Electrochemical Degradation of Triketone Herbicides and Identification of Their Main Degradation Products

2015 ◽  
Vol 43 (7) ◽  
pp. 1093-1099 ◽  
Author(s):  
Milica Jović ◽  
Dragan Manojlović ◽  
Dalibor Stanković ◽  
Uroš Gašić ◽  
Dejan Jeremić ◽  
...  
Keyword(s):  
Degradation Products ◽  
Electrochemical Degradation ◽  
Triketone Herbicides

scholarly journals Atrazine, triketone herbicides, and their degradation products in sediment, soil and surface water samples in Poland

2016 ◽  
Vol 24 (1) ◽  
pp. 644-658 ◽  
Author(s):  
Hanna Barchanska ◽  
Marcin Sajdak ◽  
Kornelia Szczypka ◽  
Angelika Swientek ◽  
Martyna Tworek ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Samples ◽  
Degradation Products ◽  
Surface Water Samples ◽  
Triketone Herbicides

scholarly journals Electrochemical degradation of the antibiotic ciprofloxacin in a flow reactor using distinct BDD anodes: Reaction kinetics, identification and toxicity of the degradation products

Chemosphere ◽  
2019 ◽  
Vol 234 ◽  
pp. 461-470 ◽  
Author(s):  
Naihara Wachter ◽  
José Mario Aquino ◽  
Marina Denadai ◽  
Juliana C. Barreiro ◽  
Adilson José Silva ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Flow Reactor ◽  
Degradation Products ◽  
Electrochemical Degradation ◽  
Bdd Anodes

scholarly journals Electrochemical degradation of aqueous alachlor and atrazine: products identification, lipophilicity, and ecotoxicity

2019 ◽  
Vol 44 (1SI) ◽  
pp. 12
Author(s):  
Rafaely Ximenes de Sousa Furtado ◽  
Eduardo Bessa Azevedo ◽  
Artur De Jesus Motheo
Keyword(s):  
Mass Spectrometry ◽  
Degradation Products ◽  
Filter Press ◽  
Trophic Levels ◽  
Electrochemical Degradation ◽  
Pollution Potential ◽  
Operational Conditions ◽  
Nacl Concentration ◽  
Initial Ph ◽  
32 Factorial Design

This work studied the electrochemical degradation of alachlor and atrazine (alone and mixed with each other) using a filter-press cell, a dimensionally stable anode (DSA Ti/Ru0.3Ti0.7O2), initial pH 3.0, and temperature at 25 °C. The best operational conditions for alachlor (0.33 mmol L-1) degradation were obtained by a 32 factorial design, in which the factors/levels were: NaCl concentration (0.05, 0.1, and 0.15 mol L-1) and current density (10, 30, and 50 mA cm-2). Thus, 93.1% alachlor removal and 71.2% mineralization were achieved using 0.15 mol L-1 NaCl and 30 mA cm-2. In addition, the initial degradation products (DPs) of alachlor and atrazine were identified by liquid chromatography coupled to mass spectrometry (LC-MS). Acute and chronic ecotoxicities for three trophic levels (fishes, daphnids and green algae) and lipophilicity (log D, pH 7.4) of the DPs were also estimated using the ECOSAR 1.11 and ChemAxon Calculator software, respectively. The present study showed that the electrochemical degradation is an efficient method for removing the herbicides alachlor and atrazine from water and that the DPs formed have lower pollution potential than their original compounds.

scholarly journals Online Monitoring of Electrochemical Degradation of Paracetamol through a Biomimetic Sensor

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Mariana Calora Quintino de Oliveira ◽  
Marcos Roberto de Vasconcelos Lanza ◽  
José Luis Paz Jara ◽  
Maria Del Pilar Taboada Sotomayor
Keyword(s):  
Liquid Chromatography ◽  
Flow Injection Analysis ◽  
Online Monitoring ◽  
Degradation Products ◽  
Process Efficiency ◽  
Carbon Electrode ◽  
Electrochemical Degradation ◽  
First Time ◽  
Line Analysis ◽  
Biomimetic Sensor

This paper reports, for the first time, the online monitoring to the electrochemical degradation of the paracetamol using a biomimetic sensor coupled to a Flow Injection Analysis (FIA) system. The electrochemical degradation of the drug was carried out in aqueous medium using a flow-by reactor with a DSA anode. The process efficiency was monitored at real time by the biomimetic sensor constructed by modifying a glassy carbon electrode with a Nafion membrane doped with iron tetrapyridinoporphyrazine (FeTPyPz). Simultaneously, we carried out off-line analysis by liquid chromatography (HPLC) during the experiments in order to validate the proposed system. In addition, to investigate the degradation products of the paracetamol electrolysis, we used the techniques of UPLC/MS and GC/MS.

scholarly journals Investigation of forced and total degradation products of amlodipine besylate by liquid chromatography and liquid chromatography-mass spectrometry

