Document Detail

Photosensitized E/Z Isomerization of (all-E)-Lycopene Aiming at Practical Applications.
MedLine Citation:
PMID:  25387362     Owner:  NLM     Status:  Publisher    
Photoisomerization of (all-E)-lycopene to the corresponding Z-isomers was investigated under visible to middle-infrared light irradiation in the presence of several sensitizers, including edible ones. Highly purified (all-E)-lycopene from tomato paste was isomerized to Z-isomers to the extent of 46.4-57.4% after irradiation with the sensitizers for 60 min in acetone, in which a thermodynamically-stable isomer of (5Z)-lycopene was predominantly generated, while kinetically-preferable (9Z)- and (13Z)-lycopene were dominant without sensitizer. Examination of the time course of photoisomerization demonstrated that the highest isomerization efficiency (80.4%) was attained using erythrosine as the sensitizer under 480-600 nm light irradiation in hexane for 60 min, a protocol which successfully suppressed the degradation of lycopene. (5Z)-Lycopene, reported as a more bioavailable isomer, was again predominantly produced with erythrosine and rose bengal in each solvent.
Masaki Honda; Haruyuki Igami; Takahiro Kawana; Kento Hayashi; Munenori Takehara; Yoshinori Inoue; Chitoshi Kitamura
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-11
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-11     Completed Date:  -     Revised Date:  2014-11-12    
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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