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Dinçer E, Küçükoğlu N, Kıvanç M, Şahin Y. Electrochemical DNA Sensor Designed Using the Pencil Graphite Electrode to Detect Listeria monocytogenes. Appl Biochem Biotechnol 2024; 196:4679-4698. [PMID: 37773581 DOI: 10.1007/s12010-023-04732-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/15/2023] [Indexed: 10/01/2023]
Abstract
In the present work, a novel electrochemical DNA sensor was designed to detect L. monocytogenes. Two different gene fragments were selected for the sensor design. One is a 702 bp long fragment of the hlyA gene, encoding the synthesis of listeriolysin O toxin, which is unique only to pathogenic strains of L. monocytogenes and is essential for pathogenicity. The other is a 209 bp long fragment of the 16 S RNA gene found in all species of the Listeria genus. As the working electrode, the pencil graphite electrode was modified in various ways (activated or covered with polypyrrole), and six different combinations were constituted using three types of the modified working electrode and two different gene fragments. The developed system is based on differential pulse voltammetric transduction of guanine oxidation after hybridization between the selected gene fragment (38 µg/mL) and the selected fragment-specific inosine-modified probe (1.8 µmol/L) immobilized on a pencil graphite electrode surface. The comparison of all combinations demonstrates that the best results are obtained with the combination formed from a polypyrrole-coated pencil graphite electrode (prepared at 2 scans) and 702 bp fragment of the hlyA gene. The analysis time is less than 1 hour, and the necessary DNA concentrations for the analysis have been determined as 8.2 × 10-11 M DNA and 2.7 × 10-10 M DNA respectively, for the hlyA gene and 16 S RNA gene.
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Affiliation(s)
- Emine Dinçer
- Department of Nutrition and Dietetics, Faculty of Health Science, Sivas Cumhuriyet University, Sivas, Turkey.
| | - Nurçin Küçükoğlu
- Department of Biology, Faculty of Sciences, Eskisehir Teknik University, Eskisehir, Turkey
| | - Merih Kıvanç
- Department of Biology, Faculty of Sciences, Eskisehir Teknik University, Eskisehir, Turkey
| | - Yücel Şahin
- Department of Chemistry, Faculty of Art and Sciences, Yildiz Technical University, Istanbul, Turkey
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Safiarian M, Ugboya A, Khan I, Marichev KO, Grant KB. New Insights into the Phototoxicity of Anthracene-Based Chromophores: The Chloride Salt Effect†. Chem Res Toxicol 2023; 36:1002-1020. [PMID: 37347986 PMCID: PMC10354805 DOI: 10.1021/acs.chemrestox.2c00235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Indexed: 06/24/2023]
Abstract
Unraveling the causes underlying polycyclic aromatic hydrocarbon phototoxicity is an essential step in understanding the harmful effects of these compounds in nature. Toward this end, we have studied the DNA interactions and photochemistry of N1-(anthracen-9-ylmethyl)ethane-1,2-diaminium dichloride in the presence and absence of NaF, KF, NaCl, KCl, NaBr, KBr, NaI, and KI (350 nm hν, pH 7.0). Exposing pUC19 plasmid to UV light in solutions containing 400 mM KCl formed significantly more direct strand breaks in DNA compared to no-salt control reactions. In contrast, NaCl increased DNA damage moderately, while the sodium(I) and potassium(I) fluoride, bromide, and iodide salts generally inhibited cleavage (I- > Br- > F-). A halide anion-induced heavy-atom effect was indicated by monitoring anthracene photodegradation and by employing the hydroxyl radical (•OH) probe hydroxyphenyl fluorescein (HPF). These studies revealed that among no-salt controls and the eight halide salts, only NaCl and KCl enabled the anthracene to photosensitize the production of high levels of DNA-damaging reactive oxygen species (ROS). Pre-irradiation of N1-(anthracen-9-ylmethyl)ethane-1,2-diaminium dichloride at 350 nm increased the amounts of chloride salt-induced •OH detected by HPF in subsequent anthracene photoactivation experiments. Taking into consideration that •OH and other highly reactive ROS are extremely short-lived, this result suggests that the pre-irradiation step might lead to the formation of oxidized anthracene photoproducts that are exceedingly redox-active. The fluorometric probes HPF and Singlet Oxygen Sensor Green revealed that KCl concentrations ranging from 150 to 400 mM and from 100 to 400 mM, respectively, enhanced N1-(anthracen-9-ylmethyl)ethane-1,2-diaminium dichloride photosensitized •OH and singlet oxygen (1O2) production over no-salt controls. Considering the relatively high levels of Na+, K+, and Cl- ions that exist in the environment and in living organisms, our findings may be relevant to the phototoxic effects exhibited by anthracenes and other polycyclic hydrocarbons in vivo.
