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Welden R, Das A, Krause S, Schöning MJ, Wagner PH, Wagner T. Actively Driven Light-Addressable Sensor/Actuator System for Automated pH Control for the Integration in Lab-On-A-Chip (LoC) Platforms. ACS Sens 2024; 9:1533-1544. [PMID: 38445576 DOI: 10.1021/acssensors.3c02712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
The miniaturization of microfluidic systems usually comes at the cost of more difficult integration of sensors and actuators inside the channel. As an alternative, this work demonstrates the embedding of semiconductor-based sensor and actuator technologies that can be spatially and temporally controlled from outside the channel using light. The first element is a light-addressable potentiometric sensor, consisting of an Al/Si/SiO2/Si3N4 structure, that can measure pH changes at the Si3N4/electrolyte interface. The pH value is a crucial factor in biological and chemical systems, and besides measuring, it is often important to bring the system out of equilibrium or to adjust and control precisely the surrounding medium. This can be done photoelectrocatalytically by utilizing light-addressable electrodes. These consist of a glass/SnO2:F/TiO2 structure, whereby direct charge transfer between the TiO2 and the electrolyte leads to a pH change upon irradiation. To complement the advantages of both, we integrated a light-addressable sensor with a pH sensitivity of 41.5 mV·pH-1 and a light-addressable electrode into a microfluidic setup. Here, we demonstrated a simultaneous operation with the ability to generate and record pH gradients inside a channel under static and dynamic flow conditions. The results show that dependent on the light-addressable electrode (LAE)-illumination conditions, pH changes up to ΔpH of 2.75 and of 3.52 under static and dynamic conditions, respectively, were spatially monitored by the light-addressable potentiometric sensor. After flushing with fresh buffer solution, the pH returned to its initial value. Depending on the LAE illumination, pH gradients with a maximum pH change of ΔpH of 1.42 were tailored perpendicular to the flow direction. In a final experiment, synchronous LAE illumination led to a stepwise increase in the pH inside the channel.
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Affiliation(s)
- Rene Welden
- Institute of Nano- and Biotechnologies (INB), Aachen University of Applied Sciences, Heinrich-Mußmann-Str. 1, Jülich 52428, Germany
- Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, Leuven 3001, Belgium
| | - Anirban Das
- School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, U.K
| | - Steffi Krause
- School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, U.K
| | - Michael J Schöning
- Institute of Nano- and Biotechnologies (INB), Aachen University of Applied Sciences, Heinrich-Mußmann-Str. 1, Jülich 52428, Germany
- Institute of Biological Information Processing (IBI-3), Forschungszentrum Jülich GmbH, Jülich 52428, Germany
| | - Patrick H Wagner
- Institute of Nano- and Biotechnologies (INB), Aachen University of Applied Sciences, Heinrich-Mußmann-Str. 1, Jülich 52428, Germany
- Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, Leuven 3001, Belgium
| | - Torsten Wagner
- Institute of Nano- and Biotechnologies (INB), Aachen University of Applied Sciences, Heinrich-Mußmann-Str. 1, Jülich 52428, Germany
- Institute of Biological Information Processing (IBI-3), Forschungszentrum Jülich GmbH, Jülich 52428, Germany
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2
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Ryzhkov NV, Nikolaev KG, Ivanov AS, Skorb EV. Infochemistry and the Future of Chemical Information Processing. Annu Rev Chem Biomol Eng 2021; 12:63-95. [PMID: 33909470 DOI: 10.1146/annurev-chembioeng-122120-023514] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Nowadays, information processing is based on semiconductor (e.g., silicon) devices. Unfortunately, the performance of such devices has natural limitations owing to the physics of semiconductors. Therefore, the problem of finding new strategies for storing and processing an ever-increasing amount of diverse data is very urgent. To solve this problem, scientists have found inspiration in nature, because living organisms have developed uniquely productive and efficient mechanisms for processing and storing information. We address several biological aspects of information and artificial models mimicking corresponding bioprocesses. For instance, we review the formation of synchronization patterns and the emergence of order out of chaos in model chemical systems. We also consider molecular logic and ion fluxes as information carriers. Finally, we consider recent progress in infochemistry, a new direction at the interface of chemistry, biology, and computer science, considering unconventional methods of information processing.
