4.6 Article

Carbon Nano-Onion Peroxidase Composite Biosensor for Electrochemical Detection of 2,4-D and 2,4,5-T

期刊

APPLIED SCIENCES-BASEL
卷 11, 期 15, 页码 -

出版社

MDPI
DOI: 10.3390/app11156889

关键词

carbon nano-onion; peroxidase; phenoxy herbicide; 2; 4-D; 2; 4; 5-T; electrochemical biosensor; cyclodextrin

资金

  1. Ministerio de Economia y Competitividad, Spain [BIO2012-30936]
  2. Generalitat de Catalunya [2015FI_B00523]

向作者/读者索取更多资源

This study reported a biosensor based on carbon nano-onion modification for detecting phenoxy herbicides. The biosensor showed enhanced sensitivity and improved stability and repeatability in detecting 2,4-D and 2,4,5-T, with applications in soil and river water samples.
Featured Application Electrochemical detection of phenoxy herbicides based on peroxidase inhibition using a carbon nano-onion modified biosensor. Carbon nano-onions are emerging electrode materials in biosensing due to their high conductivity and biocompatibility. Phenoxy-based herbicides are a source of environmental contamination that can be detected using their property to inhibit the activity of some enzymes. Here we report a biosensor based on peroxidase immobilized on carbon nano-onions in a cyclodextrin polymer matrix for the amperometric detection of 2,4-D and 2,4,5-T. The inhibition mechanism of 2,4-D and 2,4,5-T on peroxidase activity was first elucidated by activity measurements and molecular docking. The biosensor was characterized by electrochemical and microscopy methods and applied to the amperometric detection of these herbicides. The incorporation of carbon nano-onions enhanced the sensitivity of the biosensor and improved its stability and repeatability. The application of the developed biosensor to the detection of 2,4-D in soil and 2,4,5-T in river water samples is also reported.

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