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Affiliation(s)
| | | | - Imran Khan
- Department of Chemistry, Georgia State University, Atlanta, Georgia 30303, United States
| | - Kostiantyn O. Marichev
- Department of Chemistry, Georgia State University, Atlanta, Georgia 30303, United States
| | - Kathryn B. Grant
- Department of Chemistry, Georgia State University, Atlanta, Georgia 30303, United States
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Recent applications of quantum dots in optical and electrochemical aptasensing detection of Lysozyme. Anal Biochem 2021; 630:114334. [PMID: 34384745 DOI: 10.1016/j.ab.2021.114334] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Revised: 08/06/2021] [Accepted: 08/09/2021] [Indexed: 11/21/2022]
Abstract
Lysozyme (Lyz) is a naturally occurring enzyme that operates against Gram-positive bacteria and leads to cell death. This antimicrobial enzyme forms the part of the innate defense system of nearly all animals and exists in their somatic discharges such as milk, tears, saliva and urine. Increased Lyz level in serum is an important indication of several severe diseases and so, precise diagnosis of Lyz is an urgent need in biosensing assays. Up to know, various traditional and modern techniques have been introduced for Lyz determination. Although the traditional methods suffer from some significant limitations such as time-consuming, arduous, biochemical screening, bacterial colony isolation, selective enrichment and requiring sophisticated instrumentation or isotope labeling, some new modern approaches like aptamer-based biosensors (aptasensors) and quantum dot (QD) nanomaterials are the main goal in Lyz detection. Electrochemical and optical sensors have been highlighted because of their adaptability and capability to decrease the drawbacks of common methods. Using an aptamer-based biosensor, sensor selectivity is enhanced due to the specific recognition of the analyte. Thereby, in this review article, the recent advances and achievements in electrochemical and optical aptasensing detection of Lyz based on different QD nanomaterials and detection methods have been discussed in detail.
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Krayz GT, Bittner S, Dhiman A, Becker JY. Electrochemistry of Quinones with Respect to their Role in Biomedical Chemistry. CHEM REC 2021; 21:2332-2343. [PMID: 34107155 DOI: 10.1002/tcr.202100069] [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] [Received: 03/08/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 12/18/2022]
Abstract
Quinones are ubiquitous in nature and form one of the largest class of antitumor agents approved for clinical use. They are known to be efficient in inhibiting cancer cells growth. Under physiological conditions they can undergo non-enzymatic one-electron reduction to give the moderately toxic species of semiquinone radical-anion. Thus, electrochemical study of quinones might provide a basic knowledge on semi-quinone radicals formation in both in vivo and in vitro under different media. Several processes are outlined briefly and discussed in the present article. Previously we investigated the electrochemical and spectral properties of ω-N-quinonyl amino acids. Such quinone-bearing peptides are known to be cytotoxic and of potential clinical significance. We were able to prove that the ω-amino quinonyl compounds are very effective in producing stable semiquinone radicals. Moreover, a direct relation was found between the first reduction potentials of the quinonyl moiety and their reactivity towards the ω-amino acids. In order to increase our knowledge of such amino quinonyl compounds and enlarge the arsenal of such cytotoxic compounds, a series of N,N-diquinonyl amines (1-6) bearing an internal proton (stems from the NH moiety) were synthesized. Their electron-transfer capabilities were probed by cyclic voltammetry measurements, in dichloromethane. It was found that the acidic NH group linking the two quinonyl moieties undergoes an initial electrochemical reduction step and generates a nitride anion. This step is followed by further reductions to yield quasi-stable semiquinone radicals and polyanions, Since these acidic diquinones (1-6) serve also as a source of internal proton donors even in non-polar medium, they might cause protonation of basic radical-anions and polyanion intermediates during the various electrochemical stages. The processes are demonstrated and discussed by analyzing different mechanistic schemes. The successful generation of relatively stable semiquinone radicals is a prerequisite for the manifestation of site directed antitumor activity by these bis-quinonyl amino derivatives. Based on the values of their redox potentials some of them could be promising candidates for clinical development.
