Abstract
Five amines were reacted with trifluoroacetic anhydride (TFAA) as derivatization reagent and subsequently analyzed via 19F nuclear magnetic resonance (NMR) spectroscopy. The 19F-NMR spectra of derivatives of aniline, 2,4-dimethyl aniline, and 2-methoxy aniline produce a signal that are very close to TFAA. The peaks resulting from the reaction of TFAA with N-ethyl aniline and N-methyl aniline are shifted much farther downfield than any of the other signals. Optimal 19F-NMR sensitivity based upon T 1 relaxation time was investigated for derivatization compound and flurbiprofen as internal standard in toluene. The calibration curve was linear for amines over the range of 9.0–100.0 mg L−1, with detection limit (S/N = 3) of 2.6–2.9 mg L−1. Solid-phase extraction cartridges were investigated for preconcentration of water samples. The method was validated through spike and recovery for secondary amines from tap water sample.
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Sarkouhi, M., Hassan, J. & Shamsipur, M. 19F-NMR Analysis of Primary and Secondary Amines Following Chemical Derivatization with Trifluoroacetic Anhydride. Appl Magn Reson 43, 377–384 (2012). https://doi.org/10.1007/s00723-012-0342-9
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DOI: https://doi.org/10.1007/s00723-012-0342-9