solid-state nuclear magnetic resonance (ss-NMR) spectroscopic technique due to its importance as a structural elucidation tool in both powdered and hydrated state, with emphasis on cross-polarization magic angle spinning (CP-MAS) and high-resolution magic angle spinning (HRMAS). Also, we explain different adsorption models, with the aim to present the methods most commonly used to analyze the uptake properties of hydrogel materials toward metal ions or organic compounds. Finally, we will discuss the applications of these materials for the removal of heavy metal ions and organic compounds, in terms of efficiency in the uptake of these ions and the different techniques commonly used to study the coordination process and the generation of reactive oxygen species (ROS) from hydrogen peroxide (H 2 O 2 ). The main aim is to provide scientists with a review of the spectroscopic techniques most commonly used for bulk and surface characterization of non-soluble materials.

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“…Also following a pseudo-first-order kinetic model, an 80% conversion of epinephrine to adrenochrome was achieved within 6 minutes. Thus the catalyst may prove useful in environmental decontamination strategies 189 . A range of zeolites containing large, medium and small pores, and exchanged with copper-cations, was studied for their use in the selective catalytic reduction (SCR) of NO with NH 3 both in the presence and absence of decane.…”

Section: Catalytic Degradation Of Environmental Pollutantsmentioning

confidence: 99%

Unpaired Electrons as Probes of Catalytic Systems

Rhodes¹

2014

Science Progress

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An overview is provided of the importance of molecular species containing unpaired electrons in catalytic systems, as revealed using ESR spectroscopy. The review aims to demonstrate the considerable extent of scientific progress that has been made in this broad topic during the past few decades. Studies of catalytically active surfaces, including zeolites, are surveyed, and the detection of radical species, formed as intermediates in their reactions, using matrix isolation and spintrapping techniques. Radical cation formation in zeolites is discussed, and the employment of muon spin rotation and relaxation techniques to study the mobility of labelled radicals in various porous and catalytic media. Among the specific types of catalytic media considered are those for photocatalysis, water splitting, degradation of environmental pollutants, hydrocarbon conversions, fuel cells and sensor devices employing graphene. The review concludes with recent developments in the study of enzymes and their reactions, using ESR-based methods.

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Activation of H2O2 and superoxide production using a novel cobalt complex based on a polyampholyte

Cited by 13 publications

References 44 publications

Interaction of Carbohydrate Coated Cerium-Oxide Nanoparticles with Wheat and Pea: Stress Induction Potential and Effect on Development

Interaction of Carbohydrate Coated Cerium-Oxide Nanoparticles with Wheat and Pea: Stress Induction Potential and Effect on Development

Design, Characterization, and Environmental Applications of Hydrogels with Metal Ion Coordination Properties

Unpaired Electrons as Probes of Catalytic Systems

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