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https://www.readbyqxmd.com/read/28551437/continuous-fast-fourier-transforms-cyclic-voltammetry-as-a-new-approach-for-investigation-of-skim-milk-k-casein-proteolysis-a-comparative-study
#1
Javad Shabani Shayeh, Yahya Sefidbakht, Seyed Omid Ranaei Siadat, Kaveh Niknam
Cheese production is relied upon the action of Rennet on the casein micelles of milk. Chymosin assay methods are usually time consuming and offline. Herein, we report a new electrochemical technique for studying the proteolysis of K-casein. The interaction of rennet and its substrate was studied by fast Fourier transform continuous cyclic Voltammetry (FFTCCV) based on a determination of k-casein in aqueous solution. FFTCCV technique is a very useful method for studying the enzymatic procedures. Fast response, no need of modified electrodes or complex equipment is some of FFTCCV advantages...
May 24, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28551153/sequential-injection-system-with-amperometric-immunosensor-for-sensitive-determination-of-human-immunoglobulin-g
#2
Chidkamon Thunkhamrak, Preeyaporn Reanpang, Kontad Ounnunkad, Jaroon Jakmunee
Sequential injection (SI) system incorporated with amperometric immunosensor was developed for sensitive determination of human immunoglobulin G (HIgG). A cost effective label-free immunosensor was fabricated by immobilizing anti-HIgG on a graphene oxide (GO) modified screen-printed carbon electrode (SPCE). The developed electrode was characterized by cyclic voltammetry(CV), scanning electron microscope(SEM), and energy dispersive spectroscopy(EDS) which confirmed the selective immunointeraction of HIgG to the anti-HIgG on the electrode, thus reduced the amperometric current of [Fe(CN)6](3-/4-) redox probe...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28551146/anodic-stripping-voltammetry-following-double-deposition-and-stripping-steps-application-of-a-new-approach-in-the-course-of-lead-ion-determination
#3
Iwona Gęca, Mieczyslaw Korolczuk
A new approach of double deposition and stripping steps was proposed in the course of anodic stripping lead ion determination in order to decrease the detection limit. Two bismuth film working electrodes differing in their surface area and mounted in one body were used for the measurements. In short, an ensemble of microelectrodes was centrally mounted in the electrode of a large surface area. The application of a new type of arrangement in combination with the additional deposition and stripping steps in one measurement cycle and in one electrochemical cell not only increased the sensitivity of determinations, but also facilitated the analysis...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28551136/synthesis-of-conductive-polymeric-ionic-liquid-ni-nanocomposite-and-its-application-to-construct-a-nanostructure-based-electrochemical-sensor-for-determination-of-warfarin-in-the-presence-of-tramadol
#4
Elaheh Molaakbari, Ali Mostafavi, Hadi Beitollahi, Zeinab Tohidiyan
In the current study, poly(MImEO8BS)-Ni nanocomposite was synthesized and applied to modify a glassy carbon electrode along with conductive polymeric ionic liquids. The electrochemical investigation of the modified electrode as well as its efficiency for voltammetric oxidation of warfarin is elucidated. The electrode was used to study the voltammetric oxidation of warfarin by employing cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry, and square wave voltammetry (SWV) as diagnostic techniques...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28551117/electrochemical-determination-of-m-tuberculosis-antigen-based-on-poly-3-4-ethylenedioxythiophene-and-functionalized-carbon-nanotubes-hybrid-platform
#5
Himkusha Thakur, Navpreet Kaur, Dipti Sareen, Nirmal Prabhakar
An electrochemical DNA aptasensor for the detection of Mycobacterium tuberculosis (M. tb) antigen MPT64, was developed using Poly(3,4-ethylenedioxythiophene) (PEDOT) doped with carbon nanotubes (CNTs). The biotinylated aptamer was immobilized onto streptavidin attached to -COOH functionalized CNTs via streptavidin-biotin interaction. Various characterization studies as FT-IR, FE-SEM, EIS and DPV were done to validate each fabrication step of the aptasensor. Optimization studies related to aptamer concentration and response time were performed...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28550781/on-the-behavior-of-reduced-graphene-oxide-based-electrodes-coated-with-dispersed-platinum-by-alternate-current-methods-in-the-electrochemical-degradation-of-reactive-dyes
#6
A I Del Río, C García, J Molina, J Fernández, J Bonastre, F Cases
The electrochemical behavior of different carbon-based electrodes with and without nanoparticles of platinum electrochemically dispersed on their surface has been studied. Among others, reduced graphene oxide based electrodes was used to determine the best conditions for the decolorization/degradation of the reactive dye C.I. Reactive Orange 4 in sulfuric medium. Firstly, the electrochemical behavior was evaluated by cyclic voltammetry. Secondly, different electrolyses were performed using two cell configurations: cell with anodic and cathodic compartments separated (divided configuration) and without any separation (undivided configuration)...
