Relevant bibliographies by topics / Redox labels

Academic literature on the topic 'Redox labels'

Author: Grafiati
Published: 7 July 2024
Last updated: 7 July 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Journal articles on the topic "Redox labels":

1

Koyappayil, Aneesh, and Min-Ho Lee. "Ultrasensitive Materials for Electrochemical Biosensor Labels." Sensors 21, no. 1 (December 25, 2020): 89. http://dx.doi.org/10.3390/s21010089.

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Since the fabrication of the first electrochemical biosensor by Leland C. Clark in 1956, various labeled and label-free sensors have been reported for the detection of biomolecules. Labels such as nanoparticles, enzymes, Quantum dots, redox-active molecules, low dimensional carbon materials, etc. have been employed for the detection of biomolecules. Because of the absence of cross-reaction and highly selective detection, labeled biosensors are advantageous and preferred over label-free biosensors. The biosensors with labels depend mainly on optical, magnetic, electrical, and mechanical principles. Labels combined with electrochemical techniques resulted in the selective and sensitive determination of biomolecules. The present review focuses on categorizing the advancement and advantages of different labeling methods applied simultaneously with the electrochemical techniques in the past few decades.
2

Le Gal La Salle, A., B. Limoges, S. Rapicault, C. Degrand, and P. Brossier. "New immunoassay techniques using Nafion-modified electrodes and cationic redox labels or enzyme labels." Analytica Chimica Acta 311, no. 3 (August 1995): 301–8. http://dx.doi.org/10.1016/0003-2670(95)00064-7.

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Evtugyn, Gennady A., Anna V. Porfireva, and Ivan I. Stoikov. "Electrochemical DNA sensors based on spatially distributed redox mediators: challenges and promises." Pure and Applied Chemistry 89, no. 10 (September 26, 2017): 1471–90. http://dx.doi.org/10.1515/pac-2016-1124.

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AbstractDNA and aptasensors are widely used for fast and reliable detection of disease biomarkers, pharmaceuticals, toxins, metabolites and other species necessary for biomedical diagnostics. In the overview, the concept of spatially distributed redox mediators is considered with particular emphasis to the signal generation and biospecific layer assembling. The application of non-conductive polymers bearing redox labels, supramolecular carriers with attached DNA aptamers and redox active dyes and E-sensor concept are considered as examples of the approach announced.
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Iglesias-Mayor, Alba, Olaya Amor-Gutiérrez, Agustín Costa-García, and Alfredo de la Escosura-Muñiz. "Nanoparticles as Emerging Labels in Electrochemical Immunosensors." Sensors 19, no. 23 (November 23, 2019): 5137. http://dx.doi.org/10.3390/s19235137.

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This review shows recent trends in the use of nanoparticles as labels for electrochemical immunosensing applications. Some general considerations on the principles of both the direct detection based on redox properties and indirect detection through electrocatalytic properties, before focusing on the applications for mainly proteins detection, are given. Emerging use as blocking tags in nanochannels-based immunosensing systems is also covered in this review. Finally, aspects related to the analytical performance of the developed devices together with prospects for future improvements and applications are discussed.
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Ben Jrad, Amani, Hussein Kanso, Delphine Raviglione, Thierry Noguer, Nicolas Inguimbert, and Carole Calas-Blanchard. "Salen/salan metallic complexes as redox labels for electrochemical aptasensors." Chemical Communications 55, no. 85 (2019): 12821–24. http://dx.doi.org/10.1039/c9cc07575e.

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Smiljanic, Milutin, Pierre Bleteau, Alexia Papageorgiou, Nathan Goffart, Catherine Adam, and Thomas Doneux. "Introducing common oxazine fluorophores as new redox labels for electrochemical DNA sensors." Bioelectrochemistry 155 (February 2024): 108582. http://dx.doi.org/10.1016/j.bioelechem.2023.108582.

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Ma, Xiaohua, Dehua Deng, Ning Xia, Yuanqiang Hao, and Lin Liu. "Electrochemical Immunosensors with PQQ-Decorated Carbon Nanotubes as Signal Labels for Electrocatalytic Oxidation of Tris(2-carboxyethyl)phosphine." Nanomaterials 11, no. 7 (July 5, 2021): 1757. http://dx.doi.org/10.3390/nano11071757.

