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Reference type: Journal
Authors: Mazzotta E, Malitesta C
Article Title: Preliminary Study on Electrosynthesis of a Co-Porphyrin Based Molecularly Imprinted Polymer for the Selective Detection of the Herbicide 2,4-Dichlorophenoxy Carboxylic Acid.
Publication date: 2008
Journal: Sensor Letters
Volume: 6
Issue: (4)
Page numbers: 618-622.
DOI: 10.1166/sl.2008.443

Abstract: This work represents the first attempt to the electrosynthesis of a molecularly imprinted polymer (MIP) employing a Co-porphyrin as monomer (Co(III)tetrakis o-aminophenyl porphyrin (CoTAPP)). UV-Vis spectroscopic studies were conducted to investigate interactions of the porphyrin with two toxic organohalides (4-(2,4-dichlorophenoxy) butyric acid (2,4-DB) and 2-(2,4-dichlorophenoxy) propionic acid (2,4-DP)). Binding constants of the complexes between CoTAPP and each organohalide was evaluated by Scatchard plots. Collected data evidenced a more significant interaction with 2-DB (K = 2.3 x 10(4) M-1) that was so selected as template. Cyclic voltammetry (CV) in homogeneous solution demonstrated the role of CoTAPP as catalyst in 2,4-DB reductive dechlorination. MIP was electropolymerized and electrochemically characterized by CV. The resulting polymer was then employed in the voltammetric detection of 2,4-DB at hundreds mu M concentration. A linear calibration curve was obtained in the concentration range 50-400 mu M (R = 0.9957). MIP showed a higher response than not-imprinted polymer (NIP), besides a good selectivity being able to reject a closely related compound (2,4-DP). The highest estimated ratio between MIP response to 2,4-DB and 2,4-DP (at the same concentration 600 mu m) was equal to 6.6
Template and target information: 2,4-dichlorophenoxy carboxylic acid, 2-(2,4-dichlorophenoxy) propionic acid, 2,4-DP, 4-(2,4-dichlorophenoxy) butyric acid, 2,4-DB
Author keywords: Co-Porphyrin Based Electrosynthesized Molecularly Imprinted Polymers, Metal ion coordination, electrochemical sensors

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