About: Phospholipids improve selectivity and sensitivity of carbon electrodes: Determination of pesticide Paraquat     Goto   Sponge   NotDistinct   Permalink

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  • Cyclic voltammetry and AC impedance spectroscopy were used for the investigation of properties and permeability of asolectin phospholipid layer and its influence on the voltammetric response of carbon electrodes. Permeability of the layer was tested using two electrochemically active compounds - paraquat as an example of lipophilic pesticide and copper sulphate as an example of hydrophilic substance. The phospholipid layer has suppressed the current response of copper ions effectively even in their large excess to paraquat. By contrast, the current response of lipophilic substance paraquat was almost unaffected by the phospholipid layer. As a result, the slope of calibration straightline for the copper ions was 14-times lower at the modified electrode than at bare electrode. On the contrary, the slope of calibration curve for paraquat was almost the same at modified electrode compared to bare electrode. Unmodified (CPE) and phospholipid modified (LMCPE) carbon paste electrode were applied to the determination of paraquat by adsorptive stripping differential pulse voltammetry. Detection limits 0.8 and 0.2 mu mol/L were obtained from the calibration dependencies for CPE and LMCPE, respectively. SPE was used for preconcentration of paraquat from model water samples and the recovery of the whole procedure was higher than 92%.
  • Cyclic voltammetry and AC impedance spectroscopy were used for the investigation of properties and permeability of asolectin phospholipid layer and its influence on the voltammetric response of carbon electrodes. Permeability of the layer was tested using two electrochemically active compounds - paraquat as an example of lipophilic pesticide and copper sulphate as an example of hydrophilic substance. The phospholipid layer has suppressed the current response of copper ions effectively even in their large excess to paraquat. By contrast, the current response of lipophilic substance paraquat was almost unaffected by the phospholipid layer. As a result, the slope of calibration straightline for the copper ions was 14-times lower at the modified electrode than at bare electrode. On the contrary, the slope of calibration curve for paraquat was almost the same at modified electrode compared to bare electrode. Unmodified (CPE) and phospholipid modified (LMCPE) carbon paste electrode were applied to the determination of paraquat by adsorptive stripping differential pulse voltammetry. Detection limits 0.8 and 0.2 mu mol/L were obtained from the calibration dependencies for CPE and LMCPE, respectively. SPE was used for preconcentration of paraquat from model water samples and the recovery of the whole procedure was higher than 92%. (en)
Title
  • Phospholipids improve selectivity and sensitivity of carbon electrodes: Determination of pesticide Paraquat
  • Phospholipids improve selectivity and sensitivity of carbon electrodes: Determination of pesticide Paraquat (en)
skos:prefLabel
  • Phospholipids improve selectivity and sensitivity of carbon electrodes: Determination of pesticide Paraquat
  • Phospholipids improve selectivity and sensitivity of carbon electrodes: Determination of pesticide Paraquat (en)
skos:notation
  • RIV/61989592:15310/14:33151651!RIV15-MSM-15310___
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(ED2.1.00/03.0058), P(GAP206/12/1150), S
http://linked.open...iv/cisloPeriodika
  • 9
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 36462
http://linked.open...ai/riv/idVysledku
  • RIV/61989592:15310/14:33151651
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • Voltammetry; Paraquat; Modified carbon electrodes; AC impedance spectroscopy; Asolectin (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • US - Spojené státy americké
http://linked.open...ontrolniKodProRIV
  • [B05517271F40]
http://linked.open...i/riv/nazevZdroje
  • European Journal of Lipid Science and Technology
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 116
http://linked.open...iv/tvurceVysledku
  • Barták, Petr
  • Skopalová, Jana
  • Součková, Jitka
  • Švecová, Hana
  • Labuda, Ján
  • Pyszková, Michaela
  • Svítková, Jana
http://linked.open...ain/vavai/riv/wos
  • 000343000600017
issn
  • 1438-7697
number of pages
http://bibframe.org/vocab/doi
  • 10.1002/ejlt.201300389
http://localhost/t...ganizacniJednotka
  • 15310
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