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Affiliation(s)
- Nikolay V Ryzhkov
- Infochemistry Scientific Center of ITMO University, 191002 Saint Petersburg, Russia; , , ,
| | - Konstantin G Nikolaev
- Infochemistry Scientific Center of ITMO University, 191002 Saint Petersburg, Russia; , , ,
| | - Artemii S Ivanov
- Infochemistry Scientific Center of ITMO University, 191002 Saint Petersburg, Russia; , , ,
| | - Ekaterina V Skorb
- Infochemistry Scientific Center of ITMO University, 191002 Saint Petersburg, Russia; , , ,
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3
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Nanoparticles in Polyelectrolyte Multilayer Layer-by-Layer (LbL) Films and Capsules—Key Enabling Components of Hybrid Coatings. COATINGS 2020. [DOI: 10.3390/coatings10111131] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Originally regarded as auxiliary additives, nanoparticles have become important constituents of polyelectrolyte multilayers. They represent the key components to enhance mechanical properties, enable activation by laser light or ultrasound, construct anisotropic and multicompartment structures, and facilitate the development of novel sensors and movable particles. Here, we discuss an increasingly important role of inorganic nanoparticles in the layer-by-layer assembly—effectively leading to the construction of the so-called hybrid coatings. The principles of assembly are discussed together with the properties of nanoparticles and layer-by-layer polymeric assembly essential in building hybrid coatings. Applications and emerging trends in development of such novel materials are also identified.
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Welden R, Schöning MJ, Wagner PH, Wagner T. Light-Addressable Electrodes for Dynamic and Flexible Addressing of Biological Systems and Electrochemical Reactions. SENSORS 2020; 20:s20061680. [PMID: 32192226 PMCID: PMC7147159 DOI: 10.3390/s20061680] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 03/13/2020] [Accepted: 03/13/2020] [Indexed: 01/25/2023]
Abstract
In this review article, we are going to present an overview on possible applications of light-addressable electrodes (LAE) as actuator/manipulation devices besides classical electrode structures. For LAEs, the electrode material consists of a semiconductor. Illumination with a light source with the appropiate wavelength leads to the generation of electron-hole pairs which can be utilized for further photoelectrochemical reaction. Due to recent progress in light-projection technologies, highly dynamic and flexible illumination patterns can be generated, opening new possibilities for light-addressable electrodes. A short introduction on semiconductor–electrolyte interfaces with light stimulation is given together with electrode-design approaches. Towards applications, the stimulation of cells with different electrode materials and fabrication designs is explained, followed by analyte-manipulation strategies and spatially resolved photoelectrochemical deposition of different material types.
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Affiliation(s)
- Rene Welden
- Institute of Nano- and Biotechnologies (INB), Aachen University of Applied Sciences, Heinrich-Mußmann-Str. 1, 52428 Jülich, Germany; (R.W.); (M.J.S.)
- Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - Michael J. Schöning
- Institute of Nano- and Biotechnologies (INB), Aachen University of Applied Sciences, Heinrich-Mußmann-Str. 1, 52428 Jülich, Germany; (R.W.); (M.J.S.)
- Institute of Complex Systems (ICS-8), Research Center Jülich GmbH, 52428 Jülich, Germany
| | - Patrick H. Wagner
- Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - Torsten Wagner
- Institute of Nano- and Biotechnologies (INB), Aachen University of Applied Sciences, Heinrich-Mußmann-Str. 1, 52428 Jülich, Germany; (R.W.); (M.J.S.)
