Document Detail


Determination of dithiocarbamate fungicide residues in food by a spectrophotometric method using a vertical disulfide reaction system.
MedLine Citation:
PMID:  11599982     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Dithiocarbamates are a class of fungicides extensively used in many crops worldwide. The current residue definition of dithiocarbamates in food for compliance with maximum residue limits, at national and international levels, is total residues arising from the use of any or each dithiocarbamate fungicide, determined as CS(2). The analytical method most frequently used to analyze dithiocarbamate residues in food for monitoring purposes was proposed more than 30 years ago. In this method, total dithiocarbamates are decomposed to CS(2), which is purified and reacted with a cupric reagent. The yellow complex formed is quantified by spectrophotometry. In this paper, a new reaction system for the purification and complexation of CS(2) is proposed. The new system is less fragile than the traditional design, is easier to assemble, and allows for a higher sample throughput, in addition to being of low cost. Recovery of added mancozeb, thiram, or ziram (0.15-8.0 mg/kg) in rice, beans, apple, banana, orange, papaya, tomato, cucumber, and potato ranged from 82 to 120%, with relative standard deviations from 0 to 10% (n = 3 or 5). Analysis of apple, tomato, and papaya samples with field-incurred dithiocarbamate residues showed comparable results using both the traditional and the new reaction systems.
Authors:
E D Caldas; M H Conceição; M C Miranda; L C de Souza; J F Lima
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  49     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2001 Oct 
Date Detail:
Created Date:  2001-10-15     Completed Date:  2001-12-05     Revised Date:  2002-11-01    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4521-5     Citation Subset:  IM    
Affiliation:
College of Health Sciences and Chemistry Institute, University of Brasília, 70919-970 Brasília, DF, Brazil. eloisa@unb.br
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MeSH Terms
Descriptor/Qualifier:
Disulfides / chemistry*
Ethylenebis(dithiocarbamates) / analysis*
Fabaceae / chemistry
Food Analysis / methods*
Fruit / chemistry
Fungicides, Industrial / analysis*
Oryza sativa / chemistry
Pesticide Residues / analysis*
Spectrophotometry / methods*
Vegetables / chemistry
Chemical
Reg. No./Substance:
0/Disulfides; 0/Ethylenebis(dithiocarbamates); 0/Fungicides, Industrial; 0/Pesticide Residues

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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