51
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Muñiz-Calvo S, Guillamón JM, Domínguez I, Doménech-Carbó A. Detecting and Monitoring the Production of Melatonin and Other Related Indole Compounds in Different Saccharomyces Strains by Solid-State Electrochemical Techniques. FOOD ANAL METHOD 2016. [DOI: 10.1007/s12161-016-0699-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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52
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Liu S, Chen Y, Wan P, Zhou C, Zhang S, Mo H. Determination of 5-Hydroxyindole Acetic Acid by Electrochemical Methods with an Oxidized Glassy Carbon Electrode. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.09.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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53
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Costa DJ, Martínez AM, Ribeiro WF, Bichinho KM, Di Nezio MS, Pistonesi MF, Araujo MC. Determination of tryptamine in foods using square wave adsorptive stripping voltammetry. Talanta 2016; 154:134-40. [DOI: 10.1016/j.talanta.2016.03.063] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 03/19/2016] [Accepted: 03/19/2016] [Indexed: 11/25/2022]
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54
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Amyloid-β peptides time-dependent structural modifications: AFM and voltammetric characterization. Anal Chim Acta 2016; 926:36-47. [PMID: 27216391 DOI: 10.1016/j.aca.2016.04.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 03/14/2016] [Accepted: 04/08/2016] [Indexed: 12/20/2022]
Abstract
The human amyloid beta (Aβ) peptides, Aβ1-40 and Aβ1-42, structural modifications, from soluble monomers to fully formed fibrils through intermediate structures, were investigated, and the results were compared with those obtained for the inverse Aβ40-1 and Aβ42-1, mutant Aβ1-40Phe(10) and Aβ1-40Nle(35), and rat Aβ1-40Rat peptide sequences. The aggregation was followed at a slow rate, in chloride free media and room temperature, and revealed to be a sequence-structure process, dependent on the physicochemical properties of each Aβ peptide isoforms, and occurring at different rates and by different pathways. The fibrilization process was investigated by atomic force microscopy (AFM), via changes in the adsorption morphology from: (i) initially random coiled structures of ∼0.6 nm height, corresponding to the Aβ peptide monomers in random coil or in α-helix conformations, to (ii) aggregates and protofibrils of 1.5-6.0 nm height and (iii) two types of fibrils, corresponding to the Aβ peptide in a β-sheet configuration. The reactivity of the carbon electrode surface was considered. The hydrophobic surface induced rapid changes of the Aβ peptide conformations, and differences between the adsorbed fibrils, formed at the carbon surface (beaded, thin, <2.0 nm height) or in solution (long, smooth, thick, >2.0 nm height), were detected. Differential pulse voltammetry showed that, according to their primary structure, the Aβ peptides undergo oxidation in one or two steps, the first step corresponding to the tyrosine amino acids oxidation, and the second one to the histidine and methionine amino acids oxidation. The fibrilization process was electrochemically detected via the decrease of the Aβ peptide oxidation peak currents that occurred in a time dependent manner.
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55
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Dronova M, Smolianitski E, Lev O. Electrooxidation of New Synthetic Cannabinoids: Voltammetric Determination of Drugs in Seized Street Samples and Artificial Saliva. Anal Chem 2016; 88:4487-94. [PMID: 26905258 DOI: 10.1021/acs.analchem.6b00368] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The electrochemical sensing of new psychoactive substances, synthetic cannabinoids (SCs), commonly marketed under the trade name "Spice" is explored for the first time. The electrooxidative transformations of 11 new indole and indazole SCs which are currently the predominant illicit smoking mixtures on the drug market is performed using cyclic and differential pulse voltammetry with various commercially available electrodes (Pt, GC, Bdd). It is found that SCs exhibit voltammetric responses that can be used for their detection in smoking mixtures and artificial saliva with limits of detection in the nanomolar range. The indole-based SCs exhibited an anodic peak at ∼1.5 V (vs Ag/Ag(+)) and ∼1.2 V (vs Ag/AgCl) in acetonitrile and artificial saliva, respectively, and the indazoles exhibited corresponding peaks at ∼1.7 V and ∼1.5 V. The voltammetric procedure was evaluated by prescreening of SCs in 12 confiscated street samples that were also independently analyzed by GC-MS and LC-MS techniques. A good agreement between the three analytical protocols was found. Voltammetry provides a tool for the prescreening of synthetic cannabinoid derivatives in seized materials and biological samples.