May 22, 2017: Chemosphere
https://www.readbyqxmd.com/read/28550749/a-novel-non-enzymatic-glucose-sensor-based-on-the-modification-of-carbon-paste-electrode-with-cuo-nanoflower-designing-the-experiments-by-response-surface-methodology-rsm
#7
Zahra Amani-Beni, Alireza Nezamzadeh-Ejhieh
A non enzymatic modified electrode was constructed based on the modification of carbon paste electrode with CuO nanoflower (CuO-CPE). The raw and modified samples were characterized by XRD, TEM, SEM-EDX and X-ray mapping techniques. The proposed CuO-CPE showed a well voltammetric peak pair in cyclic voltammetry which of peak currents were decreased in the presence of glucose. Hence, this decrease in peak current was used for voltammetric determination of glucose. To evaluate interactions between the influencing variables, experiments were designed by response surface methodology (RSM) and the results showed CuO%-pH have the most effect on square wave voltammetric response...
May 19, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28550286/ultrasensitive-multiplexed-immunoassay-of-autophagic-biomarkers-based-on-au-rgo-and-au-nanocages-amplifying-electrochemcial-signal
#8
Guannan Wang, Yankun Li, Jinlei Liu, Yajing Yuan, Zhaoliang Shen, Xifan Mei
A novel sandwich-assay electrochemical immunosensor for simultaneous determination of autophagic biomarkers was introduced for the first time, the gold-reduced grapheme oxide nanocomposite (Au/r-GO) set as a good conductive platform with super high specific area, and provided more binding sites for the both antibodies of Beclin-1 and LC3B-II. While Au nanocages (AuNCs) served as good conductive platform to encapsulate a large amount of redox probe and secondary antibodies for signal amplification, due to the abundant reactive oxygen functional groups on its surface...
May 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28550154/an-amperometric-h2o2biosensor-based-on-hemoglobin-nanoparticles-immobilized-onto-a-gold-electrode
#9
Vinay Narwal, Neelam Yadav, Manisha Thakur, Chandra Shekhar Pundir
The nanoparticles (NPs) of hemoglobin (Hb) were prepared by desolvation method and characterized by transmission electron microscopy (TEM), ultraviolet (UV) spectroscopy and Fourier-transform infrared spectroscopy (FTIR). An amperometric H2O2 biosensor was constructed by immobilizing HbNPs covalently onto a polycrystalline Au electrode (AuE). HbNPs/AuE was characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) before and after immobilization of HbNPs...
May 26, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28548867/statins-determination-a-review-of-electrochemical-techniques
#10
I Antal, M Koneracka, V Zavisova, M Kubovcikova, Zh Kormosh, P Kopcansky
The use of electroanalytical techniques for the determination of statins (Atorvastatin, Fluvastatin, Lovastatin, Pitavastatin, Pravastatin, Rosuvastatin and Simvastatin) is reviewed covering the period from 1997 to 2016. Among all of the published electrochemical methods, voltammetry and polarography are the most popular techniques for determination of statins and both are used for the analysis of pharmaceutical dosage forms and biological samples. Determination of statins by potentiometric method using ion-selective electrodes is reported in only few papers...