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Affiliation(s)
- Galia Temtsin Krayz
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
| | - Shmuel Bittner
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
| | - Anand Dhiman
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
| | - James Y Becker
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
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Heterostructured Au/MoS2-MWCNT nanoflowers: A highly efficient support for the electrochemical aptasensing of solvated mercuric ion. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105154] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Konari M, Heydari-Bafrooei E, Dinari M. Efficient immobilization of aptamers on the layered double hydroxide nanohybrids for the electrochemical proteins detection. Int J Biol Macromol 2020; 166:54-60. [PMID: 33075340 DOI: 10.1016/j.ijbiomac.2020.10.063] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 08/31/2020] [Accepted: 10/09/2020] [Indexed: 12/31/2022]
Abstract
Despite the use of layered double hydroxides (LDH) in different electrochemical (bio)sensors, the construction of aptasensors using LDH-based surfaces was not reported to the best of our knowledge. This may be due to the lack of a suitable linker to attach aptamers to the LDH-modified surface. LDH-based aptasensors are established here as very sensitive and reliable devices in serum and cerebrospinal fluid (CSF) analysis. 5'-NH2 DNA aptamer probes were immobilized on the LDH-based surfaces in a vertical conformation without any linker materials. Due to the low electron conductivity of the LDH, carbon nanotubes (CNT) with high electronic conductivity and high surface area were combined with LDH. Thrombin was used as a model protein for aptasensing. The sensor shows a linear range of 0.005-12,000 pmol L-1 and a limit of detection of 0.1 fmol L-1. Moreover, the aptasensor was used for the sensing of thrombin in CSF and serum samples acquired from both healthy and patients with different disease.
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Affiliation(s)
- Maryam Konari
- Department of Chemistry, Faculty of Science, Vali-e-Asr University of Rafsanjan, 77188-97111, Iran
| | - Esmaeil Heydari-Bafrooei
- Department of Chemistry, Faculty of Science, Vali-e-Asr University of Rafsanjan, 77188-97111, Iran.
| | - Mohammad Dinari
- Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran
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Mohammadi A, Heydari-Bafrooei E, Foroughi MM, Mohammadi M. Electrochemical aptasensor for ultrasensitive detection of PCB77 using thionine-functionalized MoS2-rGO nanohybrid. Microchem J 2020. [DOI: 10.1016/j.microc.2020.104747] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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8
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Gao J, Zhang H, Wang Z. A DNA tetrahedron nanoprobe-based fluorescence resonance energy transfer sensing platform for intracellular tumor-related miRNA detection. Analyst 2020; 145:3535-3542. [PMID: 32314984 DOI: 10.1039/c9an02610j] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Accurate and sensitive detection of disease-related microRNAs (miRNAs) is of great significance for early disease diagnosis. In this work, a DNA tetrahedron nanoprobe (DTNP)-based fluorescence resonance energy transfer (FRET) sensing platform (termed DTNP sensor) was constructed for sensitive detection of tumor-related miRNA (e.g., hsa-miR-146b-5p) with DNA assisted cyclic amplification. DTNP was synthesized by DNA self-assembly. In the absence of hsa-miR-146b-5p, the fluorescence DNA (HP) modified with FAM at the 5' terminal and TAMRA at the 3' terminal cannot form the hairpin structure because of the hybridization with the extended DNA strand of the DNA tetrahedron, resulting in a low FRET effect. In the presence of hsa-miR-146b-5p, it would complementarily hybridize with the extended DNA strand of the DNA tetrahedron, leading to the release of HP and occurrence of strong FRET. Thus, the concentration of hsa-miR-146b-5p can be revealed by the change in the fluorescence intensity. Moreover, an assistant DNA was employed to replace hsa-miR-146b-5p for cyclic signal amplification, which can further enhance the detection sensitivity. Under the optimal experimental conditions, the limit of detection for hsa-miR-146b-5p was as low as 6 pM (S/N = 3). Furthermore, the DTNP sensor was successfully applied to evaluate the hsa-miR-146b-5p expression levels in different cell lines. The inhibition of hsa-miR-146b-5p expression in different cells was also investigated and a satisfactory result was obtained.
