Document Detail


A new electron paramagnetic resonance method to identify irradiated soybean.
MedLine Citation:
PMID:  19799676     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Low-dose gamma irradiation causes minimal changes in food matrix making identification of radiation-processed foods a challenging task. In the present study, soybean samples were irradiated with commercially permitted gamma radiation dose in the 0.25 to 1.0 kGy range for insect disinfestations of food. Immediately after irradiation electron paramagnetic resonance (EPR) spectrum of the skin part of soybean showed a triplet signal (g = 2.0046, hyperfine coupling constant hfcc = 3.0 mT) superimposed on naturally present singlet. These signals were characterized as cellulose and phenoxyl radicals using EPR spectrum simulation technique. Kernel part of the samples exhibited a short-lived, radiation-induced singlet of carbon-centered radical superimposed on naturally present sextet signal of Mn2+. A detailed study on relaxation and thermal behavior of induced radicals in skin part was carried out using EPR spectroscopy. These findings revealed that progressive saturation and thermal characteristics of the induced radicals may be the most suitable parameters to distinguish soybean subjected to radiation dose as low as 0.25 kGy from thermally treated and nonirradiated samples, even after a prolonged period of storage.
Authors:
Bhaskar Sanyal; Arun Sharma
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of food science     Volume:  74     ISSN:  1750-3841     ISO Abbreviation:  J. Food Sci.     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-10-05     Completed Date:  2010-02-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0014052     Medline TA:  J Food Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  N57-64     Citation Subset:  IM    
Affiliation:
Food Technology Div., Bhabha Atomic Research Centre, Mumbai, India.
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MeSH Terms
Descriptor/Qualifier:
Biological Markers / analysis
Cellulose / analysis
Dose-Response Relationship, Radiation
Electron Spin Resonance Spectroscopy / methods*
Food Handling
Food Irradiation*
Kinetics
Organ Specificity
Phenols / analysis
Soybeans / chemistry,  radiation effects*
Temperature
Time Factors
Chemical
Reg. No./Substance:
0/Biological Markers; 0/Phenols; 3229-70-7/phenoxy radical; 9004-34-6/Cellulose

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


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