May 26, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28548830/stable-5-5%C3%A2-substituted-2-2%C3%A2-bipyrroles-building-blocks-for-macrocyclic-and-materials-chemistry
#11
Gonzalo Anguera, Brice Kauffmann, Jose Ignacio Borrell, Salvador Borros, David Sánchez-García
The preparation and characterization of a family of stable 2,2´-bipyrroles substituted at positions 5,5´with thienyl, phenyl, TMS-ethynyl, and vinyl groups is reported herein. The synthesis of these new bipyrroles comprises three steps: formation of the corresponding 5,5´-unsubstituted bipyrrole, bromination and Stille or Suzuki coupling. The best results in the coupling are obtained using the Stille reaction under microwave irradiation. The new compounds have been fully characterized by UV-vis absorption, fluorescence and IR spectroscopies and cyclic voltammetry...
May 26, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28548671/controllable-n-fe2o3-graphene-nanomaterials-by-ald-applied-in-an-aptasensor-with-enhanced-electrochemical-performance-for-thrombin-detection
#12
Hongfen Zhang, Baiyan Zhang, Anjia Chen, Yong Qin
An elegant atomic layer deposition (ALD) method has been employed for the controllable preparation of a uniform Fe2O3-coated graphene nanostructure (Fe2O3@graphene). The Fe2O3 coating thickness of the Fe2O3@graphene nanostructure can be tuned by varying the cycle number of Fe2O3 ALD. The produced Fe2O3@graphene composites are characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and cyclic voltammetry (CV). It is revealed that Fe2O3 is effectively deposited on the surface of graphene...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28548499/polyoxovanadate-alkoxide-clusters-as-a-redox-reservoir-for-iron
#13
Feng Li, Stephanie H Carpenter, Robert F Higgins, Mark G Hitt, William W Brennessel, Maryline G Ferrier, Samantha K Cary, Juan S Lezama-Pacheco, Joshua T Wright, Benjamin W Stein, Matthew P Shores, Michael L Neidig, Stosh A Kozimor, Ellen M Matson
Inspired by the multielectron redox chemistry achieved using conventional organic-based redox-active ligands, we have characterized a series of iron-functionalized polyoxovanadate-alkoxide clusters in which the metal oxide scaffold functions as a three-dimensional, electron-deficient metalloligand. Four heterometallic clusters were prepared through sequential reduction, demonstrating that the metal oxide scaffold is capable of storing up to four electrons. These reduced products were characterized by cyclic voltammetry, IR, electronic absorption, and (1)H NMR spectroscopies...
May 26, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28544964/biophysical-and-biological-studies-of-some-polymer-grafted-metallo-intercalators
#14
Yesaiyan Manojkumar, Subramanian Ambika, Rajendran Senthilkumar, Sankaralingam Arunachalam
Two water-soluble polymer-copper(II) complexes, [Cu(ip)2(BPEI)](ClO4)2·H2O (Complex 1) and [Cu(dppz)2BPEI](ClO4)2·H2O (Complex 2) with different degree of coordination have been synthesized and characterized. The interaction between the prepared complexes and CTDNA has been assessed by various physico-chemical methods The spectroscopic and the cyclic voltammetry studies have revealed that both the complexes interact with CTDNA through intercalation binding mode. Among the two complexes, Complex 2 has higher binding affinity with CTDNA...
May 15, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28544565/base-selective-five-versus-six-membered-ring-annulation-in-palladium-catalyzed-c-c-coupling-cascade-reactions-new-access-to-electron-poor-polycyclic-aromatic-dicarboximides
#15
Sabine Seifert, David Schmidt, Kazutaka Shoyama, Frank Würthner
Palladium-catalyzed base-selective annulation of dibromonaphthalimide to different aryl boronate esters by combined Suzuki-Miyaura cross-coupling and direct C-H arylation afforded a series of new five- and six-membered ring annulated electron-poor polycyclic aromatic hydrocarbons. Cesium carbonate (Cs2 CO3 ) as auxiliary base in these C-C coupling cascade reactions led exclusively to six-membered ring annulation, while the use of organic base diazabicycloundecene (DBU) afforded the corresponding five-membered ring annulated products...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28540962/electrochemical-evaluation-methods-of-vanadium-flow-battery-electrodes
#16
Lantao Wu, Jianshe Wang, Yi Shen, Le Liu, Jingyu Xi
Various testing methods, such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), have been employed to evaluate the electrode performance of vanadium flow batteries (VFB). Due to the variations in the testing devices and characterization parameters in the literature, a number of reported results are incomparable and even sometimes contradictory. In this report, a reliable device is proposed for the electrochemical characterization of electrode materials, and the parameter selection was demonstrated to be critical for achieving reliable evaluation and reducing the effects of side reactions...
