Download Mass spectrometry for the analysis of pesticide residues and by Despina Tsipi, Helen Botitsi, Anastasios Economou PDF

By Despina Tsipi, Helen Botitsi, Anastasios Economou

Presents an outline of using mass spectrometry (MS) for the research of pesticide residues and their metabolites.

  • Presents nation of the-art MS thoughts for the id of insecticides and their transformation items in foodstuff and environment
  • Covers very important advances in MS ideas together with MS instrumentation and chromatographic separations (e.g. UPLC, HILIC, complete GCxGC) and applications
  • Illustrates the most pattern training thoughts (SPE, QuEChERS, microextraction) utilized in blend with MS for the research of pesticides
  • Describes a variety of proven and new ionization recommendations in addition to the most MS structures, software program instruments and mass spectral libraries

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Additional resources for Mass spectrometry for the analysis of pesticide residues and their metabolites

Example text

1 MRLs for Processed Food Changes to the levels and nature of residues in food can be also affected by 20 Pesticide Chemistry and Risk Assessment processing practices for food production. For example, fat‐ soluble pesticides tend to partition into the oil when oilseeds are processed. Water‐soluble residues in grape have a higher possibility to reach wine than the water‐insoluble compounds. The laboratory experiments on food processing studies can simulate the real commercial processing practices and evaluate the processing factors (PF) of pesticides.

Dissolved organic matter (DOM) is acting as a photosensitizer in indirect photodegradation of pesticides within aquatic systems, producing oxidants such as hydrated electrons and singlet oxygen (1O2), superoxide radical anion (•O2−), hydroxyl radicals (•OH), hydrogen peroxide (H2O2), carbonate radical (•CO3−), and alkyl peroxy radicals (ROO•) (Katagi, 2004, Remucal, 2014). Likewise, naturally occurring nitrate ions (NO3−), nitrite, H2O2, and iron in surface water may serve as a primary source for sunlight‐induced hydroxyl radical production involved in the phototransformation of pesticides (Vaughan and Blough, 1998).

Several pesticide metabolites have been identified in food matrices using mass spectrometric techniques with low‐ and high‐resolution mass analyzers. , 2009, Soler and Picó, 2007). 2 Environmental Fate The fate of pesticides in the environment, mainly in water and soil, depends on their physicochemical properties, on their vulnerability to various transformation and transport processes, and on environmental conditions, biota, water composition, and soil and sediment characteristics. Transformation pathways of pesticides can be biotic—aerobic and anaerobic metabolism—or abiotic occurring through reactions such as hydrolysis, photolysis, oxidation, and/or reduction.

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