ORGN 504 |
| It has been suggested that cis-lycopene isomers may be more bioavailable than their all-trans parent structure, which triggers the efforts to promote isomerization of lycopene from trans to cis form. The purpose of this work was to investigate the possibility of using photochemistry to obtain the high percentage of cis-lycopene isomers from all-trans lycopene. The extents of lycopene isomerization were compared in detail under different irradiation conditions, and the highest percentage of the cis-lycopene isomers up to 72.13% of the total lycopene was achieved by direct irradiation of all-trans lycopene in hexane at room temperature with >283 nm light. The mechanism of the photoisomerization was proposed via the triplet state of all-trans lycopene. Data obtained implied that photoisomerization is a more efficient method for increasing the percentage of cis-lycopene isomers than the food processing and the thermal treatment of foods. |
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Physical Organic Chemistry, Metal-Mediated Reactions, Asymmetric Reactions and Syntheses
8:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Organic Chemistry |