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Tang M, Zhang L, Song X, Zhao L. Developing an Electrochemically Reversible Switch for Modulating the Optical Signal of Gold Nanoparticles. Molecules 2023; 28:6233. [PMID: 37687062 PMCID: PMC10488341 DOI: 10.3390/molecules28176233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 08/17/2023] [Accepted: 08/23/2023] [Indexed: 09/10/2023] Open
Abstract
Gold nanoparticles (AuNPs) possess remarkable optical properties and electrical conductivity, making them highly relevant in various fields such as medical diagnoses, biological imaging, and electronic sensors. However, the existing methods for modulating the optical properties of AuNPs are often under limitations such as a high cost, the complexity of detection, a narrow range of application settings, and irreversibility. In this study, we propose a novel approach to address these challenges by constructing a reversible electrochemical switch. The switch (ITO-OMAD) involves covalently linking nitroxide radicals and AuNPs (AuNPs-NO•), followed by tethering this nanocomposite to a siloxane-derived indium tin oxide (ITO) electrode. By simply electrochemically oxidizing/reducing the nitroxide units, one is able to reversibly modulate the optical properties of AuNPs at will. The surface morphology and structure of the as-prepared ITO-OMAD electrode were characterized through scanning electron microscopy (SEM) and cyclic voltammetry (CV). SEM imaging confirmed the successful anchoring of AuNPs on the ITO electrode. Electrochemical tests performed in the three-electrode system demonstrated that the local surface plasmon resonance (LSPR) of AuNPs can be reversibly regulated by alternatively imposing ± 0.5V (vs. Ag/AgCl) to the modified electrode. The development of this electrochemical switch presents a novel approach to effectively control the optical properties of AuNPs. The further exploration and utilization of this reversible electrochemical switch could significantly enhance the versatility and practicality of AuNPs in numerous applications.
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Affiliation(s)
| | | | | | - Long Zhao
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; (M.T.); (L.Z.); (X.S.)
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Tretyakov EV, Ovcharenko VI, Terent'ev AO, Krylov IB, Magdesieva TV, Mazhukin DG, Gritsan NP. Conjugated nitroxide radicals. RUSSIAN CHEMICAL REVIEWS 2022. [DOI: 10.1070/rcr5025] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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3
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Pullulan Based Bioconjugates for Ocular Dexamethasone Delivery. Pharmaceutics 2021; 13:pharmaceutics13060791. [PMID: 34073275 PMCID: PMC8227697 DOI: 10.3390/pharmaceutics13060791] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 05/16/2021] [Accepted: 05/19/2021] [Indexed: 11/16/2022] Open
Abstract
Posterior segment eye diseases are mostly related to retinal pathologies that require pharmacological treatments by invasive intravitreal injections. Reduction of frequent intravitreal administrations may be accomplished with delivery systems that provide sustained drug release. Pullulan-dexamethasone conjugates were developed to achieve prolonged intravitreal drug release. Accordingly, dexamethasone was conjugated to ~67 kDa pullulan through hydrazone bond, which was previously found to be slowly cleavable in the vitreous. Dynamic light scattering and transmission electron microscopy showed that the pullulan-dexamethasone containing 1:20 drug/glucose unit molar ratio (10% w/w dexamethasone) self-assembled into nanoparticles of 461 ± 30 nm and 402 ± 66 nm, respectively. The particles were fairly stable over 6 weeks in physiological buffer at 4, 25 and 37 °C, while in homogenized vitreous at 37 °C, the colloidal assemblies underwent size increase over time. The drug was released slowly in the vitreous and rapidly at pH 5.0 mimicking lysosomal conditions: 50% of the drug was released in about 2 weeks in the vitreous, and in 2 days at pH 5.0. In vitro studies with retinal pigment epithelial cell line (ARPE-19) showed no toxicity of the conjugates in the cells. Flow cytometry and confocal microscopy showed cellular association of the nanoparticles and intracellular endosomal localization. Overall, pullulan conjugates showed interesting features that may enable their successful use in intravitreal drug delivery.
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Barton J, Gulka M, Tarabek J, Mindarava Y, Wang Z, Schimer J, Raabova H, Bednar J, Plenio MB, Jelezko F, Nesladek M, Cigler P. Nanoscale Dynamic Readout of a Chemical Redox Process Using Radicals Coupled with Nitrogen-Vacancy Centers in Nanodiamonds. ACS NANO 2020; 14:12938-12950. [PMID: 32790348 DOI: 10.1021/acsnano.0c04010] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Biocompatible nanoscale probes for sensitive detection of paramagnetic species and molecules associated with their (bio)chemical transformations would provide a desirable tool for a better understanding of cellular redox processes. Here, we describe an analytical tool based on quantum sensing techniques. We magnetically coupled negatively charged nitrogen-vacancy (NV) centers in nanodiamonds (NDs) with nitroxide radicals present in a bioinert polymer coating of the NDs. We demonstrated that the T1 spin relaxation time of the NV centers is very sensitive to the number of nitroxide radicals, with a resolution down to ∼10 spins per ND (detection of approximately 10-23 mol in a localized volume). The detection is based on T1 shortening upon the radical attachment, and we propose a theoretical model describing this phenomenon. We further show that this colloidally stable, water-soluble system can be used dynamically for spatiotemporal readout of a redox chemical process (oxidation of ascorbic acid) occurring near the ND surface in an aqueous environment under ambient conditions.