May 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28540651/biologically-active-cu-ii-co-ii-ni-ii-and-zn-ii-complexes-of-pyrimidine-derivative-schiff-base-dna-binding-antioxidant-antibacterial-and-in-vitro-anticancer-studies
#17
Nagaraj Revathi, Murugesan Sankarganesh, Jegathalaprathaban Rajesh, Jeyaraj Dhaveethu Raja
A new pyrimidine derivative Schiff base ligand (HL) [HL = 2-(4,6-dimethylpyrimidin-2-ylimino)methyl)-4-nitrophenol] and its metal(II) complexes [CuL2] (1), [CoL2] (2), [NiL2] (3) and [ZnL2] (4) have been synthesized and characterized by several spectral techniques. The square planar geometry of the complexes 1-4 confirmed by UV-Visible, ESR and EI-mass spectral techniques. DNA binding study of the complexes 1-4 with Calf Thymus (CT) DNA using absorption spectral titration at different pH (4.0, 7.0 & 10.0) have been scrutinized that the complexes 1-4 bound by groove binding mode with significant binding constant values (K b  = 5...
May 24, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28540582/novel-synthesis-and-characterization-of-pristine-cu-nanoparticles-for-the-non-enzymatic-glucose-biosensor
#18
T Dayakar, K Venkateswara Rao, K Bikshalu, V Rajendar, Si-Hyun Park
Non enzymatic electrochemical glucose sensing was developed based on pristine Cu Nanopartilces (NPs)/Glassy Carbon Electrode (GCE) which can be accomplished by simple green method via ocimum tenuiflorum leaf extract. Then, the affect of leaf extract addition on improving Structural, Optical and electrochemical properties of pristine cu NPs was investigated. The synthesized Cu NPs were characterized with X-ray diffraction (X-ray), Uv-Visible spectroscopy (Uv-Vis), Fourier transformation infrared spectroscopy (FTIR), Particle size distribution (PSA), Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDS), Transmission electron microscopy (TEM) for structural optical and morphological studies respectively...
July 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28540545/a-novel-bioelectrode-and-anaerobic-sludge-coupled-system-for-p-clnb-degradation-by-magnetite-nanoparticles-addition
#19
Xiangyang Xu, Xinyi Gao, Jie Jin, Julia Vidonish, Liang Zhu
A novel laboratory-scale bioelectrode and anaerobic sludge coupled system was established for the enhancement of p-chloronitrobenzenes (p-ClNB) reductive transformation with addition of magnetite nanoparticles. In this coupled system, the bioelectrodes were supplied with a voltage of 0.8 V and the amount of magnetite nanoparticles was set at 7.4 mL/400 mL. Results showed that high p-ClNB transformation rate of 0.284 h(-1) and high p-chloroaniline (p-ClAn) dechlorination rate of 0.082 h(-1) were achieved in the coupled system at p-ClNB initial concentration of 30 mg L(-1), and p-ClAn is one of the reductive products of p-ClNB...
May 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28537709/titanium-oxo-cluster-with-six-peripheral-ferrocene-units-and-its-photocurrent-response-properties-for-saccharides
#20
Jin-Le Hou, Wen Luo, Yao Guo, Ping Zhang, Shen Yang, Qin-Yu Zhu, Jie Dai
A unique titanium oxo cluster with a ferrocene ligand was synthesized and characterized by single crystal X-ray analysis. Six ferrocene carboxylates coordinate to a D3d Ti6O6 core to be a redox active cluster 1, [Ti6O6(O(i)Pr)6(O2CFc)6]. An analogue 2, [Ti6O6(O(i)Pr)6(O2C(i)Bu)6], where the redox active ferrocene group is replaced by isobutyrate, is also reported as a contrast. The six ferrocene moieties in 1 are structurally identical to give a main redox wave at E1/2 = 0.62 V in dichloromethane investigated by cyclic voltammetry...
May 24, 2017: Inorganic Chemistry
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