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Affiliation(s)
- Jiaxue Gao
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
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Impedimetric aptasensing of the breast cancer biomarker HER2 using a glassy carbon electrode modified with gold nanoparticles in a composite consisting of electrochemically reduced graphene oxide and single-walled carbon nanotubes. Mikrochim Acta 2019; 186:495. [PMID: 31270702 DOI: 10.1007/s00604-019-3619-y] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 06/15/2019] [Indexed: 01/18/2023]
Abstract
A method is presented for electrochemical determination of the breast cancer biomarker HER2. A glassy carbon electrode (GCE) was modified with densely packed gold nanoparticles placed on a composite consisting of electrochemically reduced graphene oxide and single walled carbon nanotubes (ErGO-SWCNTs). An aptamer directed against HER2 was then immobilized ono the GCE. The modified GCE was characterized by cyclic voltammetry, differential pulse voltammetry and electrochemical impedance spectroscopy. The immobilized aptamer selectively recognizes HER2 on the electrode interface, and this leads to an increased charge transfer resistance (Rct) of the electrode when using ferri/ferro-cyanide as the electrochemical probe. The method has a low limit of detection (50 fg·mL-1) and a wide analytical range (0.1 pg·mL-1 to 1 ng·mL-1). The assay is highly reproducible and specific. Clinical application was demonstrated by analysis of the HER2 levels in serum samples, and sera of breast cancer patients were successfully discriminated from sera of healthy persons. Graphical abstract An electrochemical aptasensor for HER2 is described that is based on the immobilization of anti-HER2 aptamer on a glassy carbon electrode modified with a nanocomposite prepred fromreduced graphene oxide, carbon nanotubes and gold nanoparticles.
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Thymoquinone loaded mesoporous silica nanoparticles retard cell invasion and enhance in vitro cytotoxicity due to ROS mediated apoptosis in HeLa and MCF-7 cell lines. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 104:109881. [PMID: 31499940 DOI: 10.1016/j.msec.2019.109881] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 06/10/2019] [Accepted: 06/10/2019] [Indexed: 12/14/2022]
Abstract
Thymoquinone (TQ) loaded monodispersed mesoporous silica nanoparticles (TQ-MSNPs) with size of 188 ± 3 nm were prepared and characterized using DLS, TEM and FTIR. These TQ-MSNPs overcome the limitations of free TQ like hydrophobicity, low aqueous and photo stability and thus enhance its anticancer activity. In vitro release kinetics showed biphasic drug release where up to 50% was released in first 8 h and subsequently 98% released after 48 h. Enhanced cytotoxicity of TQ-MSNPs was observed against MCF-7 and HeLa cell lines as compared to free TQ. DAPI and Annexin V-FITC/PI staining confirmed the induction of apoptosis in cancer cells following treatment with TQ-MSNPs. Also, TQ-MSNPs exhibited enhanced anti-invasion properties against both cell lines as very low concentration of loaded TQ imparts similar benefits as free TQ. Both TQ and TQ-MSNPs exerted their cytotoxicity via reactive oxygen species (ROS) generation, as addition of an antioxidant NAC attenuated their killing activity.
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Wang Q, Leong WF, Elias RJ, Tikekar RV. UV-C irradiated gallic acid exhibits enhanced antimicrobial activity via generation of reactive oxidative species and quinone. Food Chem 2019; 287:303-312. [PMID: 30857704 DOI: 10.1016/j.foodchem.2019.02.041] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 12/21/2018] [Accepted: 02/10/2019] [Indexed: 12/20/2022]
Abstract
A novel light-enhanced antimicrobial treatment was developed by exposing gallic acid (GA) to UV-C light. GA (15 mM) solution was exposed to UV-C for 30 min and subsequently incubated with E. coli O157:H7 for 30 min to achieve a 3.2 ± 0.2 log CFU/mL reduction. The antimicrobial activity is affected by the irradiation duration, wavelength, and pH of solution. The addition of benzenesulfinic acid (BSA) to UV-C irradiated GA lowered (P < 0.05) its antimicrobial activity, indicating that quinones contributed to its overall antimicrobial effect. In addition, the attenuated (P < 0.05) antimicrobial activity of UV-C exposed GA in the presence of reactive oxidative species (ROS) quenchers, the generation of hydrogen peroxide, and increased levels of intracellular oxidative stress detected in E. coli O157:H7 illustrated that ROS also played a role in the antimicrobial effect of UV-C irradiated GA. UV-C irradiated GA could be applied as a novel antimicrobial in food systems.
