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Article ; Online: Graphene derivative-based ink advances inkjet printing technology for fabrication of electrochemical sensors and biosensors.

Nalepa, Martin-Alex / Panáček, David / Dědek, Ivan / Jakubec, Petr / Kupka, Vojtěch / Hrubý, Vítězslav / Petr, Martin / Otyepka, Michal

Biosensors & bioelectronics

2024 Volume 256, Page(s) 116277

Abstract: The field of biosensing would significantly benefit from a disruptive technology enabling flexible manufacturing of uniform electrodes. Inkjet printing holds promise for this, although realizing full electrode manufacturing with this technology remains ... ...

Abstract	The field of biosensing would significantly benefit from a disruptive technology enabling flexible manufacturing of uniform electrodes. Inkjet printing holds promise for this, although realizing full electrode manufacturing with this technology remains challenging. We introduce a nitrogen-doped carboxylated graphene ink (NGA-ink) compatible with commercially available printing technologies. The water-based and additive-free NGA-ink was utilized to produce fully inkjet-printed electrodes (IPEs), which demonstrated successful electrochemical detection of the important neurotransmitter dopamine. The cost-effectiveness of NGA-ink combined with a total cost per electrode of $0.10 renders it a practical solution for customized electrode manufacturing. Furthermore, the high carboxyl group content of NGA-ink (13 wt%) presents opportunities for biomolecule immobilization, paving the way for the development of advanced state-of-the-art biosensors. This study highlights the potential of NGA inkjet-printed electrodes in revolutionizing sensor technology, offering an affordable, scalable alternative to conventional electrochemical systems.
MeSH term(s)	Biosensing Techniques/instrumentation ; Graphite/chemistry ; Ink ; Electrochemical Techniques/methods ; Electrochemical Techniques/instrumentation ; Dopamine/analysis ; Printing ; Electrodes ; Equipment Design ; Nitrogen/chemistry ; Humans
Chemical Substances	Graphite (7782-42-5) ; Dopamine (VTD58H1Z2X) ; Nitrogen (N762921K75)
Language	English
Publishing date	2024-04-07
Publishing country	England
Document type	Journal Article
ZDB-ID	1011023-9
ISSN	1873-4235 ; 0956-5663
ISSN (online)	1873-4235
ISSN	0956-5663
DOI	10.1016/j.bios.2024.116277
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Article ; Online: Safety assessment of graphene acid and cyanographene: Towards new carbon-based nanomedicine

Malina, Tomas / Hirsch, Cordula / Rippl, Alexandra / Panacek, David / Polakova, Katerina / Sedajova, Veronika / Scheibe, Magdalena / Zbořil, Radek / Wick, Peter

Carbon 2023 June 25, v. 211, p. 118093

2023 , Page(s) 118093

Abstract: Graphene oxide (GO) has been intensively studied in last decades as a promising delivery nanoplatform. Although it surpasses the pristine graphene in its hydrophilic properties, variability in GO syntheses and chemical composition, its non-specific ... ...