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Nanocatalysts are a promising alternative to natural enzymes as the signal labels of electrochemical biosensors. However, the surface modification of nanocatalysts and sensor electrodes with recognition elements and blockers may form a barrier to direct electron transfer, thus limiting the application of nanocatalysts in electrochemical immunoassays. Electron mediators can accelerate the electron transfer between nanocatalysts and electrodes. Nevertheless, it is hard to simultaneously achieve fast electron exchange between nanocatalysts and redox mediators as well as substrates. This work presents a scheme for the design of electrochemical immunosensors with nanocatalysts as signal labels, in which pyrroloquinoline quinone (PQQ) is the redox-active center of the nanocatalyst. PQQ was decorated on the surface of carbon nanotubes to catalyze the electrochemical oxidation of tris(2-carboxyethyl)phosphine (TCEP) with ferrocenylmethanol (FcM) as the electron mediator. With prostate-specific antigen (PSA) as the model analyte, the detection limit of the sandwich-type immunosensor was found to be 5 pg/mL. The keys to success for this scheme are the slow chemical reaction between TCEP and ferricinum ions, and the high turnover frequency between ferricinum ions, PQQ. and TCEP. This work should be valuable for designing of novel nanolabels and nanocatalytic schemes for electrochemical biosensors.
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Grabowska, Iwona, Maria Hepel, and Katarzyna Kurzątkowska-Adaszyńska. "Advances in Design Strategies of Multiplex Electrochemical Aptasensors." Sensors 22, no. 1 (December 27, 2021): 161. http://dx.doi.org/10.3390/s22010161.

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In recent years, the need for simple, fast, and economical detection of food and environmental contaminants, and the necessity to monitor biomarkers of different diseases have considerably accelerated the development of biosensor technology. However, designing biosensors capable of simultaneous determination of two or more analytes in a single measurement, for example on a single working electrode in single solution, is still a great challenge. On the other hand, such analysis offers many advantages compared to single analyte tests, such as cost per test, labor, throughput, and convenience. Because of the high sensitivity and scalability of the electrochemical detection systems on the one hand and the specificity of aptamers on the other, the electrochemical aptasensors are considered to be highly effective devices for simultaneous detection of multiple-target analytes. In this review, we describe and evaluate multi-label approaches based on (1) metal quantum dots and metal ions, (2) redox labels, and (3) enzyme labels. We focus on recently developed strategies for multiplex sensing using electrochemical aptasensors. Furthermore, we emphasize the use of different nanomaterials in the construction of these aptasensors. Based on examples from the existing literature, we highlight recent applications of multiplexed detection platforms in clinical diagnostics, food control, and environmental monitoring. Finally, we discuss the advantages and disadvantages of the aptasensors developed so far, and debate possible challenges and prospects.
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Chunglok, Wilanee, Porntip Khownarumit, Patsamon Rijiravanich, Mithran Somasundrum, and Werasak Surareungchai. "Electrochemical immunoassay platform for high sensitivity protein detection based on redox-modified carbon nanotube labels." Analyst 136, no. 14 (2011): 2969. http://dx.doi.org/10.1039/c1an15079k.

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Degrand, Chantal, Benoit Limoges, Arnaud Gautier, and Ronald L. Blankespoor. "Synthesis of cobaltocenium salts for use as redox labels and their incorporation into Nafion films." Applied Organometallic Chemistry 7, no. 4 (July 1993): 233–41. http://dx.doi.org/10.1002/aoc.590070403.

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You might also be interested in the extended bibliographies on the topic 'Redox labels' for particular source types:
Journal articles

Dissertations / Theses on the topic "Redox labels":

1

Gaillard, Michel. "Nouveaux marqueurs électroactifs pour le développement de biocapteurs environnementaux." Electronic Thesis or Diss., Perpignan, 2023. https://theses-public.univ-perp.fr/2023PERP0054.pdf.

