By Amadeo Rodríguez Fernández-Alba
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38] studied 97 pesticides in five matrices (tomato, pepper, zucchini, orange, and leek). Bromoxynil, terbacil, ioxynil, hexaflumuron, chlorfluazuron, orthophenylphenol, and famoxadone could not be detected by ESIþ, so they were analyzed in negative mode. Lacina et al.  applied a 212 pesticides database for the screening of different fruits and vegetables by UPLC–TOF-MS. Approximately 22% of those compounds were analyzed in negative mode. Other authors  employed the database to define automatic quantitation software parameters, but in this case, only three analytes were screened in negative mode.
38]. 12 TOF-MS within Food and Environmental Analysis accurate identification of the pesticides in the samples. This approach increased again the number of compounds automatically detected, especially at low concentration, since the matrix produced an ion suppression effect that decreased the response and thus the detectability of many compounds. An aspect that can cause major deviations in the accurate mass measurements is saturation of the detector, due to a high level of ions arriving at the detector.
1 Target Analysis Target analysis is based on looking for specific analytes or group of analytes and implies establishing a method prior to analysis. A list of selected compounds is usually prepared, based on issues such as the use of the pesticides, those frequently detected or those included in priority lists. Compounds are characterized during method development, and information is obtained for further identification and quantitation of these compounds in real samples. Identification is accomplished by accurate mass measurements of protonated molecules, in-source CID fragmentation, and retention time.
TOF-MS within food and environmental analysis by Amadeo Rodríguez Fernández-Alba