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Affiliation(s)
- Qingyang Wang
- Department of Nutrition and Food Science, University of Maryland, College Park, MD 20742, USA.
| | - Wai Fun Leong
- Department of Food Science, The Pennsylvania State University, University Park, PA 16802, USA.
| | - Ryan J Elias
- Department of Food Science, The Pennsylvania State University, University Park, PA 16802, USA.
| | - Rohan V Tikekar
- Department of Nutrition and Food Science, University of Maryland, College Park, MD 20742, USA.
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Cytoprotective and antioxidant properties of organic selenides for the myelin-forming cells, oligodendrocytes. Bioorg Chem 2018; 80:43-56. [PMID: 29864687 DOI: 10.1016/j.bioorg.2018.05.019] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 05/16/2018] [Accepted: 05/20/2018] [Indexed: 12/25/2022]
Abstract
Here a new series of twenty-one organoselenides, of potential protective activity, were synthesized and tested for their intrinsic cytotoxicity, anti-apoptotic and antioxidant capacities in oligodendrocytes. Most of the organoselenides were able to decrease the ROS levels, revealing antioxidant properties. Compounds 5b and 7b showed a high glutathione peroxidase (GPx)-like activities, which were 1.5 folds more active than ebselen. Remarkably, compound 5a diminished the formation of the oligodendrocytes SubG1 peak in a concentration-dependent manner, indicating its anti-apoptotic properties. Furthermore, based on the SwissADME web interface, we performed an in-silico structure-activity relationship to explore the drug-likeness of these organoselenides, predicting the pharmacokinetic parameters for compounds of interest that could cross the blood-brain barrier. Collectively, we present new organoselenide compounds with cytoprotective and antioxidant properties that can be considered as promising drug candidates for myelin diseases.
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An ultrasensitive and selective electrochemical aptasensor based on rGO-MWCNTs/Chitosan/carbon quantum dot for the detection of lysozyme. Biosens Bioelectron 2018; 115:37-44. [PMID: 29793133 DOI: 10.1016/j.bios.2018.05.012] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 04/16/2018] [Accepted: 05/07/2018] [Indexed: 01/08/2023]
Abstract
An aptamer-based method is described for the electrochemical determination of lysozyme. A glassy carbon electrode was modified with a nanocomposite composed of reduced graphene oxide (rGO), multi-walled carbon nanotubes (MWCNTs), chitosan (CS), and a synthesized carbon quantum dot (CQD) from CS. The composition of the nanocomposite (rGO-MWCNT/CS/CQD) warrants a high surface-to-volume ratio, high conductivity, high stability, and great electrocatalytic activity. This nanocomposite provides a suitable site for better immobilization of aptamers due to the existence of many amino and carboxyl functional groups, and remaining oxygen-related defects properties in rGO. In addition, this nanocomposite allows considerable enhancement of the electrochemical signal and contributes to improving sensitivity. The amino-linked lysozyme aptamers were immobilized on the nanocomposite through covalent coupling between the amino groups of the aptamer and the amino groups of the nanocomposite using glutaraldehyde (GLA) linker. The modified electrode was characterized by electrochemical methods including differential pulse voltammetry (DPV), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). In the presence of lysozyme, the immobilized aptamer selectively caught the target lysozyme on the electrode interface that leads to a decrease in the DPV peak current and an increase in Charge Transfer Resistance (Rct) in EIS as an analytical signal. Using the obtained data from DPV and EIS techniques, two calibration curves were drawn. The anti-lysozyme aptasensor proposed has two very low LODs. These measures are 3.7 and 1.9 fmol L-1 within the wide detection ranges of 20 fmol L-1 to 10 nmol L-1, and 10 fmol L-1 to 100 nmol L-1 for DPV and EIS calibration curves, respectively. The GCE/rGO-MWCNT/CS/CQD showed sensitivity, high reproducibility, specificity and rapid response for lysozyme which can be used in biomedical fields.