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De nos jours, l'évolution du climat, les rejets anthropiques et l’augmentation de la population mondiale concourent à un accroissement du nombre de bactéries préoccupantes, des rejets médicamenteux et des toxines dans l’environnement. L’ochratoxine A, l’estradiol, et certaines bactéries font partie des contaminants polluant la nature et menaçant la santé des êtres vivants. Dans une optique de détection de ces éléments potentiellement dangereux, nous avons travaillé sur le développement d’un marquage original d'oligonucléotides. Ce marquage est basé sur l’utilisation de complexes métalliques électroactifs comme des sondes redox. Ces complexes sont basés sur les ligands macrocycles DOTA et NOTA, d’ordinaire majoritairement utilisés dans l’imagerie médicale, fonctionnalisés avec du fer (III). L’étude de leurs propriétés électrochimiques, réalisée par voltampérométrie cyclique, a démontré qu’ils présentaient de nombreux atouts faisant concurrence aux composés redox les plus répandus. Nous avons notamment cherché à appliquer ce marquage d’oligonucléotide à la construction de biocapteurs, avec en premier essai un génocapteur pour la détection d’ADN de bactéries Vibrio. La conception du capteur et la détection de cible a été suivie par spectroscopie d’impédance. Toutefois, l’analyse par impédance n’a pas permis d’obtenir les résultats espérés, et, afin d’étendre le champ de notre étude, une autre méthode a été testée.C’est pourquoi, nous avons cherché à coupler directement les complexes métalliques à des aptamères via une réaction entre une fonction thiol et un groupement maléimide. Dans l’étape suivante, les biocapteurs ont été construits en immobilisant les aptamères modifiés sur des électrodes. En parallèle, les interactions aptamères-cible ont été quantifiées par des analyses par thermophorèse ou MST pour confirmer certains résultats et valider les caractéristiques de liaison des aptamères
Nowadays, climate change, anthropogenic releases and the increase in the world's population are contributing to an increase in the number of bacteria of concern, drug releases and toxins into the environment. Ochratoxin A, estradiol, and some bacteria are among the contaminants polluting nature and threatening the health of living beings. In order to detect these potentially harmful elements, we worked on the development of an original oligonucleotide labeling. This marking is based on the use of electroactive metal complexes such as redox probes.These complexes are based on the macrocycle ligands DOTA and NOTA, usually mainly used in medical imaging, functionalized with iron (III). The study of their electrochemical properties, carried out by cyclic voltammetry, has shown that they have many advantages competing with the most common redox compounds. In particular, we sought to apply this oligonucleotide labeling to the construction of biosensors, with the first test of a genosensor for the detection of DNA from Vibrio bacteria. Sensor design and target detection were followed by impedance spectroscopy. However, impedance analysis did not achieve the expected results, and in order to extend the scope of our study, another method was tested. Therefore, we sought to couple metal complexes directly to aptamers via a reaction between a thiol function and a maleimide. In the next step, the biosensors were built by immobilizing the modified aptamers on electrodes. In parallel, aptamer-target interactions were quantified by thermophoresis or MST analyses to confirm certain results and validate the binding characteristics of aptamers
2

Ho, M. Y. "An investigation of redox self-assembled monolayer in label-free biosensor application." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604101.

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This dissertation investigates a label-free sensing platform which can be used to detect DNA, enzyme or protein, based upon electrochemical detection which is suitable for implementation in microarray form. Two implementations are proposed based on mixed Ferrocene self-assembled monolayer (SAM) and the Azurin (metalloprotein) SAM. We have shown for the first time that electro-active SAM, functionalized with suitable receptors, can be employed for the detection of biomolecular interactions. Detection of streptavidin by biotin-functionalized Ferrocene SAM was successfully demonstrated. These results were made possible by the development of the fabrication protocols that optimize the SAM stability and reproducibility. Reliable samples, combined with theoretical modelling and modification of existing published model for electro-active SAM, has enabled us to experiment and analyse in depth various electrochemical detection techniques, based on changes in capacitance, voltammetric formal potential and current, Open Circuit Potential (OCP). It was found that AC voltammetry and OCP are the best measurement techniques. The use of OCP with an electro-active SAM had not been previously demonstrated and the theoretical basis for this technique was presented. Essential for this technique was the development of micro-electrodes to reduce parasitic capacitances that would reduce the available signal, enabling real-time detection of bio-molecular interaction. We also made possible to characterize the binding of a protein (streptavidin) to a biotin-functionalized Azurin SAM. Also a numerical analysis has been developed to analyse the effect of design parameters of the platform, such as the probe density and buffer concentration, which can greatly affect the assay sensitivity. This is achieved using 3D simulation with finite element method in COMSOL.
3

Chandra, Sudeshna, Christian Gäbler, Christian Schliebe, Heinrich Lang, and Dhirendra Bahadur. "Fabrication of a label-free electrochemical immunosensor using a redox active ferrocenyl dendrimer." Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-220086.

