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  • Title: Studies of pesticides by collision-induced dissociation, postsource-decay, matrix-assisted laser desorption/ionization time of flight mass spectrometry.
    Author: Cheng Y, Hercules DM.
    Journal: J Am Soc Mass Spectrom; 2001 May; 12(5):590-8. PubMed ID: 11349957.
    Abstract:
    The use of collision-induced dissociation, postsource decay (CID-PSD) matrix-assisted laser desorption/ionization (MALDI) mass spectrometry for the analysis of small organic molecules is demonstrated. Three pesticides: paraquat, diquat, and difenzoquat were chosen for this study. The matrices 2,5-dihydroxybenzoic acid (DHB), alpha-cyano-4-hydroxycinnamic acid (alpha-CHCA), and sinapinic acid (SA) were selected to investigate the effect of the matrix on the CID-PSD MALDI spectra of these molecules. Alpha-CHCA and DHB were found to be appropriate matrices for the pesticides studied. Spectra for a given pesticide obtained from different matrices were compared with each other, and the differences between them are discussed. A comparison of CID-PSD MALDI with fast-atom bombardment MS/MS spectra is presented; the agreement of pesticide fragmentation patterns between the two methods indicates that CID-PSD MALDI MS is a reliable and efficient technique for structural elucidation of small molecules.
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