- Institute of Complex Systems (ICS-8), Research Center Jülich GmbH, 52428 Jülich, Germany
- Correspondence: ; Tel.: +49-241-6009-53766
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5
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Ryzhkov NV, Skorb EV. A platform for light-controlled formation of free-stranding lipid membranes. J R Soc Interface 2020. [DOI: 10.1098/rsif.2019.0740] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The engineering of artificial cells is one of the most significant scientific challenges. Thus, controlled fabrication and
in situ
monitoring of biomimetic nanoscale objects are among the central issues in current science and technology. Studies of transmembrane channels and cell mechanics often require the formation of lipid bilayers (LBs), their modification and their transfer to a particular place. We present here a novel approach for remotely controlled manipulation of LBs. Layer-by-layer deposition of polyethyleneimine and poly(sodium 4-styrenesulfonate) on a nanostructured TiO
2
photoanode was performed to obtain a surface with the desired net charge and to enhance photocatalytic performance. The LB was deposited on top of a multi-layer positive polymer cushion by the dispersion of negative vesicles. The separation distance between the electrostatically linked polyelectrolyte cushion and the LB can be adjusted by changing the environmental pH, as zwitter-ionic lipid molecules undergo pH-triggered charge-shifting. Protons were generated remotely by photoanodic water decomposition on the TiO
2
surface under 365 nm illumination. The resulting pH gradient was characterized by scanning vibrating electrode and scanning ion-selective electrode techniques. The light-induced reversible detachment of the LB from the polymer-cushioned photoactive substrate was found to correlate with suggested impedance models.
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6
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Ryzhkov NV, Yurova VY, Ulasevich SA, Skorb EV. Photoelectrochemical photocurrent switching effect on a pristine anodized Ti/TiO2 system as a platform for chemical logic devices. RSC Adv 2020; 10:12355-12359. [PMID: 35497609 PMCID: PMC9050699 DOI: 10.1039/d0ra00205d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 03/19/2020] [Indexed: 11/30/2022] Open
Abstract
We report here the effect of the photoelectrochemical photocurrent switching (PEPS) observed on highly-ordered pristine anodized Ti/TiO2 for the first time. At negative potential bias, blue irradiation gives cathodic photocurrent, whereas anodic photocurrent was observed for ultraviolet irradiation. We believe this phenomenon is due to the electron pathway provided by Ti3+ defect states. We report here the effect of the photoelectrochemical photocurrent switching (PEPS) observed on highly-ordered pristine anodized Ti/TiO2 for the first time.![]()
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Boyaciyan D, von Klitzing R. Stimuli-responsive polymer/metal composites: From fundamental research to self-regulating devices. Curr Opin Colloid Interface Sci 2019. [DOI: 10.1016/j.cocis.2019.10.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8
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Vogel YB, Gooding JJ, Ciampi S. Light-addressable electrochemistry at semiconductor electrodes: redox imaging, mask-free lithography and spatially resolved chemical and biological sensing. Chem Soc Rev 2019; 48:3723-3739. [PMID: 31143897 DOI: 10.1039/c8cs00762d] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Spatial confinement of electrochemical reactions at solid/liquid interfaces is a mature area of research, and a central theme from cell biology to analytical chemistry. Monitoring or manipulating the kinetics of a charge transfer reaction in 2D is generally achieved using scanning electrochemical microscopy or multielectrode arrays, techniques that rely on moving physical probes or on a network of electrical connections. This tutorial is introducing concepts and instruments to confine faradaic electrochemical reactions in 2D without resorting to the mechanical movement of a probe, and with the simple design of one semiconducting electrode, one electrical lead and a single-channel potentiostat. We provide a theoretical background of semiconductor electrochemistry, and describe the use of localised visible light stimuli on photoconductor/liquid and semiconductor/liquid interfaces to address electrical conductivity - hence chemical reactivity - only at one specific site defined by the experimentalist. This enables shifting of the tenet of one electrode/one wire towards one wire/many electrodes. We discuss the applications of this emerging platform in the context of surface chemistry patterning, redox imaging, chemical and biological sensing, generating chemical gradients, electrocatalysis, nanotechnology and cell biology.