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We report an IgG (=immunoglobulin) electrochemical immunosensor using a newly synthesized redox-active ferrocenyl dendrimer of generation 2 (G2Fc) as a voltammetric transducer. The ferrocenyl dendrimer N(CH2CH2C(O)NHCH2CH2NHC(O)Fe(η5-C5H4)(η5-C5H5))(CH2CH2N(CH2CH2C(O)NHCH2CH2NHC(O)Fe(η5-C5H4)(η5-C5H5))2)2 (G2Fc) was used as a functional moiety to immobilize the antibody on the surface of the electrode. A sandwich immunosensor of the type IgG/Bovine serum albumin (BSA)/anti-IgG/G2Fc/glassy carbon electrode (GCE) was fabricated. The electrochemical properties of G2Fc were thoroughly studied in aqueous and non-aqueous electrolytes with varying scan rates. The incubation time was optimized for better analytical performance of the immunosensor. It is found that the developed amperometric immunosensor is sensitive to a concentration of IgG as low as 2 ng mL−1
Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
4

Zaccarin, Mattia. "Setting up of an innovative procedure for redox proteomics: and its application for definition of the redox status of cells with high metastatic potential." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423382.

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BACKGROUND: The cysteine (Cys) proteome includes 214.000 Cys with thiol and other forms. Of these, only a relatively small subset functions in cell signalling. Redox-active Cys are more susceptible to oxidation, and their oxidized form is more susceptible to reduction. Specific proteomic techniques are required to identify these modifications and to study their regulation in different cell processes that are collectively known as redox proteomics. Thus, it is of interest to be able to identify both the proteins and the cysteine residues affected, and to quantify the extent of the modification involved.The quantification of differences between two or more physiological states of a biological system is among the most challenging technical tasks in proteomics: liquid chromatography coupled to mass spectrometry (LC-MS) based quantification methods have gained increasing robustness and reliability over the past five years. Many authors still share a view of redox signalling in which the fate of the cell is dependent mainly on the intensity and duration of pro-oxidant stimulus: here we sustain the involvement of an equilibrium encompassing the action of both nucleophiles and electrophiles at the same time. AIM: The dual aim of my PhD work has been both to develop suitable methodology to identify and quantify redox-active proteins in complex samples and to apply it to the study of a cellular model of breast cancer (MCF10A) engineered to reproduce malignancy. METHODS: In order to pursue this aim, I took advantage of an approach integrating differential chemical sample labelling (non-isotopic) with Cys reactive probes (NEM, IAM, HPDP) and chromatographic purification of redox-sensitive proteins, with subsequent LC-MS/MS analysis and computational data handling for OpenMS-based label-free quantification. All the steps of this methodology have been developed and validated in close collaboration with experts from both the biochemistry and bioinformatics field. RESULTS: We obtained an efficient cost-effective and isotopes-free methodology to characterize the redoxome in complex protein samples. Application of our quantification protocol to benchmark dataset leads to 100% correct estimates of under/over expression of the protein moiety. Application of the methodology to the breast cancer cellular model lead to identification of more than 300 proteins and allowed us to group-up unchanged and differentially oxidized redox-sensitive proteins in the more malignant cells in respect to their less aggressive counterpart. CONCLUSION: Despite the commonly accepted association between cancer and higher oxidative-stress, this study links higher breast cancer cells malignancy to a finely tuned dynamic equilibrium in which selected protein targets are oxidized in the context of a more reduced cell environment. Preliminary results point at the enzyme G6PDH as a crucial regulator of this redox process.
STATO DELL’ARTE: Il proteoma include 214.000 cisteine in forma di gruppi tiolici liberi od altra forma. Di queste, solamente un insieme relativamente ristretto ha un ruolo nella mediazione di segnali cellulari. Tali cisteine, attive dal punto di vista dell’ossido-riduzione, sono più sensibili all’ossidazione e la loro forma ossidata è più facilmente riducibile. Sono dunque necessarie specifiche tecniche di proteomica, globalmente indicate con il termine proteomica delle ossido-riduzioni, per identificare tali modifiche e studiarne la regolazione in diversi processi cellulari. Risulta quindi determinante la capacità di identificare sia le proteine che i residui coinvolti e di quantificarne il grado di modificazione. E proprio la quantificazione delle differenze tra due o più stati di un sistema biologico, si colloca tra gli obiettivi tecnicamente più sfidanti della proteomica: nel corso degli ultimi cinque anni, tecniche basate sulla spettrometria di massa associata a cromatografia in fase liquida hanno progressivamente guadagnato affidabilità e robustezza. Molti autori condividono tuttora una visione delle ossido-riduzioni nella mediazione del segnale in cui il destino cellulare dipende principalmente dall’intensità e dalla durata degli stimoli ossidanti: nel presente lavoro si vuole invece sostenere il coinvolgimento di un equilibrio che includa l’azione concomitante sia di specie nucleofile sia di specie elettrofile. OBIETTIVO: Il duplice obiettivo del mio lavoro di Dottorato è stato sia lo sviluppo di una metodologia idonea all’identificazione e quantificazione di proteine, attive dal punto di vista delle ossido-riduzioni, in campioni complessi, sia l’applicazione di tale metodologia allo studio di un sistema cellulare ingegnerizzato di carcinoma mammario (MCF10A) caratterizzato da diversi gradi di malignità. METODI: Al fine di perseguire tale obiettivo ho tratto vantaggio da un approccio che integra la marcatura chimica differenziale (non-isotopica) per mezzo di sonde reattive con i residui di cisteina (NEM, IAM, HPDP) e la purificazione cromatografica delle proteine attive dal punto di vista ossido-riduttivo, alla successiva analisi LC-MS/MS ed elaborazione informatizzata dei dati mediante OpenMS per una quantificazione label-free. Tutti i passaggi di tale metodologia sono quindi stati messi a punto e validati in stretta collaborazione con esperti biochimici e bioinformatici. RISULTATI: E’ stato sviluppato un metodo efficiente ed economico, non basato sull’utilizzo di marcatori isotopici, per la caratterizzazione delle proteine attive dal punto di vista ossido-riduttivo in campioni proteici complessi. L’applicazione del protocollo di quantificazione ad un campione test ha dato il 100% di stime corrette di sovra/sotto-espressione della miscela proteica. L’applicazione del metodo allo studio del modello cellulare di carcinoma mammario ha portato all’identificazione di più di 300 proteine ed ha permesso il raggruppamento di quelle sensibili dal punto di vista ossido-riduttivo in gruppi non differenziali e sovra- o sotto-ossidate nelle cellule più maligne rispetto alla loro controparte meno aggressiva. CONCLUSIONI: Nonostante sia comunemente riconosciuta l’associazione tra fenomeni neoplastici ed uno stress ossidativo, questo studio collega la maggiore malignità di un modello cellulare di carcinoma mammario ad un complesso equilibrio ossido-riduttivo. In questo contesto, specifici bersagli proteici sono ossidati mentre viene mantenuto un ambiente cellulare complessivamente ridotto. Risultati preliminari evidenziano poi l’enzima G6PDH come possibile elemento chiave nella regolazione di tale equilibrio.
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Kim, Sangkyung. "Redox cycling for an in-situ enzyme labeled immunoassay on interdigitated array electrodes." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-08192004-105039/unrestricted/kim%5Fsangkyung%5F200412%5Fphd.pdf.