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Affiliation(s)
- Marina Dronova
- The Casali Center of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem , Jerusalem 9190401, Israel
| | - Evgeny Smolianitski
- The Casali Center of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem , Jerusalem 9190401, Israel
| | - Ovadia Lev
- The Casali Center of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem , Jerusalem 9190401, Israel
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56
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McLister A, Davis J. Molecular Wiring in Smart Dressings: Opening a New Route to Monitoring Wound pH. Healthcare (Basel) 2015; 3:466-77. [PMID: 27417774 PMCID: PMC4939565 DOI: 10.3390/healthcare3030466] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 06/07/2015] [Accepted: 06/15/2015] [Indexed: 11/18/2022] Open
Abstract
It has been proposed that fluctuations in wound pH can give valuable insights into the healing processes in chronic wounds, but acquiring such data can be a technological challenge especially where there is little sample available. Developments in voltammetric pH sensing have opened up new avenues for the design of probes that can function in ultra-small volumes and can be inherently disposable but, as yet few can meet the demands of wound monitoring. A preliminary investigation of the pH response of a new redox wire prepared from a peptide homopolymer of tryptophan is presented and its potential applicability as a sensing material for use in smart dressings is critically discussed.
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Affiliation(s)
- Anna McLister
- School of Engineering, Ulster University, Jordanstown BT37 0QB, UK.
| | - James Davis
- School of Engineering, Ulster University, Jordanstown BT37 0QB, UK.
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57
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Popa OM, Diculescu VC. Direct electrochemical oxidation of Abelson tyrosine-protein kinase 1 and evaluation of its interaction with synthetic substrate, ATP and inhibitors. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.01.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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58
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Paleček E, Tkáč J, Bartošík M, Bertók T, Ostatná V, Paleček J. Electrochemistry of nonconjugated proteins and glycoproteins. Toward sensors for biomedicine and glycomics. Chem Rev 2015; 115:2045-108. [PMID: 25659975 PMCID: PMC4360380 DOI: 10.1021/cr500279h] [Citation(s) in RCA: 214] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Indexed: 02/07/2023]
Affiliation(s)
- Emil Paleček
- Institute
of Biophysics Academy of Science of the Czech Republic, v.v.i., Královopolská
135, 612 65 Brno, Czech Republic
| | - Jan Tkáč
- Institute
of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38 Bratislava, Slovakia
| | - Martin Bartošík
- Regional
Centre for Applied Molecular Oncology, Masaryk
Memorial Cancer Institute, Žlutý kopec 7, 656 53 Brno, Czech Republic
| | - Tomáš Bertók
- Institute
of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38 Bratislava, Slovakia
| | - Veronika Ostatná
- Institute
of Biophysics Academy of Science of the Czech Republic, v.v.i., Královopolská
135, 612 65 Brno, Czech Republic
| | - Jan Paleček
- Central
European Institute of Technology, Masaryk
University, Kamenice
5, 625 00 Brno, Czech Republic
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59
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Ding H, DeRoy PL, Perreault C, Larivée A, Siddiqui A, Caldwell CG, Harran S, Harran PG. Electrolytic Macrocyclizations: Scalable Synthesis of a Diazonamide-Based Drug Development Candidate. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411663] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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60
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Ding H, DeRoy PL, Perreault C, Larivée A, Siddiqui A, Caldwell CG, Harran S, Harran PG. Electrolytic macrocyclizations: scalable synthesis of a diazonamide-based drug development candidate. Angew Chem Int Ed Engl 2015; 54:4818-22. [PMID: 25729008 DOI: 10.1002/anie.201411663] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Indexed: 11/11/2022]
Abstract
An electrochemical method to synthesize the core macrolactam of diazonamides is described. Large ring-forming dehydrogenation is initiated by anodic oxidation at a graphite surface. The reaction requires no tailoring of the substrate and occurs at ambient temperature in aqueous DMF in an undivided cell open to air. This unique chemistry has enabled a concise, scalable preparation of DZ-2384; a refined analog of diazonamide A slated for clinical development as a cancer therapeutic.
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Affiliation(s)
- Hui Ding
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569 (USA)
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61
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Liang RP, Wang XN, Wang L, Qiu JD. Enantiomeric separation by microchip electrophoresis using bovine serum albumin conjugated magnetic core-shell Fe3 O4 @Au nanocomposites as stationary phase. Electrophoresis 2014; 35:2824-32. [PMID: 25042461 DOI: 10.1002/elps.201400264] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 07/06/2014] [Accepted: 07/10/2014] [Indexed: 11/07/2022]
Abstract
In this work, a novel enantioselective MCE was developed employing BSA-conjugated Fe3 O4 @Au nanoparticles (Fe3 O4 @Au NPs) as stationary phase. Fe3 O4 @Au NPs with high magnetic responsively, excellent solubility, and high dispersibility in water were prepared through a sonochemical synthesis strategy. BSA was then immobilized onto the Fe3 O4 @Au NPs surfaces through the well-developed interaction between Au NPs and amine groups of BSA to form Fe3 O4 @Au NPs-BSA conjugates, which were then locally packed into PDMS microchannels with the help of magnets. The resultant Fe3 O4 @Au NPs-BSA conjugates not only have the magnetism of Fe3 O4 NPs that make them easily manipulated by an external magnetic field, but also have the larger surface and excellent biocompatibility of Au shell, which can incorporate much more biomolecules and well maintain their biological activity. In addition, the successful BSA decorations endowed Fe3 O4 @Au NPs-BSA conjugates with pH-tunable water solubility related to the pI of BSA (pI 4.7) and led to enhanced stability against high ionic strength. Compared with the native PDMS microchannel, the modified surfaces exhibited more stable and suppressed electroosmotic mobility, and less nonspecific adsorption toward analytes. Successful separation of chiral amino acids (tryptophan and threonine) and ofloxacin enantiomers demonstrate that the constructed MCE columns own ideal enantioselectivity. The results are expected to open up a new possibility for high-throughput screening of enantiomers with protein targets as well as a new application of magnetic NPs.