Abstract	Graphene oxide (GO) has been intensively studied in last decades as a promising delivery nanoplatform. Although it surpasses the pristine graphene in its hydrophilic properties, variability in GO syntheses and chemical composition, its non-specific surface properties and heterogeneity in colloidal stability hamper its commercial application in general. Reliable cytotoxicity investigation of new nanotherapeutics under relevant physiological conditions represents an indispensable first step for their potential clinical translation. In the case of delivery nanoplatforms, the vasculature represents the first encounter after intravenous application. Therefore, an evaluation of interaction with endothelial and immune cells is highly desirable. Here, we performed a first comprehensive safety assessment of emerging graphene derivatives with high potential in biomedical technologies: graphene acid (GA) and cyanographene (GCN). We utilized an easy-to-use co-culture model of matured human umbilical vein endothelial cells (HUVECs) and a human monocyte/macrophage like cell line (THP-1) under dynamic flow conditions. An environment that has not been used yet to evaluate any graphene material. Our results demonstrate that well-defined synthesis/structure of GA and GCN overcome some drawbacks of graphene oxide (GO), the benchmark graphene derivative. Furthermore, applying a system mimicking a simplified blood vessel, both GA and GCN showed excellent biocompatibility without any indication of acute inflammation or dysfunction of endothelium. In summary, GA and GCN display so far all desirable properties to be potentially utilized in drug/gene delivery applications compared to the conventional GO.
Keywords	biocompatibility ; blood vessels ; cell lines ; chemical composition ; coculture ; cytotoxicity ; drugs ; endothelium ; gene transfer ; graphene ; graphene oxide ; humans ; hydrophilicity ; inflammation ; intravenous injection ; macrophages ; models ; monocytes ; nanomedicine ; safety assessment ; Graphene acid ; Cyanographene ; Toxicity ; Endothelial cells ; Co-culture model
Language	English
Dates of publication	2023-06
Size	p. 118093
Publishing place	Pergammon Press
Document type	Article ; Online
ISSN	0008-6223
DOI	10.1016/j.carbon.2023.118093
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Article ; Online: Restoration of antibacterial activity of inactive antibiotics via combined treatment with a cyanographene/Ag nanohybrid.

Hochvaldová, Lucie / Panáček, David / Válková, Lucie / Prucek, Robert / Kohlová, Věra / Večeřová, Renata / Kolář, Milan / Kvítek, Libor / Panáček, Aleš

Scientific reports

2022 Volume 12, Issue 1, Page(s) 5222

Abstract: The number of antibiotic-resistant bacterial strains is increasing due to the excessive and inappropriate use of antibiotics, which are therefore becoming ineffective. Here, we report an effective way of enhancing and restoring the antibacterial activity ...

Abstract	The number of antibiotic-resistant bacterial strains is increasing due to the excessive and inappropriate use of antibiotics, which are therefore becoming ineffective. Here, we report an effective way of enhancing and restoring the antibacterial activity of inactive antibiotics by applying them together with a cyanographene/Ag nanohybrid, a nanomaterial that is applied for the first time for restoring the antibacterial activity of antibiotics. The cyanographene/Ag nanohybrid was synthesized by chemical reduction of a precursor material in which silver cations are coordinated on a cyanographene sheet. The antibacterial efficiency of the combined treatment was evaluated by determining fractional inhibitory concentrations (FIC) for antibiotics with different modes of action (gentamicin, ceftazidime, ciprofloxacin, and colistin) against the strains Escherichia coli, Pseudomonas aeruginosa, and Enterobacter kobei with different resistance mechanisms. Synergistic and partial synergistic effects against multiresistant strains were demonstrated for all of these antibiotics except ciprofloxacin, which exhibited an additive effect. The lowest average FICs equal to 0.29 and 0.39 were obtained for colistin against E. kobei and for gentamicin against E. coli, respectively. More importantly, we have experimentally confirmed for the first time, that interaction between the antibiotic's mode of action and the mechanism of bacterial resistance strongly influenced the combined treatment's efficacy.
MeSH term(s)	Anti-Bacterial Agents/chemistry ; Anti-Bacterial Agents/pharmacology ; Ciprofloxacin/pharmacology ; Colistin/pharmacology ; Drug Synergism ; Escherichia coli ; Gentamicins/pharmacology ; Microbial Sensitivity Tests ; Pseudomonas aeruginosa
Chemical Substances	Anti-Bacterial Agents ; Gentamicins ; Ciprofloxacin (5E8K9I0O4U) ; Colistin (Z67X93HJG1)
Language	English
Publishing date	2022-03-25
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-022-09294-7
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Label-free and reagentless electrochemical genosensor based on graphene acid for meat adulteration detection

Flauzino, José M.R. / Nguyen, Emily P. / Yang, Qiuyue / Rosati, Giulio / Panáček, David / Brito-Madurro, Ana G. / Madurro, João M. / Bakandritsos, Aristides / Otyepka, Michal / Merkoçi, Arben

Biosensors & bioelectronics. 2022 Jan. 01, v. 195

2022

Abstract: With the increased demand for beef in emerging markets, the development of quality-control diagnostics that are fast, cheap and easy to handle is essential. Especially where beef must be free from pork residues, due to religious, cultural or allergic ... ...