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Thesis (Ph. D.)--Biomedical Engineering, Georgia Institute of Technology, 2005.
Hesketh, Peter, Committee Chair ; Edmondson, Dale, Committee Member ; Frazier, Albert, Committee Member ; Hunt, William, Committee Member ; Janata, Jiri, Committee Member. Includes bibliographical references.
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Hou, Jue. "Characterizing Breast Cancer Invasive Potential Using Combined Label-Free Multiphoton Metabolic Imaging of Cellular Lipids and Redox State." Thesis, University of California, Irvine, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10288401.

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Aerobic glycolysis (Warburg effect) is accompanied by significant alterations in cellular redox state and constitutes one of the hallmarks of cancer cell metabolism. Label-free multi-photon microscopy (MPM) methods based on two-photon excited fluorescence (TPEF) have been used extensively to form high-resolution images of redox state in cells and tissues based on intrinsic NADH and FAD+ fluorescence. However, changes in cellular redox alone are insufficient to fully characterize cancer metabolism and predict invasive potential. We demonstrate that label-free MPM measurements of TPEF-derived redox state (optical redox ratio, ORR = FAD+/(FAD + NADH)) combined with coherent Raman imaging of lipid formation can be used to quantitatively characterize cancer cells and their relative invasive potential. In addition, we confirm, using coherent Raman and deuterium labeling methods, that glucose is a significant source for the cellular synthesis of lipid biomass in glycolytic breast cancer cells. Live cell metabolism was imaged in 3D models of primary mammary epithelial cells (PME) and 2 cancer cell lines, T47D and MDA-MB-231. While we observed overlap in the distribution of the optical redox ratio between these different cell lines, the combination of ORR and lipid volume fraction derived from coherent Raman signals provided complementary independent measures and clear separation. Furthermore, we observed an increase in both lipid synthesis and consumption rates in E2-treated T47D cancer cells cultured in deuterated glucose by tracking the formation and disappearance of deuterated lipids. These results suggest that due to the relatively wide range of ORR values that reflect the natural diversity of breast cancer cellular redox states, the addition of lipid signatures obtained from coherent Raman imaging can improve our ability to characterize and understand key metabolic features that are hallmarks of the disease.

