| Pesticide residue analysis in foodstuffs applying capillary gas chromatography with atomic emission detection state-of-the-art use of modified multimethod S19 of the Deutsche forschungsgemeinschaft and automated large-volume injection with programmed-temperature vaporization and solvent venting. | |
| | |
MedLine Citation:
|
PMID: 8938393 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Atomic emission detection (AED) provides high element-specific detection of all compounds amenable to gas chromatography (GC). The heteroatoms nitrogen, chlorine, phosphorus, sulfur, bromine and fluorine, which are important elements in pesticide residue analysis, are of major interest. A main drawback of AED is its lower sensitivity with respect to other selective detection methods used in pesticide residue analysis such as electron-capture and nitrogen-phosphorus detection. This holds true especially for the important nitrogen trace. For this reason, more sensitive detection can be achieved by injection of larger volumes or higher concentrations of sample extracts, because matrix compounds were usually registered only in the carbon, hydrogen and oxygen traces. This paper focuses on recent developments from the authors' laboratory in order to demonstrate the feasibility of screening analyses with the identification of pesticide residues down to the 0.01 ppm concentration level in plant foodstuffs. This has been achieved by means of automated large volume injection with programmed-temperature vaporization and solvent venting as well as careful optimization of make-up and reactant gases with AED. Clean up follows the principle of multimethod S19 of the Deutsche Forschungsgemeinschaft in a reduced procedure. After elimination of lipids and waxes by gel permeation chromatography, extracts from 10 g of the food samples were concentrated to 200 microliters, of which 12.5 microliters were introduced into the GC-AED system. Two analyses were usually performed with the element traces of sulfur, phosphorus, nitrogen and carbon in the first run and chlorine and bromine in the second run. Fluorine and oxygen were not detected in any screening analyses. The method has proved to be of great value especially with "problem foodstuffs". The limits of detection were determined for 385 pesticides and are presented together with their retention data. |
| | |
Authors:
|
H J Stan; M Linkerhägner |
Related Documents
:
|
10805233 - Occurrence of sulfonylurea, sulfonamide, imidazolinone, and other herbicides in rivers,... 10335613 - Automated one-step supercritical fluid extraction and clean-up system for the analysis ... 22019263 - Integral valorization of leucaena diversifolia by hydrothermal and pulp processing. |
Publication Detail:
|
Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Review |
Journal Detail:
|
Title: Journal of chromatography. A Volume: 750 ISSN: 0021-9673 ISO Abbreviation: J Chromatogr A Publication Date: 1996 Oct |
Date Detail:
|
Created Date: 1997-01-15 Completed Date: 1997-01-15 Revised Date: 2009-01-15 |
Medline Journal Info:
|
Nlm Unique ID: 9318488 Medline TA: J Chromatogr A Country: NETHERLANDS |
Other Details:
|
Languages: eng Pagination: 369-90 Citation Subset: IM |
Affiliation:
|
Technical University Berlin, Institute of Food Chemistry, Germany. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Chromatography, Gas
/
methods* Food Analysis / methods* Osmolar Concentration Pesticide Residues / analysis*, chemistry, metabolism Reproducibility of Results Sensitivity and Specificity Silicon Dioxide / chemistry Solvents / chemistry Temperature Volatilization |
| Chemical | |
Reg. No./Substance:
|
0/Pesticide Residues; 0/Solvents; 7631-86-9/Silicon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: On-line high-performance liquid chromatography-solvent evaporation-high-performance liquid chromatog...
Next Document: Extraction of maleic hydrazide residues from potato crisps and their determination using high-perfor...