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Selective colorimetric detection of pentaerythritol tetranitrate (PETN) using arginine-mediated aggregation of gold nanoparticles

Taefi, Z ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.saa.2019.117803
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. Detection of pentaerythritol tetranitrate (PETN) as an explosive has been of great interest because of public safety and military concerns. Here, we have presented a simple, selective and sensitive colorimetric method for direct detection of PETN. The gold nanoparticles (AuNPs) were first exposed to arginine which has primary amines in its structure. Electron deficient –NH2 groups from arginine could strongly interact with –NO2 groups of PETN as electron donors. Hydrogen bonding happens between the –NO2 group of PETN and –NH2 group of arginine molecules. Therefore, selective aggregation of AuNPs happened because of the donor-acceptor and hydrogen bonding interactions. Due to the aggregation, the color of reddish AuNPs turned to blue or purple depend on PETN concentration. A good linear relationship was achieved between the aggregation signal (absorbance ratio of A650/A520) of the probe and the concentration of PETN with a limit of detection of 0.169 μmol L− 1. Furthermore, we have found that the developed probe can detect PETN in complex matrices of groundwater and soil samples. © 2019 Elsevier B.V
  6. Keywords:
  7. Aggregation ; Arginine ; Colorimetric detection ; Gold nanoparticles ; Pentaerythritol tetranitrate ; Agglomeration ; Amines ; Color ; Colorimetry ; Explosives detection ; Fiber optic sensors ; Gold compounds ; Groundwater ; Hydrogen ; Hydrogen bonds ; Metal nanoparticles ; Nitrogen oxides ; Probes ; Colorimetric methods ; Electron-deficient ; Hydrogen bonding interactions ; Limit of detection ; Linear relationships ; Selective aggregation ; Explosives ; metal nanoparticle ; Pentaerythrityl tetranitrate ; Chemistry ; Arginine ; Gold
  8. Source: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy ; Volume 228 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S138614251931193X