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Affiliation(s)
- Ru-Ping Liang
- Department of Chemistry, Nanchang University, Nanchang, P.R. China
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62
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Adhikari B, Lough AJ, Barker B, Shah A, Xiang C, Kraatz HB. Bis-amino Acid Derivatives of 1,1′-Ferrocenedicarboxylic Acid: Structural, Electrochemical, and Metal Ion Binding Studies. Organometallics 2014. [DOI: 10.1021/om500032p] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Bimalendu Adhikari
- Department
of Physical and Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, M1C 1 A4 Canada
- Department
of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6 Canada
| | - Alan J. Lough
- Department
of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6 Canada
| | - Bryan Barker
- Department
of Physical and Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, M1C 1 A4 Canada
| | - Afzal Shah
- Department
of Physical and Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, M1C 1 A4 Canada
- Department
of Chemistry, Quaid-i-Azam University, 45320 Islamabad, Pakistan
| | - Cuili Xiang
- Department
of Physical and Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, M1C 1 A4 Canada
| | - Heinz-Bernhard Kraatz
- Department
of Physical and Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, M1C 1 A4 Canada
- Department
of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6 Canada
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63
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Demir E, Inam R, Ozkan SA, Uslu B. Electrochemical behavior of tadalafil on TiO2 nanoparticles–MWCNT composite paste electrode and its determination in pharmaceutical dosage forms and human serum samples using adsorptive stripping square wave voltammetry. J Solid State Electrochem 2014. [DOI: 10.1007/s10008-014-2529-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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64
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Total synthesis of ent-(−)-azonazine using a biomimetic direct oxidative cyclization and structural reassignment of natural product. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.03.061] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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65
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Topal BD, Özkan SA, Uslu B. Direct electrochemistry of native and denatured alpha-2-Macroglobulin by solid electrodes. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.02.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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66
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Fabrication of a highly sensitive sumatriptan sensor based on ultrasonic-electrodeposition of Pt nanoparticles on the ZrO2 nanoparticles modified carbon paste electrode. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2013.10.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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67
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Enache T, Oliveira-Brett A. Peptide methionine sulfoxide reductase A (MsrA): Direct electrochemical oxidation on carbon electrodes. Bioelectrochemistry 2013; 89:11-8. [DOI: 10.1016/j.bioelechem.2012.08.004] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 08/07/2012] [Accepted: 08/08/2012] [Indexed: 10/28/2022]
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68
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Ribeiro WF, da Costa DJE, Lourenço AS, Lopes IC, de Medeiros EP, Salazar-Banda GR, do Nascimento VB, de Araújo MCU. Electrochemical study of ricin at glassy carbon electrode. Analyst 2013; 138:4565-73. [DOI: 10.1039/c3an00227f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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69
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Maesa JM, Muñoz-Pascual FX, Baldrich E. Voltammetric discrimination of skatole and indole at disposable screen printed electrodes. Analyst 2013; 138:1346-52. [DOI: 10.1039/c3an36421f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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70
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Suzen S, Tekiner-Gulbas B, Shirinzadeh H, Uslu D, Gurer-Orhan H, Gumustas M, Ozkan SA. Antioxidant activity of indole-based melatonin analogues in erythrocytes and their voltammetric characterization. J Enzyme Inhib Med Chem 2012; 28:1143-55. [PMID: 22994658 DOI: 10.3109/14756366.2012.717223] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Melatonin (MLT) is a strong free-radical scavenger, which protects the body from the effects of oxidants. In recent years, MLT have been described resulting in much attention in the development of synthetic compounds possessing. As a part of our ongoing study a series of indole-based MLT analogue hydrazide/hydrazone derivatives were synthesized, characterized and in vitro antioxidant activity was investigated by evaluating their reducing effect against oxidation of a redox sensitive fluorescent probe. Membrane stabilizing effect of all compounds was also investigated by lactate dehydrogenase leakage assay. Furthermore voltammetric methods have been applied to the synthesized compounds to characterize oxidation potentials to get insight into their metabolism owing to the oxidation mechanisms taking place at the electrode and in the body share similar principles.
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Affiliation(s)
- Sibel Suzen
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Ankara University , Tandogan, Ankara , Turkey
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