Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 389, Issue 6, Pages 1755-1763Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-007-1412-y
Keywords
pesticides; Comprehensive two-dimensional gas; chromatography; GC x GC; Rapid scanning quadrupole mass spectrometry; Red grapefruit
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The present research is focused on the development of a comprehensive two-dimensional gas chromatography-rapid scanning quadrupole mass spectrometric (GC x GC-qMS) methodology for the analysis of trace-amount pesticides contained in a complex real-world sample. Reliable peak assignment was carried out by using a recently developed, dedicated pesticide MS library (for comprehensive GC analysis), characterized by a twin-filter search procedure, the first based on a minimum degree of spectral similarity and the second on the interactive use of linear retention indices (LRI). The library was constructed by subjecting mixtures of commonly used pesticides to GC x GC-qMS analysis and then deriving their pure mass spectra and LRI values. In order to verify the effectiveness of the approach, a pesticide-contaminated red grapefruit extract was analysed. The certainty of peak assignment was attained by exploiting both the enhanced separation power of dual-oven GC x GC and the highly effective search procedure.
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