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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Jauhari, Darshika Prasad, Bhim Bali Tiwari, Mahavir Prasad |
| Description | Author Affiliation: Prasad BB ( Analytical Division, Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India. Electronic address: prof.bbpd@yahoo.com.); Jauhari D ( Analytical Division, Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India.); Tiwari MP ( Analytical Division, Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India.) |
| Abstract | A rapid, selective, and sensitive double-template imprinted polymer nanofilm-modified pencil graphite electrode was fabricated for the simultaneous analysis of phosphorus-containing amino acid-type herbicides (glyphosate and glufosinate) in soil and human serum samples. Since both herbicides respond overlapped oxidation peaks and only glyphosate is prone to nitrosation, n-nitroso glyphosate and glufosinate were used as templates for obtaining the well-resolved quantitative differential pulse anodic stripping voltammetric peaks on the proposed sensor. Toward sensor fabrication, a nano-structured polymer film was first grown directly on the electrode via initial immobilization of gold nanoparticles at its surface. This was followed by linking of monomeric (N-methacryloyl-l-cysteine) molecules through S-Au bonds. Subsequently, these molecules were subjected to free radical polymerization, in the presence of templates, cross linker, initiator, and multiwalled carbon nanotubes as pre-polymer mixture. The modified sensor observed wide linear ranges (3.98-176.23 ng mL(-1) and 0.54-3.96 ng mL(-1)) of simultaneous analysis with detection limits as low as 0.35 and 0.19 ng mL(-1) (S/N=3) for glyphosate and glufosinate, respectively, in aqueous samples. The respective oxidation peak potentials of both analytes were found to be substantially apart by 265 mV. This enabled the simultaneous determination of one target in the presence of other, without any cross reactivity, interferences, and false-positives, in real samples. |
| ISSN | 09565663 |
| Volume Number | 59 |
| e-ISSN | 18734235 |
| Journal | Biosensors and Bioelectronics |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-09-15 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Aminobutyrates Analysis Electrochemical Techniques Instrumentation Glycine Analogs & Derivatives Herbicides Molecular Imprinting Polymers Chemistry Blood Equipment Design Humans Limit Of Detection Nanostructures Soil Water Evaluation Studies Journal Article Research Support, Non-u.s. Gov't Discipline Biotechnology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology Medicine Biophysics Biomedical Engineering Biotechnology Electrochemistry |
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