An Immobilized Acetylcholinesterase Flow-Injection Conductimetric System for the Determination of Paraoxon.

• RODRIGUES Tereza Cristina

  Universidade Federal de Uberlândia

• TUBINO Matthieu

  Instituto de Quimica, Universidade Estadual de Campinas

• GODINHO Oswaldo E. S.

  Centro Tecnológico, Univ. Fed.

• NETO Graciliano de Oliveira

  Instituto de Quimica, Universidade Estadual de Campinas

Bibliographic Information

Other Title

• Immobilized Acetylcholinesterase Flow-I
• An Immobilized Acetylcholinesterase Flow-Injection Conductimetric System for the Determination of Paraoxon Tereza

Abstract

A flow-injection conductimetric system procedure is proposed for the determination of paraoxon. The method is based on the inhibition of immobilized acetylcholinesterase in controlled porous glass beads (CPG) with acetylcholine as substrate. The enzymatic reaction is inhibited by a diethyl-p-nitrophenylphosphate (paraoxon) solution. A 1, 1′-trimethylene-bis(4-formylpyridinium bromide)dioxime solution was used to reactivate the enzyme. The correlation between the peak height, for a given acetylcholine concentration, is linear from 1.0×10^-7 to 5.0×10^-5mol l^-1 of paraoxon; therefore, the quantitative limit of detection was about 1.0×10^-7mol l^-1 of paraoxon. For semi-quantitative purposes, the limit can be considered to be about 1.0×10^-8mol l^-1. The relative estimated standard deviation obtained using a 1.0×10^-3mol l^-1 acetylcholine solution and a 5.0×10^-6mol l^-1 paraoxon solution was 2.2% (n=8).

Journal

• Analytical Sciences

  Analytical Sciences 13 (3), 423-427, 1997

  The Japan Society for Analytical Chemistry

Keywords

• Pesticide
• acetylcholinesterase
• acetylcholine
• conductimetry
• flow-injection
• paraoxon

Details

• CRID: 1390001204252480384
• NII Article ID: 130003416633
• NII Article ID: 10002411691
• NII Book ID: AA10500785
• DOI: 10.2116/analsci.13.423
• COI: 1:CAS:528:DyaK2sXjvFSrtbo%3D
• ISSN: 13482246
• ISSN: 09106340
• NDL BIB ID: 4231293
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4231293
• Web Site: https://link.springer.com/content/pdf/10.2116/analsci.13.423.pdf
• Web Site: https://link.springer.com/article/10.2116/analsci.13.423/fulltext.html
• Web Site: http://www.jstage.jst.go.jp/article/analsci1985/13/3/13_3_423/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed