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Design of a Colorimetric Sensor Array Based on Aggregation of Gold Nanoparticles for Identification and Discrimination of Pesticides

Mirghafouri, Mohammad Reza | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54173 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Hormozinezhad, Mohammad Reza; Ghasemi, Forough
  7. Abstract:
  8. There is great attention in developing rapid and straightforward methods for the identification of various pesticides that are usually used simultaneously in agricultural products. It is due to the extensive use of a diverse class of pesticides in agricultural products and their high toxicity which causes serious diseases in the human body. In the current study, a non-enzymatic sensor array has been developed for the identification and discrimination of five different pesticides belong to diverse classes including organophosphate, carbamate, and bipyridylium. For this aim, gold nanoparticles with two different capping agents consisting of citrate and borohydride were used as sensing elements. The aggregation-induced spectra alterations of gold nanoparticles were utilized to identify the pesticides in a wide range of concentrations (20-5000 ng mL-1). We have employed data visualization methods (i.e., heat maps, bar plots, and color difference maps) and a supervised pattern recognition method (i.e., linear discrimination analysis) for analysis. The result of linear discrimination analysis showed that these five pesticides with concentrations of 60, 80, 100, 200, 400, 600, 800 and 1000 ng mL-1, three times repetition and 100% classification accuracy are distinguished in three dimensions and five categories. Finally, the practical applicability of the developed sensor array has been evaluated for the identification of target pesticides in the lime peel. The outcomes revealed that the probe could accurately verify the absence/presence of the pesticides in lime fruit
  9. Keywords:
  10. Pesticide ; Colorimetric ; Gold Nanoparticle ; Eye Detection ; Colorimetric Sensor Array

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