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Rezaei B, Jamei HR, Ensafi AA. Lysozyme aptasensor based on a glassy carbon electrode modified with a nanocomposite consisting of multi-walled carbon nanotubes, poly(diallyl dimethyl ammonium chloride) and carbon quantum dots. Mikrochim Acta 2018; 185:180. [PMID: 29594452 DOI: 10.1007/s00604-017-2656-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 12/29/2017] [Indexed: 12/25/2022]
Abstract
An aptamer-based method is described for electrochemical determination of lysozyme. A glassy carbon electrode was modified with a nanocomposite composed of multi-walled carbon nanotubes, poly(diallyl dimethyl ammonium chloride), and carbon quantum dots. The composition of the nanocomposite (MWCNT/PDDA/CQD) warrants good electrical conductivity and a high surface-to-volume ratio. The lysozyme-binding aptamers were immobilized on the nanocomposite via covalent coupling between the amino groups of the aptamer and the carboxy groups of the nanocomposite. The modified electrode was characterized by electrochemical impedance spectroscopy, cyclic voltammetry and differential pulse voltammetry. The use of this nanocomposite results in a considerable enhancement of the electrochemical signal and contributes to improving sensitivity. Hexacyanoferrate was used as an electrochemical probe to study the dependence of the peak current on lysozyme concentration. In the presence of lysozyme, the interaction of lysozyme with immobilized aptamer results in a decrease of the peak current, best measured at +0.15 V vs. Ag/AgCl. A plot of peak current changes versus the logarithm of the lysozyme concentration is linear in the 50 fmol L-1 to 10 nmol L-1 concentration range, with a 12.9 fmol L-1 detection limit (at an S/N ratio of 3). The method is highly reproducible, specific and sensitive, and the electrode has a rapid response. It was applied to the determination of lysozyme in egg white, serum, and urine. Graphical abstract Schematic of a nanocomposite composed of multi-walled carbon nanotubes (MWCNTs), poly(diallyldimethyl ammonium chloride) (PDDA), and carbon quantum dots (CQDs) for use in a lysozyme aptasensor. The aptamer was immobilized on the surface, and bovine serum albumin (BSA) was applied to block the surface. The changes of peak current for the electrochemical probe hexacyanoferrate (Fe(CN)63-/4-) in the presence and absence of lysozyme was traced.
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Affiliation(s)
- Behzad Rezaei
- Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111 I.R., Iran.
| | - Hamid Reza Jamei
- Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111 I.R., Iran
| | - Ali Asghar Ensafi
- Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111 I.R., Iran
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Developing a sensitive DNA biosensor for the detection of flutamide using electrochemical method. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2017. [DOI: 10.1007/s13738-017-1083-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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16
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Silva TL, Ferreira FR, de Vasconcelos CC, da Silva RC, Lima DJDP, Costa PRR, Netto CD, Goulart MOF. Reactive Oxygen Species Release, Alkylating Ability, and DNA Interactions of a Pterocarpanquinone: A Test Case for Electrochemistry. ChemElectroChem 2016. [DOI: 10.1002/celc.201600504] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Thaissa L. Silva
- Instituto de Química e Biotecnologia; Universidade Federal de Alagoas; Maceió, AL, CEP 57072-970 Brazil
| | - Fabricia R. Ferreira
- Instituto de Química e Biotecnologia; Universidade Federal de Alagoas; Maceió, AL, CEP 57072-970 Brazil
| | - Camila C. de Vasconcelos
- Instituto de Química e Biotecnologia; Universidade Federal de Alagoas; Maceió, AL, CEP 57072-970 Brazil
| | | | - Dimas José da P. Lima
- Instituto de Química e Biotecnologia; Universidade Federal de Alagoas; Maceió, AL, CEP 57072-970 Brazil
| | - Paulo R. R. Costa
- Laboratório de Química Bioorgânica, Núcleo de Pesquisas de Produtos Naturais, Centro de Ciências da Saúde, Bloco H; Universidade Federal do Rio de Janeiro, RJ, CEP; 21941-590 Brazil
| | - Chaquip D. Netto
- Laboratório de Química, Campus Professor Aloísio Teixeira; Universidade Federal do Rio de Janeiro; Macaé, RJ, CEP 27930-560 Brazil
