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The Identification of Spiromesifen, a Recently Introduced Pesticide, Using Approaches to Chemical Unknown Analysis
Author(s) -
Wilson Donna K.,
Graff Cynthia L.
Publication year - 2013
Publication title -
journal of forensic sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.715
H-Index - 96
eISSN - 1556-4029
pISSN - 0022-1198
DOI - 10.1111/j.1556-4029.2012.02284.x
Subject(s) - mass spectrometry , infrared spectroscopy , mass spectrum , identification (biology) , analytical chemistry (journal) , chemistry , spectroscopy , infrared , matching (statistics) , chromatography , biological system , mathematics , physics , organic chemistry , optics , biology , statistics , botany , quantum mechanics
An unknown, viscous, opaque, white liquid with a strong, unpleasant odor was submitted with a request for identification. It was analyzed using infrared (IR) spectroscopy, gas chromatography–mass spectrometry, and X ‐ray fluorescence spectroscopy. It was found to contain glycerin as well as another compound. IR and mass spectral data were readily obtained for this second component, but it was not easily identified as common instrument libraries had no matching spectra. After an extensive literature search, the unknown compound was identified as spiromesifen, a recently introduced pesticide. The IR spectrum and electron impact mass spectrum of spiromesifen are presented here as these are not available in the published literature. This case report also provides useful approaches for searching for and identifying an unknown compound when it is not found in a laboratory's spectral libraries.