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Affiliation(s)
- Yan B Vogel
- Department of Chemistry, Curtin Institute of Functional Molecules and Interfaces, Curtin University, Bentley, Western Australia 6102, Australia.
| | - J Justin Gooding
- School of Chemistry, The Australian Centre for NanoMedicine and the Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales, Sydney, New South Wales 2052, Australia.
| | - Simone Ciampi
- Department of Chemistry, Curtin Institute of Functional Molecules and Interfaces, Curtin University, Bentley, Western Australia 6102, Australia.
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Ryzhkov NV, Andreeva DV, Skorb EV. Coupling pH-Regulated Multilayers with Inorganic Surfaces for Bionic Devices and Infochemistry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:8543-8556. [PMID: 31018639 DOI: 10.1021/acs.langmuir.9b00633] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This article summarizes more than 10 years of cooperation with Prof. Helmuth Möhwald. Here we describe how the research moved from light-regulated feedback sustainable systems and control biodevices to the current focus on infochemistry in aqueous solution. An important advanced characteristic of such materials and devices is the pH concentration gradient in aqueous solution. A major part of the article focuses on the use of localized illumination for proton generation as a reliable, minimal-reagent-consuming, stable light-promoted proton pump. The in situ scanning vibration electrode technique (SVET) and scanning ion-selective electrode technique (SIET) are efficient for the spatiotemporal evolution of ions on the surface. pH-sensitive polyelectrolyte (PEs) multilayers with different PE architectures are composed with a feedback loop for bionic devices. We show here that pH-regulated PE multilayers can change their properties-film thickness and stiffness, permeability, hydrophilicity, and/or fluorescence-in response to light or electrochemical or biological processes instead of classical acid/base titration.
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Affiliation(s)
| | - Daria V Andreeva
- Centre for Advanced 2D Materials and Graphene Research Centre , National University of Singapore , 117546 Singapore
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10
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Ryzhkov NV, Nesterov P, Mamchik NA, Yurchenko SO, Skorb EV. Localization of Ion Concentration Gradients for Logic Operation. Front Chem 2019; 7:419. [PMID: 31245356 PMCID: PMC6562996 DOI: 10.3389/fchem.2019.00419] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 05/21/2019] [Indexed: 11/13/2022] Open
Abstract
Adjustment of the environmental acidity is a powerful method for fine-tuning the outcome of many chemical processes. Numerous strategies have been developed for the modification of pH in bulk as well as locally. Electrochemical and photochemical processes provide a powerful approach for on-demand generation of ion concentration gradients locally at solid-liquid interfaces. Spatially organized in individual way electrodes provide a particular pattern of proton distribution in solution. It opens perspectives to iontronics which is a bioinspired approach to signaling, information processing, and storing by spatial and temporal distribution of ions. We prove here that soft layers allow to control of ion mobility over the surface as well as processes of self-organization are closely related to change in entropy. In this work, we summarize the achievements and discuss perspectives of ion gradients in solution for information processing.
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Affiliation(s)
- Nikolay V Ryzhkov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, Saint Petersburg, Russia
| | - Pavel Nesterov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, Saint Petersburg, Russia
| | - Natalia A Mamchik
- Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, Saint Petersburg, Russia
| | | | - Ekaterina V Skorb
- Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, Saint Petersburg, Russia
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11
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Ryzhkov NV, Mamchik NA, Skorb EV. Electrochemical triggering of lipid bilayer lift-off oscillation at the electrode interface. J R Soc Interface 2019; 16:20180626. [PMID: 30958160 PMCID: PMC6364645 DOI: 10.1098/rsif.2018.0626] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 12/13/2018] [Indexed: 12/12/2022] Open
Abstract
In situ studies of transmembrane channels often require a model bioinspired artificial lipid bilayer (LB) decoupled from its underlaying support. Obtaining free-standing lipid membranes is still a challenge. In this study, we suggest an electrochemical approach for LB separation from its solid support via hydroquinone oxidation. Layer-by-layer deposition of polyethylenimine (PEI) and polystyrene sulfonate (PSS) on the gold electrode was performed to obtain a polymeric nanocushion of [PEI/PSS]3/PEI. The LB was deposited on top of an underlaying polymer support from the dispersion of small unilamellar vesicles due to their electrostatic attraction to the polymer support. Since lipid zwitterions demonstrate pH-dependent charge shifting, the separation distance between the polyelectrolyte support and LB can be adjusted by changing the environmental pH, leading to lipid molecules recharge. The proton generation associated with hydroquinone oxidation was studied using scanning vibrating electrode and scanning ion-selective electrode techniques. Electrochemical impedance spectroscopy is suggested to be a powerful instrument for the in situ observation of processes associated with the LB-solid support interface. Electrochemical spectroscopy highlighted the reversible disappearance of the LB impact on impedance in acidic conditions set by dilute acid addition as well as by electrochemical proton release on the gold electrode due to hydroquinone oxidation.
