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Münteha Nur Sonuç Karaboğa, Mustafa Kemal Sezgintürk
This paper illustrates a new and sensitive electrochemical immunosensor for the analysis of C-reactive protein. Indium Tin Oxide (ITO) disposable sheets were modified by using 3-cyanopropyltrimethoxysilane (CPTMS) self-assembled monolayers (SAMs) for the first time for immobilizing the anti-CRP antibody via covalent interactions without the need for any cross-linking agent. Cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS), as well as square wave voltammetry (SWV) methods were applied to characterize immobilization steps of anti-CRP and to determine the CRP concentration...
March 12, 2018: Journal of Pharmaceutical and Biomedical Analysis
Sukanya Ramaraj, Sakthivel Mani, Shen-Ming Chen, Selvakumar Palanisamy, Vijayalakshmi Velusamy, James M Hall, Tse-Wei Chen, Tien-Wen Tseng
We report a simple hydrothermal method used for the synthesis of Cr2 Se3 hexagons (h-Cr2 Se3 ) and its application towards electrochemical sensing of 4-nitrophenol (4-NP). The formation of h-Cr2 Se3 was confirmed by using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical activity of the h-Cr2 Se3 modified screen-printed carbon electrode (SPCE) towards 4-NP was studied using cyclic voltammetry (CV) and amperometric i-t techniques...
March 19, 2018: Scientific Reports
Mohamed M El-Wekil, Ashraf M Mahmoud, Saad A Alkahtani, Adel A Marzouk, Ramadan Ali
Novel and sensitive electrochemical sensor was fabricated for the assay of anti-HCV ledipasvir (LEDV) in different matrices. The designed sensor was based on 3D spinel ferromagnetic NiFe2 O4 nanospheres and reduced graphene oxide (RGO) supported by morpholinium acid sulphate (MHS), as an ionic liquid (RGO/NSNiFe2 O4 /MHS). This sensor design was assigned to synergistically tailor the unique properties of nanostructured ferrites, RGO, and ionic liquid to maximize the sensor response. Electrode modification prevented aggregation of NiFe2 O4, increasing electroactive surface area and allowed remarkable electro-catalytic oxidation of LEDV with an enhanced oxidation response...
March 11, 2018: Biosensors & Bioelectronics
Siyuan Luo, Maxime A Siegler, Elisabeth Bouwman
Four dimeric nickel(II) complexes [Ni2 Cl2 (BnC2 S)2 ] [ 1 ], [Ni2 Cl2 (BnC3 S)2 ] [ 2 ], [Ni2 (PyC2 S)2 ]Br2 [ 3 ]Br2 , and [Ni2 (PyC3 S)2 ]Br2 [ 4 ]Br2 of four different thiolate-functionalized N-heterocyclic carbene (NHC) ligands were synthesized, and their structures have been determined by single-crystal X-ray crystallography. The four ligands differ by the alkyl chain length between the thiolate group and the benzimidazole nitrogen (two -C2 - or three -C3 - carbon atoms) and the second functionality at the NHC being a benzyl (Bn) or a pyridylmethyl (Py) group...
March 12, 2018: Organometallics
Shruti Shukla, Yuvaraj Haldorai, Vivek K Bajpai, Arunkumar Rengaraj, Seung Kyu Hwang, Xinjie Song, Myunghee Kim, Yun Suk Huh, Young-Kyu Han
A sensitive electrochemical immunosensing platform for the detection of Cronobacter sakazakii was developed using a graphene oxide/gold (GO/Au) composite. Transmission electron microscopy showed that the Au nanoparticles, with an average size of < 30 nm, were well dispersed on the GO surface. For the detection of C. sakazakii, a polyclonal anti-C. sakazakii antibody (IgG) was covalently immobilized to the Au nanoparticles on the surface of the GO/Au composite coated glassy carbon electrode (GCE). The electrochemical sensing performance of immunofunctionalized GCE was characterized by cyclic voltammetry and differential pulse voltammetry...
March 8, 2018: Biosensors & Bioelectronics
Dong Li, Xiaolei Guo, Haoran Song, Tianyi Sun, Jiafeng Wan
Graphite-like material is widely used for preparing various electrodes for wastewater treatment. To enhance the electrochemical degradation efficiency of Nano-graphite (Nano-G) anode, RuO2 -TiO2 /Nano-G composite anode was prepared through the sol-gel method and hot-press technology. RuO2 -TiO2 /Nano-G composite was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and N2 adsorption-desorption. Results showed that RuO2 , TiO2 and Nano-G were composited successfully, and RuO2 and TiO2 nanoparticles were distributed uniformly on the surface of Nano-G sheet...
