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UV-induced oxidation of ascorbic acid in a model juice system: Identification of degradation products.
MedLine Citation:
PMID:  21699245     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Degradation products of ultraviolet (UV-C, 254 nm) treated ascorbic acid are reported. Analysis by high performance liquid chromatography-mass spectroscopy (HPLC-MS) demonstrated increased degradation of ascorbic acid above untreated controls as dehydroascorbic acid (DHA) and 2, 3-diketogulonic acid (DKGA) levels increased. Electron spin resonance (ESR) spectroscopy studies demonstrated that ascorbyl radical formation occurs simultaneously with ascorbic acid degradation. Consistent with a previous study in which UV treatments were shown to accelerate dark storage degradation, ascorbyl radicals continued to form for up to 200 minutes after an initial UV treatment. Results from this study suggest that the mechanism for UV induced degradation is the same as the general mechanism for metal catalyzed oxidation of AA in juice.
Authors:
Rohan V Tikekar; Ramaswamy C Anantheswaran; Ryan J Elias; Luke F Laborde
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-6-24
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-6-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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