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Affiliation(s)
- Nikolay V. Ryzhkov
- ITMO University, 9 Lomonosova Street, St Petersburg 191002, Russian Federation
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12
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Sharsheeva A, Iglin VA, Nesterov PV, Kuchur OA, Garifullina E, Hey-Hawkins E, Ulasevich SA, Skorb EV, Vinogradov AV, Morozov MI. Light-controllable systems based on TiO2-ZIF-8 composites for targeted drug release: communicating with tumour cells. J Mater Chem B 2019; 7:6810-6821. [DOI: 10.1039/c9tb01377f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A model nanocomposite releases drug within 40 minutes under UV irradiation.
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Affiliation(s)
- Aziza Sharsheeva
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Vadim A. Iglin
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Pavel V. Nesterov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Oleg A. Kuchur
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Elizaveta Garifullina
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Evamarie Hey-Hawkins
- Faculty of Chemistry and Mineralogy
- Institute of Inorganic Chemistry
- Leipzig University
- D-04103 Leipzig
- Germany
| | - Sviatlana A. Ulasevich
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Ekaterina V. Skorb
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Alexandr V. Vinogradov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
| | - Maxim I. Morozov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies
- ITMO University
- St.Petersburg
- Russian Federation
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13
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Nikitina AA, Ulasevich SA, Kassirov IS, Bryushkova EA, Koshel EI, Skorb EV. Nanostructured Layer-by-Layer Polyelectrolyte Containers to Switch Biofilm Fluorescence. Bioconjug Chem 2018; 29:3793-3799. [PMID: 30350577 DOI: 10.1021/acs.bioconjchem.8b00648] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The development of stimuli-responsive nanocontainers is an issue of utmost importance for many applications such as targeted drug delivery, regulation of the cell and tissue behavior, making bacteria have useful functions and here converting light. The present work shows a new contribution to the design of polyelectrolyte (PE) containers based on surface modified mesoporous titania particles with deposited Ag nanoparticles to achieve chemical light upconversion via biofilms. The PE shell allows slowing down the kinetics of a release of loaded l-arabinose and switching the bacteria luminescence in a certain time. The hybrid TiO2/Ag/PE containers activated at 980 nm (IR) illumination demonstrate 10 times faster release of l-arabinose as opposed to non-activated containers. Fast IR-released l-arabinose switch bacteria fluorescence which we monitor at 510 nm. The approach described herein can be used in many applications where the target and delayed switching and light upconversion are required.