| | - Marília O. F. Goulart
- Instituto de Química e Biotecnologia; Universidade Federal de Alagoas; Maceió, AL, CEP 57072-970 Brazil
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Samiee F, Pedron FN, Estrin DA, Trevani L. Experimental and Theoretical Study of the High-Temperature UV-Visible Spectra of Aqueous Hydroquinone and 1,4-Benzoquinone. J Phys Chem B 2016; 120:10547-10552. [PMID: 27627463 DOI: 10.1021/acs.jpcb.6b07893] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
UV-visible spectroscopic studies of aqueous hydroquinone (HQ) and 1,4-benzoquinone (BQ) have been carried out along with classical molecular dynamics (MD) and quantum calculations. The experimental results confirmed that HQ is stable in hot compressed water up to at least 523 K at 70 bar, but BQ decomposes at temperatures lower than 373 K, leading to the formation of HQ and other nonabsorbing products. Even though benzoquinone is not stable, our study significantly extended the temperature range of other spectroscopic studies, and the spectra of HQ up to 523 K can still be useful for other studies, particularly those related to organic species in deep ocean hydrothermal vents. Classical MD simulations at high temperatures show, as expected, a weakening of the solute-solvent H-bonding interactions. The dependence of the maximum absorption of BQ on temperature was also analyzed, although a significant degree of decomposition was observed in the time frame of our experiments. The shift of the maximum absorption peak of BQ with temperature was consistent with time-dependent density functional theory calculations.
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Affiliation(s)
- Fereshteh Samiee
- Faculty of Science, University of Ontario Institute of Technology , 2000 Simcoe Street North, Oshawa L1H 7K4, Ontario, Canada
| | - Federico N Pedron
- Departamento de Química Inorgánica, Analítica y Química Física, and INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria , Pab. 2, C1428EHA CABA, Argentina
| | - Dario A Estrin
- Departamento de Química Inorgánica, Analítica y Química Física, and INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria , Pab. 2, C1428EHA CABA, Argentina
| | - Liliana Trevani
- Faculty of Science, University of Ontario Institute of Technology , 2000 Simcoe Street North, Oshawa L1H 7K4, Ontario, Canada
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Mittal S, Kaur H, Gautam N, Mantha AK. Biosensors for breast cancer diagnosis: A review of bioreceptors, biotransducers and signal amplification strategies. Biosens Bioelectron 2016; 88:217-231. [PMID: 27567264 DOI: 10.1016/j.bios.2016.08.028] [Citation(s) in RCA: 136] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 08/10/2016] [Accepted: 08/11/2016] [Indexed: 11/19/2022]
Abstract
Breast cancer is highly prevalent in females and accounts for second highest number of deaths, worldwide. Cumbersome, expensive and time consuming detection techniques presently available for detection of breast cancer potentiates the need for development of novel, specific and ultrasensitive devices. Biosensors are the promising and selective detection devices which hold immense potential as point of care (POC) tools. Present review comprehensively scrutinizes various breast cancer biosensors developed so far and their technical evaluation with respect to efficiency and potency of selected bioreceptors and biotransducers. Use of glycoproteins, DNA biomarkers, micro-RNA, circulatory tumor cells (CTC) and some potential biomarkers are introduced briefly. The review also discusses various strategies used in signal amplification such as nanomaterials, redox mediators, p19 protein, duplex specific nucleases (DSN) and redox cycling.
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Affiliation(s)
- Sunil Mittal
- Centre for Environmental Science and Technology, Central University of Punjab, Bathinda, 151001 India.
| | - Hardeep Kaur
- Centre for Environmental Science and Technology, Central University of Punjab, Bathinda, 151001 India.
| | - Nandini Gautam
- Centre for Environmental Science and Technology, Central University of Punjab, Bathinda, 151001 India.
| | - Anil K Mantha
- Centre for Animal Sciences, Central University of Punjab, Bathinda, 151001 India.
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