Nanostructured poly(3,4-ethylenedioxythiophene)–metalloporphyrin films: Improved catalytic detection of peroxynitrite

Peteu, Serban F.; Peiris, Pubudu M.; Gebremichael, Ermias; Bayachou, Mekki

doi:10.1016/j.bios.2010.01.008

Cited by 37 publications

(49 citation statements)

References 18 publications

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“…The aim of this work is to illustrate how the introduction of complexed Fe(III) ion into the network structure of the BADGE, n = 0 resin transfers the magnetic properties of the ion to the new material. Hemin has many potential applications as catalyst for reactions related to energy and environment, includ-ing the electrochemical reduction of uranium [15], nitrite [16,17], nitric oxide [18][19][20], hydrogen peroxide [21], carbon dioxide [22], and oxidation of peroxynitrite [23]. Hemin is also able to catalyze the oxygen reduction reaction [24].…”

Section: Introductionmentioning

confidence: 99%

Paramagnetic epoxy resin

Barreiro¹,

Fraga²,

Jover³

et al. 2017

Express Polym. Lett.

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Abstract. This work illustrates that macrocycles can be used as crosslinking agents for curing epoxy resins, provided that they have appropriate organic functionalities. As macrocycles can complex metal ions in their structure, this curing reaction allows for the introduction of that metal ion into the resin network. As a result, some characteristic physical properties of the metallomacrocycle could be transferred to the new material. The bisphenol A diglycidyl ether (BADGE, n = 0) and hemin (a protoporphyrin IX containing the Fe(III) ion, and an additional chloride ligand) have been chosen. The new material has been characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier Transform Infrared (FT-IR), Nuclear Magnetic Resonance (NMR), Transmission Electron Microscopy (TEM), and magnetic susceptibility measurements). Fe(III) remains in the high-spin state during the curing process and, consequently, the final material exhibits the magnetic characteristics of hemin. The loss of the chlorine atom ligand during the cure of the resin allows that Fe(III) can act as Lewis acid, catalyzing the crosslinking reactions. At high BADGE n = 0/hemin ratios, the formation of ether and ester bonds occurs simultaneously during the process.

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Section: Introductionmentioning

confidence: 99%

Paramagnetic epoxy resin

Barreiro¹,

Fraga²,

Jover³

et al. 2017

Express Polym. Lett.

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“…More specifically, we have reported for the first time the actuation of individual polypyrrole nanowires of 50 nm diameter, when triggered electrochemically in solution by volume change, as the result of its oxidation [42,44]. Moreover, very recently, a nano-PEDOT-based interface has evidenced a 50 times increase in sensitivity of electrochemical detection events, as a result of the catalytic synergy of the nano-PEDOT with a metallo-porphyrin [43].…”

Section: Intelligent Responsive Polymers With Integrated Sensing-relementioning

confidence: 97%

“…Electroactive polymers (EAPs) such as polypyrrole, polyaniline, polyethylenedioxythiophene (PEDOT), exhibit a high conductivity, mediate rapid electron transfer and can be synthesized under mild conditions through simple deposition onto conductive surfaces from monomer solutions with precise electrochemical control [43].…”

Section: Intelligent Responsive Polymers With Integrated Sensing-relementioning

confidence: 99%

“…The advanced use of these conducting polymers in actuators and sensors has grown over the past decade, equally due to their compliance and compatibility with nano-fabrication. These soft, "synthetic metals" were proven to enhance sensitivity of nanobiosensors or to deliver actuation at true nanoscale [41][42][43][44][45]. Poly(lactide-co-glycolide) microspheres and poly(HEMAco-DMAEMA) hydrogels…”