Abstract	With the increased demand for beef in emerging markets, the development of quality-control diagnostics that are fast, cheap and easy to handle is essential. Especially where beef must be free from pork residues, due to religious, cultural or allergic reasons, the availability of such diagnostic tools is crucial. In this work, we report a label-free impedimetric genosensor for the sensitive detection of pork residues in meat, by leveraging the biosensing capabilities of graphene acid - a densely and selectively functionalized graphene derivative. A single stranded DNA probe, specific for the pork mitochondrial genome, was immobilized onto carbon screen-printed electrodes modified with graphene acid. It was demonstrated that graphene acid improved the charge transport properties of the electrode, following a simple and rapid electrode modification and detection protocol. Using non-faradaic electrochemical impedance spectroscopy, which does not require any electrochemical indicators or redox pairs, the detection of pork residues in beef was achieved in less than 45 min (including sample preparation), with a limit of detection of 9% w/w pork content in beef samples. Importantly, the sample did not need to be purified or amplified, and the biosensor retained its performance properties unchanged for at least 4 weeks. This set of features places the present pork DNA sensor among the most attractive for further development and commercialization. Furthermore, it paves the way for the development of sensitive and selective point-of-need sensing devices for label-free, fast, simple and reliable monitoring of meat purity.
Keywords	DNA probes ; adulterated products ; beef ; biosensors ; commercialization ; detection limit ; diagnostic techniques ; dielectric spectroscopy ; electrochemistry ; electrodes ; graphene ; mitochondrial genome ; pork ; quality control ; single-stranded DNA
Language	English
Dates of publication	2022-0101
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1011023-9
ISSN	1873-4235 ; 0956-5663
ISSN (online)	1873-4235
ISSN	0956-5663
DOI	10.1016/j.bios.2021.113628
Database	NAL-Catalogue (AGRICOLA)

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Article: Metal-free cysteamine-functionalized graphene alleviates mutual interferences in heavy metal electrochemical detection.

Yang, Qiuyue / Nguyen, Emily P / Panáček, David / Šedajová, Veronika / Hrubý, Vítězslav / Rosati, Giulio / Silva, Cecilia de Carvalho Castro / Bakandritsos, Aristides / Otyepka, Michal / Merkoçi, Arben

Green chemistry : an international journal and green chemistry resource : GC

2023 Volume 25, Issue 4, Page(s) 1647–1657

Abstract: Heavy metal pollutants are of great concern to environmental monitoring due to their potent toxicity. Electrochemical detection, one of the main techniques, is hindered by the mutual interferences of various heavy metal ions in practical use. In ... ...

Abstract	Heavy metal pollutants are of great concern to environmental monitoring due to their potent toxicity. Electrochemical detection, one of the main techniques, is hindered by the mutual interferences of various heavy metal ions in practical use. In particular, the sensitivity of carbon electrodes to Cd
Language	English
Publishing date	2023-02-07
Publishing country	England
Document type	Journal Article
ZDB-ID	2006274-6
ISSN	1463-9270 ; 1463-9262
ISSN (online)	1463-9270
ISSN	1463-9262
DOI	10.1039/d2gc02978b
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Article ; Online: Magnetic Polaron States in Photoluminescent Carbon Dots Enable Hydrogen Peroxide Photoproduction.

