Journal Article Thermal isomerization pre-treatment to improve lycopene extraction from tomato pulp

Honda, Masaki  ,  Watanabe, Yo  ,  Murakami, Kazuya  ,  Takemura, Ryota  ,  Fukaya, Tetsuya  ,  Diono, Wahyu  ,  Kanda, Hideki  ,  Goto, Motonobu

86pp.69 - 75 , 2017-12 , Elsevier
ISSN:0023-6438
Description
The effect of thermal Z-isomerization pre-treatment on lycopene extraction from dried tomato pulp byorganic solvents and supercritical carbon dioxide (SC-CO2) was evaluated. Although total Z-isomercontent of lycopene in fresh tomato pulp was only 6.1%, it increased by thermal treatment at 120 and150 C for 1 h to 10.0% and 56.2%, respectively. Furthermore, by adding 1 g/100 g of olive oil to the pulp,the thermal Z-isomerization efficiencies of lycopene at 120 and 150 C for 1 h improved significantly suchthat the total Z-isomer contents were 30.4% and 75.7%. After freeze-drying of the thermal treated tomatopulp, lycopene was extracted by ethanol, ethyl acetate, and SC-CO2. When any solvents were used for theextraction, lycopene recovery increased according to the Z-isomer content of dried tomato pulp, e.g. inthe case that ethanol extraction was conducted from the pulp containing 6.1%, 30.4%, and 75.7% Z-isomercontent of lycopene, lycopene recoveries were 4.3%, 28.1%, and 75.9%, respectively. These results stronglyindicated that Z-isomers of lycopene are more soluble in solvents than the all-E-isomer.
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