March 8, 2018: Journal of Hazardous Materials
Jeiwan Tan, Wooseok Yang, Yunjung Oh, Hyungsoo Lee, Jaemin Park, Jooho Moon
Amorphous molybdenum sulfide (a-MoSx) is a promising hydrogen evolution catalyst owing to its low cost and high activity. A simple electrodeposition method (cyclic voltammetry) allows uniform formation of a-MoSx films on conductive surfaces. However, the morphology of a-MoSx, deposited on a TiO2/Sb2Se3 photocathode could be modulated by varying the starting potential. The cathodically initiated a-MoSx showed conformal film-like morphology, while anodic initiation induced inhomogeneous particulate deposition...
March 16, 2018: ACS Applied Materials & Interfaces
Kavita M Jeerage, Stephanie L Candelaria, Samuel M Stavis
Electrocatalytic core-shell nanoparticles, such as nickel/iron oxides for the oxygen evolution reaction (OER) in alkaline electrolytes, require rapid synthesis and measurement for practical use. To meet this challenge, we investigated a novel process of adding Ni(II) species to Fe nanoparticles immediately after synthesis, which we expected to yield Ni-rich shells around Fe-rich cores. Cyclic voltammetry showed that the overpotential decreased as the molar ratio of Ni to Fe in the synthesis vessel increased from 0...
March 15, 2018: Scientific Reports
Chao Wang, Zhi-Yi Hu, Heng Zhao, Wenbei Yu, Sijia Wu, Jing Liu, Lihua Chen, Yu Li, Bao-Lian Su
We report three types of conducting polymers (CPs), polyaniline (PANI), polypyrrole (PPY) and poly (3,4-ethylenedioxythiophene) (PEDOT) to modify the surface of the CdS nanorods to probe their photocorrosion inhibition and photocatalytic hydrogen production. Various characterizations, such as high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and density function theory (DFT) calculations have been conducted to reveal the intrinsic structure of the as-constructed CPs@CdS (@ means CPs at the surface of CdS) core-shell nanorods...
March 6, 2018: Journal of Colloid and Interface Science
Cristina Rodríguez-Seco, Lydia Cabau, Anton Vidal-Ferran, Emilio Palomares
Over hundreds of new organic semiconductor molecules have been synthesized as hole transport materials (HTMs) for perovskite solar cells. However, to date, the well-known N2 , N2 , N2' , N2' , N7 , N7 , N7' , octakis-(4-methoxyphenyl)-9,9-spirobi-[9,9'-spirobi[9 H-fluorene]-2,2',7,7'-tetramine (spiro-OMeTAD) is still the best choice for the best perovskite device performance. Nevertheless, there is a consensus that spiro-OMeTAD by itself is not stable enough for long-term stable devices, and its market price makes its use in large-scale production costly...
March 15, 2018: Accounts of Chemical Research
Yanpeng Zhu, Zeming Xia, Zeying Cai, Ziyong Yuan, Nianqiang Jiang, Tao Li, Yonggen Wang, Xiaoyu Guo, Zhihao Li, Shuang Ma, Dingyong Zhong, Yang Li, Jiaobing Wang
We report the synthesis and characterization of two hexapole [7]helicenes (H7Hs). Single crystal X-ray diffraction unambiguously confirms the molecular structure. H7H absorbs light, with distinct Cotton effect, from ultraviolet to the near infrared (λmax = 618 nm). Cyclic voltammetry reveals nine reversible redox states, consecutively from -2 to +6. These chiroptical and electronic properties of H7H are inaccessible from helicene's small homologues.
March 14, 2018: Journal of the American Chemical Society
Fengkun Chen, Takayuki Tanaka, Tadashi Mori, Atsuhiro Osuka
Polycyclic heteroaromatic compounds including pyrrole units are promising functional scaffolds owing to their electron-rich nature, bright fluorescence, and applicability to anion recognition at the pyrrolic hydrogen. We report herein the effective synthesis of pseudo-aza[5]helicene and aza[7]helicene derivatives, and unexpected formation of azahepta[8]circulenes by oxidative fusion reactions. By choosing reaction conditions and peripheral substituents attached at the terminal indole moieties, we obtained aza[7]helicenes 10a-c and azahepta[8]circulenes 11a,c selectively in moderate to good yields...
March 13, 2018: Chemistry: a European Journal
Atena B Solea, Tobie Wohlhauser, Parisa Abbasi, Yvan Mongbanziama, Aurelien Crochet, Katharina M Fromm, Ghenadie Novitchi, Cyrille Train, Melanie Pilkington, Olimpia Mamula
A versatile synthetic methodology to access the first family of chiral verdazyl N,N'-chelate ligands is described and exemplified by N,N'-dimethyl-, N,N'-di-isopropyl- and N,N'-diphenyl oxoverdazyls bearing two isomers of the pinene-pyridine functional group. Their physical properties were probed by X-band EPR spectroscopy, cyclic voltammetry and DFT calculations. Preliminary reactivity studies show they can act as N,N'-chelate ligands affording a chiral 1 : 1 complex (3b) with CuCl2 , which was characterized by single-crystal X-ray diffraction...
