Document Detail

Investigation of decomposition products of microwave digestion of food samples.
MedLine Citation:
PMID:  7598216     Owner:  NLM     Status:  MEDLINE    
The involatile residues remaining after closed-vessel microwave digestion of various food samples, using nitric acid, with and without post-digestion treatment with hydrogen peroxide, have been studied. Decomposition products were found to include aliphatic and aromatic acids, nitro-compounds, oxalates and inorganic nitrates and phosphates. Measures of digestion completeness were provided by appearance, carbon content, infrared spectra and thin layer chromatograms of the residues, enabling a comparison of different digestion methods and sample types. Residual carbon levels varied linearly with the relative amounts of carboxylic acid and inorganic nitrate, as measured by infrared spectrometry of the residues. The formation of calcium oxalate was also a function of the degree of decomposition: the carboxylic acid: oxalate ratio increased in a logarithmic fashion with increasing residual carbon content. Particularly high levels of residual carbon from nitric acid digestion of milk powder, due largely to carboxylic acid residues, were substantially decreased by post-digestion treatment with hydrogen peroxide. However, nitrobenzoic acids, which proved major interferents in electrochemical analysis, were only removed by treatment with perchloric acid.
H J Reid; S Greenfield; T E Edmonds
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Analyst     Volume:  120     ISSN:  0003-2654     ISO Abbreviation:  Analyst     Publication Date:  1995 May 
Date Detail:
Created Date:  1995-08-01     Completed Date:  1995-08-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372652     Medline TA:  Analyst     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1543-8     Citation Subset:  IM    
Department of Chemistry, Loughborough University of Technology, Leicestershire, UK.
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MeSH Terms
Food / radiation effects*
Food Analysis / methods*

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