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Affiliation(s)
- Anna A Nikitina
- ITMO University , St. Petersburg 191002 , Russian Federation
| | | | - Ilia S Kassirov
- ITMO University , St. Petersburg 191002 , Russian Federation
| | | | - Elena I Koshel
- ITMO University , St. Petersburg 191002 , Russian Federation
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14
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Lanchuk Y, Nikitina A, Brezhneva N, Ulasevich SA, Semenov SN, Skorb EV. Photocatalytic Regulation of an Autocatalytic Wave of Spatially Propagating Enzymatic Reactions. ChemCatChem 2018. [DOI: 10.1002/cctc.201702005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yulia Lanchuk
- Infochemistry for Self-Adaptive Materials; SCAMT Laboratory; ITMO University; St. Petersburg 197101 Russian Federation
| | - Anna Nikitina
- Infochemistry for Self-Adaptive Materials; SCAMT Laboratory; ITMO University; St. Petersburg 197101 Russian Federation
| | - Nadzeya Brezhneva
- Infochemistry for Self-Adaptive Materials; SCAMT Laboratory; ITMO University; St. Petersburg 197101 Russian Federation
| | - Sviatlana A. Ulasevich
- Infochemistry for Self-Adaptive Materials; SCAMT Laboratory; ITMO University; St. Petersburg 197101 Russian Federation
| | - Sergey N. Semenov
- Chemistry and Chemical Biology; Harvard University; 02138 Cambridge MA USA
| | - Ekaterina V. Skorb
- Infochemistry for Self-Adaptive Materials; SCAMT Laboratory; ITMO University; St. Petersburg 197101 Russian Federation
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15
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Lanchuk Y, Ulasevich SA, Fedotova TA, Kolpashchikov DM, Skorb EV. Towards sustainable diagnostics: replacing unstable H2O2 by photoactive TiO2 in testing systems for visible and tangible diagnostics for use by blind people. RSC Adv 2018; 8:37735-37739. [PMID: 35558580 PMCID: PMC9089394 DOI: 10.1039/c8ra06711b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 10/31/2018] [Indexed: 11/23/2022] Open
Abstract
Blind and color blind people cannot use colorimetric diagnostics; the problem is especially severe in rural areas where high temperatures and the absence of electricity challenge modern diagnostics. Here we propose to replace the unstable component of a diagnostic test, H2O2, with stable TiO2. Under UV irradiation, TiO2 forms reactive oxygen species that initiate polymerization of acrylamide causing liquid-to-gel transition in an analyte-dependent manner. We demonstrate that specific DNA sequences can be detected using this approach. This development may enable the detection of biological molecules by users with limited resources, for example in developing countries or for travelers in remote areas. Blind and color blind people cannot afford colorimetric diagnostics; the problem is especially severe in rural areas where high temperatures and the absence of electricity challenge modern diagnostics.![]()
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Affiliation(s)
| | | | | | - Dmitry M. Kolpashchikov
- ITMO University
- St. Petersburg
- Russian Federation
- Chemistry Department University of Central Florida
- Orlando
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16
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Andreeva DV, Kollath A, Brezhneva N, Sviridov DV, Cafferty BJ, Möhwald H, Skorb EV. Using a chitosan nanolayer as an efficient pH buffer to protect pH-sensitive supramolecular assemblies. Phys Chem Chem Phys 2017; 19:23843-23848. [DOI: 10.1039/c7cp02618h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We propose that chitosan can be used as an efficient pH-responsive protective layer for pH sensitive soft materials.
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Affiliation(s)
- D. V. Andreeva
- Center for Soft and Living Matter
- Institute of basic science
- Ulsan National Institute of Science and Technology
- 44919 Ulsan
- Republic of Korea
| | - A. Kollath
- Physical Chemistry II
- University of Bayreuth
- 95440 Bayreuth
- Germany
| | - N. Brezhneva
- Belarusian State University
- 220030 Minsk
- Belarus
- Max Planck Institute of Colloids and Interfaces
- 14424 Potsdam
| | | | - B. J. Cafferty
- Department of Chemistry and Chemical Biology
- Harvard University
- 02138 Cambridge
- USA
| | - H. Möhwald
- Max Planck Institute of Colloids and Interfaces
- 14424 Potsdam
- Germany
| | - E. V. Skorb
- Max Planck Institute of Colloids and Interfaces
- 14424 Potsdam
- Germany
- Laboratory of Solution Chemistry of Advanced Materials and Technologies (SCAMT) ITMO University St. Petersburg
- Russian Federation
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