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NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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Mass Spectrometry of Amines01:15

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In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule; a molecule with an odd number of nitrogen atoms produces a molecular ion with an odd molecular weight. Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit strong molecular ion peaks, but acyclic...
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Lignin-Based Nanostructured Sensor for Selective Detection of Volatile Amines at Trace Levels.

Paolo Papa1, Giuseppina Luciani2, Rossella Grappa2

  • 1Institute of Atmospheric Pollution Research (IIA) of National Research Council (CNR), Montelibretti, 00010 Rome, Italy.

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|September 19, 2025
PubMed
Summary

This study presents a novel sensor using lignin nanoparticles and polylactic acid fibers for detecting amine vapors like dimethylamine. The advanced nanostructure offers high sensitivity and selectivity for environmental and safety monitoring.

Keywords:
VOCs sensoramine sensingdimethylamineelectrospinninglignin nanoparticlespolylactic acidselective sensor

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Volatile amines pose risks in environmental, industrial, and healthcare settings.
  • Existing detection methods often lack selectivity, sensitivity, or real-time capabilities.
  • Lignin and polylactic acid offer biocompatible and functional platforms for sensor development.

Purpose of the Study:

  • To develop a nanostructured sensing platform for selective volatile amine detection.
  • To integrate gold-decorated lignin nanoparticles (AuLNPs) with electrospun polylactic acid (PLA) fibers.
  • To investigate the sensor's performance, including selectivity, sensitivity, and the influence of relative humidity.

Main Methods:

  • Fabrication of a composite material using electrospun PLA nanofibres and AuLNPs.
  • Characterization of the composite material's surface morphology and chemical properties.
  • Testing the sensor's response to various amine vapors, including dimethylamine (DMA), under different relative humidity (RH) conditions.

Main Results:

  • The AuLNP/PLA composite exhibited selective adsorption of amine vapors, with a strong affinity for DMA.
  • A limit of detection (LOD) of approximately 440 ppb for DMA was achieved.
  • Relative humidity significantly influenced sensor performance by facilitating amine protonation, enhancing detection.

Conclusions:

  • The developed nanostructured sensor demonstrates high selectivity, sensitivity, and reproducibility for amine detection.
  • The integration of AuLNPs and lignin into PLA fibers creates a promising sensing platform.
  • The sensor holds potential for real-time monitoring applications in environmental, industrial safety, and healthcare diagnostics.