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J Agric Food Chem. 2015 Apr 22;63(15):3970-9. doi: 10.1021/acs.jafc.5b00509. Epub 2015 Apr 7.

Carotene reactivity in pink grapefruit juice elucidated from model systems and multiresponse modeling.

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†Montpellier SupAgro, UMR95 QualiSud, 1101 av. Agropolis, B.P. 5098, F-34093 Montpellier cedex 5, France.
‡CIRAD, UMR95 QualiSud, 73 av. J.F. Breton, TA B-95/16, F-34398 Montpellier cedex 5, France.
§Laboratoire de Biomathématique, Biophysique, Biochimie, et Scientométrie, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, 06000 Bejaia, Algeria.


This study was carried out to assess the impact of pink grapefruit juice composition and structure on the degradation kinetics of lycopene and β-carotene using model systems and multiresponse modeling. Carotenes were heated at four temperatures in their native matrix (juice) or were extracted and incorporated in water/ethanol emulsion systems formulated with or without ascorbic acid or naringin. Kinetic analysis showed that the rate constants and activation energy were lower for lycopene than for β-carotene in the juice, while this trend was inversed in the model system. Multiresponse modeling was used to analyze the role of ascorbic acid and naringin in carotene degradation. Ascorbic acid had a very low impact, while naringin significantly increased the carotene degradation and isomerization rates. We concluded that lycopene was more sensitive to thermal degradation and phytochemical interactions than β-carotene, but this behavior was masked in the fruit juice matrix by better structural protection.


ascorbic acid; citrus fruit; kinetic; lycopene; naringin; β-carotene

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