Book chapters on the topic "Redox labels":

1

Golubev, V. A., Yu N. Kozlov, A. N. Petrov, and A. P. Purmal. "Catalysis of Redox Processes by Nitroxyl Radicals." In Bioactive Spin Labels, 119–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-48724-8_4.

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Likhtenshtein, Gertz I. "Physical Label Techniques." In Chemical Physics of Redox Metalloenzyme Catalysis, 45–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73100-6_3.

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Allen, John F., Paul N. Davies, Jens Forsberg, Gunilla Håkansson, and Anna Tullberg. "Acid-Labile, Histidine Phosphoproteins in Chloroplasts and Mitochondria: Possible Candidates for Redox Sensor Kinases." In Photosynthesis: from Light to Biosphere, 2639–42. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0173-5_622.

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Zanello, Piero. "STEREOCHEMICAL ASPECTS OF THE REDOX PROPENSITY OF HOMOMETAL CARBONYL CLUSTERS." In Chains, Clusters, Inclusion Compounds, Paramagnetic Labels, and Organic Rings, 161–408. Elsevier, 1994. http://dx.doi.org/10.1016/b978-0-444-81581-1.50006-1.

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Olejniczak, Agnieszka B., and Zbigniew J. Leśnikowski. "Boron Clusters as Redox Labels for Nucleosides and Nucleic Acids." In Handbook of Boron Science, 1–13. WORLD SCIENTIFIC (EUROPE), 2018. http://dx.doi.org/10.1142/9781786344670_0001.

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Robertson, Jeremy. "Redox deprotection." In Protecting Group Chemistry. Oxford University Press, 2000. http://dx.doi.org/10.1093/hesc/9780198502753.003.0005.

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This chapter focuses on redox deprotection. Oxidation-labile protecting groups offer a means of releasing functional groups under essentially neutral conditions which is useful when hydrolytic deprotection is not tolerated and silyl protecting groups are unsuitable. In particular, a CH2 group that links a functional group to an electron-rich aromatic ring is prone to oxidation giving a hemiacetal, which is unstable with respect to aldehyde formation, and release of the functional group. Some oxidising agents activate the CH2 towards nucleophilic attack by water in a process equivalent overall to abstraction of hydride ion. The chapter then looks at internal redox processes, including free-radical deprotection, protecting group interchange, and photochemical deprotection. It also considers reductive methods, including hydrogenolysis.
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Junkefer, Clifford, David Rhouck, B. Mark Britt, Tobin R. Sosnick, and John L. Hanners. "[17] Biogenesis of pyrroloquinoline quinone from 3C-labeled tyrosine." In Redox-active amino acids in biology, 227–35. Elsevier, 1995. http://dx.doi.org/10.1016/0076-6879(95)58049-2.

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Duca, Gheorghe, and Mikhail Yu Gorbachev. "Theories of electron and proton transfer and the need for their development." In Redox Processes with Electron and Proton Transfer, 30–60. Moldova State University, 2023. http://dx.doi.org/10.59295/prtep2023_03.

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This chapter provides a detailed overview of the evolution of electron and proton transfer research. Significant contributions include Libby's 1952 model, for which R.A. Marcus, provided a solution to the problem of energy conservation in this model by proposing that energy levels can adjust through environmental fluctuations. Henry Taube, made essential contributions highlighting the differences between rigid and labile transition metal complexes in redox reactions. The mechanism of the synchronous transfer of an electron and a proton is also addressed, a consequence of the Frank-Condon principle, which limits the number of electrons transferred simultaneously. The existence of synchronous two-electron transfer processes and their importance in enzymatic reactions are mentioned.Special emphasis is placed on compounds with unusual reactivity and the possibility of synchronous multi-electron transfers. Supramolecular systems and the different applicability of theoretical models in this field are also highlighted. The chapter mentions international nanomachine competitions, where supramolecular systems are used in competitive events, thus emphasizing the practical relevance and continuous innovation in this field of study.
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Bianchi, Thomas S., and Elizabeth A. Canuel. "Chemical Biomarker Applications to Ecology and Paleoecology." In Chemical Biomarkers in Aquatic Ecosystems. Princeton University Press, 2011. http://dx.doi.org/10.23943/princeton/9780691134147.003.0002.