Zdražil, Lukáš / Baďura, Zdeněk / Langer, Michal / Kalytchuk, Sergii / Panáček, David / Scheibe, Magdalena / Kment, Štěpán / Kmentová, Hana / Thottappali, Muhammed Arshad / Mohammadi, Elmira / Medveď, Miroslav / Bakandritsos, Aristides / Zoppellaro, Giorgio / Zbořil, Radek / Otyepka, Michal

Small (Weinheim an der Bergstrasse, Germany)

2023 Volume 19, Issue 32, Page(s) e2206587

Abstract: Photoactivation of aspartic acid-based carbon dots (Asp-CDs) induces the generation of spin-separated species, including electron/hole ( ... ...

Abstract	Photoactivation of aspartic acid-based carbon dots (Asp-CDs) induces the generation of spin-separated species, including electron/hole (e
Language	English
Publishing date	2023-04-10
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2168935-0
ISSN	1613-6829 ; 1613-6810
ISSN (online)	1613-6829
ISSN	1613-6810
DOI	10.1002/smll.202206587
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Article ; Online: Click and Detect: Versatile Ampicillin Aptasensor Enabled by Click Chemistry on a Graphene-Alkyne Derivative.

Flauzino, José M R / Nalepa, Martin-Alex / Chronopoulos, Demetrios D / Šedajová, Veronika / Panáček, David / Jakubec, Petr / Kührová, Petra / Pykal, Martin / Banáš, Pavel / Panáček, Aleš / Bakandritsos, Aristides / Otyepka, Michal

Small (Weinheim an der Bergstrasse, Germany)

2023 Volume 19, Issue 51, Page(s) e2207216

Abstract: Tackling the current problem of antimicrobial resistance (AMR) requires fast, inexpensive, and effective methods for controlling and detecting antibiotics in diverse samples at the point of interest. Cost-effective, disposable, point-of-care ... ...

Abstract	Tackling the current problem of antimicrobial resistance (AMR) requires fast, inexpensive, and effective methods for controlling and detecting antibiotics in diverse samples at the point of interest. Cost-effective, disposable, point-of-care electrochemical biosensors are a particularly attractive option. However, there is a need for conductive and versatile carbon-based materials and inks that enable effective bioconjugation under mild conditions for the development of robust, sensitive, and selective devices. This work describes a simple and fast methodology to construct an aptasensor based on a novel graphene derivative equipped with alkyne groups prepared via fluorographene chemistry. Using click chemistry, an aptamer is immobilized and used as a successful platform for the selective determination of ampicillin in real samples in the presence of interfering molecules. The electrochemical aptasensor displayed a detection limit of 1.36 nM, high selectivity among other antibiotics, the storage stability of 4 weeks, and is effective in real samples. Additionally, structural and docking simulations of the aptamer shed light on the ampicillin binding mechanism. The versatility of this platform opens up wide possibilities for constructing a new class of aptasensor based on disposable screen-printed carbon electrodes usable in point-of-care devices.
MeSH term(s)	Graphite/chemistry ; Click Chemistry ; Alkynes ; Aptamers, Nucleotide/chemistry ; Electrochemical Techniques/methods ; Carbon/chemistry ; Biosensing Techniques/methods ; Electrodes ; Gold/chemistry ; Ampicillin ; Anti-Bacterial Agents ; Limit of Detection
Chemical Substances	Graphite (7782-42-5) ; Alkynes ; Aptamers, Nucleotide ; Carbon (7440-44-0) ; Gold (7440-57-5) ; Ampicillin (7C782967RD) ; Anti-Bacterial Agents
Language	English
Publishing date	2023-01-26
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2168935-0
ISSN	1613-6829 ; 1613-6810
ISSN (online)	1613-6829
ISSN	1613-6810
DOI	10.1002/smll.202207216
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Article ; Online: Human virus detection with graphene-based materials

Vermisoglou Eleni / Panáček David / Jayaramulu Kolleboyina / Pykal Martin / Frébort Ivo / Kolář Milan / Hajdúch Marián / Zbořil Radek / Otyepka Michal

Biosensors and Bioelectronics 112436 166 112436

2020

Abstract: Our recent experience of the COVID-19 pandemic has highlighted the importance of easy-to-use, quick, cheap, sensitive and selective detection of virus pathogens for the efficient monitoring and treatment of virus diseases. Early detection of viruses ... ...

