Document Detail


Study of photostimulated- and thermo-luminescence characteristics for detecting irradiated kiwifruit.
MedLine Citation:
PMID:  18247533     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Photostimulated luminescence (PSL) and thermo-luminescence (TL) analyses were conducted to detect irradiated kiwifruits. Samples were irradiated with Co-60 gamma-rays at 0-2 kGy. The freeze-dried kiwifruit peel showed 309 photon counts (PCs) for nonirradiated samples that accounted for less than the lower threshold value (700 counts/60 s, negative) and above 9306 PCs for 1 and 2 kGy-irradiated samples, which was higher than the upper threshold value (5000 counts/60 s, positive). However, PSL signals of irradiated samples remarkably decreased after 6 weeks of storage. The TL measurement using minerals isolated from the whole kiwifruit surface revealed a glow curve (TL 1) with a low intensity at 200-300 degrees C in nonirradiated samples but with a higher intensity at around 180 degrees C in irradiated samples at 1 kGy or more. The TL ratios, integrated areas of TL 1/TL 2 that was measured after 1 kGy re-irradiation for the TL 1-tested minerals, were less than 0.1 in nonirradiated samples and higher than 0.1 in irradiated ones and could verify TL 1 results. The inorganic dust minerals used were mainly composed of feldspar and quartz.
Authors:
Deokjo Jo; Byeong-Keun Kim; Tusneem Kausar; Joong-Ho Kwon
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Publication Detail:
Type:  Journal Article     Date:  2008-02-02
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  56     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-02-21     Completed Date:  2008-04-18     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1180-3     Citation Subset:  IM    
Affiliation:
Department of Food Science and Technology, Kyungpook National University, Daegu, Korea.
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MeSH Terms
Descriptor/Qualifier:
Actinidia*
Food Analysis
Food Irradiation*
Fruit / chemistry*
Gamma Rays
Hot Temperature
Light
Luminescent Measurements / methods*
Reproducibility of Results
Sensitivity and Specificity
Time Factors

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


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