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This chapter provides a brief historical account of the success and limitations of using chemical biomarkers in aquatic ecosystems. It also introduces the general concepts of chemical biomarkers as they relate to global biogeochemical cycling. The application of chemical biomarkers in modern and/or ancient ecosystems is largely a function of the inherent structure and stability of the molecule, as well as the physicochemical environment of the system wherein it exists. In some cases, redox changes in sediments have allowed for greater preservation of biomarker compounds; in well-defined laminated sediments; for example, a strong case can be made for paleo-reconstruction of past organic matter composition sources. However, many of the labile chemical biomarkers may be lost or transformed within minutes to hours of being released from the cell from processes such as bacterial and/or metazoan grazing, cell lysis, and photochemical breakdown. The role of trophic effects versus large-scale physiochemical gradients in preserving or destroying the integrity of chemical biomarkers varies greatly across different ecosystems. These effects are discussed as they relate to aquatic systems such as lakes, estuaries, and oceans.
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Murali Manoj, Kelath, Nikolai Bazhin, Abhinav Parashar, Afsal Manekkathodi, and Yanyou Wu. "Comprehensive Analyses of the Enhancement of Oxygenesis in Photosynthesis by Bicarbonate and Effects of Diverse Additives: Z-scheme Explanation Versus Murburn Model." In Physiology. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106996.

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The Z-scheme electron transport chain (ETC) explanation for photosynthesis starts with the serial/sequential transfer of electrons sourced from water molecules bound at Photosystem II via a deterministic array of redox centers (of various stationary/mobile proteins), before \"sinking\" via the reduction of NADP+ bound at flavin-enzyme reductase. Several research groups’ finding that additives (like bicarbonate) enhance the light reaction had divided the research community because it violated the Z-scheme. The untenable aspects of the Z-scheme perception were demonstrated earlier and a murburn bioenergetics (a stochastic/parallel paradigm of ion-radical equilibriums) model was proposed to explain photophosphorylation and Emerson effect. Herein, we further support the murburn model with accurate thermodynamic calculations, which show that the cost of one-electron abstraction from bicarbonate [491 kJ/mol] is lower than water [527 kJ/mol]. Further, copious thioredoxin enables the capture of photoactivated electrons in milieu, which aid in the reduction of nicotinamide nucleotides. The diffusible reactive species (DRS) generated in milieu sponsor phosphorylations and oxygenic reactions. With structural analysis of Photosystems and interacting molecules, we chart out the equations of reactions that explain the loss of labeled O-atom traces in delocalized oxygenesis. Thus, this essay discredits the Z-scheme and explains key outstanding observations in the field.

Conference papers on the topic "Redox labels":

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Rodriguez, Marcos R., Malavika Nidhi, Divya M. Gollapalli, and Kyle P. Quinn. "Quantifying the Interaction between Age and Diabetes on Skin Wound Metabolism Using In Vivo Multiphoton Microscopy." In Clinical and Translational Biophotonics. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/translational.2024.ts3b.4.

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Through longitudinal, in vivo label-free multiphoton microscopy, an optical redox ratio of FAD/(NADH+FAD) autofluorescence demonstrated how diabetes and advanced age affect skin metabolism during the stages of wound healing.
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Gillette, Amani, Shirsa Udgata, Lexie Schmitz, Dustin Deming, and Melissa C. Skala. "Wide-field optical redox imaging with leading-edge detection for assessment of patient-derived cancer organoids (Conference Presentation)." In Label-free Biomedical Imaging and Sensing (LBIS) 2023, edited by Natan T. Shaked and Oliver Hayden. SPIE, 2023. http://dx.doi.org/10.1117/12.2650100.

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Chen, Cheng-Chuan, Wan-Shao Tsai, and Pei-Kuen Wei. "Aqueous mercuric ions detection using electrochemical surface plasmon resonance in capped gold nanowire arrays." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.5p_a410_10.