Section: Electric Field Responsive Polymersmentioning

confidence: 99%

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Responsive Polymers for Crop Protection

et al. 2010

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This review outlines the responsive polymer methods currently in use with their potential application to plant protection and puts forward plant-specific mechanisms as stimuli in newly devised methods for smart release of crop protection agents (CPAs). CPAs include chemicals (fungicides, insecticides, herbicides), biochemicals (antibiotics, RNAbased vaccines for plant viruses), semiochemicals (pheromones, repellents, allomones), microbial pesticides, growth regulators (insect and plant) or micronutrients, all with crop protection effects. This appraisal focuses on emerging uses of polymer nano-encapsulated CPAs. Firstly, the most interesting advances in controlled release methods are critically discussed with their advantages and drawbacks. Secondly, several plant-specific stimulibased smart methods are anticipated for use alongside the polymer nano-or microcapsules. These new CPA release methods are designed to (i) protect plants against infection produced by fungi or bacteria, and (ii) apply micro-nutrients when the plants need it the most. Thus, we foresee (i) the responsive release of nano-encapsulated bioinsecticides regulated by plant stress enzymes, and (ii) the delivery of micro-nutrients synchronized by the nature or intensity of plant root exudates. Such continued advances of nano-scale smart polymer-based CPAs for the protection of crops herald a "small revolution" for the benefit of sustainable agriculture.Keywords: responsive polymers; crop protection agent (CPA); CPA nanocapsule; nanoscience; nanotechnology; plant-specific stimuli; intelligent self-regulated release OPEN ACCESSPolymers 2010, 2 230 Glossary of TermsAllomone: a pheromone that induces a behavioral or physiological change in a member of another species that is of benefit to the producer. Bio-insecticide: the natural substance made and used for eliminating plant-eating insects. Cuticle: the layer of cutin (waxy waterproof substance, consisting of derivatives of fatty acids) covering the epidermis of the aerial parts of plants. Elicitor: a substance that induces the defense mechanisms in higher plants. Epidermis: the outer protective layer of plant cells. Parasitic plant: a plant that derives some or all of its sustenance from another plant. Perennial plant: a plant that lives for more than two years. Phloem: a plant tissue that conducts organic nutrients substances to all parts of the plant. Phytopathogen: an organism that causes a disease in a plant. RNA-based vaccines for plant viruses: Double-stranded RNA (dsRNA) is a RNA with two complementary strands, which is converted to small interfering (siRNA), involved in the RNA interference (RNAi) pathway, including plant viruses RNA silencing. Root exudate: any substance released through the pores of a diseased or injured plant root.

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“…All electrochemical measurement of NO synthesis from NOScarying liposomes is performed on freshly prepared NOSliposomes (1-2 days). Experimental details about the NO-sensor are found elsewhere [23] as well as in other reports about other CFE microsensors developed in our labs [26]. Briefly, this NO microsensor was fabricated as follows.…”

Section: Special Issuementioning

confidence: 99%

Nitric Oxide Synthase Encapsulation in Liposomes: a Potential Delivery Platform to (Nitric Oxide)‐Deficient Targets

et al. 2012

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Nitric oxide (NO) is a freely diffusible, gaseous free radical, associated with many physiological and pathological processes: such as neuronal signaling, immune response and inflammatory response. In mammalian organisms, NO is produced from l-arginine in an NADPH-dependent reaction catalyzed by a family of nitric oxide synthase (NOS) enzymes. Typically, large NO fluctuations in biological systems under/over a critical limit is associated with problems that range from transient dysfunctions to severe chronic disease states. In this regard, we explore the development of a potential delivery and release method of nitric oxide to NO-deficient sites using liposomes as vehicles. Liposomes have already been used as effective nano-carriers. In this short communication, we report on the preparation and characterization of liposomes carrying a recombinant NOS enzyme. We report on the efficacy of using liposomes to carry NOS enzymes, and on the extent of preservation of native NOS structure and function. In addition to the characterization of liposome stability and recovery of enzymatic activity after encapsulation in liposomes, we also measured the NO production upon NOS stimulation. The NO release was monitored with a nitric oxide ultrasensitive electrochemical microsensor placed near NOS-carrying liposomes. This method of NOS-carrying liposomes shows the promise of potential development as a platform for targeted NO-delivery.

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Nanostructured poly(3,4-ethylenedioxythiophene)–metalloporphyrin films: Improved catalytic detection of peroxynitrite

Cited by 37 publications

References 18 publications

Paramagnetic epoxy resin

Paramagnetic epoxy resin

Responsive Polymers for Crop Protection

Nitric Oxide Synthase Encapsulation in Liposomes: a Potential Delivery Platform to (Nitric Oxide)‐Deficient Targets

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