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Affiliation(s)
- Jan Barton
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo namesti 2, 166 10 Prague, Czechia
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 40 Prague 2, Czechia
| | - Michal Gulka
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1, B-3590 Diepenbeek, Belgium
- Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, Sitna sq. 3105, 27201 Kladno, Czechia
- IMOMEC Division, IMEC, Wetenschapspark 1, B-3590 Diepenbeek, Belgium
| | - Jan Tarabek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo namesti 2, 166 10 Prague, Czechia
| | - Yuliya Mindarava
- Institute for Quantum Optics and IQST, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
| | - Zhenyu Wang
- Institute of Theoretical Physics and IQST, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
| | - Jiri Schimer
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo namesti 2, 166 10 Prague, Czechia
| | - Helena Raabova
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo namesti 2, 166 10 Prague, Czechia
| | - Jan Bednar
- Institute for Advanced Biosciences, UMR 5309, Allée des Alpes, 38700 la Tronche, France
- Institute of Biology and Medical Genetics, First Faculty of Medicine, Charles University, Albertov 4, 128 00 Prague, Czechia
| | - Martin B Plenio
- Institute of Theoretical Physics and IQST, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
| | - Fedor Jelezko
- Institute for Quantum Optics and IQST, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
| | - Milos Nesladek
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1, B-3590 Diepenbeek, Belgium
- Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, Sitna sq. 3105, 27201 Kladno, Czechia
- IMOMEC Division, IMEC, Wetenschapspark 1, B-3590 Diepenbeek, Belgium
| | - Petr Cigler
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo namesti 2, 166 10 Prague, Czechia
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5
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Schultz-Simonton W, Skelly P, Chakraborty I, Mascharak P, Braslau R. Synthesis, Structure, and Fluorescence Behavior of Profluorescent 8-Amino BODIPY Nitroxides. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Wiley Schultz-Simonton
- Chemistry and Biochemistry; University of California Santa Cruz; 1156 High St. 95064 Santa Cruz CA USA
| | - Patrick Skelly
- Chemistry and Biochemistry; University of California Santa Cruz; 1156 High St. 95064 Santa Cruz CA USA
| | - Indranil Chakraborty
- Chemistry and Biochemistry; University of California Santa Cruz; 1156 High St. 95064 Santa Cruz CA USA
| | - Pradip Mascharak
- Chemistry and Biochemistry; University of California Santa Cruz; 1156 High St. 95064 Santa Cruz CA USA
| | - Rebecca Braslau
- Chemistry and Biochemistry; University of California Santa Cruz; 1156 High St. 95064 Santa Cruz CA USA
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Coman AG, Stavarache C, Paun A, Popescu CC, Hădade ND, Ionita P, Matache M. A novel profluorescent paramagnetic diaza-crown ether: synthesis, characterization and alkaline metal-ion complexation. RSC Adv 2019; 9:6078-6083. [PMID: 35517289 PMCID: PMC9060903 DOI: 10.1039/c8ra09828j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 02/14/2019] [Indexed: 12/20/2022] Open
Abstract
Starting from Kryptofix 22 two different branches were covalently attached through the nitrogen atoms, one containing a fluorescent moiety and the other the stable free radical TEMPO. The novel derivative exhibits fluorescence and paramagnetic properties, while the diaza-crown part ensures the affinity for alkaline metal-ions. Starting from Kryptofix 22 two different branches were covalently attached through the nitrogen atoms, one containing a fluorescent moiety and the other the stable free radical TEMPO.![]()
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Affiliation(s)
- Anca G Coman
- University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, Research Centre of Applied Organic Chemistry 90-92 Panduri Street RO-050663 Bucharest Romania
| | - Cristina Stavarache
- Institute of Organic Chemistry "C.D. Nenitescu" of the Romanian Academy 202B Spl. Independentei 060023 Bucharest Romania
| | - Anca Paun
- University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, Research Centre of Applied Organic Chemistry 90-92 Panduri Street RO-050663 Bucharest Romania
| | - Codruţa C Popescu
- University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, Research Centre of Applied Organic Chemistry 90-92 Panduri Street RO-050663 Bucharest Romania
| | - Niculina D Hădade
- Faculty of Chemistry and Chemical Engineering, Supramolecular Organic and Organometallic Chemistry Centre, "Babes-Bolyai" University 11 Arany Janos Str. RO-400028-Cluj-Napoca Romania
| | - Petre Ionita
- University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, Research Centre of Applied Organic Chemistry 90-92 Panduri Street RO-050663 Bucharest Romania .,Institute of Physical Chemistry "Ilie Murgulescu" 202 Splaiul Independentei Bucharest Romania
| | - Mihaela Matache
- University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, Research Centre of Applied Organic Chemistry 90-92 Panduri Street RO-050663 Bucharest Romania
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Mocanu S, Matei I, Leonties A, Tecuceanu V, Hanganu A, Minea Z, Stancu A, Popescu EI, Ionita G. New flexible molecular probes bearing dansyl and TEMPO moieties for host–guest interactions in solution and gels. NEW J CHEM 2019. [DOI: 10.1039/c9nj01554j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Host–guest interactions in functionalised alginate gels are evidenced by EPR and fluorescence spectra.
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Affiliation(s)
- Sorin Mocanu
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Iulia Matei
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Anca Leonties
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | | | - Anamaria Hanganu
- Organic Chemistry Centre of the Romanian Academy
- 78100 Bucharest
- Romania
- Department of Organic Chemistry, Biochemistry and Catalysis
- University of Bucharest
| | - Zamfirica Minea
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Alina Stancu
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Elena Irina Popescu
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Gabriela Ionita
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
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