Document Detail

Phosphite additives and their transformation products in polyethylene packaging for gamma-irradiation.
MedLine Citation:
PMID:  11407757     Owner:  NLM     Status:  MEDLINE    
Infrared (IR) spectroscopy has been used to identify and quantify the phosphite antioxidant, tris(2,4-di-tert.butylphenyl) phosphite, and its corresponding phosphate in high density polyethylene (HDPE) food trays, both in the original, commercial trays and also as a function of gamma-irradiation and post-irradiation, storage conditions. This direct method of inhibitor analysis complements time-consuming (some times non-quantitative) extraction methods, which for organo-phosphites are complicated by their facile conversion to phosphates by peroxidic impurities in the solvent. Because of the complete destruction of phosphite to give mainly phosphate at quite low gamma-irradiation doses (approximately 5 kGy) and phosphate formation during melt processing and radiation sterilization of these HDPE trays must take into account products from the irradiation of phosphate. Any residual phosphite is lost progressively in post-irradiation reactions, which are complex, producing a less than-quantitative yield of phosphate.
D J Carlsson; M E Krzymien; L Deschênes; M Mercier; C Vachon
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Food additives and contaminants     Volume:  18     ISSN:  0265-203X     ISO Abbreviation:  Food Addit Contam     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-06-15     Completed Date:  2001-06-28     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8500474     Medline TA:  Food Addit Contam     Country:  England    
Other Details:
Languages:  eng     Pagination:  581-91     Citation Subset:  IM    
National Research Council of Canada (ICPET), Ottawa, Ontario.
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MeSH Terms
Chromatography, High Pressure Liquid
Food Irradiation*
Food Packaging*
Gamma Rays*
Phosphites / chemistry,  radiation effects*
Spectroscopy, Fourier Transform Infrared / methods
Reg. No./Substance:
0/Phosphites; 9002-88-4/Polyethylene

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

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