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Mercuric ion, inorganic metal ion, found in three oxidation state in nature, including elemental mercury (Hg0), mercurous ion (Hg+), and mercuric ion (Hg2+). These three forms possess hazardous environmental contaminant and are extremely toxic metal materials to damage mammalian organs.[1] This work demonstrates a label-free technique for Hg2+ ions detection using capped gold nanowire arrays based sensors[2] combined with the electrochemical surface plasmon resonance method. The three-electrode electrochemical analysis (Fig. 1) and optical transmission measurement were employed to characterize the potential-current responses and the resonant peak signals were for the investigation of metal ion electrodeposition (Fig. 2). The nanostructured EC-SPR sensors were used to characterize the eletrochemical behaviors of K3Fe(CN)6/K2Fe(CN)6 redox couple and evaluate the wavelength sensitivity (480.3 nm RIU-1) with a FOM of 40.0 RIU-1 and the intensity sensitivity (1819.9 %) in the glycerol-water solutions. Fig. shows the detection limit of 1 pM Hg2+ can be obtained by the chronoamperomet- ric-spectrum analysis. The developed capped gold nanowire arrays based sensors present Hg2+ ion selectivity over the wavelength shifts of the interfering ions including Ca2+, Co2+, Ni2+, Na+, Cu2+, Pb2+, and Mn2+ ions. The developed capped gold nanoslit arrays based sensors present Hg2+ ion selectivity over the wavelength shifts of the interfering ions including Ca2+, Co2+, Ni2+, Na+, Cu2+, Pb2+, and Mn2+ ions. The proposed flexible capped gold nanowire arrays based sensor is applicable to be an EC-SPR label-free platform and enabled a rapid, sensitive and selective sensing method for aqueous Hg2+ detection. The application of biomolecule analysis can be further evaluation in the future. applicable to be an EC-SPR label-free platform and enabled a rapid, sensitive and selective sensing method for aqueous Hg2+ detection. The application of biomolecule analysis can be further evaluation in the future. Fig.1.Schematic representation of electrochemical surface plasmon resonance configuration set-up for mercury ions detection. Fig. 2 Redox current curves during the first cyclic voltammetry scan and the simultaneously measured surface plasmon resonance intensity. Fig. 3. The wavelength shifts and the intensity changes of gold nanowire arrays against Hg2+concentrations between 100|rM and 100nM. The inset shows the reduction reaction currents of amperometric responses at various Hg2+ concentrations.
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Halid, Nurul Izni Abdullah, Siti Aishah Hasbullah, Haslina Ahmad, Lee Yook Heng, Nurul Huda Abd Karim, and Siti Norain Harun. "Electrochemical DNA biosensor for detection of porcine oligonucleotides using ruthenium(II) complex as intercalator label redox." In THE 2014 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2014 Postgraduate Colloquium. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4895214.

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Doi, Hideo, Tomoko Horio, Young-Joon Choi, Kazuhiro Takahashi, Toshihiko Noda, and Kazuaki Sawada. "Redox-Type Label-Free ATP Image Sensor for Highly Sensitive in Vitro Imaging of Extracellular ATP." In 2021 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers). IEEE, 2021. http://dx.doi.org/10.1109/transducers50396.2021.9495500.

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Cheng, Chi Qin, Kok Sheik Wong, and Lay Ki Soon. "l2Match: Optimization Techniques on Subgraph Matching Algorithm Using Label Pair, Neighboring Label Index, and Jump-Redo Method." In 2024 International Conference on Electronics, Information, and Communication (ICEIC). IEEE, 2024. http://dx.doi.org/10.1109/iceic61013.2024.10457108.

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Bacciu, Davide, and Marco Podda. "Graphgen-redux: a Fast and Lightweight Recurrent Model for labeled Graph Generation." In 2021 International Joint Conference on Neural Networks (IJCNN). IEEE, 2021. http://dx.doi.org/10.1109/ijcnn52387.2021.9533743.

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Doi, Hideo, Tomoko Horio, Eiji Shigetomi, Youichi Shinozaki, You-Na Lee, Tatsuya Yoshimi, Tatsuya Iwata, et al. "Label-Free Real-Time Imaging of Extracellular Lactate From a Hippocampal Slice Based on Charge-Transfer-Type Potentiometric Redox Sensor Arrays." In 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII). IEEE, 2019. http://dx.doi.org/10.1109/transducers.2019.8808447.

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To the bibliography