Journal articles
Isomerization and increase in the antioxidant properties of lycopene from Momordica cochinchinensis (gac) by moderate heat treatment with UV–Vis spectra as a marker
Abstract : Momordica cochinchinensis (gac) is a plant rich in lycopene. This pigment tends to solubilize in oil and get damaged during extraction. The impact of heating on cis-isomerization of oil-free lycopene in hexane was studied at 50 and 80°C during 240min with UV-Vis spectrometry, DAD-HPLC and TEAC test. The initial all-trans-form isomerized to the 13-cis isomer more rapidly at 80°C. After this treatment, 16% of the lycopene compounds were in the 9-cis-form. This isomer triggered an increase in the antioxidant properties which was detectable from concentrations above 9% and resulted in a change from 2.4 to 3.7μmol Trolox equivalent. It is thus possible to increase the bioactivity of lycopene samples by controlling heating. The evolution of ratios calculated from the global UV-Vis spectrum was representative of cis-isomerization and spectrometry can thus be a simple way to evaluate the state of isomerization of lycopene solutions.
https://hal-agrosup-dijon.archives-ouvertes.fr/hal-02401943
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Submitted on : Tuesday, December 10, 2019 - 11:39:14 AM
Last modification on : Tuesday, June 9, 2020 - 2:42:03 PM
Contributor : Admin Agrosupdijon <>
Submitted on : Tuesday, December 10, 2019 - 11:39:14 AM
Last modification on : Tuesday, June 9, 2020 - 2:42:03 PM