Abstract	Our recent experience of the COVID-19 pandemic has highlighted the importance of easy-to-use, quick, cheap, sensitive and selective detection of virus pathogens for the efficient monitoring and treatment of virus diseases. Early detection of viruses provides essential information about possible efficient and targeted treatments, prolongs the therapeutic window and hence reduces morbidity. Graphene is a lightweight, chemically stable and conductive material that can be successfully utilized for the detection of various virus strains. The sensitivity and selectivity of graphene can be enhanced by its functionalization or combination with other materials. Introducing suitable functional groups and/or counterparts in the hybrid structure enables tuning of the optical and electrical properties, which is particularly attractive for rapid and easy-to-use virus detection. In this review, we cover all the different types of graphene-based sensors available for virus detection, including, e.g., photoluminescence and colorimetric sensors, and surface plasmon resonance biosensors. Various strategies of electrochemical detection of viruses based on, e.g., DNA hybridization or antigen-antibody interactions, are also discussed. We summarize the current state-of-the-art applications of graphene-based systems for sensing a variety of viruses, e.g., SARS-CoV-2, influenza, dengue fever, hepatitis C virus, HIV, rotavirus and Zika virus. General principles, mechanisms of action, advantages and drawbacks are presented to provide useful information for the further development and construction of advanced virus biosensors. We highlight that the unique and tunable physicochemical properties of graphene-based nanomaterials make them ideal candidates for engineering and miniaturization of biosensors.
Keywords	covid19
Subject code	600
Language	English
Publishing date	2020-07-22
Publishing country	eu
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Human virus detection with graphene-based materials

Vermisoglou, Eleni / Panáček, David / Jayaramulu, Kolleboyina / Pykal, Martin / Frébort, Ivo / Kolář, Milan / Hajdúch, Marián / Zbořil, Radek / Otyepka, Michal

Biosensors & bioelectronics. 2020 Oct. 15, v. 166

2020

Abstract	Our recent experience of the COVID-19 pandemic has highlighted the importance of easy-to-use, quick, cheap, sensitive and selective detection of virus pathogens for the efficient monitoring and treatment of virus diseases. Early detection of viruses provides essential information about possible efficient and targeted treatments, prolongs the therapeutic window and hence reduces morbidity. Graphene is a lightweight, chemically stable and conductive material that can be successfully utilized for the detection of various virus strains. The sensitivity and selectivity of graphene can be enhanced by its functionalization or combination with other materials. Introducing suitable functional groups and/or counterparts in the hybrid structure enables tuning of the optical and electrical properties, which is particularly attractive for rapid and easy-to-use virus detection. In this review, we cover all the different types of graphene-based sensors available for virus detection, including, e.g., photoluminescence and colorimetric sensors, and surface plasmon resonance biosensors. Various strategies of electrochemical detection of viruses based on, e.g., DNA hybridization or antigen-antibody interactions, are also discussed. We summarize the current state-of-the-art applications of graphene-based systems for sensing a variety of viruses, e.g., SARS-CoV-2, influenza, dengue fever, hepatitis C virus, HIV, rotavirus and Zika virus. General principles, mechanisms of action, advantages and drawbacks are presented to provide useful information for the further development and construction of advanced virus biosensors. We highlight that the unique and tunable physicochemical properties of graphene-based nanomaterials make them ideal candidates for engineering and miniaturization of biosensors.
Keywords	COVID-19 infection ; Hepatitis C virus ; Human immunodeficiency virus ; Rotavirus ; Severe acute respiratory syndrome coronavirus 2 ; Zika virus ; animal viruses ; antigen-antibody reactions ; biosensors ; colorimetry ; dengue ; electrical properties ; electrochemistry ; graphene ; influenza ; mechanism of action ; monitoring ; morbidity ; nanomaterials ; nucleic acid hybridization ; photoluminescence ; physicochemical properties ; surface plasmon resonance ; therapeutics ; viruses
Language	English
Dates of publication	2020-1015
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1011023-9
ISSN	1873-4235 ; 0956-5663
ISSN (online)	1873-4235
ISSN	0956-5663
DOI	10.1016/j.bios.2020.112436
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Human virus detection with graphene-based materials.

