Thermal isomerization pre-treatment to improve lycopene extraction from tomato pulp. (December 2017)

• Record Type: Journal Article
• Authors: Honda, Masaki; Watanabe, Yo; Murakami, Kazuya; Takemura, Ryota; Fukaya, Tetsuya; Wahyudiono, ; Kanda, Hideki; Goto, Motonobu
• Is Part Of: Lebensmittel-Wissenschaft + Technologie =. Volume 86(2017)
• Page Start: 69
• Page End: 75
• Publication Date: 2017-12
• Subjects: Carotenoid -- E/Z isomerization -- Separation -- Supercritical CO2 -- Solubility; Food industry and trade -- Periodicals; Food -- Composition -- Periodicals; Microbiology -- Periodicals; Nutrition -- Periodicals; 664.005
• DOI: 10.1016/j.lwt.2017.07.046
• Languages: English
• ISSNs: 0023-6438

Abstract

Abstract: The effect of thermal Z -isomerization pre-treatment on lycopene extraction from dried tomato pulp by organic solvents and supercritical carbon dioxide (SC-CO2 ) was evaluated. Although total Z -isomer content of lycopene in fresh tomato pulp was only 6.1%, it increased by thermal treatment at 120 and 150 °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 such that the total Z -isomer contents were 30.4% and 75.7%. After freeze-drying of the thermal treated tomato pulp, lycopene was extracted by ethanol, ethyl acetate, and SC-CO2 . When any solvents were used for the extraction, lycopene recovery increased according to the Z -isomer content of dried tomato pulp, e.g. in the case that ethanol extraction was conducted from the pulp containing 6.1%, 30.4%, and 75.7% Z -isomer content of lycopene, lycopene recoveries were 4.3%, 28.1%, and 75.9%, respectively. These results strongly indicated that Z -isomers of lycopene are more soluble in solvents than the all- E -isomer. Highlights: The effect of the Z -isomer content on lycopene extraction was investigated. Lycopene was extracted from tomato pulp with organic solvents and supercritical CO2 . The Z -isomer content of tomato pulp was improved by heat treatment with olive oil. Lycopene recovery was improved as an increase in the Z -isomer content of tomato pulp.