Document Detail

Investigation of foreign substances in food.
MedLine Citation:
PMID:  11272336     Owner:  NLM     Status:  MEDLINE    
Scanning electron microscopy (SEM) together with energy-dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) were used to investigate foreign substances from seven categories of foreign substances in food. (1) Naturally occurring foreign substances--Using FTIR, a foreign substance was identified as a natural resin probably from the product. (2) Foreign substances introduced during food processing. Scanning electron microscopy-EDS was used to identify a foreign material found on surf clams as calcium phosphate from a product/ingredient interaction. Using SEM-EDS, a crystalline material in a meat product was identified as calcium salts of chloride and phosphate. Fourier transform infrared spectroscopy was used to identify foreign material that clogged an aerosol valve as chipboard. Using SEM-EDS, the metal in the heel of a glass bottle was identified as copper sulfide-containing metal inclusion. (3) Insects, reptiles, and rodents--Scanning electron microscopy was used to determine that a mouse found in food was not processed with the food, but entered the container after it left the factory. (4) Glass fragments--Glass from various sources can be distinguished from one another using SEM-EDS either by the level of the major elements in glass or by the presence of elements in one glass, but not in another. (5) Glass-like particles--Using SEM-EDS, glass-like particles found on beets were determined to be a fatty acid. (6) Metal foreign objects--Using SEM-EDS, metals from a variety of sources can be easily distinguished. For example, a tin-soldered container can be distinguished from a lead-soldered can. Using SEM-EDS, the metal fiber found on the bottom of a two-piece can likely enter the can during the final stage of the manufacture of the drawn and ironed food can. (7) Drug capsule identification--Fourier transform infrared spectroscopy was used to determine that a pill found in food was ibuprofen.
J E Charbonneau
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Scanning     Volume:  23     ISSN:  0161-0457     ISO Abbreviation:  Scanning     Publication Date:    2001 Jan-Feb
Date Detail:
Created Date:  2001-02-22     Completed Date:  2001-03-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7903371     Medline TA:  Scanning     Country:  United States    
Other Details:
Languages:  eng     Pagination:  51-7     Citation Subset:  IM    
National Food Processors Association, CDRPNT-Packaging, Washington, DC 20005, USA.
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MeSH Terms
Food Contamination / analysis*
Forelimb / ultrastructure
Glass / analysis
Ibuprofen / analysis
Metals / analysis
Microscopy, Electron, Scanning*
Resins, Plant / analysis
Spectrometry, X-Ray Emission*
Spectroscopy, Fourier Transform Infrared*
Reg. No./Substance:
0/Metals; 0/Resins, Plant; 15687-27-1/Ibuprofen

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

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