March 13, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Fotios Tsopelas, Dimitris Konstantopoulos, Anna Tsantili Kakoulidou
In the present work, two approaches for the voltammetric fingerprinting of oils and their combination with chemometrics were investigated in order to detect the adulteration of extra virgin olive oil with olive pomace oil as well as the most common seed oils, namely sunflower, soybean and corn oil. In particular, cyclic voltammograms of diluted extra virgin olive oils, regular (pure) olive oils (blends of refined olive oils with virgin olive oils), olive pomace oils and seed oils in presence of dichloromethane and 0...
July 26, 2018: Analytica Chimica Acta
Edyta Matysiak-Brynda, Barbara Wagner, Michał Bystrzejewski, Ireneusz P Grudzinski, Anna M Nowicka
The way of immobilization of the monoclonal antibody (type IgG) on the electrode surface has a significant effect on the amount of the immobilized protein and in consequence on current signal of protein. Herein, we demonstrate that the application of appropriately functionalized phenyl film allowed us to control the orientation of the antibody (Ab) molecules on the electrode surface. The influence of Ab orientation on the efficiency of antigen-antibody interaction was tested with an example blood plasma protein (ferritin; Ft)...
March 5, 2018: Biosensors & Bioelectronics
Dipti Prava Sahoo, Susanginee Nayak, K Hemalata Reddy, Satyabadi Martha, Kulamani Parida
Photocatalytic generation of H2 and O2 by water splitting remains a great challenge for clean and sustainable energy. Taking into the consideration promising heterojunction photocatalysts, analogous energy issues have been mitigated to a meaningful extent. Herein, we have architectured a highly efficient bifunctional heterojunction material, i.e., p-type Co(OH)2 platelets with an n-type ZnCr layered double hydroxide (LDH) by an ultrasonication method. Primarily, the Mott-Schottky measurements confirmed the n- and p-type semiconductive properties of LDH and CH material, respectively, with the construction of a p-n heterojunction...
March 12, 2018: Inorganic Chemistry
Chokchai Puttharugsa, Areeya Aeimbhu
This research was to prepare the titanium dioxide nanotube arrays (TiNT arrays) and deposit the Au nanoparticles on its surface using the pulse electrodeposition technique. The Au nanoparticles-TiNT arrays (AuNP-TiNT arrays) were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction, and cyclic voltammetry. The results showed that the Au nanoparticles were uniformly dispersed on the TiNT array surface. The size and loading of Au nanoparticles can be controlled by deposition time, deposition potential, and concentration of HAuCl4 ...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Swechchha Pandey, K Vipin Raj, Dinesh R Shinde, Kumar Vanka, Varchaswal Kashyap, Sreekumar Kurungot, Chathakudath Prabhakaran Vinod, Samir H Chikkali
Earth abundant, first row transition metals offer a cheap and sustainable alternative to the rare and precious metals. However, utilization of first row metals in catalysis requires harsh reaction conditions, suffers from limited activity, and fails to tolerate functional groups. Reported here is a highly efficient iron catalyzed hydroformylation of alkenes under mild conditions. This protocol operates at 10-30 bars syngas pressure below 100 °C, utilizes readily available ligands and applies to an array of olefins...
March 11, 2018: Journal of the American Chemical Society
Dawn M Mills, Christopher P Martin, Stephanie M Armas, Percy Calvo-Marzal, Dmitry M Kolpashchikov, Karin Y Chumbimuni-Torres
We report a label-free universal biosensing platform for highly selective detection of long nucleic acid strands. The sensor consists of an electrode-immobilized universal stem-loop (USL) probe and two adaptor strands that form a 4J structure in the presence of a specific DNA/RNA analyte. The sensor was characterized by electrochemical impedance spectroscopy (EIS) using K3 [Fe(CN)6 ]/K4 [Fe(CN)6 ] redox couple in solution. An increase in charge transfer resistance (RCT ) was observed upon 4J structure formation, the value of which depends on the analyte length...
March 6, 2018: Biosensors & Bioelectronics
Ishan Gupta, Andrew M J Young
The non-competitive glutamate antagonist, phencyclidine is used in rodents to model behavioural deficits see in schizophrenia. Importantly, these deficits endure long after the cessation of short-term chronic treatment (sub-chronic), indicating that the drug treatment causes long-term changes in the physiology and/or chemistry of the brain. There is evidence that this may occur through glutamatergic modulation of mesolimbic dopamine release, perhaps involving metabotropic glutamate receptors (mGluR). This study sought to investigate the effect of sub-chronic phencyclidine pretreatment on modulation of dopamine neurotransmission by metabotropic glutamate receptors 2 and 5 (mGluR2 and mGluR5) in the nucleus accumbens shell in vitro, with the hypothesis that phencyclidine pretreatment would disrupt the mGluR-mediated modulation of dopamine release...
March 7, 2018: Brain Research
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