2014 ◽  
Vol 20 (2) ◽  
pp. 295-304 ◽  
Author(s):  
Zora Stoiljkovic ◽  
Milka Jadranin ◽  
Svetlana Djuric ◽  
Slobodan Petrovic ◽  
Avramov Ivic ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Degradation Products ◽  
Chemical Oxidation ◽  
Reversed Phase ◽  
Mass Spectrometry Analysis ◽  
Molecular Formula ◽  
Electrochemical Degradation ◽  
Amlodipine Besylate ◽  
Spectrometry Analysis

An isocratic, reversed-phase liquid chromatographic method was applied for the investigation of the degradation products of amlodipine besylate under the stressed conditions in solution. Amlodipine besylate stock solutions were subjected to acid and alkali hydrolysis, chemical oxidation and photodegradation as well as to the electrochemical degradation by cyclic voltammetry in 0.05 mol/L NaHCO3 on gold electrode. The total degradation of amlodipine besylate was achieved in 5 mol/L NaOH at 80?C for 6 h and the compound with molecular formula C15H16NOCl was identified as a main degradation product. Under acidic (5 mol/L HCl at 80?C for 6 h) stress conditions 75.2% of amlodipine besylate degradation was recorded. Oxidative degradation in the solution of 3% H2O2-methanol 80:20 at 80?C for 6 h showed that amlodipine besylate degraded to 80.1%. After 14 days of expose in photostability chamber amlodipine besylate solution showed degradation of 32.2%. In electrochemical degradation after 9 hours of cyclization the beginning of amlodipine oxidation was shifted for 200 mV to more negative potentials, with the degradation of 66.5%. Mass spectrometry analysis confirmed the presence of dehydro amlodipine derivate with molecular formula C20H23N2O5Cl in oxidative and acidic conditions while in electrochemical degradation was detected in traces.

Collagen degradation products modulate matrix metalloproteinase expression in cultured articular chondrocytes

2005 ◽  
Vol 24 (1) ◽  
pp. 63-70 ◽  
Author(s):  
M. Fichter ◽  
U. Körner ◽  
J. Schömburg ◽  
L. Jennings ◽  
A. A. Cole ◽  
...  
Keyword(s):  
Matrix Metalloproteinase ◽  
Articular Chondrocytes ◽  
Degradation Products ◽  
Collagen Degradation ◽  
Collagen Degradation Products

Structural Studies of Fibrinolysis by Electron and Light Microscopy

1999 ◽  
Vol 82 (08) ◽  
pp. 277-282 ◽  
Author(s):  
Yuri Veklich ◽  
Jean-Philippe Collet ◽  
Charles Francis ◽  
John W. Weisel
Keyword(s):  
Electron Microscopy ◽  
Light Microscopy ◽  
Plasminogen Activator ◽  
Structural Changes ◽  
Molecular Mechanisms ◽  
Degradation Products ◽  
Molecular Model ◽  
Three Dimensional ◽  
Tissue Type ◽  
Type Plasminogen Activator

IntroductionMuch is known about the fibrinolytic system that converts fibrin-bound plasminogen to the active protease, plasmin, using plasminogen activators, such as tissue-type plasminogen activator (t-PA) and urokinase-type plasminogen activator. Plasmin then cleaves fibrin at specific sites and generates soluble fragments, many of which have been characterized, providing the basis for a molecular model of the polypeptide chain degradation.1-3 Soluble degradation products of fibrin have also been characterized by transmission electron microscopy, yielding a model for their structure.4 Moreover, high resolution, three-dimensional structures of certain fibrinogen fragments has provided a wealth of information that may be useful in understanding how various proteins bind to fibrin and the overall process of fibrinolysis (Doolittle, this volume).5,6 Both the rate of fibrinolysis and the structures of soluble derivatives are determined in part by the fibrin network structure itself. Furthermore, the activation of plasminogen by t-PA is accelerated by the conversion of fibrinogen to fibrin, and this reaction is also affected by the structure of the fibrin. For example, clots made of thin fibers have a decreased rate of conversion of plasminogen to plasmin by t-PA, and they generally are lysed more slowly than clots composed of thick fibers.7-9 Under other conditions, however, clots made of thin fibers may be lysed more rapidly.10 In addition, fibrin clots composed of abnormally thin fibers formed from certain dysfibrinogens display decreased plasminogen binding and a lower rate of fibrinolysis.11-13 Therefore, our increasing knowledge of various dysfibrinogenemias will aid our understanding of mechanisms of fibrinolysis (Matsuda, this volume).14,15 To account for these diverse observations and more fully understand the molecular basis of fibrinolysis, more knowledge of the physical changes in the fibrin matrix that precede solubilization is required. In this report, we summarize recent experiments utilizing transmission and scanning electron microscopy and confocal light microscopy to provide information about the structural changes occurring in polymerized fibrin during fibrinolysis. Many of the results of these experiments were unexpected and suggest some aspects of potential molecular mechanisms of fibrinolysis, which will also be described here.

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