Vermisoglou, Eleni / Panáček, David / Jayaramulu, Kolleboyina / Pykal, Martin / Frébort, Ivo / Kolář, Milan / Hajdúch, Marián / Zbořil, Radek / Otyepka, Michal

Biosensors & bioelectronics

2020 Volume 166, Page(s) 112436

Abstract	Our recent experience of the COVID-19 pandemic has highlighted the importance of easy-to-use, quick, cheap, sensitive and selective detection of virus pathogens for the efficient monitoring and treatment of virus diseases. Early detection of viruses provides essential information about possible efficient and targeted treatments, prolongs the therapeutic window and hence reduces morbidity. Graphene is a lightweight, chemically stable and conductive material that can be successfully utilized for the detection of various virus strains. The sensitivity and selectivity of graphene can be enhanced by its functionalization or combination with other materials. Introducing suitable functional groups and/or counterparts in the hybrid structure enables tuning of the optical and electrical properties, which is particularly attractive for rapid and easy-to-use virus detection. In this review, we cover all the different types of graphene-based sensors available for virus detection, including, e.g., photoluminescence and colorimetric sensors, and surface plasmon resonance biosensors. Various strategies of electrochemical detection of viruses based on, e.g., DNA hybridization or antigen-antibody interactions, are also discussed. We summarize the current state-of-the-art applications of graphene-based systems for sensing a variety of viruses, e.g., SARS-CoV-2, influenza, dengue fever, hepatitis C virus, HIV, rotavirus and Zika virus. General principles, mechanisms of action, advantages and drawbacks are presented to provide useful information for the further development and construction of advanced virus biosensors. We highlight that the unique and tunable physicochemical properties of graphene-based nanomaterials make them ideal candidates for engineering and miniaturization of biosensors.
MeSH term(s)	Antigen-Antibody Reactions ; Betacoronavirus/genetics ; Betacoronavirus/isolation & purification ; Betacoronavirus/pathogenicity ; Biosensing Techniques/instrumentation ; Biosensing Techniques/methods ; Biosensing Techniques/trends ; COVID-19 ; COVID-19 Testing ; Clinical Laboratory Techniques/instrumentation ; Clinical Laboratory Techniques/methods ; Clinical Laboratory Techniques/statistics & numerical data ; Colorimetry ; Coronavirus Infections/diagnosis ; Coronavirus Infections/epidemiology ; Coronavirus Infections/virology ; DNA, Viral/analysis ; DNA, Viral/genetics ; Electrochemical Techniques ; Equipment Design ; Graphite/chemistry ; Humans ; Luminescence ; Nanostructures/chemistry ; Nucleic Acid Hybridization ; Pandemics ; Pneumonia, Viral/diagnosis ; Pneumonia, Viral/epidemiology ; Pneumonia, Viral/virology ; Quantum Dots/chemistry ; SARS-CoV-2 ; Spectrum Analysis, Raman ; Surface Plasmon Resonance ; Virology/methods ; Viruses/genetics ; Viruses/isolation & purification ; Viruses/pathogenicity
Chemical Substances	DNA, Viral ; Graphite (7782-42-5)
Keywords	covid19
Language	English
Publishing date	2020-07-22
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	1011023-9
ISSN	1873-4235 ; 0956-5663
ISSN (online)	1873-4235
ISSN	0956-5663
DOI	10.1016/j.bios.2020.112436
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